UIActivityIndicatorView不出现

我想显示一个UIActivityIndicatorView，而我的表视图正在加载数据，并加载完成后消失。加载指示符从不出现。我究竟做错了什么？UIActivityIndicatorView不出现
#define kBgQueue dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0) 
#define storeURL [NSURL URLWithString: @"https://www.googleapis.com/youtube/v3/playlistItems?part=snippet&maxResults=25&playlistId=PL9DC706DCCCE00188&key=AIzaSyBS4do208_KPGHAhszfVkHadSvtfSgr7Mo"] 

#import "BBYoutubeVideosTableViewController.h" 
#import "Reachability.h" 
#import "TSMessage.h" 
#import "TSMessageView.h" 
#import "YoutubeCell.h" 
#import "KFBYoutubeVideoView.h" 
#import "KFBAppDelegate.h" 

    @interface BBYoutubeVideosTableViewController() 
    { 
     UIActivityIndicatorView *loadingIndicator; 
    } 

    @end 

    @implementation BBYoutubeVideosTableViewController 
    @synthesize title, videoID, thumbURL, descriptionString, url, titleArray, videoIDArray, thumbArray, descriptionArray; 

    - (id)initWithStyle:(UITableViewStyle)style 
    { 
     self = [super initWithStyle:style]; 
     if (self) { 

     } 
     return self; 
    } 

    - (void)viewDidLoad 
    { 
     [super viewDidLoad]; 

     self.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"" style:UIBarButtonItemStylePlain target:nil action:nil]; 

     UIImageView *backgroundImage = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"plain_app-background.png"]]; 

     CGFloat width = [[UIScreen mainScreen]bounds].size.width; 
     CGFloat height = [[UIScreen mainScreen]bounds].size.height; 

     if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) 
     { 
      loadingIndicator = [[UIActivityIndicatorView alloc]initWithFrame:CGRectMake(width/2, height/2, 37, 37)]; 
      loadingIndicator.center = CGPointMake(width/2, height/2 - 37); 
     } 
     else 
     { 
      loadingIndicator = [[UIActivityIndicatorView alloc]initWithFrame:CGRectMake(142, 365, 37, 37)]; 
     } 

     loadingIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyleGray; 
     loadingIndicator.hidesWhenStopped = YES; 

     Reachability *networkReachability = [Reachability reachabilityForInternetConnection]; 
     NetworkStatus networkStatus = [networkReachability currentReachabilityStatus]; 

     if(networkStatus == NotReachable) 
     { 
      [TSMessage showNotificationWithTitle:@"Network Error" subtitle:@"No active network connection!" type:TSMessageNotificationTypeError]; 

      [loadingIndicator stopAnimating]; 
     } 
     else { 
      [self.tableView addSubview:loadingIndicator]; 
      [loadingIndicator startAnimating]; 
     } 

     self.title = @"Bluegrass & Backroads"; 

     self.tableView = [[UITableView alloc]initWithFrame:CGRectZero style:UITableViewStyleGrouped]; 
     self.tableView.backgroundView = backgroundImage; 

     url = [NSURL URLWithString:@"https://www.googleapis.com/youtube/v3/playlistItems?part=snippet&maxResults=25&playlistId=PL9DC706DCCCE00188&key=AIzaSyBS4do208_KPGHAhszfVkHadSvtfSgr7Mo"]; 

     dispatch_async(kBgQueue, ^{ 
      NSData *data = [NSData dataWithContentsOfURL:url]; 
      if (data == nil) 
      { 
       NSLog(@"data is nil"); 
      } 
      else 
      { 
       [self performSelectorOnMainThread:@selector(fetchedData:) withObject:data waitUntilDone:YES]; 
      } 
     }); 
    } 

    - (void)viewDidDisappear:(BOOL)animated 
    { 
     [loadingIndicator stopAnimating]; 
    } 

    - (void)fetchedData:(NSData *)responseData 
    { 
     NSError *error; 
     titleArray = [[NSMutableArray alloc]init]; 
     videoIDArray = [[NSMutableArray alloc]init]; 
     thumbArray = [[NSMutableArray alloc]init]; 
     descriptionArray = [[NSMutableArray alloc]init]; 

     NSDictionary *json = [NSJSONSerialization JSONObjectWithData:responseData options:kNilOptions error:&error]; 
     NSArray *items = [json objectForKey:@"items"]; 

     for (NSDictionary *item in items) 
     { 
      NSDictionary *snippet = [item objectForKey:@"snippet"]; 
      title = [snippet objectForKey:@"title"]; 
      videoID = [[snippet objectForKey:@"resourceId"] objectForKey:@"videoId"]; 
      thumbURL = [[[snippet objectForKey:@"thumbnails"] objectForKey:@"default"] objectForKey:@"url"]; 
      descriptionString = [snippet objectForKey:@"description"]; 

      [titleArray addObject:title]; 
      [videoIDArray addObject:videoID]; 
      UIImage *thumbnailImage = [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:thumbURL]]]; 
      [thumbArray addObject:thumbnailImage]; 
      [descriptionArray addObject:descriptionString]; 
     } 

     [self.tableView reloadData]; 

     [loadingIndicator stopAnimating]; 
    } 

    - (IBAction)morePressed:(id)sender 
    { 
     NSURL *kyfbVideos = [NSURL URLWithString:@"https://www.youtube.com/playlist?list=PL9DC706DCCCE00188"]; 
     [[UIApplication sharedApplication] openURL:kyfbVideos]; 
    } 

    - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView 
    { 
     return 1; 
    } 

    - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section 
    { 
     return [titleArray count]; 
    } 

    - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath 
    { 
     return 215; 
    } 

    - (CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section 
    { 
     return 60; 
    } 

    - (UIView *)tableView:(UITableView *)tableView viewForFooterInSection:(NSInteger)section 
    { 
     UIColor *kfbBlue = [UIColor colorWithRed:8.0/255.0f green:77.0/255.0f blue:139.0/255.0f alpha:1]; 

     UIView *footerView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, tableView.frame.size.width, tableView.frame.size.height)]; 
     footerView.backgroundColor = [UIColor clearColor]; 

     CGFloat width = footerView.frame.size.width; 

     UIButton *moreButton = [UIButton buttonWithType:UIButtonTypeRoundedRect]; 
     moreButton.backgroundColor = [UIColor clearColor]; 
     [moreButton setTitle:@"More" forState:UIControlStateNormal]; 
     [moreButton setTitleColor:kfbBlue forState:UIControlStateNormal]; 
     moreButton.titleLabel.textAlignment = NSTextAlignmentCenter; 
     moreButton.titleLabel.font = [UIFont fontWithName:@"FranklinGothicStd-ExtraCond" size:25.0]; 
     moreButton.frame = CGRectMake(width/2 - 25, 0, 50, 50); 
     moreButton.layer.cornerRadius = 25.0; 
     moreButton.layer.borderWidth = 2.0f; 
     moreButton.layer.borderColor = kfbBlue.CGColor; 
     moreButton.clipsToBounds = YES; 
     moreButton.backgroundColor = [UIColor clearColor]; 
     [moreButton addTarget:self action:@selector(morePressed:) forControlEvents:UIControlEventTouchUpInside]; 
     [footerView addSubview:moreButton]; 
     return footerView; 
    } 

    - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 
    { 
     UIColor *kfbBlue = [UIColor colorWithRed:8.0/255.0f green:77.0/255.0f blue:139.0/255.0f alpha:1]; 

     YoutubeCell *cell = [tableView dequeueReusableCellWithIdentifier:@"youtubeCell"]; 
     if (!cell) 
     { 
      NSArray *nibs =[[NSBundle mainBundle] loadNibNamed:@"YoutubeCell" owner:self options:NULL]; 
      cell = [nibs firstObject]; 
     } 
     cell.videoTitle.text = [titleArray objectAtIndex:indexPath.row]; 
     cell.videoDescription.text = [descriptionArray objectAtIndex:indexPath.row]; 
     cell.videoThumbnail.image = [thumbArray objectAtIndex:indexPath.row]; 

     cell.videoTitle.textColor = kfbBlue; 
     cell.videoDescription.textColor = kfbBlue; 
     cell.videoTitle.font = [UIFont fontWithName:@"FranklinGothicStd-ExtraCond" size:22.0]; 
     cell.videoDescription.font = [UIFont fontWithName:@"FranklinGothicStd-ExtraCond" size:16.0]; 
     cell.backgroundColor = [UIColor clearColor]; 
     cell.selectionStyle = UITableViewCellSelectionStyleNone; 

     return cell; 
    } 

    - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath 
    { 
     if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) 
     { 
      KFBYoutubeVideoView *videoView = [[KFBYoutubeVideoView alloc]init]; 
      videoView.videoIDString = [videoIDArray objectAtIndex:indexPath.row]; 
      videoView.videoTitle = [titleArray objectAtIndex:indexPath.row]; 
      videoView.videoDescription = [descriptionArray objectAtIndex:indexPath.row]; 
      [self.navigationController pushViewController:videoView animated:YES]; 
     } 
     else 
     { 
      KFBYoutubeVideoView *videoView = [[KFBYoutubeVideoView alloc]initWithNibName:nil bundle:nil]; 
      videoView.videoIDString = [videoIDArray objectAtIndex:indexPath.row]; 
      videoView.videoTitle = [titleArray objectAtIndex:indexPath.row]; 
      videoView.videoDescription = [descriptionArray objectAtIndex:indexPath.row]; 

      NSMutableArray *details = [self.splitViewController.viewControllers mutableCopy]; 

      UINavigationController *detailNav = [[UINavigationController alloc]initWithRootViewController:videoView]; 

      [details replaceObjectAtIndex:1 withObject:detailNav]; 

      KFBAppDelegate *appDelegate = (KFBAppDelegate *)[[UIApplication sharedApplication]delegate]; 
      appDelegate.splitViewController.viewControllers = details; 
      appDelegate.window.rootViewController = self.splitViewController; 
      appDelegate.splitViewController.delegate = videoView; 
      [appDelegate.splitViewController viewWillAppear:YES]; 
     } 

     [tableView deselectRowAtIndexPath:indexPath animated:YES]; 
    } 

    - (void)didReceiveMemoryWarning 
    { 
     [super didReceiveMemoryWarning]; 
     // Dispose of any resources that can be recreated. 
    } 

    @end
来源
2014-10-20 raginggoat
仅供参考 - 为什么要创建，设置并启动加载指示灯，然后检查网络状态？首先检查状态。如果你真的需要它，只显示加载指示器。 – rmaddy 2014-10-20 18:29:44
这是一个疏忽。 – raginggoat 2014-10-20 18:31:42
set delegate loadingIndicator.delegate = self; – ZAZ 2014-10-20 18:33:26
我想通了。在将loadingIndicator作为子视图添加后，tableView正在初始化。
来源
2014-10-21 14:18:56 raginggoat
UIActivityIndi​​catorView不出现

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UIActivityIndicatorView不出现
