獲取window的三種方式（最后一種最靠譜）
UIWindow *window = self.view.window ;
UIWindow *window = [UIApplication sharedApplication].keyWindow;
UIWindow *window = [[UIApplication sharedApplication].windows lastObject];
簡述:宏定義的后面沒有符號
0.0.Block的使用
(1) 方法調用block
1.在.h里面(建立吧bock)和設置block的方法
typedef void(^BLOCK)(NSString *name);
-(void)setBlock:(BLOCK)block;(在.m屬性需要實現)
2.在.m里面進行實現block方法和屬性的轉換
先利用BLOCK設置一個屬性 BLOCK valueBlock;
-(void)setBlock:(BLOCK)block
{
valueBlock = block;
}
3.在點擊的調用的方法里面進行調用
valueBlock(這里放一個字符串傳到外面);
4.在外面調用
[類的對象 setBlock:^(NSString *name) {
這里進行執行block這個方法
}];
(2) 屬性調用block
1.在.h里面設置2個字符串
@property(nonatomic,strong) void(^guwen)(NSString *paGe,NSString *name);
2.在.m里面點擊調用
if (self.guwen) {
self.guwen(pageNumber,self.nameLabel.text);
}
3.在外面把值取出來
利用這個類的對象進行調用
累的對象.guwen = ^(NSString *paGe,NSString *name){
在此進行調用傳值
};
0.Profile文件的設置
platform :ios,’7.0’
target “JLCardAnimation” do
pod 'AFNetworking', '~> 3.1.0'
pod 'MJExtension', '~> 3.0.13'
pod 'SDWebImage', '~> 3.8.1'
end
1.尺寸的宏定義
寬高的設置
#define WIDTH [UIScreen mainScreen].bounds.size.width
#define HEIGHT [UIScreen mainScreen].bounds.size.height
尺寸的設置
#define iPhone5AndEarlyDevice (([[UIScreen mainScreen] bounds].size.height*[[UIScreen mainScreen] bounds].size.width <= 320*568)?YES:NO)
#define Iphone6 (([[UIScreen mainScreen] bounds].size.height*[[UIScreen mainScreen] bounds].size.width <= 375*667)?YES:NO)
2.顏色的宏定義
//RGB顏色
#define CWColor(r,g,b) [UIColor colorWithRed:(r)/255.0 green:(g)/255.0 blue:(b)/255.0 alpha:1.0]
//隨機色(和上面的保持 一致)
#define CWRandomColor CWColor(arc4random_uniform(256),arc4random_uniform(256),arc4random_uniform(256))
自定義隨機色
#define CWRandomColor [UIColor colorWithRed:arc4random_uniform(256)/255.0 green:arc4random_uniform(256)/255.0 blue:arc4random_uniform(256)/255.0 alpha:1.0]
3.開發模式(名字自己起)
#ifdef DEBUG //處于開發階段才打印(調試)
#define CWLog(...) NSLog(__VA_ARGS__)
#else //處于發布階段(沒有輸出)(發布)
#define CWLog(...)
#endif
4.NSUserDefaults取值,存值
//取值
#define UserDefaultObject(A) [[NSUserDefaults standardUserDefaults]objectForKey:A]
//存值(可變的值不可以存)
#define UserDefaultSetValue(B,C) [[NSUserDefaults standardUserDefaults]setObject:B forKey:C]
//存BOOL值
#define UserDefaultBool(D,E) [[NSUserDefaults standardUserDefaults]setBool:D forKey:E]
5.弱引用
__weak typeof(self) weakSelf = self;
/*
弱引用
*/
#define STWeakSelf __weak typeof(self) weakSelf = self;
6.判斷版本是ios7以后版本
#define IOS_CURRENT_VERSION_IOS7 ([[UIDevice currentDevice].systemVersion floatValue] < 7.0 ? NO : YES)
7.打印函數，可以打印所在的函數，行數，以及你要打印的值
#define DLog(fmt, ...) NSLog((@"%s [Line %d] " fmt), __PRETTY_FUNCTION__, __LINE__, ##__VA_ARGS__);
NSLog(@"==1==%s 2==[Line %d] 3==%@", __PRETTY_FUNCTION__, __LINE__,string);
8.cell高度根據文本來確定(注意字體的大小和外面的保持一致)
CGFloat height =[@"文字的內容" boundingRectWithSize:CGSizeMake([UIScreen mainScreen].bounds.size.width-20, CGFLOAT_MAX) options:NSStringDrawingUsesLineFragmentOrigin attributes:[NSDictionary dictionaryWithObject:[UIFont systemFontOfSize:11] forKey:NSFontAttributeName] context:nil].size.height;
9.請求,上拉,下拉刷新
一般都有頁碼和數組
NSArray *tempArray;
NSMutableArray *dataArray;
@property(nonatomic,assign) int p;
-(void)refreshData
{
self.tableView.mj_header= [MJRefreshNormalHeader headerWithRefreshingBlock:^{
self.p = 1;
dataArray = [[NSMutableArray alloc]init];
[HUD showLoadingHUDWithText:@"加載中..." inView:self.view];
//調用網絡請求的方法
[self request:1];
}];
self.tableView.mj_footer = [MJRefreshAutoFooter footerWithRefreshingBlock:^{
self.p ++;
[HUD showLoadingHUDWithText:@"加載中..." inView:self.view];
//調用網絡請求的方法
[self request:self.p];
}];
}
10.網絡請求
-(void)request:(int)pp
{
self.title = @"酒店";
#define DFTurl @"http://192.168.80.254"
NSString *url = [NSString stringWithFormat:@"%@/jiekou/index.php?g=home&m=index&a=jiudian&p=%d",DFTurl,pp];
dispatch_async(dispatch_get_global_queue(0, 0), ^{
/*
網絡數據的請求
*/
[[SXHTTPEngine shareManager]POST:url params:nil success:^(id responseObject) {
DFTLog(@"====%@",responseObject);
tempArray = responseObject[@"data"];
tempArray = [HostelHomeModel mj_objectArrayWithKeyValuesArray:tempArray];
[dataArray addObjectsFromArray:tempArray];
[HUD hideHUD];
/*
刷新主線程
*/
dispatch_async(dispatch_get_main_queue(), ^{
[self.tableView reloadData];
/*
上拉下拉刷新的截止
*/
[self.tableView.mj_header endRefreshing];
[self.tableView.mj_footer endRefreshing];
});
} failure:^(NSError *error) {
DFTLog(@"加載失敗");
/*
上拉下拉刷新的截止
*/
[self.tableView.mj_header endRefreshing];
[self.tableView.mj_footer endRefreshing];
[HUD showLoadingHUDWithText:@"加載失敗"];
[HUD hideHUD];
}];
});
}
11. 設置導航欄文字的顏色以及文字大小（如導航的背景顏色，以及導航欄中間字體的顏色）
/*
設置導航欄文字的顏色以及文字大小（如導航的背景顏色，以及導航欄中間字體的顏色）
[UINavigationBar appearance];
設置Item的樣式
[UIBarButtonItem appearance];
*/
//在第一次使用調用一次
+(void)initialize
{
//設置整個項目所有item的主題樣式（）
UIBarButtonItem *item = [UIBarButtonItem appearance];
//設置普通狀態的字體顏色和大小
[item setTitleTextAttributes:@{NSForegroundColorAttributeName:CWColor(123, 123, 123),NSFontAttributeName:[UIFont systemFontOfSize:20]} forState:UIControlStateNormal];
//設置點擊的時候顏色和大小
[item setTitleTextAttributes:@{NSForegroundColorAttributeName:CWColor(252, 108, 8),NSFontAttributeName:[UIFont systemFontOfSize:20]} forState:UIControlStateSelected];
}
導航欄上button圖片防止被渲染
UIImage *img = [[UIImage imageNamed:@"icon_cog"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
//寬度為負數的固定間距的系統item
UIBarButtonItem *rightNegativeSpacer = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];
[rightNegativeSpacer setWidth:-15];
UIBarButtonItem *rightBtnItem1 = [[UIBarButtonItem alloc]initWithImage:img style:UIBarButtonItemStylePlain target:self action:@selector(rightButtonItemClicked:)];
UIBarButtonItem *rightBtnItem2 = [[UIBarButtonItem alloc]initWithImage:img style:UIBarButtonItemStylePlain target:self action:@selector(rightButtonItemClicked:)];
self.navigationItem.rightBarButtonItems = @[rightNegativeSpacer,rightBtnItem1,rightBtnItem2];
12 NSData 轉化我 string
/*
1.把 NSData 轉化我 string
*/
NSString *string = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];
/*
2.把string 轉化我 NSData
*/
NSData *data = [respondString dataUsingEncoding:NSUTF8StringEncoding]
//NSString轉化為NSNumber
NSString *string = @"9000";
NSNumber *number = @([string integerValue]);
NSLog(@"number=%@",number);
//NSNumber轉化為NSString
NSString *string1 = [NSString stringWithFormat:@"%@",number];
NSLog(@"string1=%@",string1);
13主線程刷新
<1>.GCD
dispatch_async(dispatch_get_main_queue(), ^{
});
<2>.NSOperation
[[NSOperationQueue mainQueue]addOperationWithBlock:^{
}];
13.改變圖片的大小
我們需要傳UIImage 和 CGSize 返回的還是UIImage
- (UIImage *)scaleToSize:(UIImage *)img size:(CGSize)newsize{
// 創建一個bitmap的context
// 并把它設置成為當前正在使用的context
UIGraphicsBeginImageContext(newsize);
// 繪制改變大小的圖片
[img drawInRect:CGRectMake(0, 0, newsize.width, newsize.height)];
// 從當前context中創建一個改變大小后的圖片
UIImage* scaledImage = UIGraphicsGetImageFromCurrentImageContext();
// 使當前的context出堆棧
UIGraphicsEndImageContext();
// 返回新的改變大小后的圖片
return scaledImage;
}
14.有關block的使用
這僅僅是調用的展示
@property(strong,nonatomic)void(^agriculturalBtnClick)();
@property(strong,nonatomic)void(^forestryBtnClick)();
@property(strong,nonatomic)void(^AnimalBtnClick)();
-(void)homeBtnClick:(UIButton *)sender
{
switch (sender.tag) {
case 0:{
if (self.agriculturalBtnClick) {
self.agriculturalBtnClick();
}
}break;
case 1:{
if (self.forestryBtnClick) {
self.forestryBtnClick();
}
}break;
case 2:{
if (self.AnimalBtnClick) {
self.AnimalBtnClick();
}
}break;
}
}
/*
下面是對方法的調用(這是cell里面的調用)
*/
cell.agriculturalBtnClick = ^(){
};
cell.forestryBtnClick = ^(){
};
cell.AnimalBtnClick = ^(){
};
15.一個方法的延遲執行(2s之后執行)
[self performSelector:@selector(logInShouYe) withObject:nil afterDelay:2];
16.打電話
NSMutableString * str=[[NSMutableString alloc] initWithFormat:@"tel:%@",[user objectForKey:@"電話"]];
UIWebView * callWebview = [[UIWebView alloc] init];
[callWebview loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:str]]];
[self.view addSubview:callWebview];
17.弱引用的使用
__weak typeof(self) Wself = self;
18.UIWebView加載連接
NSURL *url = [NSURL URLWithString:@"http://www.pgyer.com/iHLM"];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
UIWebView *webView = [[UIWebView alloc]initWithFrame:[UIScreen mainScreen].bounds];
[self.view addSubview:webView];
[webView loadRequest:request];
19.按鈕的點擊方法(其實只是縮放率的改變,動畫的加載)
按鈕的點擊放大,其實改變的只是按鈕的transform(縮放率)
- 下面以一個button為例
UIButton = [UIButton buttonWithType:UIButtonTypeCustom];
self.liekBtn.frame = CGRectMake(CGRectGetMaxX(self.disLikeBtn.frame)+100 , HEIGHT*0.5, 60, 60);
[self.liekBtn setImage:[UIImage imageNamed:@"likeBtn"] forState:UIControlStateNormal];
[self.liekBtn addTarget:self action:@selector(liek) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:self.liekBtn];
-(void)liek {
[UIView animateWithDuration:0.5
animations:^{
self.liekBtn.transform = CGAffineTransformMakeScale(1.2, 1.2);
} completion:^(BOOL finished) {
self.liekBtn.transform = CGAffineTransformMakeScale(1, 1);
}];
}
3D放大
對象.transform3D = CATransform3DMakeScale(x, y, z);
20.手勢沖突的解決方式
//重寫手勢的方法 手勢會影響 cell的點擊
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
if ([NSStringFromClass([touch.view class]) isEqualToString:@"UITableViewCellContentView"])
{
return NO;
}else{
return YES;
}
}
21打電話
掛代理 <UIActionSheetDelegate>
UIAlertView * alertView2 = [[UIAlertView alloc]initWithTitle:@"全國統一客服熱線:4007-114-115" message:nil delegate:self cancelButtonTitle:@"撥打" otherButtonTitles:@"取消", nil];
[alertView2 show];
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
UIWebView*callWebview =[[UIWebView alloc] init] ;
NSURL *telURL =[NSURL URLWithString:[NSString stringWithFormat:@"tel://4007114115"]];
[callWebview loadRequest:[NSURLRequest requestWithURL:telURL]];
[self.backScrollView addSubview:callWebview];
return;
}
22.導航欄的顏色
可以設置全局,也可以單獨設置
self.navigationController.navigationBar.titleTextAttributes = @{NSForegroundColorAttributeName : [UIColor whiteColor],NSFontAttributeName : [UIFont systemFontOfSize:20]};
/顏色自己隨便設置
