ios - 设置 UITableViewCell 控件数据时应用程序崩溃

Question

我有一个应用程序，我按如下方式在 viewDidLoad 中加载数据

 dispatch_queue_t concurrentQueue = dispatch_queue_create("MyQueue", NULL);
dispatch_async(concurrentQueue, ^{
    [self loadProfile];
    dispatch_async(dispatch_get_main_queue(), ^{
        [tblViewProfile reloadData];

    });
});

自定义UITableViewCell中标签控件创建cell并设置数据后应用崩溃，代码如下

-(UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
if(indexPath.row == 0)
{
    static NSString *simpleTableIdentifier = @"ProfileViewCell";

    ProfileViewCell *cell = (ProfileViewCell *)[tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];
    if (cell == nil)
    {
        NSArray * customcellArray = [[NSBundle mainBundle]loadNibNamed:@"ProfileViewCell" owner:self options:nil];
        for(id customcellObject in customcellArray){
            if([customcellObject isKindOfClass: [UITableViewCell class]]){
                cell = (ProfileViewCell *)customcellObject;
                break;
            }
        }

    }
    cell.lblFollowers.text = strFollowers;
    cell.lblFollowing.text = strFollowing;
    cell.lblName.text = strName;
    cell.lblOOTD.text = strOOTD;

    return cell;
}
else
{
    static NSString *simpleTableIdentifier = @"PostViewCell";


    PostViewCell *cell = (PostViewCell *)[tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];
    if (cell == nil)
    {
        NSArray * customcellArray = [[NSBundle mainBundle]loadNibNamed:@"PostViewCell" owner:self options:nil];
        for(id customcellObject in customcellArray){
            if([customcellObject isKindOfClass: [UITableViewCell class]]){
                cell = (PostViewCell *)customcellObject;
                break;
            }
        }

    }



    return cell;


}

}

当我在这里给小组成员设置数据时

 cell.lblFollowers.text = strFollowers;
    cell.lblFollowing.text = strFollowing;
    cell.lblName.text = strName;
    cell.lblOOTD.text = strOOTD;

上面的第一行导致应用程序崩溃并出现访问错误。如果我删除那一行，下一行会导致同样的崩溃，我不知道这次崩溃的原因。

请帮忙

编辑做了一些测试，然后发现 Bad Exec 是由strFollowing、strFollowers 等，但我已经初始化了它们，但不确定它们在哪里以及为什么它们会被释放。

Answer 1

您可以创建一个 Utility 方法来从 NibName 获取 Class 实例

+ (id)loadNibNamed:(NSString *)nibName ofClass:(Class)objClass 
{
    if (nibName && objClass) 
    {
        NSArray *objects = [[NSBundle mainBundle] loadNibNamed:nibName 
                                                     owner:nil 
                                                   options:nil];            
        for (id currentObject in objects )
        {
            if ([currentObject isKindOfClass:objClass])
                return currentObject;
        }
    }
    return nil;
}

像这样在你的代码中使用它

ProfileViewCell *cell = (ProfileViewCell *)[tableView dequeueReusableCellWithIdentifier:@"ProfileViewCell"];
if (cell == nil)
{
    cell = [Utility loadNibNamed:@"ProfileViewCell" ofClass:[ProfileViewCell class]];

}

PostViewCell *cell = (PostViewCell *)[tableView dequeueReusableCellWithIdentifier:@"PostViewCell"];
if (cell == nil)
{
    cell = [Utility loadNibNamed:@"PostViewCell" ofClass:[PostViewCell class]];

}

希望这对你有帮助。