ios - 选择一个单元格显示一个按钮，取消选择隐藏该按钮

Question

我希望在我选择一个单元格时显示一个按钮，当我选择同一个单元格或另一个单元格时我希望该按钮隐藏。因此一次只能显示一个按钮。

我有什么:

在我的 .h 文件中:

@property (strong, nonatomic) NSIndexPath *isselectednow;

和我的 .m 文件:

查看加载:

self.isselectednow = [NSIndexPath indexPathForRow:7 inSection:1];

cellForRowAtIndexPath:

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


static NSString *CellIdentifier = @"Cell";

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


 //[cell addSubview:[self drawSeparationView:(indexPath.row)]];

 UILabel *DateName = (UILabel *)[cell viewWithTag:100100];
 DateName.textColor = [UIColor blackColor];
 //DateName.text = [NSString stringWithFormat:@"%ld",(long)indexPath.row ];
 DateName.text = objects[indexPath.row];

UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button addTarget:self
           action:@selector(buttonOnCellPressed:)
 forControlEvents:UIControlEventTouchDown];
[button setTitle:@"Update" forState:UIControlStateNormal];
button.frame = CGRectMake(DEVICE_SIZE.width - 60, 18, 55, 15);

[cell addSubview:button];
if ([indexPath compare:self.isselectednow] == NSOrderedSame) {
    button.hidden = NO;
}
else{
    button.hidden = YES;
}

 UILabel *lbl1 = (UILabel *)[cell viewWithTag:100101];
 lbl1.textColor = UIColorFromRGB(0x141414);
 UILabel *lbl2 = (UILabel *)[cell viewWithTag:100102];
 lbl2.textColor = UIColorFromRGB(0x141414);
 UILabel *lbl3 = (UILabel *)[cell viewWithTag:100103];
 lbl3.textColor = UIColorFromRGB(0x141414);
 UILabel *lbl4 = (UILabel *)[cell viewWithTag:100104];
 lbl4.textColor = UIColorFromRGB(0x141414);
 UILabel *lbl5 = (UILabel *)[cell viewWithTag:100105];
 lbl5.textColor = UIColorFromRGB(0x141414);

 UITextField *breakfastName = (UITextField *) [cell viewWithTag:100200];
 breakfastName.attributedPlaceholder =
 [[NSAttributedString alloc]
  initWithString:@"Name here"
  attributes:@{NSForegroundColorAttributeName:UIColorFromRGB(0x141414)}];
 breakfastName.textColor = UIColorFromRGB(0x141414);
 [breakfastName setDelegate:self];
 //[breakfastName addTarget:self action:@selector(textChanged:) forControlEvents:UIControlEventEditingChanged];

 UITextField *OutName = (UITextField *) [cell viewWithTag:100201];
 OutName.attributedPlaceholder =
 [[NSAttributedString alloc]
  initWithString:@"Name here"
  attributes:@{NSForegroundColorAttributeName:UIColorFromRGB(0x141414)}];
 OutName.textColor = UIColorFromRGB(0x141414);
 [OutName setDelegate:self];

 UITextField *lunchName = (UITextField *) [cell viewWithTag:100202];
 lunchName.attributedPlaceholder =
 [[NSAttributedString alloc]
  initWithString:@"Name here"
  attributes:@{NSForegroundColorAttributeName:UIColorFromRGB(0x141414)}];
 lunchName.textColor = UIColorFromRGB(0x141414);
 [lunchName setDelegate:self];

 UITextField *InName = (UITextField *) [cell viewWithTag:100203];
 InName.attributedPlaceholder =
 [[NSAttributedString alloc]
  initWithString:@"Name here"
  attributes:@{NSForegroundColorAttributeName:UIColorFromRGB(0x141414)}];
 InName.textColor = UIColorFromRGB(0x141414);
 [InName setDelegate:self];

 UITextField *eveningName = (UITextField *) [cell viewWithTag:100204];
 eveningName.attributedPlaceholder =
 [[NSAttributedString alloc]
  initWithString:@"Name here"
  attributes:@{NSForegroundColorAttributeName:UIColorFromRGB(0x141414)}];
 eveningName.textColor = UIColorFromRGB(0x141414);
 [eveningName setDelegate:self];

 UITextField *othersName = (UITextField *) [cell viewWithTag:100205];
 othersName.attributedPlaceholder =
 [[NSAttributedString alloc]
 initWithString:@"Name here"
 attributes:@{NSForegroundColorAttributeName:UIColorFromRGB(0x141414)}];
 othersName.textColor = UIColorFromRGB(0x141414);



 cell.clipsToBounds = YES;
 cell.accessoryType = UITableViewCellAccessoryNone;
 cell.backgroundColor = UIColorFromRGB(0xf3f0e9);

返回单元格；

didSelectRowAtIndexPath:

[tableView beginUpdates];
if ([indexPath compare:self.isselectednow] == NSOrderedSame) {
    self.isselectednow = nil;
}
else{
    self.isselectednow = indexPath;
}

[tableView endUpdates];
//[tableView reloadData];

Answer 1

来自docs about beginUpdates :

Call this method if you want subsequent insertions, deletion, and selection operations (for example, cellForRowAtIndexPath: and indexPathsForVisibleRows) to be animated simultaneously.

尽管您已经更改了 isSelectedNow bool 值，您实际上没有在 beginUpdates 之间指定任何插入、删除或选择操作和 endUpdates .因此，您实际上并没有使用该代码开始或结束对单元格内容的任何更新。

我不确定你想做什么，但取出 [tableView beginUpdates];和 [tableView beginUpdates];并重新插入 [tableView reloadData];将导致正确的数据重新加载。

编辑:

除此之外，问题是您正在使用 dequeueReusableCellWithIdentifier: 重复使用您的单元格，但您要添加一个新的 UIButton subview 每次，所以你基本上把每个新的 UIButton在旧的。我建议按照您在 cellForRowAtIndexPath: 中对所有标签和文本字段所做的操作进行操作-- 通过将更新按钮添加到您的自定义表格 View 单元格并使用 viewWithTag: 访问它来重复使用您的更新按钮.