Question

我遇到一个简单的动画问题。我有一个UIImageView和一个隐形按钮。当按下该按钮时，图像全屏显示，当用户按下全屏时，它返回。这很好。问题是当图像调整大小后，界面被阻止（它不会崩溃）它只会阻止所有用户交互。虽然我的理论与视图层次结构有关，但我无法看出问题出在哪里......

以下是相关动画的完整代码。

- (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imageButton而不删除方法imageButtonPressed中创建的那个。

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

Answer 2

你最好使用

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

将UIViewAnimationOptions设置为UIViewAnimationOptionAllowUserInteraction

这不会阻止你的用户界面。

动画后为什么用户界面被阻止？

2 个答案: