ios - 如何使用标签务实地删除按钮

Question

我将按钮 subView 添加到我单击的每一行。每次单击不同的行并将按钮 subview 添加到单击的另一行时，我都会尝试删除按钮 subview 。

我的问题在哪里？它正在将 subView 添加到每一行而不删除它们中的任何一个。

if (sender.tag == 212)
  {
    myButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    myButton2 = [UIButton buttonWithType:UIButtonTypeRoundedRect];

    //Debug shows that every-time myButton&myButton2 hasn't tag??

    if (myButton2.tag != 0  && myButton.tag != 0)
    {
        [myButton removeFromSuperview];
        [myButton2 removeFromSuperview];
    }

    UITableViewCell *cell = (id)sender.superview.superview.superview;

    CGPoint center= sender.center;
    CGPoint rootViewPoint = [sender.superview convertPoint:center toView:commonTable.table];
    NSIndexPath *indexPath1 = [commonTable.table indexPathForRowAtPoint:rootViewPoint];

    itemdata1 = [itemList objectAtIndex:indexPath1.row];

    if (closeManager) [closeManager release];

    CGFloat __y = commonTable.y + commonTable.table.y - commonTable.table.contentOffset.y + cell.height*indexPath1.row + sender.y;
    CGFloat __x = commonTable.x + commonTable.table.x + sender.x;
    CGRect layerBox1 = CGRectMake(618, __y, 90, sender.height+3);
    CGRect layerBox2 = CGRectMake(888, __y, 94, sender.height+3);

    NSLog(@"%f and %f", __x, __y);

    myButton.frame = layerBox1;
    [[myButton layer] setBorderWidth:2.0f];
    myButton.layer.borderColor = [UIColor redColor].CGColor;
    [myButton addTarget:self action:@selector(func1:) forControlEvents:UIControlEventTouchUpInside];

    myButton2.frame = layerBox2;
    [[myButton2 layer] setBorderWidth:2.0f];
    [myButton2 addTarget:self action:@selector(func2:) forControlEvents:UIControlEventTouchUpInside];
    myButton2.layer.borderColor = [UIColor redColor].CGColor;

    [self addSubview:myButton];
    [self addSubview:myButton2];

    myButton.tag = myButton2.tag = 666;

}

为 Bhumeshwer katre 编辑:

    if (myButton&&myButton2)
    {
        [myButton removeFromSuperview];
        [myButton2 removeFromSuperview];
    }

    //Other variables 

    if(!myButton){
        myButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
        myButton.frame = layerBox1;
        [[myButton layer] setBorderWidth:2.0f];
        myButton.layer.borderColor = [UIColor redColor].CGColor;
        [myButton addTarget:self action:@selector(func1:) forControlEvents:UIControlEventTouchUpInside];
        myButton.tag = 666;
        [self addSubview:myButton];
    }

Answer 1

不要每次像这样创建按钮

在这里，您每次都在创建 UIButton 的新实例

myButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
myButton2 = [UIButton buttonWithType:UIButtonTypeRoundedRect];

而你正在这样做

    //Debug shows that every-time myButton&myButton2 hasn't tag??
        if (myButton2.tag != 0  && myButton.tag != 0)
        {
            [myButton removeFromSuperview];
            [myButton2 removeFromSuperview];
        }
   //It will just remove new instance of UIButton and no more your UIButton will be there on UIView.

试试这样

    if(!myButton){
        myButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    }
    if(!myButton2) {
        myButton2 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    }

//Don't remove your button just change frame

如果您仍想删除按钮，请先删除

   [myButton removeFromSuperview];
   [myButton2 removeFromSuperview];

 //then create new instance of button