iPhone編程中的手勢識別

Question

如何在使用cocos2d的iPhone編程中做簡單的手勢識別？當你滑動屏幕時，手勢僅僅意味着手指的路徑。

我想在用戶觸摸屏幕時使用一些簡單的手勢，如線條（八個方向），圓形，正方形和其他手勢，如'V'，'^'，'<'，'> 」。有沒有簡單的方法可以快速識別用戶輸入？

Answer 1

iOS SDK 3.2引入了UIGestureRecognizer類來簡單識別簡單的手勢。

的UIGestureRecognizer的具體子類如下：

UITapGestureRecognizer 
UIPinchGestureRecognizer 
UIRotationGestureRecognizer 
UISwipeGestureRecognizer 
UIPanGestureRecognizer 
UILongPressGestureRecognizer 

如果你需要認識更多的手勢，你可以嘗試sublassing UIGestureRecognizer，例如「對勾」的手勢。請參閱Apple的參考文檔中的子類註釋。

Answer 2

請嘗試以下鏈接http://www.techotopia.com/index.php/An_iPhone_iOS_4_Gesture_Recognition_Tutorial_(Xcode_4） 描述手勢識別。

，並嘗試爲它：

UISwipeGestureRecognizer *recognizer; 

recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeFrom:)]; 
[recognizer setDirection:(UISwipeGestureRecognizerDirectionRight)]; 
[[self view] addGestureRecognizer:recognizer]; 
[recognizer release]; 

recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeFrom:)]; 
[recognizer setDirection:(UISwipeGestureRecognizerDirectionUp)]; 
[[self view] addGestureRecognizer:recognizer]; 
[recognizer release]; 

recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeFrom:)]; 
[recognizer setDirection:(UISwipeGestureRecognizerDirectionDown)]; 
[[self view] addGestureRecognizer:recognizer]; 
[recognizer release]; 

recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeFrom:)]; 
[recognizer setDirection:(UISwipeGestureRecognizerDirectionLeft)]; 
[[self view] addGestureRecognizer:recognizer]; 
[recognizer release];