摩拜單車、微信的截屏就做的比較人性化。
現在很多APP開始支持用戶截屏后，主動獲取截圖并彈出分享視圖，這樣用戶就不用去相冊去找了，感覺體驗不錯，今天就分享一下 截屏開發的心得，希望能幫助iOS的朋友。
iOS7之后，蘋果開放出一個通知：UIApplicationUserDidTakeScreenshotNotification，截屏時系統就會發出這個通知，需要你注冊這個通知，就能捕捉到截屏圖片。
下面的代碼，實現的是用戶截屏后，捕獲到截屏圖片，展示出來：
//注冊截屏通知
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(getScreenShot:) name:UIApplicationUserDidTakeScreenshotNotification object:nil];
截屏后捕捉到事件：
- (void)getScreenshot:(NSNotification *)notification{ NSLog(@"捕捉截屏事件"); //獲取截屏圖片 UIImage *image = [UIImage imageWithData:[self imageDataScreenShot]]; //顯示圖片 UIImageView *imgV = [[UIImageView alloc]initWithImage:image]; imgV.frame = [UIScreen mainScreen].bounds; UIView *backView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT)]; backView.backgroundColor = [[UIColor grayColor] colorWithAlphaComponent:0.8]; UIButton *shareBtn = [UIButton buttonWithType:UIButtonTypeSystem]; shareBtn.titleLabel.font = [UIFont systemFontOfSize:17.0]; [shareBtn setTintColor:[UIColor whiteColor]]; shareBtn.frame = CGRectMake(SCREEN_WIDTH/5,SCREEN_HEIGHT ,SCREEN_WIDTH*3/5,50); [shareBtn.layer setMasksToBounds:YES]; [shareBtn.layer setBorderWidth:1]; shareBtn.layer.cornerRadius = 6; [shareBtn setTitle:@"分享給好友" forState:UIControlStateNormal]; shareBtn.backgroundColor = [SouFunIMUtilityHelper colorWithHexString:@"#B22222"]; [shareBtn addTarget:self action:@selector(shareBtn:) forControlEvents:UIControlEventTouchUpInside]; [backView addSubview:imgV]; [backView addSubview:shareBtn]; UIWindow *window = [UIApplication sharedApplication].keyWindow; [window addSubview:backView]; [UIView animateWithDuration:1.0 animations:^{ imgV.transform = CGAffineTransformMakeScale(0.8, 0.8); shareBtn.transform = CGAffineTransformMakeTranslation(0, -50); }]; //3秒后消失 dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(3 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{ [backView removeFromSuperview]; });}獲取截屏圖片data：
- (NSData *)imageDataScreenShot{ CGSize imageSize = CGSizeZero; imageSize = [UIScreen mainScreen].bounds.size; UIGraphicsBeginImageContextWithOptions(imageSize, NO, 0); CGContextRef context = UIGraphicsGetCurrentContext(); for (UIWindow *window in [[UIApplication sharedApplication] windows]) { CGContextSaveGState(context); CGContextTranslateCTM(context, window.center.x, window.center.y); CGContextConcatCTM(context, window.transform); CGContextTranslateCTM(context, -window.bounds.size.width * window.layer.anchorPoint.x, -window.bounds.size.height * window.layer.anchorPoint.y); if ([window respondsToSelector:@selector(drawViewHierarchyInRect:afterScreenUpdates:)]) { [window drawViewHierarchyInRect:window.bounds afterScreenUpdates:YES]; } else { [window.layer renderInContext:context]; } CGContextRestoreGState(context); } UIImage *image = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return UIImagePNGRepresentation(image);}按鈕點擊事件：
-(void)shareBtn:(UIButton *)sender{/* 分享代碼 */}以上就是截屏后的事例代碼，最后附上效果圖：
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持武林網。
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