Question

我尝试自定义选择UITableView个单元格。要做到这一点，我在我的单元格上方创建了UIView，它现在显示/消失。但问题是当我按下细胞选择出现时。如果那时我选择任何其他行也将被选中！但一定不能。必须取消选择每个前一个单元格，但我只对UITableView进行单一选择。我很乐意提供任何帮助。

这是我的代码：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath: (NSIndexPath *)indexPath
 {
 static NSString *CellIdentifier = @"userDataCell";
 AVMThemeCell *cell = [self.userContentTable dequeueReusableCellWithIdentifier:CellIdentifier]; 

 // Configure the cell...
if (cell == nil) {
 cell = [[AVMThemeCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
  AVMDataStore *oneItem = [userContentArray objectAtIndex:indexPath.row];
  oneItem = [userContentArray objectAtIndex:indexPath.row];

 [cell setGenre:oneItem];
 cell.imgView.image = [UIImage imageNamed:imgThemesArray[indexPath.row]];



 //save cell state!

 NSNumber *rowNsNum = [NSNumber numberWithUnsignedInt:(unsigned int)indexPath.row];
 if ([selectedCellsArray containsObject:[NSString stringWithFormat:@"%@",rowNsNum]]  )
 {
     NSLog(@"selectedCellsArray %@",selectedCellsArray);
     cell.selectedBG.hidden=NO;
     [cell setSelected:NO animated:YES];
 }
 else
 {

     cell.selectedBG.hidden=YES;

 }


 return cell;
}



- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
@try{
    // TODO: Select Item
    if (shareEnabled) {

        [selectedCellsArray removeAllObjects];
        AVMThemeCell *collectionCell = (AVMThemeCell*)[tableView cellForRowAtIndexPath:indexPath];
        NSNumber *rowNsNum = [NSNumber numberWithUnsignedInt:(unsigned int)indexPath.row];

        if ( ![selectedCellsArray containsObject:[NSString stringWithFormat:@"%@",rowNsNum]]  )
        {
            [selectedCellsArray addObject:[NSString stringWithFormat:@"%ld",(long)indexPath.row]];

            collectionCell.selectedBG.hidden = NO;
            [collectionCell setSelected:NO animated:YES];
          //  NSLog(@"view is %@",collectionCell.selectedBG);
            NSLog(@"selected view is hidden = %hhd",collectionCell.hidden);
            NSLog(@"selected in didselect %d",(int)indexPath.row);
        }
        else {
            [selectedCellsArray removeObject:[NSString stringWithFormat:@"%ld",(long)indexPath.row]];
            collectionCell.selectedBG.hidden = YES;
           NSLog(@"DEselected in didDEselect");
        }

    }
} @catch (NSException *e){
    NSLog(@"Exception! %@",e);
}



}

Answer 1

更简单的方法是使用NSIndexPath。

创建NSIndexPath变量以跟踪上次选择的单元格。

@property (nonatomic, strong) NSIndexPath *selectedIndexPath;

viewDidLoad()方法中的初始化变量：

self.selectedIndexPath = [NSIndexPath indexPathForRow:-1 inSection:-1];

观察行的值-1和上面一行中-1的部分，它将初始化indexPath而不在tableView中选择行。

现在，UITableView数据源方法如下所示：

在cellForRowAtIndexPath方法中，是否选择了检查当前indexPath的条件？

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

    // Change background color of selected cell

    if (self.selectedIndexPath == indexPath) {
        [cell setBackgroundColor:[UIColor orangeColor]];
    } else {
        [cell setBackgroundColor:[UIColor clearColor]];
    }

    // . . .
}

在didSelectRowAtIndexPath方法中更新选定的索引路径：

- (void) tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    // . . .

    AVMThemeCell *previousCell = (AVMThemeCell *)[tableView cellForRowAtIndexPath:self.selectedIndexPath];
    previousCell.backgroundColor = [UIColor clearColor];

    self.selectedIndexPath = indexPath;
    AVMThemeCell *selectedCell = AVMThemeCell *[tableView cellForRowAtIndexPath:self.selectedIndexPath];
    selectedCell.backgroundColor = [UIColor orangeColor];

    // . . .
}

单选UITableView覆盖单元格

1 个答案: