Dev iphone - l'indicateur d'activité avec NSThread ne fonctionne pas sur la vue tableau du contrôleur Nav

Question

Je n'arrive vraiment pas à le faire fonctionner. En fait, lorsque mes flux JSON se chargent, je veux que l'indicateur s'affiche, puis se cache lorsqu'il est arrêté.

Il charge les éléments du menu de premier niveau "Publishing, Broadcasting, Marketing Services", puis, lorsque Broadcasting est sélectionné, il charge un flux utilisant le cadre JSON hébergé sur Google. Lors de ce chargement, j'appelle startIndicator et stopIndicator en utilisant le NSThread. Ai-je manqué quelque chose ?

@implementation GeneralNewsTableViewController

@synthesize dataList;
@synthesize generalNewsDetailViewController;
@synthesize atLevel;

-(void) startIndicator
{
 NSAutoreleasePool *pool = [[NSAutoreleasePool alloc ] init ];
 [(UIActivityIndicatorView *)[self navigationItem].rightBarButtonItem.customView startAnimating];
 [pool release];

}

-(void) stopIndicator
{
  NSAutoreleasePool *pool = [[NSAutoreleasePool alloc ] init ];
 [(UIActivityIndicatorView *)[self navigationItem].rightBarButtonItem.customView stopAnimating];
 [pool release];

}

- (void)viewDidLoad {

 NSMutableArray *checker = self.dataList;

 if(checker == nil)
 {
  self.title = NSLocalizedString(@"General1",@"General News");

  NSMutableArray *array = [[NSArray alloc] initWithObjects:@"Publishing", @"Broadcasting",@"Marketing Services",nil];
  self.dataList = [array retain];
  self.atLevel = @"level1";
  [array release];
 }

  UIActivityIndicatorView * activityIndicator = [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(0, 0, 20, 20)];
  //set the initial property
  [activityIndicator stopAnimating];
  [activityIndicator hidesWhenStopped];
  //Create an instance of Bar button item with custome view which is of activity indicator
  UIBarButtonItem * barButton = [[UIBarButtonItem alloc] initWithCustomView:activityIndicator];
  //Set the bar button the navigation bar
  [self navigationItem].rightBarButtonItem = barButton;
  //Memory clean up
  [activityIndicator release];
  [barButton release];

 [super viewDidLoad];
}

 - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
 {
  NSString *level = self.atLevel;
  if([level isEqualToString:@"level2"])
  {
   return 70.0f;
  }
  else
  {
   return 40.0f;

  }
 }

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
 static NSString *FirstLevelCell = @"FirstLevelCell";

 UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:FirstLevelCell];
 if(cell == nil)
 {
  cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:FirstLevelCell] autorelease];
 }

 NSInteger row = [indexPath row]; 

 NSString *level = self.atLevel;
 if([level isEqualToString:@"level2"])
 { 
  NSMutableArray *stream = [self.dataList objectAtIndex:row];
  NSString *newsTitle = [stream valueForKey:@"title"];

  if( ![newsTitle isKindOfClass:[NSString class]] )
  {
   cell.textLabel.text =  @"";
  }
  else 
  {
   cell.textLabel.text = [stream valueForKey:@"title"]; 
  }

   cell.textLabel.numberOfLines = 2;
   cell.textLabel.font =[UIFont systemFontOfSize:10];

   cell.detailTextLabel.numberOfLines = 1;
   cell.detailTextLabel.font= [UIFont systemFontOfSize:8];
   cell.detailTextLabel.text = [stream valueForKey:@"created"];

   NSData *imageURL = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:@"http://www.website.co.uk/images/stories/img.jpg"]];
   UIImage *newsImage = [[UIImage alloc] initWithData:imageURL];

   cell.imageView.image = newsImage;

