- 獲取磁盤總空間大小
<pre>//磁盤總空間
- (CGFloat)diskOfAllSizeMBytes{
CGFloat size = 0.0;
NSError *error;
NSDictionary *dic = [[NSFileManager defaultManager] attributesOfFileSystemForPath:NSHomeDirectory() error:&error];
if (error) {
ifdef DEBUG
NSLog(@"error: %@", error.localizedDescription);
endif
}else{
NSNumber *number = [dic objectForKey:NSFileSystemSize];
size = [number floatValue]/1024/1024;
}
return size;
}
</pre>
- 獲取磁盤可用空間大小
<pre>//磁盤可用空間
- (CGFloat)diskOfFreeSizeMBytes{
CGFloat size = 0.0;
NSError *error;
NSDictionary *dic = [[NSFileManager defaultManager] attributesOfFileSystemForPath:NSHomeDirectory() error:&error];
if (error) {
ifdef DEBUG
NSLog(@"error: %@", error.localizedDescription);
endif
}else{
NSNumber *number = [dic objectForKey:NSFileSystemFreeSize];
size = [number floatValue]/1024/1024;
}
return size;
}
</pre>
- 獲取指定路徑下某個文件的大小
<pre>//獲取文件大小
- (long long)fileSizeAtPath:(NSString *)filePath{
NSFileManager *fileManager = [NSFileManager defaultManager];
if (![fileManager fileExistsAtPath:filePath]) return 0;
return [[fileManager attributesOfItemAtPath:filePath error:nil] fileSize];
}
</pre>
- 獲取文件夾下所有文件的大小
<pre>//獲取文件夾下所有文件的大小
- (long long)folderSizeAtPath:(NSString *)folderPath{
NSFileManager *fileManager = [NSFileManager defaultManager];
if (![fileManager fileExistsAtPath:folderPath]) return 0;
NSEnumerator *filesEnumerator = [[fileManager subpathsAtPath:folderPath] objectEnumerator];
NSString *fileName;
long long folerSize = 0;
while ((fileName = [filesEnumerator nextObject]) != nil) {
NSString *filePath = [folderPath stringByAppendingPathComponent:fileName];
folerSize += [self fileSizeAtPath:filePath];
}
return folerSize;
}
</pre>
- 獲取字符串(或漢字)首字母
<pre>//獲取字符串(或漢字)首字母
- (NSString *)firstCharacterWithString:(NSString *)string{
NSMutableString *str = [NSMutableString stringWithString:string];
CFStringTransform((CFMutableStringRef)str, NULL, kCFStringTransformMandarinLatin, NO);
CFStringTransform((CFMutableStringRef)str, NULL, kCFStringTransformStripDiacritics, NO);
NSString *pingyin = [str capitalizedString];
return [pingyin substringToIndex:1];
}
</pre>
- 將字符串數組按照元素首字母順序進行排序分組
<pre>//將字符串數組按照元素首字母順序進行排序分組
- (NSDictionary *)dictionaryOrderByCharacterWithOriginalArray:(NSArray *)array{
if (array.count == 0) {
return nil;
}
for (id obj in array) {
if (![obj isKindOfClass:[NSString class]]) {
return nil;
}
}
UILocalizedIndexedCollation *indexedCollation = [UILocalizedIndexedCollation currentCollation];
NSMutableArray *objects = [NSMutableArray arrayWithCapacity:indexedCollation.sectionTitles.count];
//創建27個分組數組
for (int i = 0; i < indexedCollation.sectionTitles.count; i++) {
NSMutableArray *obj = [NSMutableArray array];
[objects addObject:obj];
}
NSMutableArray *keys = [NSMutableArray arrayWithCapacity:objects.count];
//按字母順序進行分組
NSInteger lastIndex = -1;
for (int i = 0; i < array.count; i++) {
NSInteger index = [indexedCollation sectionForObject:array[i] collationStringSelector:@selector(uppercaseString)];
[[objects objectAtIndex:index] addObject:array[i]];
lastIndex = index;
}
//去掉空數組
for (int i = 0; i < objects.count; i++) {
NSMutableArray *obj = objects[i];
if (obj.count == 0) {
[objects removeObject:obj];
}
}
//獲取索引字母
for (NSMutableArray *obj in objects) {
NSString *str = obj[0];
NSString *key = [self firstCharacterWithString:str];
[keys addObject:key];
}
NSMutableDictionary *dic = [NSMutableDictionary dictionary];
[dic setObject:objects forKey:keys];
return dic;
}
//獲取字符串(或漢字)首字母
- (NSString *)firstCharacterWithString:(NSString *)string{
NSMutableString *str = [NSMutableString stringWithString:string];
CFStringTransform((CFMutableStringRef)str, NULL, kCFStringTransformMandarinLatin, NO);
CFStringTransform((CFMutableStringRef)str, NULL, kCFStringTransformStripDiacritics, NO);
NSString *pingyin = [str capitalizedString];
return [pingyin substringToIndex:1];
</pre>
- 獲取當前時間
<pre>//獲取當前時間
//format: @"yyyy-MM-dd HH:mm:ss"、@"yyyy年MM月dd日 HH時mm分ss秒"
- (NSString *)currentDateWithFormat:(NSString *)format{
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:format];
return [dateFormatter stringFromDate:[NSDate date]];
}
</pre>
- 計算上次日期距離現在多久, 如 xx 小時前、xx 分鐘前等
<pre>/**
- 計算上次日期距離現在多久
- @param lastTime 上次日期(需要和格式對應)
- @param format1 上次日期格式
- @param currentTime 最近日期(需要和格式對應)
- @param format2 最近日期格式
- @return xx分鐘前、xx小時前、xx天前
*/
(NSString *)timeIntervalFromLastTime:(NSString *)lastTime
lastTimeFormat:(NSString *)format1
ToCurrentTime:(NSString *)currentTime
currentTimeFormat:(NSString *)format2{
//上次時間
NSDateFormatter *dateFormatter1 = [[NSDateFormatter alloc]init];
dateFormatter1.dateFormat = format1;
NSDate *lastDate = [dateFormatter1 dateFromString:lastTime];
//當前時間
NSDateFormatter *dateFormatter2 = [[NSDateFormatter alloc]init];
dateFormatter2.dateFormat = format2;
NSDate *currentDate = [dateFormatter2 dateFromString:currentTime];
return [Utilities timeIntervalFromLastTime:lastDate ToCurrentTime:currentDate];
}-
(NSString *)timeIntervalFromLastTime:(NSDate *)lastTime ToCurrentTime:(NSDate *)currentTime{
NSTimeZone *timeZone = [NSTimeZone systemTimeZone];
//上次時間
NSDate *lastDate = [lastTime dateByAddingTimeInterval:[timeZone secondsFromGMTForDate:lastTime]];
//當前時間
NSDate *currentDate = [currentTime dateByAddingTimeInterval:[timeZone secondsFromGMTForDate:currentTime]];
//時間間隔
NSInteger intevalTime = [currentDate timeIntervalSinceReferenceDate] - [lastDate timeIntervalSinceReferenceDate];//秒、分、小時、天、月、年
NSInteger minutes = intevalTime / 60;
NSInteger hours = intevalTime / 60 / 60;
NSInteger day = intevalTime / 60 / 60 / 24;
NSInteger month = intevalTime / 60 / 60 / 24 / 30;
NSInteger yers = intevalTime / 60 / 60 / 24 / 365;if (minutes <= 10) {
return @"剛剛";
}else if (minutes < 60){
return [NSString stringWithFormat: @"%ld分鐘前",(long)minutes];
}else if (hours < 24){
return [NSString stringWithFormat: @"%ld小時前",(long)hours];
}else if (day < 30){
return [NSString stringWithFormat: @"%ld天前",(long)day];
}else if (month < 12){
NSDateFormatter * df =[[NSDateFormatter alloc]init];
df.dateFormat = @"M月d日";
NSString * time = [df stringFromDate:lastDate];
return time;
}else if (yers >= 1){
NSDateFormatter * df =[[NSDateFormatter alloc]init];
df.dateFormat = @"yyyy年M月d日";
NSString * time = [df stringFromDate:lastDate];
return time;
}
return @"";
}
</pre>
- 判斷手機號碼格式是否正確
<pre>//判斷手機號碼格式是否正確
-
(BOOL)valiMobile:(NSString )mobile{
mobile = [mobile stringByReplacingOccurrencesOfString:@" " withString:@""];
if (mobile.length != 11)
{
return NO;
}else{
/*
* 移動號段正則表達式
/
NSString CM_NUM = @"^((13[4-9])|(147)|(15[0-2,7-9])|(178)|(18[2-4,7-8]))\d{8}|(1705)\d{7}$";
/
* 聯通號段正則表達式
/
NSString CU_NUM = @"^((13[0-2])|(145)|(15[5-6])|(176)|(18[5,6]))\d{8}|(1709)\d{7}$";
/
* 電信號段正則表達式
*/
NSString *CT_NUM = @"^((133)|(153)|(177)|(18[0,1,9]))\d{8}$";
NSPredicate *pred1 = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CM_NUM];
BOOL isMatch1 = [pred1 evaluateWithObject:mobile];
NSPredicate *pred2 = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CU_NUM];
BOOL isMatch2 = [pred2 evaluateWithObject:mobile];
NSPredicate *pred3 = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CT_NUM];
BOOL isMatch3 = [pred3 evaluateWithObject:mobile];if (isMatch1 || isMatch2 || isMatch3) { return YES; }else{ return NO; }}
}
</pre>
- 判斷郵箱格式是否正確
<pre>//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];
}
</pre>
- 將十六進制顏色轉換為 UIColor 對象
<pre>//將十六進制顏色轉換為 UIColor 對象
- (UIColor *)colorWithHexString:(NSString *)color{
NSString *cString = [[color stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];
// String should be 6 or 8 characters
if ([cString length] < 6) {
return [UIColor clearColor];
}
// strip "0X" or "#" if it appears
if ([cString hasPrefix:@"0X"])
cString = [cString substringFromIndex:2];
if ([cString hasPrefix:@"#"])
cString = [cString substringFromIndex:1];
if ([cString length] != 6)
return [UIColor clearColor];
// Separate into r, g, b substrings
NSRange range;
range.location = 0;
range.length = 2;
//r
NSString *rString = [cString substringWithRange:range];
//g
range.location = 2;
NSString *gString = [cString substringWithRange:range];
//b
range.location = 4;
NSString *bString = [cString substringWithRange:range];
// Scan values
unsigned int r, g, b;
[[NSScanner scannerWithString:rString] scanHexInt:&r];
[[NSScanner scannerWithString:gString] scanHexInt:&g];
[[NSScanner scannerWithString:bString] scanHexInt:&b];
return [UIColor colorWithRed:((float) r / 255.0f) green:((float) g / 255.0f) blue:((float) b / 255.0f) alpha:1.0f];
}
</pre>
- 對圖片進行濾鏡處理
<pre>#pragma mark - 對圖片進行濾鏡處理
// 懷舊 --> CIPhotoEffectInstant 單色 --> CIPhotoEffectMono
// 黑白 --> CIPhotoEffectNoir 褪色 --> CIPhotoEffectFade
