--------轉載-------
1、禁止手機睡眠
[UIApplication sharedApplication].idleTimerDisabled = YES;
2、隱藏某行cell
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
// 如果是你需要隱藏的那一行,返回高度為0
if(indexPath.row == YouWantToHideRow)
return 0;
return 44;
}
// 然后再你需要隱藏cell的時候調用
[self.tableView beginUpdates];
[self.tableView endUpdates];
3、禁用button高亮
button.adjustsImageWhenHighlighted = NO;
或者在創建的時候
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
4、tableview遇到這種報錯failed to obtain a cell from its dataSource
是因為你的cell被調用的早了。先循環使用了cell,后又創建cell。順序錯了
可能原因:1、xib的cell沒有注冊 2、內存中已經有這個cell的緩存了(也就是說通過你的cellId找到的cell并不是你想要的類型),這時候需要改下cell的標識
5、cocoa pods報這個錯誤:unable to access 'https://github.com/facebook/pop.git/': Operation timed out after 0 milliseconds with 0 out of 0 bytes received
解決辦法:原因可能是網絡問題,網絡請求超時了,只需要重試就行了
6、cocoa pods 出現ERROR: While executing gem ... (Errno::EPERM)
解決辦法:
https://segmentfault.com/q/1010000002926243
7、動畫切換window的根控制器
// options是動畫選項
[UIView transitionWithView:[UIApplication sharedApplication].keyWindow duration:0.5f options:UIViewAnimationOptionTransitionCrossDissolve animations:^{
BOOL oldState = [UIView areAnimationsEnabled];
[UIView setAnimationsEnabled:NO];
[UIApplication sharedApplication].keyWindow.rootViewController = [RootViewController new];
[UIView setAnimationsEnabled:oldState];
} completion:^(BOOL finished) {
}];
8、去除數組中重復的對象
NSArray *newArr = [oldArr valueForKeyPath:@“@distinctUnionOfObjects.self"];
9、編譯的時候遇到 no such file or directory: /users/apple/XXX
是因為編譯的時候,在此路徑下找不到這個文件,解決這個問題,首先是是要檢查缺少的文件是不是在工程中,如果不在工程中,需要從本地拖進去,如果發現已經存在工程中了,或者拖進去還是報錯,這時候需要去build phases中搜索這個文件,這時候很可能會搜出現兩個相同的文件,這時候,有一個路徑是正確的,刪除另外一個即可。如果刪除了還是不行,需要把兩個都刪掉,然后重新往工程里拖進這個文件即可
build phases
10、iOS8系統中,tableView最好實現下-tableView: heightForRowAtIndexPath:這個代理方法,要不然在iOS8中可能就會出現顯示不全或者無法響應事件的問題
11、iOS8中實現側滑功能的時候這個方法必須實現,要不然在iOS8中無法側滑
// 必須寫的方法,和editActionsForRowAtIndexPath配對使用,里面什么不寫也行
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
}
12、三個通知
NSSystemTimeZoneDidChangeNotification監聽修改時間界面的兩個按鈕狀態變化
UIApplicationSignificantTimeChangeNotification 監聽用戶改變時間 (只要點擊自動設置按鈕就會調用) NSSystemClockDidChangeNotification 監聽用戶修改時間(時間不同才會調用)
13、SDWebImage本地緩存有時候會害人。如果之前緩存過一張圖片,即使下次服務器換了這張圖片,但是圖片url沒換,用sdwebimage下載下來的還是以前那張,所以遇到這種問題,不要先去懟服務器,清空下緩存再試就好了。
14、上線前注意:
1)、刪掉代碼中所有的測試代碼
2)、如果后臺有審核模式,提醒后臺開啟此模式
3)、主流程再跑一跑
4)、全局搜索waring,檢查所有標記waring的地方
15、跳進app權限設置
// 跳進app設置
if (UIApplicationOpenSettingsURLString != NULL) {
NSURL *url = [NSURL URLWithString:UIApplicationOpenSettingsURLString];
[[UIApplication sharedApplication] openURL:url];
}
}
16、給一個view截圖
UIGraphicsBeginImageContextWithOptions(view.bounds.size, YES, 0.0);
[view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
17、開發中如果要動態修改tableView的tableHeaderView或者tableFooterView的高度,需要給tableView重新設置,而不是直接更改高度。正確的做法是重新設置一下tableView.tableFooterView = 更改過高度的view。為什么?其實在iOS8以上直接改高度是沒有問題的,在iOS8中出現了contentSize不準確的問題,這是解決辦法。
18、注意對象為nil的時候,調用此對象分類的方法不會執行
19、collectionView的內容小于其寬高的時候是不能滾動的,設置可以滾動:
collectionView.alwaysBounceHorizontal = YES;
collectionView.alwaysBounceVertical = YES;
20、設置navigationBar上的title顏色和大小
[self.navigationController.navigationBar setTitleTextAttributes:@{NSForegroundColorAttributeName : [UIColor youColor], NSFontAttributeName : [UIFont systemFontOfSize:15]}]
21、顏色轉圖片
-
(UIImage *)cl_imageWithColor:(UIColor *)color {
CGRect rect = CGRectMake(0.0f, 0.0f, 1.0f, 1.0f);
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();CGContextSetFillColorWithColor(context, [color CGColor]);
CGContextFillRect(context, rect);UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();return image;
}
22、view設置圓角
define ViewBorderRadius(View, Radius, Width, Color)\
[View.layer setCornerRadius:(Radius)];
[View.layer setMasksToBounds:YES];
[View.layer setBorderWidth:(Width)];
[View.layer setBorderColor:[Color CGColor]] // view圓角
23、強/弱引用
define WeakSelf(type) __weak typeof(type) weak##type = type; // weak
define StrongSelf(type) __strong typeof(type) type = weak##type; // strong
24、由角度轉換弧度
define DegreesToRadian(x) (M_PI * (x) / 180.0)
25、由弧度轉換角度
define RadianToDegrees(radian) (radian*180.0)/(M_PI)
26、獲取圖片資源
define GetImage(imageName) [UIImage imageNamed:[NSString stringWithFormat:@"%@",imageName]]
27、獲取temp
define PathTemp NSTemporaryDirectory()
28、獲取沙盒 Document
define PathDocument [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject]
29、獲取沙盒 Cache
define PathCache [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) firstObject]
30、GCD代碼只執行一次
define kDISPATCH_ONCE_BLOCK(onceBlock) static dispatch_once_t onceToken; dispatch_once(&onceToken, onceBlock);
31、自定義NSLog
ifdef DEBUG
define NSLog(fmt, ...) NSLog((@"%s [Line %d] " fmt), PRETTY_FUNCTION, LINE, ##VA_ARGS)
else
define NSLog(...)
endif
32、Font
define FontL(s) [UIFont systemFontOfSize:s weight:UIFontWeightLight]
define FontR(s) [UIFont systemFontOfSize:s weight:UIFontWeightRegular]
define FontB(s) [UIFont systemFontOfSize:s weight:UIFontWeightBold]
define FontT(s) [UIFont systemFontOfSize:s weight:UIFontWeightThin]
define Font(s) FontL(s)
33、FORMAT
define FORMAT(f, ...) [NSString stringWithFormat:f, ## VA_ARGS]
34、在主線程上運行
define kDISPATCH_MAIN_THREAD(mainQueueBlock) dispatch_async(dispatch_get_main_queue(), mainQueueBlock);
35、開啟異步線程
define kDISPATCH_GLOBAL_QUEUE_DEFAULT(globalQueueBlock) dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), globalQueueBlocl);
36、通知
define NOTIF_ADD(n, f) [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(f) name:n object:nil]
define NOTIF_POST(n, o) [[NSNotificationCenter defaultCenter] postNotificationName:n object:o]
define NOTIF_REMV() [[NSNotificationCenter defaultCenter] removeObserver:self]
37、隨機顏色
- (UIColor *)RandomColor {
NSInteger aRedValue = arc4random() % 255;
NSInteger aGreenValue = arc4random() % 255;
NSInteger aBlueValue = arc4random() % 255;
UIColor *randColor = [UIColor colorWithRed:aRedValue / 255.0f green:aGreenValue / 255.0f blue:aBlueValue / 255.0f alpha:1.0f];
return randColor;
}
38、獲取window
+(UIWindow)getWindow {
UIWindow win = nil; //[UIApplication sharedApplication].keyWindow;
for (id item in [UIApplication sharedApplication].windows) {
if ([item class] == [UIWindow class]) {
if (!((UIWindow*)item).hidden) {
win = item;
break;
}
}
}
return win;
}
39、修改textField的placeholder的字體顏色、大小
[textField setValue:[UIColor redColor] forKeyPath:@"_placeholderLabel.textColor"];
[textField setValue:[UIFont boldSystemFontOfSize:16] forKeyPath:@"_placeholderLabel.font"];
40、統一收起鍵盤
[[[UIApplication sharedApplication] keyWindow] endEditing:YES];
41、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;
}
42、獲取app緩存大小
-
(CGFloat)getCachSize {
NSUInteger imageCacheSize = [[SDImageCache sharedImageCache] getSize];
//獲取自定義緩存大小
//用枚舉器遍歷 一個文件夾的內容
//1.獲取 文件夾枚舉器
NSString *myCachePath = [NSHomeDirectory() stringByAppendingPathComponent:@"Library/Caches"];
NSDirectoryEnumerator *enumerator = [[NSFileManager defaultManager] enumeratorAtPath:myCachePath];
__block NSUInteger count = 0;
//2.遍歷
for (NSString *fileName in enumerator) {
NSString *path = [myCachePath stringByAppendingPathComponent:fileName];
NSDictionary *fileDict = [[NSFileManager defaultManager] attributesOfItemAtPath:path error:nil];
count += fileDict.fileSize;//自定義所有緩存大小
}
// 得到是字節 轉化為M
CGFloat totalSize = ((CGFloat)imageCacheSize+count)/1024/1024;
return totalSize;
}
43、清理app緩存
- (void)handleClearView {
//刪除兩部分
//1.刪除 sd 圖片緩存
//先清除內存中的圖片緩存
[[SDImageCache sharedImageCache] clearMemory];
//清除磁盤的緩存
[[SDImageCache sharedImageCache] clearDisk];
//2.刪除自己緩存
NSString *myCachePath = [NSHomeDirectory() stringByAppendingPathComponent:@"Library/Caches"];
[[NSFileManager defaultManager] removeItemAtPath:myCachePath error:nil];
}
44、模型轉字典
static NSSet *classes;
-
(NSMutableDictionary *)getParameterDictionary {
NSMutableDictionary *dict = [NSMutableDictionary dictionary];
Class c = self.class;
while (c) {
unsigned count;
objc_property_t *properties = class_copyPropertyList([c class], &count);for (int i = 0; i < count; i++) { NSString *key = [NSString stringWithUTF8String:property_getName(properties[i])]; dict[key] = [self valueForKey:key]; } free(properties); // 獲得父類 c = class_getSuperclass(c); if ([self isClassFromFoundation:c]) break;
}
return dict;
} -
(BOOL)isClassFromFoundation:(Class)c
{
if (c == [NSObject class] || c == [NSManagedObject class]) return YES;__block BOOL result = NO;
[[self foundationClasses] enumerateObjectsUsingBlock:^(Class foundationClass, BOOL *stop) {
if ([c isSubclassOfClass:foundationClass]) {
result = YES;
*stop = YES;
}
}];
return result;
} (NSSet *)foundationClasses
{
if (classes == nil) {
// 集合中沒有NSObject,因為幾乎所有的類都是繼承自NSObject,具體是不是NSObject需要特殊判斷
classes = [NSSet setWithObjects:
[NSURL class],
[NSDate class],
[NSValue class],
[NSData class],
[NSError class],
[NSArray class],
[NSDictionary class],
[NSString class],
[NSAttributedString class], nil];
}
return classes;
}
45、交換兩個方法實現
Class aClass = [self class];
SEL originalSelector = @selector(viewWillAppear:);
SEL swizzledSelector = @selector(xxx_viewWillAppear:);
Method originalMethod = class_getInstanceMethod(aClass, originalSelector);
Method swizzledMethod = class_getInstanceMethod(aClass, swizzledSelector);
BOOL didAddMethod =
class_addMethod(aClass,
originalSelector,
method_getImplementation(swizzledMethod),
method_getTypeEncoding(swizzledMethod));
if (didAddMethod) {
class_replaceMethod(aClass,
swizzledSelector,
method_getImplementation(originalMethod),
method_getTypeEncoding(originalMethod));
} else {
method_exchangeImplementations(originalMethod, swizzledMethod);
}
46、打印百分號和引號
NSLog(@"%%");
NSLog(@"\"");
47、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");
}
}];
48、獲取手機型號
+ (NSString *)getDeviceInfo {
struct utsname systemInfo;
uname(&systemInfo);
NSString *platform = [NSString stringWithCString:systemInfo.machine encoding:NSASCIIStringEncoding];
if ([platform isEqualToString:@"iPhone1,1"]) return @"iPhone 2G";
if ([platform isEqualToString:@"iPhone1,2"]) return @"iPhone 3G";
if ([platform isEqualToString:@"iPhone2,1"]) return @"iPhone 3GS";
if ([platform isEqualToString:@"iPhone3,1"]) return @"iPhone 4";
if ([platform isEqualToString:@"iPhone3,2"]) return @"iPhone 4";
if ([platform isEqualToString:@"iPhone3,3"]) return @"iPhone 4";
if ([platform isEqualToString:@"iPhone4,1"]) return @"iPhone 4S";
if ([platform isEqualToString:@"iPhone5,1"]) return @"iPhone 5";
if ([platform isEqualToString:@"iPhone5,2"]) return @"iPhone 5";
if ([platform isEqualToString:@"iPhone5,3"]) return @"iPhone 5c";
if ([platform isEqualToString:@"iPhone5,4"]) return @"iPhone 5c";
if ([platform isEqualToString:@"iPhone6,1"]) return @"iPhone 5s";
if ([platform isEqualToString:@"iPhone6,2"]) return @"iPhone 5s";
if ([platform isEqualToString:@"iPhone7,1"]) return @"iPhone 6 Plus";
if ([platform isEqualToString:@"iPhone7,2"]) return @"iPhone 6";
if ([platform isEqualToString:@"iPhone8,1"]) return @"iPhone 6s";
if ([platform isEqualToString:@"iPhone8,2"]) return @"iPhone 6s Plus";
// 日行兩款手機型號均為日本獨占,可能使用索尼FeliCa支付方案而不是蘋果支付
if ([platform isEqualToString:@"iPhone9,1"]) return @"國行、日版、港行iPhone 7";
if ([platform isEqualToString:@"iPhone9,2"]) return @"港行、國行iPhone 7 Plus";
if ([platform isEqualToString:@"iPhone9,3"]) return @"美版、臺版iPhone 7";
if ([platform isEqualToString:@"iPhone9,4"]) return @"美版、臺版iPhone 7 Plus";
if ([platform isEqualToString:@"iPhone8,4"]) return @"iPhone SE";
if ([platform isEqualToString:@"iPod1,1"]) return @"iPod Touch 1G";
if ([platform isEqualToString:@"iPod2,1"]) return @"iPod Touch 2G";
if ([platform isEqualToString:@"iPod3,1"]) return @"iPod Touch 3G";
if ([platform isEqualToString:@"iPod4,1"]) return @"iPod Touch 4G";
if ([platform isEqualToString:@"iPod5,1"]) return @"iPod Touch 5G";
if ([platform isEqualToString:@"iPad1,1"]) return @"iPad 1G";
if ([platform isEqualToString:@"iPad2,1"]) return @"iPad 2";
if ([platform isEqualToString:@"iPad2,2"]) return @"iPad 2";
if ([platform isEqualToString:@"iPad2,3"]) return @"iPad 2";
if ([platform isEqualToString:@"iPad2,4"]) return @"iPad 2";
if ([platform isEqualToString:@"iPad2,5"]) return @"iPad Mini 1G";
if ([platform isEqualToString:@"iPad2,6"]) return @"iPad Mini 1G";
if ([platform isEqualToString:@"iPad2,7"]) return @"iPad Mini 1G";
if ([platform isEqualToString:@"iPad3,1"]) return @"iPad 3";
if ([platform isEqualToString:@"iPad3,2"]) return @"iPad 3";
if ([platform isEqualToString:@"iPad3,3"]) return @"iPad 3";
if ([platform isEqualToString:@"iPad3,4"]) return @"iPad 4";
if ([platform isEqualToString:@"iPad3,5"]) return @"iPad 4";
if ([platform isEqualToString:@"iPad3,6"]) return @"iPad 4";
if ([platform isEqualToString:@"iPad4,1"]) return @"iPad Air";
if ([platform isEqualToString:@"iPad4,2"]) return @"iPad Air";
if ([platform isEqualToString:@"iPad4,3"]) return @"iPad Air";
if ([platform isEqualToString:@"iPad4,4"]) return @"iPad Mini 2G";
if ([platform isEqualToString:@"iPad4,5"]) return @"iPad Mini 2G";
if ([platform isEqualToString:@"iPad4,6"]) return @"iPad Mini 2G";
if ([platform isEqualToString:@"i386"]) return @"iPhone Simulator";
if ([platform isEqualToString:@"x86_64"]) return @"iPhone Simulator";
return platform;
}
49、長按復制功能
- (void)viewDidLoad
{
[self.view addGestureRecognizer:[[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(pasteBoard:)]];
} - (void)pasteBoard:(UILongPressGestureRecognizer *)longPress {
if (longPress.state == UIGestureRecognizerStateBegan) {
UIPasteboard *pasteboard = [UIPasteboard generalPasteboard];
pasteboard.string = @"需要復制的文本";
}
}
50、cocoapods升級
在終端執行 sudo gem install -n / usr / local / bin cocoapods --pre
51、設置啟動頁后,依然顯示之前的
刪除app,手機重啟,重新安裝
52、判斷圖片類型
//通過圖片Data數據第一個字節 來獲取圖片擴展名
-
(NSString *)contentTypeForImageData:(NSData *)data
{
uint8_t c;
[data getBytes:&c length:1];
switch (c)
{
case 0xFF:
return @"jpeg";case 0x89: return @"png"; case 0x47: return @"gif"; case 0x49: case 0x4D: return @"tiff"; case 0x52: if ([data length] < 12) { return nil; } NSString *testString = [[NSString alloc] initWithData:[data subdataWithRange:NSMakeRange(0, 12)] encoding:NSASCIIStringEncoding]; if ([testString hasPrefix:@"RIFF"] && [testString hasSuffix:@"WEBP"]) { return @"webp"; } return nil;
}
return nil;
}
53、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);
54、獲取一個類的所有屬性
id LenderClass = objc_getClass("Lender");
unsigned int outCount, i;
objc_property_t *properties = class_copyPropertyList(LenderClass, &outCount);
for (i = 0; i < outCount; i++) {
objc_property_t property = properties[i];
fprintf(stdout, "%s %s\n", property_getName(property), property_getAttributes(property));
}
55、image圓角
- (UIImage *)circleImage
{
// NO代表透明
UIGraphicsBeginImageContextWithOptions(self.size, NO, 1);
// 獲得上下文
CGContextRef ctx = UIGraphicsGetCurrentContext();
// 添加一個圓
CGRect rect = CGRectMake(0, 0, self.size.width, self.size.height);
// 方形變圓形
CGContextAddEllipseInRect(ctx, rect);
// 裁剪
CGContextClip(ctx);
// 將圖片畫上去
[self drawInRect:rect];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
56、image拉伸
(UIImage *)resizableImage:(NSString *)imageName
{
UIImage *image = [UIImage imageNamed:imageName];
CGFloat imageW = image.size.width;
CGFloat imageH = image.size.height;
return [image resizableImageWithCapInsets:UIEdgeInsetsMake(imageH * 0.5, imageW * 0.5, imageH * 0.5, imageW * 0.5) resizingMode:UIImageResizingModeStretch];
}
57、JSON字符串轉字典(NSDictionary *)parseJSONStringToNSDictionary:(NSString *)JSONString {
NSData *JSONData = [JSONString dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary *responseJSON = [NSJSONSerialization JSONObjectWithData:JSONData options:NSJSONReadingMutableLeaves error:nil];
return responseJSON;
}
58、身份證號驗證
- (BOOL)validateIdentityCard {
BOOL flag;
if (self.length <= 0) {
flag = NO;
return flag;
}
NSString *regex2 = @"^(\d{14}|\d{17})(\d|[xX])$";
NSPredicate *identityCardPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex2];
return [identityCardPredicate evaluateWithObject:self];
}
59、獲取設備mac地址
-
(NSString *)macAddress {
int mib[6];
size_t len;
char *buf;
unsigned char *ptr;
struct if_msghdr *ifm;
struct sockaddr_dl *sdl;mib[0] = CTL_NET;
mib[1] = AF_ROUTE;
mib[2] = 0;
mib[3] = AF_LINK;
mib[4] = NET_RT_IFLIST;if((mib[5] = if_nametoindex("en0")) == 0) {
printf("Error: if_nametoindex error\n");
return NULL;
}if(sysctl(mib, 6, NULL, &len, NULL, 0) < 0) {
printf("Error: sysctl, take 1\n");
return NULL;
}if((buf = malloc(len)) == NULL) {
printf("Could not allocate memory. Rrror!\n");
return NULL;
}if(sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
printf("Error: sysctl, take 2");
return NULL;
}ifm = (struct if_msghdr *)buf;
sdl = (struct sockaddr_dl *)(ifm + 1);
ptr = (unsigned char *)LLADDR(sdl);
NSString *outstring = [NSString stringWithFormat:@"%02X:%02X:%02X:%02X:%02X:%02X",
*ptr, *(ptr+1), *(ptr+2), *(ptr+3), *(ptr+4), *(ptr+5)];
free(buf);return outstring;
}
60、導入自定義字體庫
1、找到你想用的字體的 ttf 格式,拖入工程
2、在工程的plist中增加一行數組,“Fonts provided by application”
3、為這個key添加一個item,value為你剛才導入的ttf文件名
4、直接使用即可:label.font = [UIFont fontWithName:@"你剛才導入的ttf文件名" size:20.0];
61、拿到當前正在顯示的控制器,不管是push進去的,還是present進去的都能拿到
- (UIViewController )getVisibleViewControllerFrom:(UIViewController)vc {
if ([vc isKindOfClass:[UINavigationController class]]) {
return [self getVisibleViewControllerFrom:[((UINavigationController) vc) visibleViewController]];
}else if ([vc isKindOfClass:[UITabBarController class]]){
return [self getVisibleViewControllerFrom:[((UITabBarController) vc) selectedViewController]];
} else {
if (vc.presentedViewController) {
return [self getVisibleViewControllerFrom:vc.presentedViewController];
} else {
return vc;
}
}
}
62、runtime為一個類動態添加屬性
// 動態添加屬性的本質是: 讓對象的某個屬性與值產生關聯
objc_setAssociatedObject(self, WZBPlaceholderViewKey, placeholderView, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
63、獲取runtime為一個類動態添加的屬性
objc_getAssociatedObject(self, WZBPlaceholderViewKey);
64、KVO監聽某個對象的屬性
// 添加監聽者
[self addObserver:self forKeyPath:property options:NSKeyValueObservingOptionNew context:nil];
// 當監聽的屬性值變化的時候會來到這個方法
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
if ([keyPath isEqualToString:@"property"]) {
[self textViewTextChange];
} else {
}
}
65、Reachability判斷網絡狀態
NetworkStatus status = [[Reachability reachabilityForInternetConnection] currentReachabilityStatus];
if (status == NotReachable) {
NSLog(@"當前設備無網絡");
}
if (status == ReachableViaWiFi) {
NSLog(@"當前wifi網絡");
}
if (status == NotReachable) {
NSLog(@"當前蜂窩移動網絡");
}