UIScreenEdgePanGestureRecognizer：頂部和底部邊緣

Question

這是可能實現從頂部（或下）邊緣UIScreenEdgePanGestureRecognizer處理事件？

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

問候。

Answer 1

狀態欄必須隱藏起來才能使用。在您的UIViewController中，覆蓋 (BOOL)prefersStatusBarHidden()並返回YES。

但是在ios8中（沒有在ios7中測試）。當設備方向爲左側風景時，我無法識別底部手勢，並且在設備方向爲風景右側時無法識別頂部手勢。我正在調查，但看起來像一個bug。

Answer 2

頂部和底部邊緣手勢從屏幕邊緣觸發20像素。

默認情況下，狀態欄是可見的，並佔據前20像素的空間，因此您必須隱藏狀態欄以使用這些（頂部/機器人）UIScreenEdgePanGestureRecognizers，否則委託不會被調用。

第一步：

步驟2：

添加以下代碼：

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. 
} 


}