// 色調 --> CIPhotoEffectTonal 沖印 --> CIPhotoEffectProcess
// 歲月 --> CIPhotoEffectTransfer 鉻黃 --> CIPhotoEffectChrome
// CILinearToSRGBToneCurve, CISRGBToneCurveToLinear, CIGaussianBlur, CIBoxBlur, CIDiscBlur, CISepiaTone, CIDepthOfField
- (UIImage *)filterWithOriginalImage:(UIImage *)image filterName:(NSString *)name{
CIContext *context = [CIContext contextWithOptions:nil];
CIImage *inputImage = [[CIImage alloc] initWithImage:image];
CIFilter *filter = [CIFilter filterWithName:name];
[filter setValue:inputImage forKey:kCIInputImageKey];
CIImage *result = [filter valueForKey:kCIOutputImageKey];
CGImageRef cgImage = [context createCGImage:result fromRect:[result extent]];
UIImage *resultImage = [UIImage imageWithCGImage:cgImage];
CGImageRelease(cgImage);
return resultImage;
}
</pre>
- 對圖片進行模糊處理
<pre>#pragma mark - 對圖片進行模糊處理
// CIGaussianBlur ---> 高斯模糊
// CIBoxBlur ---> 均值模糊(Available in iOS 9.0 and later)
// CIDiscBlur ---> 環形卷積模糊(Available in iOS 9.0 and later)
// CIMedianFilter ---> 中值模糊, 用于消除圖像噪點, 無需設置radius(Available in iOS 9.0 and later)
// CIMotionBlur ---> 運動模糊, 用于模擬相機移動拍攝時的掃尾效果(Available in iOS 9.0 and later)
- (UIImage *)blurWithOriginalImage:(UIImage *)image blurName:(NSString *)name radius:(NSInteger)radius{
CIContext *context = [CIContext contextWithOptions:nil];
CIImage *inputImage = [[CIImage alloc] initWithImage:image];
CIFilter *filter;
if (name.length != 0) {
filter = [CIFilter filterWithName:name];
[filter setValue:inputImage forKey:kCIInputImageKey];
if (![name isEqualToString:@"CIMedianFilter"]) {
[filter setValue:@(radius) forKey:@"inputRadius"];
}
CIImage *result = [filter valueForKey:kCIOutputImageKey];
CGImageRef cgImage = [context createCGImage:result fromRect:[result extent]];
UIImage *resultImage = [UIImage imageWithCGImage:cgImage];
CGImageRelease(cgImage);
return resultImage;
}else{
return nil;
}
}
</pre>
- 調整圖片飽和度、亮度、對比度
<pre>/**
- 調整圖片飽和度, 亮度, 對比度
- @param image 目標圖片
- @param saturation 飽和度
- @param brightness 亮度: -1.0 ~ 1.0
- @param contrast 對比度
*/
-
(UIImage *)colorControlsWithOriginalImage:(UIImage *)image
saturation:(CGFloat)saturation
brightness:(CGFloat)brightness
contrast:(CGFloat)contrast{
CIContext *context = [CIContext contextWithOptions:nil];
CIImage *inputImage = [[CIImage alloc] initWithImage:image];
CIFilter *filter = [CIFilter filterWithName:@"CIColorControls"];
[filter setValue:inputImage forKey:kCIInputImageKey];[filter setValue:@(saturation) forKey:@"inputSaturation"];
[filter setValue:@(brightness) forKey:@"inputBrightness"];
[filter setValue:@(contrast) forKey:@"inputContrast"];CIImage *result = [filter valueForKey:kCIOutputImageKey];
CGImageRef cgImage = [context createCGImage:result fromRect:[result extent]];
UIImage *resultImage = [UIImage imageWithCGImage:cgImage];
CGImageRelease(cgImage);
return resultImage;
}
</pre>
- 創建一張實時模糊效果 View (毛玻璃效果)
<pre>//Avilable in iOS 8.0 and later
- (UIVisualEffectView *)effectViewWithFrame:(CGRect)frame{
UIBlurEffect *effect = [UIBlurEffect effectWithStyle:UIBlurEffectStyleLight];
UIVisualEffectView *effectView = [[UIVisualEffectView alloc] initWithEffect:effect];
effectView.frame = frame;
return effectView;
}
</pre>
- 全屏截圖
<pre>//全屏截圖
- (UIImage *)shotScreen{
UIWindow *window = [UIApplication sharedApplication].keyWindow;
UIGraphicsBeginImageContext(window.bounds.size);
[window.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
</pre>
- 截取一張 view 生成圖片
<pre>//截取view生成一張圖片
- (UIImage *)shotWithView:(UIView *)view{
UIGraphicsBeginImageContext(view.bounds.size);
[view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
</pre>
- 截取view中某個區域生成一張圖片
<pre>//截取view中某個區域生成一張圖片
- (UIImage *)shotWithView:(UIView *)view scope:(CGRect)scope{
CGImageRef imageRef = CGImageCreateWithImageInRect([self shotWithView:view].CGImage, scope);
UIGraphicsBeginImageContext(scope.size);
CGContextRef context = UIGraphicsGetCurrentContext();
CGRect rect = CGRectMake(0, 0, scope.size.width, scope.size.height);
CGContextTranslateCTM(context, 0, rect.size.height);//下移
CGContextScaleCTM(context, 1.0f, -1.0f);//上翻
CGContextDrawImage(context, rect, imageRef);
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
CGImageRelease(imageRef);
CGContextRelease(context);
return image;
}
</pre>
- 壓縮圖片到指定尺寸大小
<pre>//壓縮圖片到指定尺寸大小
- (UIImage *)compressOriginalImage:(UIImage *)image toSize:(CGSize)size{