self.navigationController.navigationBar.barTintColor = [UIColor colorWithRed:0.101 green:0.705 blue:0.652 alpha:1.000];
23.自定義導航控制器上面的按鈕
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
//設置圖片的兩種狀態
//正常
[button setImage:[UIImage imageNamed:@"返回"] forState:UIControlStateNormal];
//選中
[button setImage:[UIImage imageNamed:@"返回"] forState:UIControlStateHighlighted];
button.frame = CGRectMake(0, 0, 30, 30);
[button addTarget:self action:@selector(back1) forControlEvents:UIControlEventTouchUpInside];
self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc]initWithCustomView:button];
24.獲取版本號
//獲取版本號
NSString *version1 = [NSBundle mainBundle].infoDictionary[@"CFBundleShortVersionString"];
25.相機問題
最近做頭像上傳功能需要使用系統相冊、相機，在調用系統相冊、相機發現是英文的系統相簿界面后標題顯示“photos”，但是手機語言已經設置顯示中文，糾結半天，最終在info.plist設置解決問題。發現在項目的info.plist里面添加Localized resources can be mixed YES（表示是否允許應用程序獲取框架庫內語言）即可解決這個問題。特此記錄下以便以后查看和別人解決問題。
26.兩種跳轉展示
- 1.中間展示(兩種寫法)
中間展示
//第一種方法
1.掛代理<UIActionSheetDelegate>
2.在點擊的地方調用
UIAlertView * alertView = [[UIAlertView alloc]initWithTitle:@"全國統一客服熱線4007-114-115" message:nil delegate:self cancelButtonTitle:@"撥打" otherButtonTitles:@"取消", nil];
[alertView show];
3.方法調用
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
if (buttonIndex == 0)
{
NSLog(@"撥打");
}else if (buttonIndex == 1)
{
NSLog(@"取消");
}
}
//第二種方法(方法里面直接調用:不用掛代理)
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"全國統一客服熱線4007-114-115" message:nil preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction *alertAction = [UIAlertAction actionWithTitle:@"撥打" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
NSLog(@"撥打");
}];
UIAlertAction *alertAction2 = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
NSLog(@"取消");
}];
[alertController addAction:alertAction];
[alertController addAction:alertAction2];
[self presentViewController:alertController animated:YES completion:nil];
- 2.下面展示
下面展示
//第一種方法
1.第一種掛代理<UIActionSheetDelegate>
2.在點擊的地方調用
UIActionSheet *sheet = [[UIActionSheet alloc] initWithTitle:nil delegate:self cancelButtonTitle:@"取消" destructiveButtonTitle:nil otherButtonTitles:@"從手機選擇", @"拍照", nil];
sheet.actionSheetStyle = UIBarStyleDefault;
[sheet showInView:self.view];
3.方法調用
-(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
if (buttonIndex == 0)
{
NSLog(@"我是從手機選擇");
}else if (buttonIndex == 1)
{
NSLog(@"我是拍照");
}
}
//第二種方法(方法里面直接調用:不用掛代理)
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:nil message:nil preferredStyle:UIAlertControllerStyleActionSheet];
UIAlertAction *alertAction = [UIAlertAction actionWithTitle:@"從手機選擇" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
NSLog(@"從手機選擇");
}];
UIAlertAction *alertAction1 = [UIAlertAction actionWithTitle:@"拍照" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
NSLog(@"拍照");
}];
UIAlertAction *alertAction2 = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
NSLog(@"取消");
}];
[alertController addAction:alertAction];
[alertController addAction:alertAction1];
[alertController addAction:alertAction2];
[self presentViewController:alertController animated:YES completion:nil];
27.對控件邊框的處理(如寬度,顏色)
對象(button,label...).layer.borderColor = [[UIColor blackColor] CGColor];
對象(button,label...).layer.borderWidth = 2.0f;
28.自定義導航欄標題
UILabel *titleLabel = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, 100, 44)];
titleLabel.text = @"登陸";
titleLabel.textAlignment = NSTextAlignmentCenter;
titleLabel.textColor = [UIColor blackColor];
titleLabel.font = [UIFont systemFontOfSize:15];
self.navigationItem.titleView = titleLabel;
29.靜態變量的含義
static 表示只在此文件里可以訪問(防止其他文件訪問) const防止別人去改
static NSString *const ID = @"cellID";
30.懶加載的一些知識點
懶加載里面都是用_,但是在外面使用都要用self. 這樣才能保證數據的存在性
31.切換UICollectionViewFolowLayout
CwLineLayout 是自定義的layout
if ([self.collectionView.collectionViewLayout isKindOfClass:[CwLineLayout class]]) {
[self.collectionView setCollectionViewLayout:[[UICollectionViewFlowLayout alloc]init] animated:YES];
}else
{
[self.collectionView setCollectionViewLayout:[[CwLineLayout alloc]init] animated:YES];
}
31.刪除指定item
/**
* collectionView的點擊事件
*/
-(void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
//刪除模型數據(刪除的指定item)
[self.imageArray removeObjectAtIndex:indexPath.item];
//刷新UI(這種方式比全局的好很多)
[collectionView deleteItemsAtIndexPaths:@[indexPath]];
}
32.textField.returnKeyType = UIReturnKeySend;
typedef NS_ENUM(NSInteger, UIReturnKeyType) {
UIReturnKeyDefault,
UIReturnKeyGo,//去往
UIReturnKeyGoogle,
UIReturnKeyJoin,//加入
UIReturnKeyNext,//下一步
UIReturnKeyRoute,
UIReturnKeySearch,//搜索
UIReturnKeySend,//發送
UIReturnKeyYahoo,
UIReturnKeyDone,//完成
UIReturnKeyEmergencyCall,
UIReturnKeyContinue NS_ENUM_AVAILABLE_IOS(9_0),
};
33.下一個tabBar隱藏
testViewController.hidesBottomBarWhenPushed = YES;
34. 判斷手機號碼格式是否正確，利用正則表達式驗證
+ (BOOL)isMobileNumber:(NSString *)mobileNum
{
if (mobileNum.length != 11)
{
return NO;
}
/** * 手機號碼:
* 13[0-9], 14[5,7], 15[0, 1, 2, 3, 5, 6, 7, 8, 9], 17[6, 7, 8], 18[0-9], 170[0-9]
