UIScreenEdgePanGestureRecognizer：顶部和底部边缘

Question

是否可以使 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像素。

默认情况下，状态栏为Visible，占据前20个像素的空间，因此您必须隐藏状态栏才能使用这些（top / bot）UIScreenEdgePanGestureRecognizers，否则代理不会被调用。

第1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");
   }

<强>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.
}


}

Answer 2

状态栏必须隐藏才能正常工作。在UIViewController中，覆盖 (BOOL)prefersStatusBarHidden()并返回YES。

然而在ios8中（没有在ios7中测试）。我有一些问题，当设备方向为横向左侧时未识别到底部手势（当设备方向为横向右侧时无法识别顶部手势）。我正在调查，但对我来说看起来像个错误。