Question

我知道这个问题与其他问题非常相似，但我并没有使用这种方法解决问题。我遵循大部分可用的解决方案，但它对我不起作用.. 我知道当tableview滚动它重用单元格但我不知道维持按钮状态的方法。我将尝试使用以下链接

我做了所有的事情。使用标签，使用触摸点，但似乎没有什么似乎对我有用。所以帮助我...这里是我的示例代码

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
  cell = (subcategoryCell *)[tableView dequeueReusableCellWithIdentifier:NSStringFromClass([subcategoryCell class]) forIndexPath:indexPath];


/*
 *  Set button for cell to subscribe with it
 */
cell.btnsubscribe = (UIButton *)[cell.contentView viewWithTag:303];
cell.btnsubscribe.tag = indexPath.row ;


[cell.btnsubscribe addTarget:self action:@selector(clickBtnSubscribe:) forControlEvents:UIControlEventTouchUpInside];

if (![_arraybtnState containsObject:listid] )
    {
        [cell.btnsubscribe setImage:[UIImage imageNamed:@"follow"] forState:UIControlStateNormal];
        [cell.btnsubscribe setSelected:YES];
    }
    else {
        [cell.btnsubscribe setImage:[UIImage imageNamed:@"following"] forState:UIControlStateNormal];
        [cell.btnsubscribe setSelected:NO];
    }

  return cell;
  }

_arrbtnstate包含用户遵循的ID 和listid包含来自数据库的唯一ID

点击事件方法......

- (IBAction)clickBtnSubscribe:(id)sender {

UIButton *button = (UIButton*)sender;
NSLog(@"selected button tag %li", (long)button.tag);
NSNumber *tagnum = [NSNumber numberWithLong:(long)button.tag];

if (button.selected) {
    [self.arraybtnState addObject:tagnum];
    [button setImage:[UIImage imageNamed:@"following"] forState:UIControlStateNormal];
    NSLog(@"Subscribe");
    [self subscribeButton:button.tag];
    [button setSelected:NO];
}
else
{
    [self.arraybtnState removeObject:tagnum];
    [button setImage:[UIImage imageNamed:@"follow"] forState:UIControlStateNormal];
    NSLog(@"unsubscribe");
    [self unsubscribeButton:button.tag];
    [button setSelected:YES];
}

}

注意：在此代码中，按钮是在storyboard中创建的，但我也尝试过没有故事板。

Answer 1

首先要更改此行cell.btnsubscribe = (UIButton *)[cell.contentView viewWithTag:303];。请按照以下步骤尝试

在自定义subcategoryCell中将IBOutlet连接到btnsubscribe。
在情节提要中，您可以将选定图像和非普通图像都设置为UIButton，此处为btnsubscribe。如果您发现难以遵循this

在cellForRowAtIndexPath:删除以下行

[cell.btnsubscribe setImage:[UIImage imageNamed:@"follow"] forState:UIControlStateNormal];
[cell.btnsubscribe setImage:[UIImage imageNamed:@"following"] forState:UIControlStateNormal];
cell.btnsubscribe = (UIButton *)[cell.contentView viewWithTag:303];

更新以下行

if (![_arraybtnState containsObject:listid] )
{
     [cell.btnsubscribe setSelected:YES];
}
else {
     [cell.btnsubscribe setSelected:NO];
}

或只是[cell.btnsubscribe setSelected:(![_arraybtnState containsObject:listid] )];

将addTarget保留在单元格中用于行方法（因为您有自定义单元格类，最好将按钮操作移动到单元格类并通过回调或委托将结果传递给viewcontroller。现在，但推荐）并通过删除
更新clickBtnSubscribe:
```
[button setImage:[UIImage imageNamed:@"following"] forState:UIControlStateNormal];
[button setImage:[UIImage imageNamed:@"follow"] forState:UIControlStateNormal];
```

这些台词。假设其他部分正常工作。

Answer 2

在两种情况下，您都要为按钮的正常状态设置已选择和未选择的图像，即UIControlStateNormal。使用选定的方法时，不需要再次使用setImage。只需在cellForRowAtIndexpath或xib中正确设置Image for Normal和selected状态。你完成了。

首先删除clickBtnSubscribe :(）方法中的设置图像。

现在，在故事板中为正常和选定状态设置图像。同样删除索引路径中行的单元格中的图像，就像您在视图中一样。

Answer 3

您可以将按钮的状态维持为 -

//只初始化一次数组

_arraybtnState = [[NSMutableArray alloc] init];

//索引路径中行的单元格将为

//最初每个单元格都有跟随图像

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
  cell = (subcategoryCell *)[tableView dequeueReusableCellWithIdentifier:NSStringFromClass([subcategoryCell class]) forIndexPath:indexPath];