UIImage *resultImage = image;
UIGraphicsBeginImageContext(size);
[resultImage drawInRect:CGRectMake(0, 0, size.width, size.height)];
UIGraphicsEndImageContext();
return resultImage;
}
</pre>
- 壓縮圖片到指定文件大小
<pre>//壓縮圖片到指定文件大小
- (NSData *)compressOriginalImage:(UIImage *)image toMaxDataSizeKBytes:(CGFloat)size{
NSData *data = UIImageJPEGRepresentation(image, 1.0);
CGFloat dataKBytes = data.length/1000.0;
CGFloat maxQuality = 0.9f;
CGFloat lastData = dataKBytes;
while (dataKBytes > size && maxQuality > 0.01f) {
maxQuality = maxQuality - 0.01f;
data = UIImageJPEGRepresentation(image, maxQuality);
dataKBytes = data.length/1000.0;
if (lastData == dataKBytes) {
break;
}else{
lastData = dataKBytes;
}
}
return data;
}
</pre>
- 獲取設備 IP 地址
需要先引入下頭文件:
Objective-C
1
2
import <ifaddrs.h>
import <arpa/inet.h>
<pre>//獲取設備 IP 地址
- (NSString *)getIPAddress {
NSString *address = @"error";
struct ifaddrs *interfaces = NULL;
struct ifaddrs *temp_addr = NULL;
int success = 0;
success = getifaddrs(&interfaces);
if (success == 0) {
temp_addr = interfaces;
while(temp_addr != NULL) {
if(temp_addr->ifa_addr->sa_family == AF_INET) {
if([[NSString stringWithUTF8String:temp_addr->ifa_name] isEqualToString:@"en0"]) {
address = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];
}
}
temp_addr = temp_addr->ifa_next;
}
}
freeifaddrs(interfaces);
return address;
}
</pre>
- 判斷字符串中是否含有空格
<pre>+ (BOOL)isHaveSpaceInString:(NSString *)string{
NSRange _range = [string rangeOfString:@" "];
if (_range.location != NSNotFound) {
return YES;
}else {
return NO;
}
}
</pre>
- 判斷字符串中是否含有某個字符串
<pre>+ (BOOL)isHaveString:(NSString *)string1 InString:(NSString *)string2{
NSRange _range = [string2 rangeOfString:string1];
if (_range.location != NSNotFound) {
return YES;
}else {
return NO;
}
}
</pre>
- 判斷字符串中是否含有中文
<pre>+ (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;
}
</pre>
- 判斷字符串是否全部為數字
<pre>+ (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>
- 繪制虛線
<pre>/*
** lineFrame: 虛線的 frame
** length: 虛線中短線的寬度
** spacing: 虛線中短線之間的間距
** color: 虛線中短線的顏色
*/
- (UIView *)createDashedLineWithFrame:(CGRect)lineFrame
lineLength:(int)length
lineSpacing:(int)spacing
lineColor:(UIColor *)color{
UIView *dashedLine = [[UIView alloc] initWithFrame:lineFrame];
dashedLine.backgroundColor = [UIColor clearColor];
CAShapeLayer *shapeLayer = [CAShapeLayer layer];
[shapeLayer setBounds:dashedLine.bounds];
[shapeLayer setPosition:CGPointMake(CGRectGetWidth(dashedLine.frame) / 2, CGRectGetHeight(dashedLine.frame))];
[shapeLayer setFillColor:[UIColor clearColor].CGColor];
[shapeLayer setStrokeColor:color.CGColor];
[shapeLayer setLineWidth:CGRectGetHeight(dashedLine.frame)];
[shapeLayer setLineJoin:kCALineJoinRound];
[shapeLayer setLineDashPattern:[NSArray arrayWithObjects:[NSNumber numberWithInt:length], [NSNumber numberWithInt:spacing], nil]];
CGMutablePathRef path = CGPathCreateMutable();
CGPathMoveToPoint(path, NULL, 0, 0);
CGPathAddLineToPoint(path, NULL, CGRectGetWidth(dashedLine.frame), 0);
[shapeLayer setPath:path];
CGPathRelease(path);
[dashedLine.layer addSublayer:shapeLayer];
return dashedLine;
}
</pre>
1，打印View所有子視圖
<pre>po [[self view]recursiveDescription]</pre>
2，layoutSubviews調用的調用時機
<pre>* 當視圖第一次顯示的時候會被調用
- 當這個視圖顯示到屏幕上了,點擊按鈕
- 添加子視圖也會調用這個方法
- 當本視圖的大小發生改變的時候是會調用的
- 當子視圖的frame發生改變的時候是會調用的
- 當刪除子視圖的時候是會調用的</pre>
3，NSString過濾特殊字符
<pre>// 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 = [trimString stringByTrimmingCharactersInSet:set];</pre>
4，TransForm屬性
<pre>//平移按鈕
CGAffineTransform transForm = self.buttonView.transform;
self.buttonView.transform = CGAffineTransformTranslate(transForm, 10, 0);
//旋轉按鈕
CGAffineTransform transForm = self.buttonView.transform;
self.buttonView.transform = CGAffineTransformRotate(transForm, M_PI_4);
//縮放按鈕
self.buttonView.transform = CGAffineTransformScale(transForm, 1.2, 1.2);
//初始化復位
self.buttonView.transform = CGAffineTransformIdentity;</pre>
5，去掉分割線多余15像素
<pre>首先在viewDidLoad方法加入以下代碼：
if ([self.tableView respondsToSelector:@selector(setSeparatorInset:)]) {
[self.tableView setSeparatorInset:UIEdgeInsetsZero];
}
if ([self.tableView respondsToSelector:@selector(setLayoutMargins:)]) {
[self.tableView setLayoutMargins:UIEdgeInsetsZero];
}
然后在重寫willDisplayCell方法
- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell
forRowAtIndexPath:(NSIndexPath *)indexPath{