   [imageURL release];
   [newsImage release];
 }
 else 
 {
  cell.textLabel.text = [dataList objectAtIndex:row];
 }

 return cell;
}

- (void) tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
 NSUInteger row = [indexPath row]; 
 NSMutableString *levelType = (NSMutableString *) [dataList objectAtIndex:row];

 if(![levelType isKindOfClass:[NSString class]])
 {
  if(self.generalNewsDetailViewController == nil)
  {
   GeneralNewsDetailViewController *generalDetail = [[GeneralNewsDetailViewController alloc] initWithNibName:@"GeneralNewsDetailView" bundle:nil];
   self.generalNewsDetailViewController = generalDetail;
   [generalDetail release];
  }

  NSDictionary *stream = [self.dataList objectAtIndex:row];

  NSString *newsTitle = [stream valueForKey:@"title"];

  if( ![newsTitle isKindOfClass:[NSString class]] )
  {
   generalNewsDetailViewController.newsTitle =  @"";
  }
  else 
  {
   generalNewsDetailViewController.newsTitle =[stream valueForKey:@"title"]; 
  }

  generalNewsDetailViewController.newsId = [stream valueForKey:@"id"];
  generalNewsDetailViewController.fullText = [stream valueForKey:@"fulltext"];
  generalNewsDetailViewController.newsImage = [stream valueForKey:@"images"];
  generalNewsDetailViewController.created = [stream valueForKey:@"created"];

  HowDo_v1AppDelegate *delegate = [[UIApplication sharedApplication] delegate];
  [delegate.generalNewsNavController pushViewController:self.generalNewsDetailViewController animated:YES];

 }
 else
 {

  GeneralNewsTableViewController
   *generalSubDetail = [[GeneralNewsTableViewController alloc] initWithNibName:@"GeneralNewsTableView" bundle:nil];

  NSMutableArray *array;
  NSString *titleSelected = (NSString *) [dataList objectAtIndex:row];

  if([titleSelected isEqualToString:@"Publishing"])
  {
   generalSubDetail.title = @"Publishing news detail";
   array = [[NSArray alloc] initWithObjects:@"pub News1", @"pub News2",@"pub News3",nil];
   generalSubDetail.atLevel = @"level1";
  }
  else if ([titleSelected isEqualToString:@"Broadcasting"])
  {
   generalSubDetail.title = @"Broadcasting news detail";

  /// START  
 [self performSelectorOnMainThread:@selector(startIndicator) withObject:nil waitUntilDone:YES];

   if(jSONDataAccessWrapper == nil)
   {
    jSONDataAccessWrapper = [JSON_DataAccess_Wrapper alloc];
   } 
   array = [jSONDataAccessWrapper downloadJSONFeed];

 [self performSelectorOnMainThread:@selector(stopIndicator) withObject:nil waitUntilDone:YES];

   generalSubDetail.atLevel = @"level2";
  }
  else if ([titleSelected isEqualToString:@"Marketing Services"])
  {
   generalSubDetail.title = @"Marketing Services news detail";
   array = [[NSArray alloc] initWithObjects:@"Marketing News1", @"Marketing News2",@"Marketing News3",nil];
   generalSubDetail.atLevel = @"level1";
  }
  generalSubDetail.dataList = array;

  [self.navigationController pushViewController:generalSubDetail animated:YES];

  [titleSelected release];

 } 

}

- (NSInteger)tableView:(UITableView *)table numberOfRowsInSection:(NSInteger)section
//- (NSInteger) tableView:(UITableView *)tableView numberOfRowsInSection:(NSIndexPath *) section
{
 return [self.dataList count]; 
}

Merci pour tout commentaire

Cadres

Answer 1

Il est généralement recommandé par Apple que les opérations sur l'interface utilisateur doivent être effectuées sur le thread principal.

Ce que vous pouvez faire, c'est reporter le rappel dans le thread principal :

- (void)startIndicator
{
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    [self performSelectorOnMainThread:@selector(startAnimating:) withObject:nil waitUntilDone:NO];
    [pool release];
}

- (void)startAnimating:(id)sender
{
    [(UIActivityIndicatorView *)[self navigationItem].rightBarButtonItem.customView startAnimating];
}

Consultez le Guide du fil d'Apple. Il contient des informations utiles.