[cell.btnsubscribe setTag: indexPath.row];
[cell.btnsubscribe addTarget:self action:@selector(clickBtnSubscribe:) forControlEvents:UIControlEventTouchUpInside];

    if (![_arraybtnState containsObject:[NSNumber numberWithInt:indexPath.row]] )
    {
        [cell.btnsubscribe setImage:[UIImage imageNamed:@"follow"] forState:UIControlStateNormal];
        [cell.btnsubscribe setSelected:YES];
    }
    else 
    {
        [cell.btnsubscribe setImage:[UIImage imageNamed:@"following"] forState:UIControlStateNormal];
        [cell.btnsubscribe setSelected:NO];
    }

  return cell;
  }

- (IBAction)clickBtnSubscribe:(id)sender {

UIButton *button = (UIButton*)sender;
NSLog(@"selected button tag %li", (long)button.tag);
NSNumber *tagnum = [NSNumber numberWithLong:(long)button.tag];

if (button.selected) {
    [self.arraybtnState addObject:tagnum];
    NSLog(@"Subscribe");
    [self subscribeButton:button.tag];
    [button setSelected:NO];
}
else
{
    [self.arraybtnState removeObject:tagnum];
    NSLog(@"unsubscribe");
    [self unsubscribeButton:button.tag];
    [button setSelected:YES];
}

    //after doing modification update the respective row as

    UIButton *button = (UIButton *)sender;

    // Find Point in Superview
    CGPoint pointInSuperview = [button.superview convertPoint:button.center toView:self.tableView];

    // Infer Index Path
    NSIndexPath *indexPath = [self.tableView indexPathForRowAtPoint:pointInSuperview];

    //relaod the row
    NSArray* indexPathModel = [NSArray arrayWithObjects:indexPath, nil];
    [self.tableView reloadRowsAtIndexPaths: indexPathModel withRowAnimation:UITableViewRowAnimationNone];

}

重新加载行会将模态中所做的更改反映到UI中。

Answer 4

我认为您可以将此行放在viewDidLoad中，或者在加载所有订阅的内容之后。

   _arraybtnState = [NSMutableArray arrayWithArray:[self.strSubscribe componentsSeparatedByString:@","]];

然后cellForRowAtIndexPath会像下面的

一样

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
  cell = (subcategoryCell *)[tableView dequeueReusableCellWithIdentifier:NSStringFromClass([subcategoryCell class]) forIndexPath:indexPath];


/*
 *  Set button for cell to subscribe with it
 */
cell.btnsubscribe = (UIButton *)[cell.contentView viewWithTag:303];
cell.btnsubscribe.tag = indexPath.row ;

[cell.btnsubscribe addTarget:self action:@selector(clickBtnSubscribe:) forControlEvents:UIControlEventTouchUpInside];

     if (![_arraybtnState containsObject:[NSNumber numberWithInt:indexPath.row]] ) {

        [cell.btnsubscribe setImage:[UIImage imageNamed:@"follow"] forState:UIControlStateNormal];
    }
    else {
        [cell.btnsubscribe setImage:[UIImage imageNamed:@"following"] forState:UIControlStateNormal];
    }

  return cell;
  }

然后将btn点击方法改为

- (IBAction)clickBtnSubscribe:(id)sender {

UIButton *button = (UIButton*)sender;
NSLog(@"selected button tag %li", (long)button.tag);
NSNumber *tagnum = [NSNumber numberWithLong:(long)button.tag];


  if (![_arraybtnState containsObject:tagnum] )
  {
      [_arraybtnState addObject:tagnum];
      [button setImage:[UIImage imageNamed:@"following"] forState:UIControlStateNormal];
    NSLog(@"Subscribe");
    [self subscribeButton:button.tag];


    }
    else {

    [self.arraybtnState removeObject:tagnum];
    [button setImage:[UIImage imageNamed:@"follow"] forState:UIControlStateNormal];
    NSLog(@"unsubscribe");
    [self unsubscribeButton:button.tag];


    }

}

Answer 5

两种简单的解决方案，实施起来非常快：

跟踪数组/词典中的状态

您可以将状态存储在一系列状态中，我将举例说明。

（注意：我没有编译就编码了，我可能会误写一些东西，随意编辑我的帖子）

在viewDidLoad

  arrState = [[NSMutableArray alloc]init];
  for (yourObject *object in dataArray){  
      //For every object that you use to load your tableview, this can be strings or anything really
       [arrState addObject:@NO];

    }

在cellForRow

...
//This will either put YES or NO depending on the element in the state array.
[cell.button setSelected:[arrState objectAtIndex:indexPath.row]];
...

您还可以在数据库或任何持久性内容中跟踪此信息，然后您只需加载字段包含的所选记录。如果我们正在讨论诸如收藏夹之类的东西，或者在用户另有决定之前将会出现的东西，这就更具相关性。如果只是为了在视图生命周期内跟踪按钮状态，请忽略这部分答案。

如果你需要永远保持活着（即使应用程序关闭），那么你很可能需要一个数据库：）

滚动时在UITableview单元格中保持自定义按钮的状态

5 个答案: