在iOS設備上處理觸摸事件

Question

我正在探索在iOS設備上處理觸摸事件的方式。我參考了這本書：iOS Open Application Development。在此基礎上，我重寫了mouseDown，mouseUp方法，並簡單地在一個警告框中顯示座標。但是，重寫的方法永遠不會被調用。以下是從UIView派生的newView類的代碼：

-(void) _mouseDown: (GSEventRef) event{ 
CGPoint point =GSEventGetLocationInWindow(event); 
UIAlertView* alert; 
NSString* alertString =[NSString stringWithFormat: @"%f %f", point.x, point.y]; 
alert = [[UIALertView alloc] initWithTitle:@"Success" message:alertString delegate:self cancelButtonTitle:@"OK" otherButtonTitles: nil]; 
[alert show]; 
} 

-(BOOL) canHandleGestures{ 
return YES; 
} 

是否有我遺失的任何部分？另外，是否有另外一種獲取觸摸事件信息並處理它們的方法？

Answer 1

更好的起點就在這裏： https://developer.apple.com/library/ios/documentation/EventHandling/Conceptual/EventHandlingiPhoneOS/multitouch_background/multitouch_background.html

這些都是你可以在UIView子類覆蓋的方法：

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event; 
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event; 
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event; 
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event 

Answer 2

您可以使用：

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {} 

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {} 

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {} 

- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event {} 

用於獲取觸摸來自UIView子類的事件。

Answer 3

你必須使用gesturerecognizer（如uitapgesturerecognizer，uiswipegesturerecognizer或UITouch events）