为什么动画后用户界面会被阻塞？

Question

我对简单的动画有疑问。我有一个 UIImageView 和它上面的一个不可见的按钮。当按下此按钮时，图像将全屏显示，当用户按下全屏时，图像将返回。效果很好。问题是，当图像大小调整回来时，界面会被阻止（它不会崩溃），它只会阻止所有用户交互。尽管我有与视图层次结构相关的理论，但我看不出问题出在哪里......

这是有问题的动画的完整代码。

- (IBAction) imageButtonPressed {

NSLog(@"Entered imageButtonPressed method");

imageFullscreenView = [[UIImageView alloc] 
                       initWithFrame:CGRectMake(8, 72, 72, 72)];
[imageFullscreenView setImage:[self.coolView image]];
[imageFullscreenView setContentMode:UIViewContentModeScaleAspectFit];
UIWindow *mainWindow = [[UIApplication sharedApplication] keyWindow];
[mainWindow addSubview:imageFullscreenView];

// With Concurrent Block Programming:
[UIView animateWithDuration:0.5 animations:^{
        [imageFullscreenView setFrame:CGRectMake(0, 0, 320, 480)];
        imageFullscreenView.transform = CGAffineTransformMakeScale(1, 1); 
        imageButton = [[[UIButton alloc] 
                       initWithFrame:CGRectMake(0, 0, 320, 480)] autorelease];

    [[[UIApplication sharedApplication] keyWindow] addSubview:imageButton];
    [[[UIApplication sharedApplication] keyWindow] 
                                        addSubview:imageFullscreenView];
    } completion: ^(BOOL finished) {
        NSLog(@"entered First animation");
        [self animationDidStop:@"Expand" finished:YES context:nil];
    }];

}

- (void) animationDidStop:(NSString *) animationID finished:(BOOL) 
                                 finished context:(void *)context {

NSLog(@"Entered animationDidStop");
NSLog(@"animationID: %@", animationID);
if ([animationID isEqualToString:@"Expand"]) {
    NSLog(@"Entered First if");
    NSLog(@"imageButton enabled: %d", self.imageButton.enabled);
    NSLog(@"coolButton enabled: %d", coolButton.enabled);
    NSLog(@"uncoolButton enabled: %d", uncoolButton.enabled);
    NSLog(@"reportButton enabled: %d", self.reportButton.enabled);
    imageButton.enabled = YES;
    imageButton = [[[UIButton alloc] 
                        initWithFrame:CGRectMake(0, 0, 320, 480)] autorelease];
    [imageButton addTarget:self 
                         action:@selector(didViewFullscreen:) 
                         forControlEvents:UIControlEventTouchDown];
    [[[UIApplication sharedApplication] keyWindow] addSubview:imageButton];
    imageButtonPressed = NO;
} else {

}
}

- (void) didViewFullscreen: (id) selector {

NSLog(@"Entered didViewFullscreen");
[imageButton removeFromSuperview];
[UIView animateWithDuration:0.5 animations:^{
    [imageFullscreenView setFrame:CGRectMake(8, 72, 72, 72)];
} completion: ^(BOOL finished){
    NSLog(@"FINISHED");
    //NSLog(@"imageButton enabled: %d", self.imageButton.enabled);
    NSLog(@"coolButton enabled: %d", coolButton.enabled);
    NSLog(@"uncoolButton enabled: %d", uncoolButton.enabled);
    NSLog(@"reportButton enabled: %d", self.reportButton.enabled);
    //[imageFullscreenView setFrame:CGRectMake(20, 72, 280, 192)];
    imageFullscreenView.transform = CGAffineTransformMakeScale(1, 1);
    [imageFullscreenView removeFromSuperview];
    imageButton = [[[UIButton alloc] 
                      initWithFrame:CGRectMake(20, 72, 280, 192)] autorelease];
    [imageButton addTarget:self 
                         action:@selector(imageButtonPressed) 
                         forControlEvents:UIControlEventTouchUpInside];
    [imageButton setImage:nil forState:UIControlStateNormal];
    [[[UIApplication sharedApplication] keyWindow] addSubview:self.imageButton];        
}];

}

Answer 1

在您的方法 animationDidStop:finished:context: 中，您再次创建了一个 imageButton，而没有删除在方法 imageButtonPressed 中创建的按钮。

[imageButton removeFromSuperview] 在分配另一个之前将解决问题。

Answer 2

你最好使用

• (void)animateWithDuration:(NSTimeInterval)持续时间
  延迟：(NSTimeInterval)延迟
  选项：(UIViewAnimationOptions)选项
  动画:(void (^)(void))动画
  完成:(无效 (^)(BOOL
  完成））完成

将 UIViewAnimationOptions 设置为 UIViewAnimationOptionAllowUserInteraction

完成，这不会阻止您的 UI。