價值的初始化過程中存儲到「觸摸」是從來沒有讀過

Question

我是新iPhone商發展和我有一個follwing澄清

- (void)touchesEnded: (NSSet *)touches withEvent: (UIEvent *)event 
//----------------------------------------------------------------------- 
{ 
    if(!mouseSwiped) 
    { 
     UITouch *touch = [[event allTouches] anyObject]; 

     // Enumerates through all touch object 
     for (touch in touches) 
     { 
      // Sends to the dispatch method, which will make sure the appropriate subview is acted upon 
      [self dispatchTouchAtPoint:[touch locationInView:self.view] :touches :nil];  
     } 
    } 
} 

，當我運行靜態分析儀對我的申請，我得到以下

Value stored to 'touch' during its initialization is never read 

我沒有什麼意思......

請指引我出去......

Answer 1

要做for each循環，必須在括號內聲明'touch'，如下所示：

for (UITouch *touch in [touches allObjects]) { 
      // Sends to the dispatch method, which will make sure the appropriate subview is acted upon 
      [self dispatchTouchAtPoint:[touch locationInView:self.view] :touches :nil];  
}