if ([cell respondsToSelector:@selector(setSeparatorInset:)]) {
[cell setSeparatorInset:UIEdgeInsetsZero];
}
if ([cell respondsToSelector:@selector(setLayoutMargins:)]) {
[cell setLayoutMargins:UIEdgeInsetsZero];
}
}</pre>
6，計算方法耗時時間間隔
<pre>// 獲取時間間隔
define TICK CFAbsoluteTime start = CFAbsoluteTimeGetCurrent();
define TOCK NSLog(@"Time: %f", CFAbsoluteTimeGetCurrent() - start)</pre>
7，Color顏色宏定義
<pre>// 隨機顏色
define RANDOM_COLOR [UIColor colorWithRed:arc4random_uniform(256) / 255.0 green:arc4random_uniform(256) / 255.0 blue:arc4random_uniform(256) / 255.0 alpha:1]
// 顏色(RGB)
define RGBCOLOR(r, g, b) [UIColor colorWithRed:(r)/255.0f green:(g)/255.0f blue:(b)/255.0f alpha:1]
// 利用這種方法設置顏色和透明值，可不影響子視圖背景色
define RGBACOLOR(r, g, b, a) [UIColor colorWithRed:(r)/255.0f green:(g)/255.0f blue:(b)/255.0f alpha:(a)]
</pre>
8，Alert提示宏定義
<pre>- (void)exitApplication {
AppDelegate *app = [UIApplication sharedApplication].delegate;
UIWindow *window = app.window;
[UIView animateWithDuration:1.0f animations:^{
window.alpha = 0;
} completion:^(BOOL finished) {
exit(0);
}];
}</pre>
9，NSArray 快速求總和 最大值 最小值 和 平均值
<pre>NSArray *array = [NSArray arrayWithObjects:@"2.0", @"2.3", @"3.0", @"4.0", @"10", nil];
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);
</pre>
10修改Label中不同文字顏色
<pre>- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
[self editStringColor:self.label.text editStr:@"好" color:[UIColor blueColor]];
}
-
(void)editStringColor:(NSString *)string editStr:(NSString *)editStr color:(UIColor *)color {
// string為整體字符串, editStr為需要修改的字符串
NSRange range = [string rangeOfString:editStr];NSMutableAttributedString *attribute = [[NSMutableAttributedString alloc] initWithString:string];
// 設置屬性修改字體顏色UIColor與大小UIFont
[attribute addAttributes:@{NSForegroundColorAttributeName:color} range:range];self.label.attributedText = attribute;
}</pre>
10，播放聲音
<pre>#import
// 1.獲取音效資源的路徑
NSString *path = [[NSBundle mainBundle]pathForResource:@"pour_milk" ofType:@"wav"];
// 2.將路勁轉化為url
NSURL *tempUrl = [NSURL fileURLWithPath:path];
// 3.用轉化成的url創建一個播放器
NSError *error = nil;
AVAudioPlayer *play = [[AVAudioPlayer alloc]initWithContentsOfURL:tempUrl error:&error];
self.player = play;
// 4.播放
[play play];</pre>
11檢測是否IPad Pro和其它設備型號
<pre>- (BOOL)isIpadPro
{
UIScreen *Screen = [UIScreen mainScreen];
CGFloat width = Screen.nativeBounds.size.width/Screen.nativeScale;
CGFloat height = Screen.nativeBounds.size.height/Screen.nativeScale;
BOOL isIpad =[[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad;
BOOL hasIPadProWidth = fabs(width - 1024.f) = 8.0)</pre>
12修改Tabbar Item的屬性
// 修改標題位置
self.tabBarItem.titlePositionAdjustment = UIOffsetMake(0, -10);
// 修改圖片位置
self.tabBarItem.imageInsets = UIEdgeInsetsMake(-3, 0, 3, 0);
// 批量修改屬性
for (UIBarItem *item in self.tabBarController.tabBar.items) {
[item setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:
[UIFont fontWithName:@"Helvetica" size:19.0], NSFontAttributeName, nil]
forState:UIControlStateNormal];
}
// 設置選中和未選中字體顏色
[[UITabBar appearance] setShadowImage:[[UIImage alloc] init]];
//未選中字體顏色
[[UITabBarItem appearance] setTitleTextAttributes:@{NSForegroundColorAttributeName:[UIColor greenColor]} forState:UIControlStateNormal];
//選中字體顏色
[[UITabBarItem appearance] setTitleTextAttributes:@{NSForegroundColorAttributeName:[UIColor cyanColor]} forState:UIControlStateSelected];
12，NULL – nil – Nil – NSNULL的區別
<pre>* nil是OC的，空對象，地址指向空（0）的對象。對象的字面零值
Nil是Objective-C類的字面零值
NULL是C的，空地址，地址的數值是0，是個長整數
NSNull用于解決向NSArray和NSDictionary等集合中添加空值的問題</pre>
11，去掉BackBarButtonItem的文字
<pre>[[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(0, -60)
forBarMetrics:UIBarMetricsDefault]</pre>
12，控件不能交互的一些原因
<pre>1，控件的userInteractionEnabled = NO
2，透明度小于等于0.01，aplpha
3，控件被隱藏的時候，hidden = YES
4，子視圖的位置超出了父視圖的有效范圍，子視圖無法交互，設置了。
5，需要交互的視圖，被其他視圖蓋住（其他視圖開啟了用戶交互）。</pre>
12，修改UITextField中Placeholder的文字顏色
<pre>[text setValue:[UIColor redColor] forKeyPath:@"_placeholderLabel.textColor"];
}</pre>
13，視圖的生命周期
<pre>1、 alloc 創建對象，分配空間
2、 init (initWithNibName) 初始化對象，初始化數據
3、 loadView 從nib載入視圖 ，除非你沒有使用xib文件創建視圖
4、 viewDidLoad 載入完成，可以進行自定義數據以及動態創建其他控件
5、 viewWillAppear視圖將出現在屏幕之前，馬上這個視圖就會被展現在屏幕上了
6、 viewDidAppear 視圖已在屏幕上渲染完成
1、viewWillDisappear 視圖將被從屏幕上移除之前執行
2、viewDidDisappear 視圖已經被從屏幕上移除，用戶看不到這個視圖了
3、dealloc 視圖被銷毀，此處需要對你在init和viewDidLoad中創建的對象進行釋放.
viewVillUnload－ 當內存過低，即將釋放時調用；
viewDidUnload－當內存過低，釋放一些不需要的視圖時調用。</pre>
14，應用程序的生命周期
<pre>1，啟動但還沒進入狀態保存 ：
- (BOOL)application:(UIApplication *)application willFinishLaunchingWithOptions:(NSDictionary *)launchOptions
2，基本完成程序準備開始運行：
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
3，當應用程序將要入非活動狀態執行，應用程序不接收消息或事件，比如來電話了：
- (void)applicationWillResignActive:(UIApplication *)application
4，當應用程序入活動狀態執行，這個剛好跟上面那個方法相反：
- (void)applicationDidBecomeActive:(UIApplication *)application
5，當程序被推送到后臺的時候調用。所以要設置后臺繼續運行，則在這個函數里面設置即可：
- (void)applicationDidEnterBackground:(UIApplication *)application
6，當程序從后臺將要重新回到前臺時候調用，這個剛好跟上面的那個方法相反：
- (void)applicationWillEnterForeground:(UIApplication *)application
7，當程序將要退出是被調用，通常是用來保存數據和一些退出前的清理工作：
- (void)applicationWillTerminate:(UIApplication *)application
</pre>
15，判斷view是不是指定視圖的子視圖
<pre> BOOL isView = [textView isDescendantOfView:self.view];
</pre>
16，判斷對象是否遵循了某協議
<pre>if ([self.selectedController conformsToProtocol:@protocol(RefreshPtotocol)]) {
[self.selectedController performSelector:@selector(onTriggerRefresh)];
}</pre>
17，頁面強制橫屏
<pre>#pragma mark - 強制橫屏代碼
- (BOOL)shouldAutorotate{
//是否支持轉屏
return NO;
} - (UIInterfaceOrientationMask)supportedInterfaceOrientations{
//支持哪些轉屏方向
return UIInterfaceOrientationMaskLandscape;
} - (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation{
return UIInterfaceOrientationLandscapeRight;
} - (BOOL)prefersStatusBarHidden{
return NO;
}</pre>
18，系統鍵盤通知消息
<pre>1、UIKeyboardWillShowNotification-將要彈出鍵盤
2、UIKeyboardDidShowNotification-顯示鍵盤
3、UIKeyboardWillHideNotification-將要隱藏鍵盤
4、UIKeyboardDidHideNotification-鍵盤已經隱藏
5、UIKeyboardWillChangeFrameNotification-鍵盤將要改變frame
6、UIKeyboardDidChangeFrameNotification-鍵盤已經改變frame</pre>
19，關閉navigationController的滑動返回手勢
<pre>self.navigationController.interactivePopGestureRecognizer.enabled = NO;</pre>
20，設置狀態欄背景為任意的顏色
<pre>- (void)setStatusColor
{
UIView *statusBarView = [[UIView alloc] initWithFrame:CGRectMake(0, 0,[UIScreen mainScreen].bounds.size.width, 20)];
statusBarView.backgroundColor = [UIColor orangeColor];
[self.view addSubview:statusBarView];
}</pre>
22，Label行間距
<pre>-（void）test{
NSMutableAttributedString *attributedString =
[[NSMutableAttributedString alloc] initWithString:self.contentLabel.text];
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
[paragraphStyle setLineSpacing:3];
//調整行間距
[attributedString addAttribute:NSParagraphStyleAttributeName
value:paragraphStyle
range:NSMakeRange(0, [self.contentLabel.text length])];
self.contentLabel.attributedText = attributedString;
}
</pre>
23，UIImageView填充模式
<pre>@"UIViewContentModeScaleToFill", // 拉伸自適應填滿整個視圖
@"UIViewContentModeScaleAspectFit", // 自適應比例大小顯示
@"UIViewContentModeScaleAspectFill", // 原始大小顯示
@"UIViewContentModeRedraw", // 尺寸改變時重繪
@"UIViewContentModeCenter", // 中間
@"UIViewContentModeTop", // 頂部
@"UIViewContentModeBottom", // 底部
@"UIViewContentModeLeft", // 中間貼左
@"UIViewContentModeRight", // 中間貼右
@"UIViewContentModeTopLeft", // 貼左上
@"UIViewContentModeTopRight", // 貼右上
@"UIViewContentModeBottomLeft", // 貼左下
@"UIViewContentModeBottomRight", // 貼右下</pre>
24，宏定義檢測block是否可用
<pre>#define BLOCK_EXEC(block, ...) if (block) { block(VA_ARGS); };
// 宏定義之前的用法
if (completionBlock) {
completionBlock(arg1, arg2);
}
// 宏定義之后的用法
BLOCK_EXEC(completionBlock, arg1, arg2);</pre>
25，Debug欄打印時自動把Unicode編碼轉化成漢字
<pre>// 有時候我們在xcode中打印中文,會打印出Unicode編碼,還需要自己去一些在線網站轉換,有了插件就方便多了。
DXXcodeConsoleUnicodePlugin 插件</pre>
26，設置狀態欄文字樣式顏色
<pre>[[UIApplication sharedApplication] setStatusBarHidden:NO];
[[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent];</pre>
26，自動生成模型代碼的插件
<pre>
可自動生成模型的代碼，省去寫模型代碼的時間
ESJsonFormat-for-Xcode</pre>
27，iOS中的一些手勢
<pre>輕擊手勢（TapGestureRecognizer）
輕掃手勢（SwipeGestureRecognizer）
長按手勢（LongPressGestureRecognizer）
