我正在尝试通过具有每个灯光坐标的 CGRect 数组来实现城市灯光动画。然后围绕这些 CGRect 创建 UIView。此逻辑(感谢 Darren 帮助处理此逻辑)工作正常，但在动画完成后，屏幕上的所有其他元素(UIButtons、Sliders、其他 UIImageViews 等)都无法访问。甚至我的滑动手势也没有响应。在动画之前和期间，所有元素都响应良好，但是一旦动画完成，它们就都变得不可访问了。我还尝试了 [UIView bringSubviewToFront:] 将一些元素放在前面，看看是否有助于使它们易于访问，但没有帮助。我认为这不是问题，因为即使我尝试通过将它们发送到后台来创建灯光 View [self.view sendSubviewToBack:light]; 动画完成后一切都变得无法访问。

如果有人可以帮助/建议我缺少什么，我将不胜感激。

这是我的代码逻辑和城市灯光动画的相应场景。 rects & lits 是ivars。

- (void)viewDidLoad {
    pageCount=5;
    AVAudioSession * audioSession = [AVAudioSession sharedInstance];
    //Setup the audio session
    //...
    pageNum=1;
    //put imageviews in place
    //...
    //load a page
    [self loadPage];
    [self loadAudio];

    [self cityLightsSetUp];
    [super viewDidLoad];
}


-(void)loadPage{
    //Logic to load page...    
    /...
    if (pageNum == 3){
      [self startCityLights];
    }
}


- (void)cityLightsSetUp
{
    rects = [[NSMutableArray alloc] init];
    lit = [[NSMutableArray alloc] init];
    [rects addObject:[NSValue valueWithCGRect:CGRectMake(58, 217, 10, 10)]];
    [rects addObject:[NSValue valueWithCGRect:CGRectMake(71, 217, 10, 10)]];
    [rects addObject:[NSValue valueWithCGRect:CGRectMake(84, 217, 10, 10)]];
    [rects addObject:[NSValue valueWithCGRect:CGRectMake(97, 217, 10, 10)]];

    [rects addObject:[NSValue valueWithCGRect:CGRectMake(58, 231, 10, 10)]];
    [rects addObject:[NSValue valueWithCGRect:CGRectMake(71, 231, 10, 10)]];
    [rects addObject:[NSValue valueWithCGRect:CGRectMake(84, 231, 10, 10)]];
    [rects addObject:[NSValue valueWithCGRect:CGRectMake(97, 231, 10, 10)]];

    [rects addObject:[NSValue valueWithCGRect:CGRectMake(58, 245, 10, 10)]];
    [rects addObject:[NSValue valueWithCGRect:CGRectMake(71, 245, 10, 10)]];
    [rects addObject:[NSValue valueWithCGRect:CGRectMake(84, 245, 10, 10)]];
    [rects addObject:[NSValue valueWithCGRect:CGRectMake(97, 245, 10, 10)]];

    [rects addObject:[NSValue valueWithCGRect:CGRectMake(58, 258, 10, 10)]];
    [rects addObject:[NSValue valueWithCGRect:CGRectMake(71, 258, 10, 10)]];
}

- (void)startCityLights
{
    [self lightRandomLight];
    [self performSelector:@selector(switchOffRandomLight) withObject:nil afterDelay:1.0];
}

- (void)lightRandomLight
{
    BOOL escape = NO;
    int rand;

    while (!escape) {
        BOOL alreadyLit = NO;
        rand = arc4random() % [rects count];
        // Check if already lit
        for (UIView *view in lit) {
            CGRect litRect = view.frame;
            CGRect ranRect = [[rects objectAtIndex:rand] CGRectValue];
            if (CGRectContainsRect(litRect, ranRect)) {
                alreadyLit = YES;
            }
        }

        if (!alreadyLit) {
            UIView *light = [[UIView alloc] initWithFrame:[[rects objectAtIndex:rand] CGRectValue]];
            light.backgroundColor = [UIColor orangeColor];
            [lit addObject:light];
            [self.view addSubview:light];
            //[self.view sendSubviewToBack:light];
            escape = YES;
        }
    }

    [self performSelector:@selector(lightRandomLight) withObject:nil afterDelay:0.2];
}

- (void)switchOffRandomLight
{
     NSLog(@"switchOffRandomLight");
    int rand = arc4random() % [lit count];
    UIView *light = [lit objectAtIndex:rand];
    [lit removeObject:light];
    [light removeFromSuperview];

    [self performSelector:@selector(switchOffRandomLight) withObject:nil afterDelay:0.5];
}

最佳答案

看来，一旦所有灯都点亮，while 循环就会不断运行，试图获得一个未点亮的随机数。这将阻塞主线程。

您只需检查方法开始时所有灯是否亮起，如果没有则继续。

在 lightRandomLight 方法的底部，替换

[self performSelector:@selector(lightRandomLight) withObject:nil afterDelay:0.2];

与

if ([lit count] != [rects count]) {
    [self performSelector:@selector(lightRandomLight) withObject:nil afterDelay:0.2];
} else {
    [NSObject cancelPreviousPerformRequestsWithTarget:self];
}

当所有灯都点亮时它会停止。

关于ios - 动画完成后，所有 UIElement 都变得不可访问，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/12478685/