* 移動號段: 134,135,136,137,138,139,150,151,152,157,158,159,182,183,184,187,188,147,178,1705
* 聯通號段: 130,131,132,155,156,185,186,145,176,1709
* 電信號段: 133,153,180,181,189,177,1700
*/
NSString *MOBILE = @"^1(3[0-9]|4[57]|5[0-35-9]|8[0-9]|70)\d{8}$";
/** * 中國移動：China Mobile
* 134,135,136,137,138,139,150,151,152,157,158,159,182,183,184,187,188,147,178,1705
*/
NSString *CM = @"(^1(3[4-9]|4[7]|5[0-27-9]|7[8]|8[2-478])\d{8}$)|(^1705\d{7}$)";
/** * 中國聯通：China Unicom
* 130,131,132,155,156,185,186,145,176,1709
*/
NSString *CU = @"(^1(3[0-2]|4[5]|5[56]|7[6]|8[56])\d{8}$)|(^1709\d{7}$)";
/** * 中國電信：China Telecom
* 133,153,180,181,189,177,1700
*/
NSString *CT = @"(^1(33|53|77|8[019])\d{8}$)|(^1700\d{7}$)";
NSPredicate *regextestmobile = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", MOBILE];
NSPredicate *regextestcm = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CM];
NSPredicate *regextestcu = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CU];
NSPredicate *regextestct = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CT];
if (([regextestmobile evaluateWithObject:mobileNum] == YES) || ([regextestcm evaluateWithObject:mobileNum] == YES) || ([regextestct evaluateWithObject:mobileNum] == YES) || ([regextestcu evaluateWithObject:mobileNum] == YES))
{
return YES;
}
else
{
return NO;
}
}
35. 判斷郵箱格式是否正確，利用正則表達式驗證
+ (BOOL)isAvailableEmail:(NSString *)email
{
NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}";
NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];
return [emailTest evaluateWithObject:email];
}
36. 判斷字符串中是否含有空格
+ (BOOL)isHaveSpaceInString:(NSString *)string
{
NSRange _range = [string rangeOfString:@" "];
if (_range.location != NSNotFound)
{
return YES;
}else
{
return NO;
}
}
37. 判斷字符串中是否含有中文
+ (BOOL)isHaveChineseInString:(NSString *)string
{
for(NSInteger i = 0; i < [string length]; i++)
{
int a = [string characterAtIndex:i];
if (a > 0x4e00 && a < 0x9fff)
{
return YES;
}
}
return NO;
}
38. 判斷字符串是否全部為數字
+ (BOOL)isAllNum:(NSString *)string
{
unichar c;
for (int i=0; i<string.length; i++) { c="[string characterAtIndex:i];" if (!isdigit(c)) {="" return no;="" }="" }="" return yes;="" }<="" pre=""><p>判斷是否是純數字</p><pre class="brush:js;toolbar:false">+ (BOOL)isPureInteger:(NSString *)str {
NSScanner *scanner = [NSScanner scannerWithString:str];
NSInteger val;
return [scanner scanInteger:&val] && [scanner isAtEnd];
}
39. 過濾一些特殊字符 似乎只能去除頭尾的特殊字符(不準)
+ (NSString *)filterSpecialWithString:(NSString *)string
{
// 定義一個特殊字符的集合
NSCharacterSet *set = [NSCharacterSet characterSetWithCharactersInString: @ "@／：；: ;（）?「」＂、[]{}#%-*+=_|~＜＞$?^?'@#$%^&*()_+'"];
// 過濾字符串的特殊字符
NSString *newString = [string stringByTrimmingCharactersInSet:set]; return newString;
}
40. 讓iOS應用直接退出
+ (void)backOutApp
{
UIWindow *window = [[UIApplication sharedApplication].delegate window];
[UIView animateWithDuration:1.0f animations:^{
window.alpha = 0;
} completion:^(BOOL finished)
{
exit(0);
}];
}
41 NSArray 快速求總和、最大值、最小值、平均值
+ (NSString *)caculateArray:(NSArray *)array
{
CGFloat sum = [[array valueForKeyPath:@"@sum.floatValue"] floatValue];
CGFloat avg = [[array valueForKeyPath:@"@avg.floatValue"] floatValue];
CGFloat max =[[array valueForKeyPath:@"@max.floatValue"] floatValue];
CGFloat min =[[array valueForKeyPath:@"@min.floatValue"] floatValue];
NSLog(@"%fn%fn%fn%f",sum,avg,max,min);
return [NSString stringWithFormat:@"%f",sum];
}
42.生成八位隨機字符串(一般是RSA加密或者DES加密使用)
- (NSString *)shuffledAlphabet {
NSString *alphabet = @"ABCDEFGHIJKLMNOPQRSTUVWXYZ";
// Get the characters into a C array for efficient shuffling
NSUInteger numberOfCharacters = [alphabet length];
unichar *characters = calloc(numberOfCharacters, sizeof(unichar));
[alphabet getCharacters:characters range:NSMakeRange(0, numberOfCharacters)];
// Perform a Fisher-Yates shuffle
for (NSUInteger i = 0; i < numberOfCharacters; ++i) {
NSUInteger j = (arc4random_uniform((float)numberOfCharacters - i) + i);
unichar c = characters[i];
characters[i] = characters[j];
characters[j] = c;
}
// Turn the result back into a string
NSString *result = [NSString stringWithCharacters:characters length:8];
free(characters);
return result;
}
43.判斷是真機還是模擬器
#if TARGET_OS_IPHONE
//iPhone Device
#endif
#if TARGET_IPHONE_SIMULATOR
//iPhone Simulator
#endif
44.GCD 的宏定義
很多小伙伴都非常煩寫GCD的方法，所以在此定義為宏使用更加方便簡潔！如下圖
//GCD - 一次性執行
#define kDISPATCH_ONCE_BLOCK(onceBlock) static dispatch_once_t onceToken; dispatch_once(&onceToken, onceBlock);
//GCD - 在Main線程上運行
#define kDISPATCH_MAIN_THREAD(mainQueueBlock) dispatch_async(dispatch_get_main_queue(), mainQueueBlock);
//GCD - 開啟異步線程
#define kDISPATCH_GLOBAL_QUEUE_DEFAULT(globalQueueBlock) dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), globalQueueBlocl);
45.判斷當前的iPhone設備/系統版本
//判斷是否為iPhone
#define IS_IPHONE (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)
//判斷是否為iPad
#define IS_IPAD (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
//判斷是否為ipod
#define IS_IPOD ([[[UIDevice currentDevice] model] isEqualToString:@"iPod touch"])
// 判斷是否為 iPhone 5SE
#define iPhone5SE [[UIScreen mainScreen] bounds].size.width == 320.0f && [[UIScreen mainScreen] bounds].size.height == 568.0f
// 判斷是否為iPhone 6/6s
#define iPhone6_6s [[UIScreen mainScreen] bounds].size.width == 375.0f && [[UIScreen mainScreen] bounds].size.height == 667.0f
// 判斷是否為iPhone 6Plus/6sPlus
#define iPhone6Plus_6sPlus [[UIScreen mainScreen] bounds].size.width == 414.0f && [[UIScreen mainScreen] bounds].size.height == 736.0f
//獲取系統版本
#define IOS_SYSTEM_VERSION [[[UIDevice currentDevice] systemVersion] floatValue]
//判斷 iOS 8 或更高的系統版本
#define IOS_VERSION_8_OR_LATER (([[[UIDevice currentDevice] systemVersion] floatValue] >=8.0)? (YES):(NO))
46.獲取當前語言
#define LRCurrentLanguage ([[NSLocale preferredLanguages] objectAtIndex:0])
47.“Info.plist”中將要使用的URL Schemes列為白名單
當你的應用在iOS 9中需要使用 QQ/QQ空間/支付寶/微信SDK 的相關能力（分享、收藏、支付、登錄等）時，需要在“Info.plist”里增加如下代碼：
<key>LSApplicationQueriesSchemes</key>
<array>
<!-- 微信 URL Scheme 白名單-->
<string>wechat</string>
<string>weixin</string>
<!-- 新浪微博 URL Scheme 白名單-->
<string>sinaweibohd</string>
<string>sinaweibo</string>
<string>sinaweibosso</string>
<string>weibosdk</string>
<string>weibosdk2.5</string>
<!-- QQ、Qzone URL Scheme 白名單-->
<string>mqqapi</string>
<string>mqq</string>
<string>mqqOpensdkSSoLogin</string>
<string>mqqconnect</string>
<string>mqqopensdkdataline</string>
<string>mqqopensdkgrouptribeshare</string>
<string>mqqopensdkfriend</string>
<string>mqqopensdkapi</string>
<string>mqqopensdkapiV2</string>
<string>mqqopensdkapiV3</string>
<string>mqzoneopensdk</string>
<string>wtloginmqq</string>
<string>wtloginmqq2</string>
<string>mqqwpa</string>
<string>mqzone</string>
<string>mqzonev2</string>
<string>mqzoneshare</string>
<string>wtloginqzone</string>
<string>mqzonewx</string>
<string>mqzoneopensdkapiV2</string>
<string>mqzoneopensdkapi19</string>
<string>mqzoneopensdkapi</string>
<string>mqzoneopensdk</string>
<!-- 支付寶 URL Scheme 白名單-->
<string>alipay</string>
<string>alipayshare</string>
</array>
48.將秒轉化為時間字符串
秒數
float currentPlayTime = 64;
//將秒轉化為時間字符串
NSString *currentTimeStr = [self convertDuraion:currentPlayTime];
- (NSString *)convertDuraion:(float)duraion{
NSDate *date = [NSDate dateWithTimeIntervalSince1970:duraion];
NSDateFormatter *dateFormate = [[NSDateFormatter alloc]init];
dateFormate.dateFormat = @"mm:ss";
return [dateFormate stringFromDate:date];
}
49.有關字符串
NSString *string1 = @"0123456789";
NSRange range1 = NSMakeRange(1, 4);//NSMakeRange這個函數的作用是從第0位開始計算，長度為4
NSLog(@"從第1個字符開始，長度為4的字符串是：%@",[string1 substringWithRange:range1]);
NSLog(@"抽取從頭開始到第4個字符：%@",[string1 substringToIndex:4]);
NSLog(@"抽取從第6個字符開始到末尾：%@",[string1 substringFromIndex:6]);
NSString *string2 = @"wo shi xiao bai zhu";
NSRange range2 = [string2 rangeOfString:@"bai"];
if (range2.length > 0) {
NSLog(@"{字符串中“bai”的位置,長度}==%@",NSStringFromRange(range2));
}
//判斷在一串字符串中是否找到某個字符串
NSRange range3 = [string2 rangeOfString:@"zhu"];
if (range3.location != NSNotFound) {
NSLog(@"找到了@“zhu”這個字符串！");
}
else
{
NSLog(@"沒找到！");
}
50.交換兩個值(異或)
交換值
51.角度轉弧度
宏定義: #define angle2radion(angle) ((angle) / 180.0 * M_PI)
52.獲取當前的系統時間(以日歷表為例)
//獲取當前日歷對象
NSCalendar *calendar =[NSCalendar currentCalendar];
//獲取日期的組件,年月日,時分秒
//components: 需要獲取日期組件
//formDate:獲取哪個日期組件
//經驗:以后枚舉中有移位運算符(<<),一般來說我們就可以用 | :"并" 的方式
NSDateComponents *dateComponents = [calendar components:NSCalendarUnitSecond | NSCalendarUnitMinute | NSCalendarUnitHour | NSCalendarUnitDay | NSCalendarUnitMonth | NSCalendarUnitYear fromDate:[NSDate date]];
NSLog(@"小時==%ld",dateComponents.hour);
NSLog(@"分鐘==%ld",dateComponents.minute);
NSLog(@"秒==%ld",dateComponents.second);
53.點轉化為對象
[NSValue valueWithCGPoint:CGPointMake(arc4random_uniform(500), arc4random_uniform(500))];
54.隱藏tabBar
控制器對象.hidesBottomBarWhenPushed = YES;(比較好)
55.刷新指定section或者row
//一個section刷新
NSIndexSet *indexSet=[[NSIndexSet alloc]initWithIndex:indexPath.section];
[_tableView reloadSections:indexSet withRowAnimation:UITableViewRowAnimationAutomatic];
//一個cell刷新
NSIndexPath *indexPath1=[NSIndexPath indexPathForRow:3 inSection:0];
[tableView reloadRowsAtIndexPaths:[NSArray arrayWithObjects:indexPath1,nil] withRowAnimation:UITableViewRowAnimationNone];
56. 遍歷字典
NSDictionary *dict = [NSDictionary new];
[dict enumerateKeysAndObjectsUsingBlock:^(id _Nonnull key, id _Nonnull obj, BOOL * _Nonnull stop) {
// key 是鍵
// obj 是值
}];
57. NSTimer定時器
創建定時器
NSTimer * timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(click1) userInfo:nil repeats:YES];
暫停
[timer setFireDate:[NSDate distantFuture]];
繼續
[timer setFireDate:[NSDate date]];
關閉定時器
[timer invalidate];
58.兩張圖片的合成
/**
* 3.將兩個圖片合成
*/
dispatch_group_notify(group, queue, ^{
/**
* 開啟新的圖形上下文
*/
UIGraphicsBeginImageContext(CGSizeMake(200, 200));
//繪制圖片
[self.image1 drawInRect:CGRectMake(0, 0, 200, 100)];
//繪制圖片
[self.image2 drawInRect:CGRectMake(0, 100, 200, 100)];
/**