拖動手勢（PanGestureRecognizer）
捏合手勢（PinchGestureRecognizer）
旋轉手勢（RotationGestureRecognizer）</pre>
27，iOS 開發中一些相關的路徑
<pre>模擬器的位置:
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs
文檔安裝位置:
/Applications/Xcode.app/Contents/Developer/Documentation/DocSets
插件保存路徑:
~/Library/ApplicationSupport/Developer/Shared/Xcode/Plug-ins
自定義代碼段的保存路徑:
~/Library/Developer/Xcode/UserData/CodeSnippets/
如果找不到CodeSnippets文件夾，可以自己新建一個CodeSnippets文件夾。
證書路徑
~/Library/MobileDevice/Provisioning Profiles
</pre>
28，獲取 iOS 路徑的方法
<pre>獲取家目錄路徑的函數
NSString *homeDir = NSHomeDirectory();
獲取Documents目錄路徑的方法
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *docDir = [paths objectAtIndex:0];
獲取Documents目錄路徑的方法
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
NSString *cachesDir = [paths objectAtIndex:0];
獲取tmp目錄路徑的方法：
NSString *tmpDir = NSTemporaryDirectory();</pre>
29，字符串相關操作
<pre>去除所有的空格
[str stringByReplacingOccurrencesOfString:@" " withString:@""]
去除首尾的空格
[str stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
- (NSString *)uppercaseString; 全部字符轉為大寫字母
- (NSString *)lowercaseString 全部字符轉為小寫字母</pre>
30， CocoaPods pod install/pod update更新慢的問題
<pre>pod install --verbose --no-repo-update
pod update --verbose --no-repo-update
如果不加后面的參數，默認會升級CocoaPods的spec倉庫，加一個參數可以省略這一步，然后速度就會提升不少。</pre>
31，MRC和ARC混編設置方式
<pre>在XCode中targets的build phases選項下Compile Sources下選擇 不需要arc編譯的文件
雙擊輸入 -fno-objc-arc 即可
MRC工程中也可以使用ARC的類，方法如下：
在XCode中targets的build phases選項下Compile Sources下選擇要使用arc編譯的文件
雙擊輸入 -fobjc-arc 即可</pre>
32，把tableview里cell的小對勾的顏色改成別的顏色
<pre>_mTableView.tintColor = [UIColor redColor];</pre>
33，調整tableview的separaLine線的位置
<pre>tableView.separatorInset = UIEdgeInsetsMake(0, 100, 0, 0);
</pre>
34，設置滑動的時候隱藏navigation bar
navigationController.hidesBarsOnSwipe = Yes
35，自動處理鍵盤事件，實現輸入框防遮擋的插件
IQKeyboardManager
https://github.com/hackiftekhar/IQKeyboardManager
36，Quartz2D相關
<pre>圖形上下是一個CGContextRef類型的數據。
圖形上下文包含：
1，繪圖路徑（各種各樣圖形）
2，繪圖狀態（顏色，線寬，樣式，旋轉，縮放，平移）
3，輸出目標（繪制到什么地方去？UIView、圖片）
1，獲取當前圖形上下文
CGContextRef ctx = UIGraphicsGetCurrentContext();
2，添加線條
CGContextMoveToPoint(ctx, 20, 20);
3，渲染
CGContextStrokePath(ctx);
CGContextFillPath(ctx);
4，關閉路徑
CGContextClosePath(ctx);
5，畫矩形
CGContextAddRect(ctx, CGRectMake(20, 20, 100, 120));
6，設置線條顏色
[[UIColor redColor] setStroke];
7， 設置線條寬度
CGContextSetLineWidth(ctx, 20);
8，設置頭尾樣式
CGContextSetLineCap(ctx, kCGLineCapSquare);
9，設置轉折點樣式
CGContextSetLineJoin(ctx, kCGLineJoinBevel);
10，畫圓
CGContextAddEllipseInRect(ctx, CGRectMake(30, 50, 100, 100));
11，指定圓心
CGContextAddArc(ctx, 100, 100, 50, 0, M_PI * 2, 1);
12，獲取圖片上下文
UIGraphicsGetImageFromCurrentImageContext();
13，保存圖形上下文
CGContextSaveGState(ctx)
14，恢復圖形上下文
CGContextRestoreGState(ctx)</pre>
37，屏幕截圖
<pre> // 1. 開啟一個與圖片相關的圖形上下文
UIGraphicsBeginImageContextWithOptions(self.view.bounds.size,NO,0.0);
// 2. 獲取當前圖形上下文
CGContextRef ctx = UIGraphicsGetCurrentContext();
// 3. 獲取需要截取的view的layer
[self.view.layer renderInContext:ctx];
// 4. 從當前上下文中獲取圖片
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
// 5. 關閉圖形上下文
UIGraphicsEndImageContext();
// 6. 把圖片保存到相冊
UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);</pre>
37，左右抖動動畫
<pre>//1, 創建核心動畫
CAKeyframeAnimation *keyAnima = [CAKeyframeAnimation animation];
//2, 告訴系統執行什么動畫。
keyAnima.keyPath = @"transform.rotation";
keyAnima.values = @[@(-M_PI_4 /90.0 * 5),@(M_PI_4 /90.0 * 5),@(-M_PI_4 /90.0 * 5)];
// 3, 執行完之后不刪除動畫
keyAnima.removedOnCompletion = NO;
// 4, 執行完之后保存最新的狀態
keyAnima.fillMode = kCAFillModeForwards;
// 5, 動畫執行時間
keyAnima.duration = 0.2;
// 6, 設置重復次數。
keyAnima.repeatCount = MAXFLOAT;
// 7, 添加核心動畫
[self.iconView.layer addAnimation:keyAnima forKey:nil];</pre>
38，CALayer 的知識
<pre>CALayer 負責視圖中顯示內容和動畫
UIView 負責監聽和響應事件
創建UIView對象時，UIView內部會自動創建一個圖層（既CALayer）
UIView本身不具備顯示的功能，是它內部的層才有顯示功能.
CALayer屬性：
position 中點（由anchorPoint決定）
anchorPoint 錨點
borderColor 邊框顏色
borderWidth 邊框寬度
cornerRadius 圓角半徑
shadowColor 陰影顏色
contents 內容
opacity 透明度
shadowOpacity 偏移
shadowRadius 陰影半徑
shadowColor 陰影顏色
masksToBounds 裁剪</pre>
39，性能相關
<pre>1. 視圖復用,比如UITableViewCell,UICollectionViewCell.
- 數據緩存,比如用SDWebImage實現圖片緩存。
- 任何情況下都不能堵塞主線程，把耗時操作盡量放到子線程。
- 如果有多個下載同時并發，可以控制并發數。
- 在合適的地方盡量使用懶加載。
- 重用重大開銷對象，比如：NSDateFormatter、NSCalendar。
- 選擇合適的數據存儲。
- 避免循環引用。避免delegate用retain、strong修飾，block可能導致循環引用，NSTimer也可能導致內存泄露等。
- 當涉及到定位的時候，不用的時候最好把定位服務關閉。因為定位耗電、流量。
- 加鎖對性能有重大開銷。
- 界面最好不要添加過多的subViews.
- TableView 如果不同行高，那么返回行高，最好做緩存。
- Viewdidload 里盡量不要做耗時操作。</pre>
40，驗證身份證號碼
<pre>//驗證身份證號碼
-
(BOOL)checkIdentityCardNo:(NSString)cardNo
{
if (cardNo.length != 18) {
return NO;
}
NSArray codeArray = [NSArray arrayWithObjects:@"7",@"9",@"10",@"5",@"8",@"4",@"2",@"1",@"6",@"3",@"7",@"9",@"10",@"5",@"8",@"4",@"2", nil];
NSDictionary* checkCodeDic = [NSDictionary dictionaryWithObjects:[NSArray arrayWithObjects:@"1",@"0",@"X",@"9",@"8",@"7",@"6",@"5",@"4",@"3",@"2", nil] forKeys:[NSArray arrayWithObjects:@"0",@"1",@"2",@"3",@"4",@"5",@"6",@"7",@"8",@"9",@"10", nil]];NSScanner* scan = [NSScanner scannerWithString:[cardNo substringToIndex:17]];
int val;
BOOL isNum = [scan scanInt:&val] && [scan isAtEnd];
if (!isNum) {
return NO;
}
int sumValue = 0;for (int i =0; i
</pre>
41，響應者鏈條順序
<pre>1> 當應用程序啟動以后創建 UIApplication 對象
2> 然后啟動“消息循環”監聽所有的事件
3> 當用戶觸摸屏幕的時候, "消息循環"監聽到這個觸摸事件
4> "消息循環" 首先把監聽到的觸摸事件傳遞了 UIApplication 對象
5> UIApplication 對象再傳遞給 UIWindow 對象
6> UIWindow 對象再傳遞給 UIWindow 的根控制器(rootViewController)
7> 控制器再傳遞給控制器所管理的 view
8> 控制器所管理的 View 在其內部搜索看本次觸摸的點在哪個控件的范圍內（調用Hit test檢測是否在這個范圍內）
9> 找到某個控件以后(調用這個控件的 touchesXxx 方法), 再一次向上返回, 最終返回給"消息循環"
10> "消息循環"知道哪個按鈕被點擊后, 在搜索這個按鈕是否注冊了對應的事件, 如果注冊了, 那么就調用這個"事件處理"程序。（一般就是執行控制器中的"事件處理"方法）</pre>
42，使用函數式指針執行方法和忽略performSelector方法的時候警告
<pre>不帶參數的：
SEL selector = NSSelectorFromString(@"someMethod");
IMP imp = [_controller methodForSelector:selector];
void (*func)(id, SEL) = (void *)imp;
func(_controller, selector);
帶參數的：
SEL selector = NSSelectorFromString(@"processRegion:ofView:");
IMP imp = [_controller methodForSelector:selector];
CGRect (*func)(id, SEL, CGRect, UIView *) = (void *)imp;
CGRect result = func(_controller, selector, someRect, someView);
忽略警告：
pragma clang diagnostic push
pragma clang diagnostic ignored "-Warc-performSelector-leaks"
[someController performSelector: NSSelectorFromString(@"someMethod")]
pragma clang diagnostic pop
如果需要忽視的警告有多處，可以定義一個宏：
define SuppressPerformSelectorLeakWarning(Stuff)
do {
_Pragma("clang diagnostic push")
_Pragma("clang diagnostic ignored "-Warc-performSelector-leaks"")
Stuff;
_Pragma("clang diagnostic pop")
} while (0)
使用方法：
SuppressPerformSelectorLeakWarning(
[_target performSelector:_action withObject:self]
);
</pre>
43，UIApplication的簡單使用
<pre>--------設置角標數字--------
//獲取UIApplication對象
UIApplication *ap = [UIApplication sharedApplication];
//在設置之前, 要注冊一個通知,從ios8之后,都要先注冊一個通知對象.才能夠接收到提醒.
UIUserNotificationSettings *notice =
[UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeBadge categories:nil];
//注冊通知對象
[ap registerUserNotificationSettings:notice];
//設置提醒數字
ap.applicationIconBadgeNumber = 20;
--------設置聯網狀態--------
UIApplication *ap = [UIApplication sharedApplication];
ap.networkActivityIndicatorVisible = YES;</pre>
