UIScreenEdgePanGestureRecognizer：顶部和底部边缘

Question

这是可能实现从顶部（或下）边缘UIScreenEdgePanGestureRecognizer处理事件？

UIScreenEdgePanGestureRecognizer *gestureRecognizer = [[UIScreenEdgePanGestureRecognizer alloc] initWithTarget:self action:@selector(userDidPan:)]; 
gestureRecognizer.edges = UIRectEdgeTop; // UIRectEdgeBottom 
[self.view addGestureRecognizer:gestureRecognizer]; 

问候。

Answer 1

状态栏必须隐藏起来才能使用。在您的UIViewController中，覆盖 (BOOL)prefersStatusBarHidden()并返回YES。

但是在ios8中（没有在ios7中测试）。当设备方向为左侧风景时，我无法识别底部手势，并且在设备方向为风景右侧时无法识别顶部手势。我正在调查，但看起来像一个bug。

Answer 2

顶部和底部边缘手势从屏幕边缘触发20像素。

默认情况下，状态栏是可见的，并占据前20像素的空间，因此您必须隐藏状态栏以使用这些（顶部/机器人）UIScreenEdgePanGestureRecognizers，否则委托不会被调用。

第一步：

步骤2：

添加以下代码：

ViewController.h

@interface ViewController : UIViewController<UIGestureRecognizerDelegate> 

ViewController.m

- (void)viewDidLoad 
{ 
[super viewDidLoad]; 

UIScreenEdgePanGestureRecognizer *topEdgeGesture = [[UIScreenEdgePanGestureRecognizer alloc] initWithTarget:self action:@selector(handleTopEdgeGesture:)]; 
topEdgeGesture.edges = UIRectEdgeTop; //UIRectEdgeBottom 
topEdgeGesture.delegate = self; 
[self.view addGestureRecognizer:topEdgeGesture]; 




    } 
    - (BOOL) prefersStatusBarHidden 
    { 
    return YES; 
    } 

    - (void)handleTopEdgeGesture:(UIScreenEdgePanGestureRecognizer *)gesture 
    { 
    NSLog(@"TOP"); 
    } 

斯威夫特：

class ViewController: UIViewController,UIGestureRecognizerDelegate { 

override func viewDidLoad() 
{ 
    super.viewDidLoad() 


    var edgeGesture : UIScreenEdgePanGestureRecognizer = UIScreenEdgePanGestureRecognizer(target: self, action:"handleTopEdgeGesture:") 
    edgeGesture.edges = UIRectEdge.Top 
    edgeGesture.delegate = self 
    self.view.addGestureRecognizer(edgeGesture) 

} 


func handleTopEdgeGesture(gesture:UIScreenEdgePanGestureRecognizer) 
{ 
    println("TOP") 
} 


override func prefersStatusBarHidden() -> Bool 
{ 
    return true 
} 


override func didReceiveMemoryWarning() 
{ 
    super.didReceiveMemoryWarning() 
    // Dispose of any resources that can be recreated. 
} 


}