iPhone - 觸摸區域檢測

Question

我正在創建一個應用程序，允許用戶在線路或路徑上方觸摸。我想做一些事情，像用戶應該能夠利用該行的20個像素。我搜索了很多，但什麼都沒找到。

Answer 1

以下是我的一個程序中的一段代碼：在這裏我做了類似的事情。無論用戶在屏幕上點按哪個位置都會顯示圖像。我已將屏幕限制在某些區域，只有在龍頭將被註冊的地方。希望這可以幫助你：！

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


    UITouch *touch = [[event allTouches] anyObject]; 
    CGPoint location = [touch locationInView:touch.view]; 
    image=[UIImage imageNamed:@"anyImage.gif"]; 
    newView = [[UIImageView alloc]initWithImage:image]; 
    if (location.y<117 || location.y>354) 
    { 
     newView.frame = CGRectMake (location.x, location.y,87,70); 
     newView.center=location; 
     [self addSubview:newView]; 

    } 

    if (location.y<90) 
    { 
     if(location.y>85) 
     { 
      if (location.x>133 || location.x<183) 
      { 

       [self shakeA]; //A method shakeA is called 

      } 
     } 
    } 
    else if (location.y<360) 
    { 
     if (location.y>354) 
     { 
      if (location.x>133 || location.x<183) 
      {  
       [self shakeB]; // Method shakeB called 

      } 
     } 
    } 
}