IOS开发之截图(snapshot picture)

最近要实现一个截图分享的功能，开始是丈二和尚摸不着头脑，后来一查还挺简单的。

写个函数就搞定：

- (UIImage *) captureScreen {    UIWindow *keyWindow = [[UIApplication sharedApplication] keyWindow];    CGRect rect = [keyWindow bounds];    UIGraphicsBeginImageContext(rect.size);    CGContextRef context = UIGraphicsGetCurrentContext();    [keyWindow.layer renderInContext:context];       UIImage *img = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();    return img;}

如果要保存到相册:

- (void)saveScreenshotToPhotosAlbum:(UIView *)view     {        UIImageWriteToSavedPhotosAlbum([self captureScreen], nil, nil, nil);    }