Question

所以我知道这个错误的原因，但我不确定如何绕过它。

我有TextField我想要不可编辑，但在视图中启用了滚动功能。

这是我设置该视图的方式：

    - (void)tableView:(UITableView *) tableView
didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
    NSDictionary *component = self.resultsTuples[indexPath.row];
    NSString* serverUrl = @"http://staging.toovia.com";
    NSString* pageLink = component[@"$element"][@"ContactCard"][@"PageLink"];
    NSString* recUrl =[NSString stringWithFormat:@"%@%@&format=json&fields=summary&fields=session_info", serverUrl,pageLink];

    [AJAXUtils getAsyncJsonWithUrl:(NSURL *)[NSURL URLWithString:recUrl]  callback:^(NSDictionary *returnjson){
        if (returnjson != nil){
            NSLog(@"RETURN JSON : %@", returnjson);
            NSString *userPageLink = returnjson[@"Node"][@"SessionInfo"][@"PostingAs"][@"Key"];
            self.detailController.userPageLink = userPageLink;
            self.detailController.nodePage = returnjson[@"Node"][@"Key"];
            NSString *selectedCard = component[@"$element"][@"Title"];
         //   [self.detailController setDescription:component[@"element"][@"ContactCard"][@"Description"]];
            [self.detailController setPageTitle:selectedCard];
            NSString* photoUrl = component[@"$element"][@"ContactCard"][@"Cover"][@"Medium"][@"Link"];
            [self.detailController setRestaurantImage:[UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:photoUrl]]]];



            self.detailController.title = selectedCard;

            NSString* rating = component[@"$element"][@"Summary"][@"AverageRating"];
            self.detailController.rating =(NSInteger)rating;
            [self.navigationController pushViewController:self.detailController animated:YES];
        }
    }];

这是视图的viewWillAppear代码：

-(void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear: animated];
    self.rateView.notSelectedStar =[UIImage imageNamed:@"star-off.png"];
    self.rateView.fullSelectedStar = [UIImage imageNamed:@"star-on.png"];
    self.rateView.rating = self.rating;
    self.rateView.editable = YES;
    self.rateView.maxRating = 5;
    self.rateView.delegate = self;
    _pageTitleLabel.text = _pageTitle;
    _pageScoreLabel.text = _pageScore;
    _trendingImageView.image = [UIImage imageNamed:@"trending.png"];
    _restaurantImageView.image = _restaurantImage;

}

完整错误是 -

    2013-12-16 01:22:50.362 ReviewApp[7332:441f] *** Assertion failure in void _UIPerformResizeOfTextViewForTextContainer(NSLayoutManager *, UIView<NSTextContainerView> *, NSTextContainer *, NSUInteger)(), /SourceCache/UIFoundation_Sim/UIFoundation-258.1/UIFoundation/TextSystem/NSLayoutManager_Private.m:1510
2013-12-16 01:22:50.365 ReviewApp[7332:441f] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Only run on the main thread!'

所以我猜它正在发生，因为文本字段的大小调整（当设置内容时）必须在主线程上发生。如何强制这种情况发生/抑制此错误？我不能控制文本字段调整大小吗？

由于

Answer 1

我猜测来自AJAXUtils的回调发生在后台线程上。我不知道这是不是你的代码，但是你应该在主线程上做所有的UI操作（比如在标签中设置文本，在图像视图中设置图像，推动视图控制器）。

dispatch_sync(dispatch_get_main_queue(), ^{
    /* Do UI work here */
});

Answer 2

Swift 3.0版

DispatchQueue.main.async(execute: {
    /* Do UI work here */
})

Answer 3

您必须始终在主线程上执行UI代码。你不是，因此错误。试试这个：

[AJAXUtils getAsyncJsonWithUrl:(NSURL *)[NSURL URLWithString:recUrl]  callback:^(NSDictionary *returnjson){
    if (returnjson != nil){
        NSLog(@"RETURN JSON : %@", returnjson);
        NSString *userPageLink = returnjson[@"Node"][@"SessionInfo"][@"PostingAs"][@"Key"];
        self.detailController.userPageLink = userPageLink;
        self.detailController.nodePage = returnjson[@"Node"][@"Key"];
        NSString *selectedCard = component[@"$element"][@"Title"];
     //   [self.detailController setDescription:component[@"element"][@"ContactCard"][@"Description"]];
        [self.detailController setPageTitle:selectedCard];
        NSString* photoUrl = component[@"$element"][@"ContactCard"][@"Cover"][@"Medium"][@"Link"];
        [self.detailController setRestaurantImage:[UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:photoUrl]]]];

        self.detailController.title = selectedCard;

        NSString* rating = component[@"$element"][@"Summary"][@"AverageRating"];
        self.detailController.rating =(NSInteger)rating;
        dispatch_async(dispatch_get_main_queue(), ^{
            [self.navigationController pushViewController:self.detailController animated:YES];
        });
    }
}];

这可确保视图控制器的显示位于主线程上。实际上，您可能需要在dispatch_async的调用中添加更多代码。

Answer 4

Swift版

dispatch_async(dispatch_get_main_queue()){
      /* Do UI work here */
}

Answer 5

此外，在didSelectRow中执行操作并不是一种非常好的方法。你应该有一个网络层，将网络代码与视图控制器分开，否则你将得到巨大的视图控制器，代码将无法测试。

'NSInternalInconsistencyException'，原因：'只在主线程上运行！'错误

5 个答案: