Question

我有简单的视图控制器，我使用此代码添加此控制器，如窗口的子视图：

UIWindow *window = [UIApplication sharedApplication].keyWindow;
if (!window)
window = [[UIApplication sharedApplication].windows objectAtIndex:0];

self.view.alpha = 0.0;
self.view.userInteractionEnabled = YES;
[window addSubview:self.view];

[self.view addGestureRecognizer:[[UITapGestureRecognizer alloc]    initWithTarget:self action:@selector(closeTriggered:)]];

[UIView animateWithDuration:0.5 delay:0 options:UIViewAnimationOptionAllowUserInteraction animations:^{
  self.view.alpha = 1.0;
    }completion:nil];

但是当我点击这个视图时 - 没有任何反应。即使是事件触摸开始：也没有被调用。

UPD：上面的代码是 - （void）show方法。我想在所有控制器上方显示一个控制器。在FirstViewController中，我创建了CustonAlertViewController的实例：

CustomAlertViewController *alertVC = [[CustomAlertViewController alloc]init];
[alertVC show];

在CustomAlertViewController中，我在顶部显示show方法，在viewDidLoad方法中显示：

self.view.backgrondColor = [UIColor greenColor];

Answer 1

隐藏的视图（以及等同于alpha == 0.0的视图）不响应触摸。如果您需要完全透明的视图，请将alpha保留为＆gt; 0.0，并说...

self.view.backgroundColor = [UIColor clearColor];

或者，指定非零alpha。

编辑是的，CustomAlertViewController实例在调用show后立即被释放。执行分配的视图控制器需要具有强大的属性来保持警报，

@property(nonatomic,strong) CustomAlertViewController *alertVC;

并添加......

CustomAlertViewController *alertVC = [[CustomAlertViewController alloc]init];
self.alertVC = alertVC;
[alertVC show];

这不会试图解决超出此问题范围的一些潜在问题（例如轮换，或在完成警报时干净地恢复）。

Answer 2

//尝试这样，你需要给出一些触摸

  UITapGestureRecognizer *gesture = [[UITapGestureRecognizer alloc]   initWithTarget:self action:@selector(closeTriggered:)];
 gesture.numberOfTapsRequired = 1;
        gesture.numberOfTouchesRequired = 1;
[self.view addGestureRecognizer:gesture];

Answer 3

您已将UITapGestureRecognizer设置在addSubview后窗口。像：

您一直在这样做

//...
[window addSubview:self.view];

[self.view addGestureRecognizer:[[UITapGestureRecognizer alloc]    initWithTarget:self action:@selector(closeTriggered:)]];
//...

试试这个

在UITapGestureRecognizer之前设置addSubview。请务必将UIGestureRecognizerDelegate添加到ViewController

self.view.alpha = 0.2;
self.view.userInteractionEnabled = YES;
UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(closeTriggered:)];
tapGesture.numberOfTapsRequired = 1;
[tapGesture setDelegate:self];
[self.view addGestureRecognizer:tapGesture];

// After you add your self.view to window
[window addSubview:self.view];

我希望这可以帮到你。

UIView没有回应接触

3 个答案: