iOS如何实现捕捉截屏事件并展示截图效果
小编给大家分享一下iOS如何实现捕捉截屏事件并展示截图效果,相信大部分人都还不怎么了解,因此分享这篇文章给大家参考一下,希望大家阅读完这篇文章后大有收获,下面让我们一起去了解一下吧!
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现在很多APP开始支持用户截屏后,主动获取截图并弹出分享视图,这样用户就不用去相册去找了,感觉体验不错,今天就分享一下 截屏开发的心得,希望能帮助iOS的朋友。
iOS7之后,苹果开放出一个通知:UIApplicationUserDidTakeScreenshotNotification,截屏时系统就会发出这个通知,需要你注册这个通知,就能捕捉到截屏图片。
下面的代码,实现的是用户截屏后,捕获到截屏图片,展示出来:
//注册截屏通知
[[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"); //获取截屏图片 UIImage *image = [UIImage imageWithData:[self imageDataScreenShot]]; //显示图片 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:@"分享给好友" 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]; }); }
获取截屏图片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); }
按钮点击事件:
-(void)shareBtn:(UIButton *)sender{ /* 分享代码 */ }
以上就是截屏后的事例代码,最后附上效果图:
以上是“iOS如何实现捕捉截屏事件并展示截图效果”这篇文章的所有内容,感谢各位的阅读!相信大家都有了一定的了解,希望分享的内容对大家有所帮助,如果还想学习更多知识,欢迎关注创新互联行业资讯频道!
本文名称:iOS如何实现捕捉截屏事件并展示截图效果
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