Question

在我的表视图中，我有4 UIButton个，每个表视图中有2个。最初所有按钮上都有一个图像（它们是硬编码的）。现在我的应用程序中有一个按钮，当点击时，使用setImage方法用新的按钮替换按钮上的图像，然后重新加载表格视图。但不幸的是，我得到的旧表视图只是我的意思与旧图像。如何在按钮上获取新图像？

我的cellForRowAtIndexPath实现： - //自定义表格视图单元格的外观。

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    // if (cell == nil) {
    // cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease];
    // }
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
    }

    if(indexPath.row == 0)
    {
        button1=[[UIButton alloc] initWithFrame:CGRectMake(15,5,100,87)];
        [button1 setImage:[UIImage imageNamed:@"BUTTON.png"] forState:UIControlStateNormal];
        [button1 addTarget:self action:@selector(ClickTo:) forControlEvents:UIControlEventTouchUpInside];
        [cell.contentView addSubview:self.button1];

        button2=[[UIButton alloc] initWithFrame:CGRectMake(135,5,100,87)];
        [button2 setImage:[UIImage imageNamed:@"TURN OFF.png"] forState:UIControlStateNormal];
        [button2 addTarget:self action:@selector(ClickTo:) forControlEvents:UIControlEventTouchUpInside];
        [cell.contentView addSubview:button2];
    }
    else if(indexPath.row == 1)
    {
        button3=[[UIButton alloc] initWithFrame:CGRectMake(15,5,100,87)];
        [button3 setImage:[UIImage imageNamed:@"JUMP.png"] forState:UIControlStateNormal];
        [button3 addTarget:self action:@selector(ClickTo:) forControlEvents:UIControlEventTouchUpInside];
        [cell.contentView addSubview:button3];


        button4=[[UIButton alloc] initWithFrame:CGRectMake(135,5,100,87)];
        [button4 setImage:[UIImage imageNamed:@"CLOSE.png"] forState:UIControlStateNormal];
        [button4 addTarget:self action:@selector(ClickTo:) forControlEvents:UIControlEventTouchUpInside];
        [cell.contentView addSubview:button4];
    }
    else
    {
        // Do something here
    }
    return cell;
}

Answer 1

您可能将图像设置为错误的状态：

[myButton setImage:[UIImage imageNamed:@"myImage.png"] forState:UIControlStateNormal];

您需要为UIControlStateNormal设置正确的值 - 其中正确表示与按钮当前状态匹配的值。

Answer 2

看起来你在单元格中有行方法的硬编码图像，所以每当你重新加载你的tableview时，它们都会有相同的图像。

所以如果你想改变它们，那么拿一个布尔变量并像下面那样更新它：

（UITableViewCell *）tableView：（UITableView *）tableView cellForRowAtIndexPath：（NSIndexPath *）indexPath {

static NSString * CellIdentifier = @“Cell”;

UITableViewCell * cell = [tableView dequeueReusableCellWithIdentifier：CellIdentifier]; // if（cell == nil）{ // cell = [[[UITableViewCell alloc] initWithFrame：CGRectZero reuseIdentifier：CellIdentifier] autorelease]; //} if（cell == nil）{ cell = [[[UITableViewCell alloc] initWithStyle：UITableViewCellStyleDefault reuseIdentifier：CellIdentifier] autorelease]; }

if（indexPath.row == 0） { button1 = [[UIButton alloc] initWithFrame：CGRectMake（15,5,100,87）];
```
[button1 setImage:[UIImage imageNamed:@"BUTTON.png"] forState:UIControlStateNormal];
[button1 addTarget:self action:@selector(ClickTo:) forControlEvents:UIControlEventTouchUpInside];
[cell.contentView addSubview:self.button1];

button2=[[UIButton alloc] initWithFrame:CGRectMake(135,5,100,87)];
[button2 setImage:[UIImage imageNamed:@"TURN OFF.png"] forState:UIControlStateNormal];
[button2 addTarget:self action:@selector(ClickTo:) forControlEvents:UIControlEventTouchUpInside];
[cell.contentView addSubview:button2];
```
} else if（indexPath.row == 1） { button3 = [[UIButton alloc] initWithFrame：CGRectMake（15,5,100,87）]; [button3 setImage：[UIImage imageNamed：@“JUMP.png”] forState：UIControlStateNormal]; [button3 addTarget：self action：@selector（ClickTo :) forControlEvents：UIControlEventTouchUpInside]; [cell.contentView addSubview：button3];
```
button4=[[UIButton alloc] initWithFrame:CGRectMake(135,5,100,87)];
[button4 setImage:[UIImage imageNamed:@"CLOSE.png"] forState:UIControlStateNormal];
[button4 addTarget:self action:@selector(ClickTo:) forControlEvents:UIControlEventTouchUpInside];
[cell.contentView addSubview:button4];
```
} 其他 { //在这做点什么 }

如果（myflag） {

[button1 setImage：[UIImage imageNamed：@“changedImage1”] forState：UIControlStateNormal]; [button2 setImage：[UIImage imageNamed：@“changedImage2”] forState：UIControlStateNormal]; [button3 setImage：[UIImage imageNamed：@“changedImage3”] forState：UIControlStateNormal]; [button4 setImage：[UIImage imageNamed：@“changedImage4”] forState：UIControlStateNormal];

}

return cell;

}

//在Click to Method中设置myflag yes并重新加载表

- （void）ClickTo：（IBAction）发件人 {

myflag = YES; [tableview reloadData];

}

重新加载表视图中的按钮中的图像

2 个答案: