ActivityView未显示

Question

我正在尝试向我的应用程序添加下载进度视图，并且它在调试预览中显示时并未实际显示在设备上。任何人都可以向我解释这个吗？

这里是调试的截图和一些代码：

- (void)updateDownloadProgressWithBatchIndex:(int)index contentName:(NSString *)name 
{ 
    CGSize size = self.view.bounds.size; 

    _loadingView = [[UIView alloc] initWithFrame:CGRectMake(75, 155, 170, 170)]; 
    _loadingView.backgroundColor = [UIColor blackColor]; 
    _loadingView.clipsToBounds = YES; 
    _loadingView.layer.cornerRadius = 10.0; 
    [_loadingView setCenter:CGPointMake(size.width/2, size.height/2)]; 

    _activityView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite]; 
    _activityView.frame = CGRectMake(65, 40, _activityView.bounds.size.width,  _activityView.bounds.size.height); 
    _activityView.hidden = NO; 
    [_activityView setCenter:CGPointMake(size.width/2, size.height/2)]; 
    [_loadingView addSubview:_activityView]; 

    _loadingLabel = [[UILabel alloc] initWithFrame:CGRectMake(20, 115, 130, 22)]; 
    _loadingLabel.backgroundColor = [UIColor clearColor]; 
    _loadingLabel.textColor = [UIColor whiteColor]; 
    _loadingLabel.adjustsFontSizeToFitWidth = YES; 
    _loadingLabel.textAlignment = UITextAlignmentCenter; 
    _loadingLabel.text = [NSString stringWithFormat:@"Batch %i downloading...", index]; 
    [_loadingView addSubview:_loadingLabel]; 

    [self.view addSubview:_loadingView]; 
    _loadingView.hidden = NO; 
    UIView *v = self.view; 
    [_activityView startAnimating]; 
} 

Answer 1

我要带胡乱猜测 - 它必须是野生的，因为你拒绝出示你的代码 - 在拨打updateDownloadProgress后，您正在进行同步联网。这是问题的原因。因此，活动视图无法开始旋转将是诊断问题，因此问题是同步网络，这是一个禁忌。