iphone - 在截图之前隐藏 UIButton

Question

我需要截取应用程序的屏幕截图。有一个按钮可以触发它，但我不想让按钮出现在屏幕截图中。

我有以下代码:

- (IBAction) takePicture:(id) sender {
    button.hidden = YES;

    CGImageRef screen = UIGetScreenImage();
    UIImage* image = [UIImage imageWithCGImage:screen];
    CGImageRelease(screen);

    // Save the captured image to photo album
    UIImageWriteToSavedPhotosAlbum(image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
    button.hidden = NO;
}

但按钮仍然出现在屏幕截图中。我做错了什么？

Answer 1

我认为你在 runloop 可以刷新 View 之前捕获屏幕(即在它可以隐藏按钮之前)

你应该试着把你的代码改成这样:

- (IBAction) takePicture:(id) sender {
    button.hidden = YES;
    [self performSelector:@selector(takeScreenShot) withObject:nil afterDelay:0.1];                    
}

- (void)takeScreenShot {
    CGImageRef screen = UIGetScreenImage();
    UIImage* image = [UIImage imageWithCGImage:screen];
    CGImageRelease(screen);

    // Save the captured image to photo album
    UIImageWriteToSavedPhotosAlbum(image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
    button.hidden = NO;

}

这应该是运行循环移除按钮后的截图。