ios - UIScreenEdgePanGestureRecognizer : top and bottom edges

Question

这是否可能使 UIScreenEdgePanGestureRecognizer 处理来自顶部(或底部)边缘的事件？

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

问候。

Answer 1

顶部和底部边缘手势从屏幕边缘触发 20 个像素。

默认情况下，状态栏是可见的并占用前 20 个像素的空间，因此您必须隐藏状态栏才能使用这些(顶部/机器人)UIScreenEdgePanGestureRecognizers，否则委托(delegate)不会被调用。

第一步:

第 2 步:

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");
   }

swift :

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.
}


}