UIImageView處理拖動系統

Question

我有一個圖像，並通過拖動，取決於如果我左或右觸摸它擴展。例如，編輯軟件視頻/音頻句柄。 奇怪的是，我的問題是它在左邊（有位置/大小系統），但不在右邊。在右側，當我拖動圖像以指數形式擴展時。

這是我使用的代碼：

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

    UITouch *touch = [[event allTouches] anyObject]; 
    if ([touch view] == handlesImg) { 

     UITouch *touch = [[event allTouches] anyObject]; 
     locationOne = [touch locationInView:touch.view]; 
     //Left 
     if (locationOne.x < 12) { 

      dragTimeLineInt = 1; 

     } 
     //Right 
     else if (locationOne.x > handlesImg.frame.size.width -12) { 

     dragTimeLineInt = 2; 


     } 
    } 
} 

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

    [super touchesMoved:touches withEvent:event]; 

    CGPoint pt = [[touches anyObject] locationInView:handlesImg]; 
    CGRect frame = [handlesImg frame]; 

    float xSize = frame.size.width; 
    float xPos = frame.origin.x; 

    switch (dragTimeLineInt) { 
     case 1: //Left 

     xSize -= pt.x -locationOne.x; 
     xPos += pt.x - locationOne.x; 
     [handlesImg setFrame:CGRectMake(xPos, 0, xSize, 40)]; 

     break; 

    case 2: //Right 
     xSize += pt.x -locationOne.x; 
     [handlesImg setFrame:CGRectMake(xPos, 0, xSize, 40)]; 

     break; 

    default: 
     break; 
    } 
} 

非常感謝！

Answer 1

不知道這是否有幫助...但在-touchesMoved:withEvent:方法中查看您的第二種情況聲明，我注意到您沒有更新xPos，如同您在第一種情況聲明中所做的那樣。那是故意的嗎？