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移动单元格行然后访问它们的属性时，我遇到了一个非常奇怪的故障。老实说，这太难解释了，所以我记录了 iOS 模拟器上发生的故障。我没有使用故事板。

这是视频： iPhone故障

以下是一些相关代码：

表视图控制器.m：

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
   UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"UITableViewCell"];
    if (!cell)
        cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:@"UITableViewCell"];
    NSString *detailText = [NSString stringWithFormat:@"%.0f", [[taskArray objectAtIndex:[indexPath row]] timeInterval]];
    [cell setAccessoryType:UITableViewCellAccessoryDisclosureIndicator];
    [cell setBackgroundColor:[UIColor colorWithRed:236.0/255 green:240.0/255 blue:241.0/255 alpha:1.0f]];
    cell.textLabel.textColor = turquoiseColor;
    [[cell detailTextLabel] setText:detailText];
    [[cell detailTextLabel] setFont:[UIFont fontWithName:@"Avenir-Black" size:12]];
    [[cell textLabel] setFont:[UIFont fontWithName:@"AvenirNext-DemiBold" size:16]];

    if([indexPath section] == 0){
    cell.textLabel.text = [[[taskArray objectAtIndex:[indexPath row]] taskName] uppercaseString];
    } else if ([indexPath section] == 1) {
    cell.textLabel.text = [[[completedArray objectAtIndex:[indexPath row]] taskName] uppercaseString];
    }
    return cell;
}
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
    Tasks *task = [[Tasks alloc]init];
    task.taskName = [[taskArray objectAtIndex:[indexPath row]] taskName];
    task.timeInterval = [[taskArray objectAtIndex:[indexPath row]] timeInterval];
    task.dateCreated = [[taskArray objectAtIndex:[indexPath row]] dateCreated];
    DetailViewController *dvc = [[DetailViewController alloc]init];
    [dvc setTestTask:task];
    [[self navigationController] pushViewController:dvc animated:YES];
}
-(void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)sourceIndexPath toIndexPath:(NSIndexPath *)destinationIndexPath{
   Tasks *t = [[Tasks alloc]init];
    if (sourceIndexPath.row > destinationIndexPath.row) {
        [taskArray insertObject:t atIndex:destinationIndexPath.row];
        [taskArray removeObjectAtIndex:(sourceIndexPath.row + 1)];
    }
    else if (sourceIndexPath.row < destinationIndexPath.row) {
        [taskArray insertObject:t atIndex:(destinationIndexPath.row + 1)];
        [taskArray removeObjectAtIndex:(sourceIndexPath.row)];
    }
}

DetailViewController.h（单元格的属性）

@class Tasks;

@interface DetailViewController : UIViewController
@property (weak, nonatomic) IBOutlet UILabel *timeLeft;
@property (weak, nonatomic) IBOutlet UILabel *timerLabel;
@property (nonatomic, strong) Tasks *testTask;
@end

细节视图控制器.m

- (void)viewDidLoad
{
    [super viewDidLoad];
    [_timeLeft setFont:[UIFont fontWithName:@"BebasNeue" size:25]];
}
-(void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];
    NSString *time = [NSString stringWithFormat:@"%.0f", [testTask timeInterval]];
    [_timerLabel setText:time];
    [_timerLabel setFont:[UIFont fontWithName:@"BebasNeue" size:60]];
    [[self navigationItem] setTitle:[testTask taskName]];
}
-(void)viewWillDisappear:(BOOL)animated{
    [super viewWillDisappear:animated];

    [testTask setTaskName:[testTask taskName]];
    [testTask setTimeInterval:[testTask timeInterval]];

}
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1 回答 1

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Tasks每当用户移动一行时，您都会插入一个空对象。相反，试试这个来移动数据源数组中的项目：

-(void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)sourceIndexPath toIndexPath:(NSIndexPath *)destinationIndexPath
{
    Tasks *taskToMove = [taskArray objectAtIndex:sourceIndexPath.row];
    [taskArray removeObjectAtIndex:sourceIndexPath.row];
    [taskArray insertObject:taskToMove atIndex:destinationIndexPath.row];
}

我认为您仅在推送视图控制器并弹出它后才看到错误的原因是，当用户移动一行时，该行不会重新加载。如果它已重新加载，那么您就会看到故障。

希望这可以帮助！

于 2013-07-01T20:26:05.707 回答