* 取得上下文里面的圖片
*/
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
/**
* 結束上下文
*/
UIGraphicsEndImageContext();
/**
* 4.進入主隊列加載合成的圖片
*/
dispatch_async(dispatch_get_main_queue(), ^{
self.imageView.image = image;
});
59沙盒路徑
//獲取整個程序所在目錄
NSString *homePath=NSHomeDirectory();
NSLog(@"%@",homePath);
//獲取.app文件目錄
NSString *appPath=[[NSBundle mainBundle]bundlePath];
NSLog(@"%@",appPath);
//Documents目錄
NSArray *arr1=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSLog(@"%@",[arr1 objectAtIndex:0]);
//Library目錄
NSArray *arr2=NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES);
NSLog(@"%@",[arr2 objectAtIndex:0]);
//Caches目錄，在Library下面
NSArray *arr3=NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
NSLog(@"%@",[arr3 objectAtIndex:0]);
//tmp目錄
NSString *tmpPath=NSTemporaryDirectory();
NSLog(@"%@",tmpPath);
//用整個程序目錄加上tmp就拼湊出tmp目錄，其他目錄都可這樣完成
NSString *tmpPath_1=[homePath stringByAppendingPathComponent:@"tmp"];
NSLog(@"%@",tmpPath_1);
60.幾個常用的正則表達式
//郵箱
+ (BOOL) validateEmail:(NSString *)email
{
NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];
return [emailTest evaluateWithObject:email];
}
//手機號碼驗證
+ (BOOL) validateMobile:(NSString *)mobile
{
//手機號以13， 15，18開頭，八個 \d 數字字符
NSString *phoneRegex = @"^((13[0-9])|(15[^4,\\D])|(18[0,0-9]))\\d{8}$";
NSPredicate *phoneTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",phoneRegex];
return [phoneTest evaluateWithObject:mobile];
}
//車牌號驗證
+ (BOOL) validateCarNo:(NSString *)carNo
{
NSString *carRegex = @"^[\u4e00-\u9fa5]{1}[a-zA-Z]{1}[a-zA-Z_0-9]{4}[a-zA-Z_0-9_\u4e00-\u9fa5]$";
NSPredicate *carTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",carRegex];
NSLog(@"carTest is %@",carTest);
return [carTest evaluateWithObject:carNo];
}
//車型
+ (BOOL) validateCarType:(NSString *)CarType
{
NSString *CarTypeRegex = @"^[\u4E00-\u9FFF]+$";
NSPredicate *carTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",CarTypeRegex];
return [carTest evaluateWithObject:CarType];
}
//用戶名
+ (BOOL) validateUserName:(NSString *)name
{
NSString *userNameRegex = @"^[A-Za-z0-9]{6,20}+$";
NSPredicate *userNamePredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",userNameRegex];
BOOL B = [userNamePredicate evaluateWithObject:name];
return B;
}
//密碼
+ (BOOL) validatePassword:(NSString *)passWord
{
NSString *passWordRegex = @"^[a-zA-Z0-9]{6,20}+$";
NSPredicate *passWordPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",passWordRegex];
return [passWordPredicate evaluateWithObject:passWord];
}
//以下驗證不計算長度
//1、驗證字符串
- (BOOL)validateNickname:(NSString *)nickname {
// 不包含特殊字符
// 特殊字符包含`、-、=、\、[、]、;、'、,、.、/、~、!、@、#、$、%、^、&、*、(、)、_、+、|、?、>、<、"、:、{、}
NSString *nicknameRegex = @".*[-`=\\\[\\];',./~!@#$%^&*()_+|{}:\"<>?]+.*";
NSPredicate *nicknamePredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", nicknameRegex];
return ![nicknamePredicate evaluateWithObject:nickname];
}
//2、驗證密碼
- (BOOL)validatePassword:(NSString *)password {
// 特殊字符包含`、-、=、\、[、]、;、'、,、.、/、~、!、@、#、$、%、^、&、*、(、)、_、+、|、?、>、<、"、:、{、}
// 必須包含數字和字母，可以包含上述特殊字符。
// 依次為（如果包含特殊字符）
// 數字 字母 特殊
// 字母 數字 特殊
// 數字 特殊 字母
// 字母 特殊 數字
// 特殊 數字 字母
// 特殊 字母 數字
NSString *passWordRegex = @"(\\d+[a-zA-Z]+[-`=\\\[\\];',./~!@#$%^&*()_+|{}:\"<>?]*)|([a-zA-Z]+\\d+[-`=\\\[\\];',./~!@#$%^&*()_+|{}:\"<>?]*)|(\\d+[-`=\\\[\\];',./~!@#$%^&*()_+|{}:\"<>?]*[a-zA-Z]+)|([a-zA-Z]+[-`=\\\[\\];',./~!@#$%^&*()_+|{}:\"<>?]*\\d+)|([-`=\\\[\\];',./~!@#$%^&*()_+|{}:\"<>?]*\\d+[a-zA-Z]+)|([-`=\\\[\\];',./~!@#$%^&*()_+|{}:\"<>?]*[a-zA-Z]+\\d+)";
NSPredicate *passWordPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", passWordRegex];
return [passWordPredicate evaluateWithObject:password];
}
//昵稱
+ (BOOL) validateNickname:(NSString *)nickname
{
NSString *nicknameRegex = @"^[\u4e00-\u9fa5]{4,8}$";
NSPredicate *passWordPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",nicknameRegex];
return [passWordPredicate evaluateWithObject:nickname];
}
//身份證號
+ (BOOL) validateIdentityCard: (NSString *)identityCard
{
BOOL flag;
if (identityCard.length <= 0) {
flag = NO;
return flag;
}
NSString *regex2 = @"^(\\d{14}|\\d{17})(\\d|[xX])$";
NSPredicate *identityCardPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex2];
return [identityCardPredicate evaluateWithObject:identityCard];
}
61.打印方式
NSLog(@"控制器名字=%s 第%d行",__PRETTY_FUNCTION__, __LINE__);
62.控制屏幕旋轉，在控制器中寫
/** 是否支持自動轉屏 */
- (BOOL)shouldAutorotate {
return YES;
}
/** 支持哪些屏幕方向 */
- (UIInterfaceOrientationMask)supportedInterfaceOrientations {
return UIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationMaskLandscapeRight;
}
/** 默認的屏幕方向（當前ViewController必須是通過模態出來的UIViewController（模態帶導航的無效）方式展現出來的，才會調用這個方法） */
- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {
return UIInterfaceOrientationLandscapeLeft | UIInterfaceOrientationLandscapeRight;
}
63.幾個常用權限判斷
if ([CLLocationManager authorizationStatus] ==kCLAuthorizationStatusDenied) {
NSLog(@"沒有定位權限");
}
AVAuthorizationStatus statusVideo = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];
if (statusVideo == AVAuthorizationStatusDenied) {
NSLog(@"沒有攝像頭權限");
}
//是否有麥克風權限
AVAuthorizationStatus statusAudio = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeAudio];
if (statusAudio == AVAuthorizationStatusDenied) {
NSLog(@"沒有錄音權限");
}
[PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {
if (status == PHAuthorizationStatusDenied) {
NSLog(@"沒有相冊權限");
}
}];
64.獲取手機和app信息
NSDictionary *infoDictionary = [[NSBundle mainBundle] infoDictionary];
CFShow(infoDictionary);
// app名稱
NSString *app_Name = [infoDictionary objectForKey:@"CFBundleDisplayName"];
// app版本
NSString *app_Version = [infoDictionary objectForKey:@"CFBundleShortVersionString"];
// app build版本
NSString *app_build = [infoDictionary objectForKey:@"CFBundleVersion"];
//手機序列號
NSString* identifierNumber = [[UIDevice currentDevice] uniqueIdentifier];
NSLog(@"手機序列號: %@",identifierNumber);
//手機別名： 用戶定義的名稱
NSString* userPhoneName = [[UIDevice currentDevice] name];
NSLog(@"手機別名: %@", userPhoneName);
//設備名稱
NSString* deviceName = [[UIDevice currentDevice] systemName];
NSLog(@"設備名稱: %@",deviceName );
//手機系統版本
NSString* phoneVersion = [[UIDevice currentDevice] systemVersion];
NSLog(@"手機系統版本: %@", phoneVersion);
//手機型號
NSString* phoneModel = [[UIDevice currentDevice] model];
NSLog(@"手機型號: %@",phoneModel );
//地方型號 （國際化區域名稱）
NSString* localPhoneModel = [[UIDevice currentDevice] localizedModel];
NSLog(@"國際化區域名稱: %@",localPhoneModel );
NSDictionary *infoDictionary = [[NSBundle mainBundle] infoDictionary];
// 當前應用名稱
NSString *appCurName = [infoDictionary objectForKey:@"CFBundleDisplayName"];
NSLog(@"當前應用名稱：%@",appCurName);
// 當前應用軟件版本 比如：1.0.1
NSString *appCurVersion = [infoDictionary objectForKey:@"CFBundleShortVersionString"];
NSLog(@"當前應用軟件版本:%@",appCurVersion);
// 當前應用版本號碼 int類型
NSString *appCurVersionNum = [infoDictionary objectForKey:@"CFBundleVersion"];
NSLog(@"當前應用版本號碼：%@",appCurVersionNum);
65.移除字符串中的空格和換行
+ (NSString *)removeSpaceAndNewline:(NSString *)str {
NSString *temp = [str stringByReplacingOccurrencesOfString:@" " withString:@""];
temp = [temp stringByReplacingOccurrencesOfString:@"\r" withString:@""];
temp = [temp stringByReplacingOccurrencesOfString:@"\n" withString:@""];
return temp;
}
66.判斷字符串中是否有空格
+ (BOOL)isBlank:(NSString *)str {
NSRange _range = [str rangeOfString:@" "];
if (_range.location != NSNotFound) {
//有空格
return YES;
} else {
//沒有空格
return NO;
}
}
67.獲取一個視頻的第一幀圖片
NSURL *url = [NSURL URLWithString:filepath];
AVURLAsset *asset1 = [[AVURLAsset alloc] initWithURL:url options:nil];
AVAssetImageGenerator *generate1 = [[AVAssetImageGenerator alloc] initWithAsset:asset1];
generate1.appliesPreferredTrackTransform = YES;
NSError *err = NULL;
CMTime time = CMTimeMake(1, 2);
CGImageRef oneRef = [generate1 copyCGImageAtTime:time actualTime:NULL error:&err];
UIImage *one = [[UIImage alloc] initWithCGImage:oneRef];
return one;
68.獲取視頻的時長
+ (NSInteger)getVideoTimeByUrlString:(NSString *)urlString {
NSURL *videoUrl = [NSURL URLWithString:urlString];
AVURLAsset *avUrl = [AVURLAsset assetWithURL:videoUrl];
CMTime time = [avUrl duration];
int seconds = ceil(time.value/time.timescale);
return seconds;
}
69.isKindOfClass和isMemberOfClass的區別
isKindOfClass可以判斷某個對象是否屬于某個類，或者這個類的子類。
isMemberOfClass更加精準，它只能判斷這個對象類型是否為這個類(不能判斷子類)
70.將tableView滾動到頂部
[tableView setContentOffset:CGPointZero animated:YES];
或者
[tableView scrollRectToVisible:CGRectMake(0, 0, 1, 1) animated:YES];
71.UILabel設置內邊距
子類化UILabel，重寫drawTextInRect方法
- (void)drawTextInRect:(CGRect)rect {
// 邊距，上左下右
UIEdgeInsets insets = {0, 5, 0, 5};
[super drawTextInRect:UIEdgeInsetsInsetRect(rect, insets)];
}
72.UILabel設置文字描邊
子類化UILabel，重寫drawTextInRect方法
- (void)drawTextInRect:(CGRect)rect
{
CGContextRef c = UIGraphicsGetCurrentContext();
// 設置描邊寬度
CGContextSetLineWidth(c, 1);
CGContextSetLineJoin(c, kCGLineJoinRound);
CGContextSetTextDrawingMode(c, kCGTextStroke);
// 描邊顏色
self.textColor = [UIColor redColor];
[super drawTextInRect:rect];
// 文本顏色
self.textColor = [UIColor yellowColor];
CGContextSetTextDrawingMode(c, kCGTextFill);
[super drawTextInRect:rect];
}
73.scrollView滾動到最下邊
CGPoint bottomOffset = CGPointMake(0, scrollView.contentSize.height - scrollView.bounds.size.height);
[scrollView setContentOffset:bottomOffset animated:YES];
74.UIView背景顏色漸變
UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 100)];
[self.view addSubview:view];
CAGradientLayer *gradient = [CAGradientLayer layer];
gradient.frame = view.bounds;
gradient.colors = [NSArray arrayWithObjects:(id)[[UIColor blackColor] CGColor], (id)[[UIColor whiteColor] CGColor], nil];
[view.layer insertSublayer:gradient atIndex:0];
75.將一個view放置在其兄弟視圖的最上面
[parentView bringSubviewToFront:yourView]
76.將一個view放置在其兄弟視圖的最下面
[parentView sendSubviewToBack:yourView]
77.讓手機震動一下
倒入框架
#import
AudioServicesPlayAlertSound(kSystemSoundID_Vibrate);
或者
AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);
78.layoutSubviews方法什么時候調用？
1、init方法不會調用
2、addSubview方法等時候會調用
3、bounds改變的時候調用
4、scrollView滾動的時候會調用scrollView的
layoutSubviews方法(所以不建議在scrollView的layoutSubviews方法中做復雜邏輯)
5、旋轉設備的時候調用
6、子視圖被移除的時候調用
79.讓UILabel在指定的地方換行
// 換行符為\n,在需要換行的地方加上這個符號即可，如
label.numberOfLines = 0;
label.text = @"此處\n換行";
80.搖一搖功能
1、打開搖一搖功能
[UIApplication sharedApplication].applicationSupportsShakeToEdit = YES;
2、讓需要搖動的控制器成為第一響應者
[self becomeFirstResponder];
3、實現以下方法
// 開始搖動
- (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event
// 取消搖動
- (void)motionCancelled:(UIEventSubtype)motion withEvent:(UIEvent *)event
// 搖動結束
- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event
81.獲取view的坐標在整個window上的位置
// v上的(0, 0)點在toView上的位置
CGPoint point = [v convertPoint:CGPointMake(0, 0) toView:[UIApplication sharedApplication].windows.lastObject];
或者
CGPoint point = [v.superview convertPoint:v.frame.origin toView:[UIApplication sharedApplication].windows.lastObject];
82.提交App Store審核程序限制
您的應用程序的未壓縮大小必須小于4GB。每個Mach-O可執行文件（例如app_name.app/app_name）不能超過這些限制：
對于MinimumOSVersion小于7.0的應用程序：TEXT二進制文件中所有部分的總數最多為80 MB 。
對于MinimumOSVersion7.x到8.x的應用程序：TEXT對于二進制文件中每個體系結構片段的每個片段，最大為60 MB 。
對于MinimumOSVersion9.0或更高版本的應用程序：__TEXT二進制文件中所有部分的總數最多為500 MB 。參閱：iTunes Connect開發者指南
83.修改UISegmentedControl的字體大小
[segment setTitleTextAttributes:@{NSFontAttributeName : [UIFont systemFontOfSize:15.0f]} forState:UIControlStateNormal];
84.在非ViewController的地方彈出UIAlertController對話框
// 最好抽成一個分類
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"Title" message:@"message" preferredStyle:UIAlertControllerStyleAlert];
id rootViewController = [UIApplication sharedApplication].delegate.window.rootViewController;
If([rootViewController isKindOfClass:[UINavigationController class]])
{
rootViewController = ((UINavigationController *)rootViewController).viewControllers.firstObject;
}
if([rootViewController isKindOfClass:[UITabBarController class]])
{
rootViewController = ((UITabBarController *)rootViewController).selectedViewController;
}
[rootViewController presentViewController:alertController animated:YES completion:nil];
85.獲取一個view所屬的控制器
// view分類方法
- (UIViewController *)belongViewController {
for (UIView *next = [self superview]; next; next = next.superview) {
UIResponder* nextResponder = [next nextResponder];
if ([nextResponder isKindOfClass:[UIViewController class]]) {
return (UIViewController *)nextResponder;
}
}
return nil;
}
86.UIImage和base64互轉
// view分類方法
- (NSString *)encodeToBase64String:(UIImage *)image {
return [UIImagePNGRepresentation(image) base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];
}
- (UIImage *)decodeBase64ToImage:(NSString *)strEncodeData {
NSData *data = [[NSData alloc]initWithBase64EncodedString:strEncodeData options:NSDataBase64DecodingIgnoreUnknownCharacters];
return [UIImage imageWithData:data];
}
87.UIWebView設置背景透明
[webView setBackgroundColor:[UIColor clearColor]];
[webView setOpaque:NO];
88.判斷NSDate是不是今天
NSDateComponents *otherDay = [[NSCalendar currentCalendar] components:NSCalendarUnitEra | NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay fromDate:aDate];
NSDateComponents *today = [[NSCalendar currentCalendar] components:NSCalendarUnitEra | NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay fromDate:[NSDate date]];
if([today day] == [otherDay day] && [today month] == [otherDay month] &&[today year] == [otherDay year] && [today era] == [otherDay era]) {
// 是今天
}
89.設置tableView分割線顏色
[self.tableView setSeparatorColor:[UIColor myColor]];
90.設置屏幕方向
[[UIDevice currentDevice] setValue:@(UIInterfaceOrientationLandscapeLeft) forKey:@"orientation"];
91.UITextView中打開或禁用復制，剪切，選擇，全選等功能
// 繼承UITextView重寫這個方法
- (BOOL)canPerformAction:(SEL)action withSender:(id)sender
{
// 返回NO為禁用，YES為開啟
// 粘貼
if (action == @selector(paste:)) return NO;
// 剪切
if (action == @selector(cut:)) return NO;
// 復制
if (action == @selector(copy:)) return NO;
// 選擇
if (action == @selector(select:)) return NO;
// 選中全部
if (action == @selector(selectAll:)) return NO;
// 刪
if (action == @selector(delete:)) return NO;
// 分享
if (action == @selector(share)) return NO;
return [super canPerformAction:action withSender:sender];
}
92.屏幕截圖
/**
* @brief 屏幕截圖
*/
+ (UIImage *)screenShotWithView:(UIView *)v;
+ (UIImage *)screenShotWithView:(UIView *)v;
{
UIGraphicsBeginImageContext(v.frame.size);
[v.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return img;
}
93.獲取視頻的第一幀圖片
-(UIImage *)videoUrl:(NSString *)url{
NSURL *urlString = [NSURL URLWithString:url];
AVURLAsset *asset1 = [[AVURLAsset alloc] initWithURL:urlString options:nil];
AVAssetImageGenerator *generate1 = [[AVAssetImageGenerator alloc] initWithAsset:asset1];
generate1.appliesPreferredTrackTransform = YES;
NSError *err = NULL;
CMTime time = CMTimeMake(1, 2);
CGImageRef oneRef = [generate1 copyCGImageAtTime:time actualTime:NULL error:&err];
UIImage *oneImage = [[UIImage alloc] initWithCGImage:oneRef];
return oneImage;
}