实现一个截图分享的功能

 

- (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);     }