UIButton 在自定义单元格中更改

Posted 2023-03-04

【中文标题】UIButton 在自定义单元格中更改

【英文标题】：UIButton changing in custom cell

【发布时间】：2013-11-09 12:46:55

【问题描述】：

我正在使用此代码更改我的UITableView 中的UIButton。 问题是当我滚动时，表格的按钮会无缘无故地发生变化。

UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
[button setFrame:CGRectMake(232, 88, 78, 24)];

if([[array objectAtIndex:(indexPath.row)] isEqualToString:@"0"])
    [button setImage:[UIImage imageNamed:@"pic1"] forState:UIControlStateNormal];
else
    [button setImage:[UIImage imageNamed:@"pic2"] forState:UIControlStateNormal];

[button addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];
[Cell.contentView addSubview:button];

这是buttonClicked: 方法：

-(void)buttonClicked:(id)sender

    CGPoint touchPoint = [sender convertPoint:CGPointZero toView:self.myTableView];
    NSIndexPath *indexPath = [self.myTableView indexPathForRowAtPoint:touchPoint];
    UIButton *button = (UIButton *)sender;
    if([[array objectAtIndex:indexPath.row] isEqualToString:@"0"])
    
        [button setImage:[UIImage imageNamed:@"pic2"] forState:UIControlStateNormal];
        [array replaceObjectAtIndex:indexPath.row withObject:@"1"];
    
    else
    
        [button setImage:[UIImage imageNamed:@"pic1"] forState:UIControlStateNormal];
        [array replaceObjectAtIndex:indexPath.row withObject:@"0"];
    

【问题讨论】：

这是因为表格视图重用了它的单元格，您应该在委托方法tableview:cellforrowatindexpath: 中更新您的按钮状态或任何其他按钮的属性。

【参考方案1】：

那是因为您的单元格正在被重复使用。试试这个：

    UIButton *button; = (UIButton *) [cell viewWithTag:34]; 
if (!button) 
button = [UIButton buttonWithType:UIButtonTypeCustom];
[button setFrame:CGRectMake(232, 88, 78, 24)];
button.tag = 34; 

if([[array objectAtIndex:(indexPath.row)] isEqualToString:@"0"])
    [button setImage:[UIImage imageNamed:@"pic1"] forState:UIControlStateNormal];
else
    [button setImage:[UIImage imageNamed:@"pic2"] forState:UIControlStateNormal];

[button addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];
[Cell.contentView addSubview:button];

【讨论】：

还是不行，我按了button1，向下滚动，button5和button6变成了pic2。向上滚动，button1 变回了 pic1。

对不起，还是同样的问题。