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POCollection <CALayerArray: 0x1cdb9b90> was mutated while being enumerated
 

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  1. POCollection <CALayerArray: 0x1cdb9b90> was mutated while being enumerated
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    <p>i realise this has been asked many times, but i just don't know where the fault lies in my code, sorry for being dumb. </p> <p>I do know the fault is from this method:</p> <pre><code>-(void)getDataFromDatabase { UIActivityIndicatorView *indicator = [[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray]; indicator.frame = CGRectMake(0.0, 0.0, 40.0, 40.0); indicator.center = self.view.center; [indicator bringSubviewToFront:self.view]; [UIApplication sharedApplication].networkActivityIndicatorVisible = TRUE; [indicator startAnimating]; CGRect screenRect = [[UIScreen mainScreen] bounds]; UIView *overlay = [[UIView alloc] initWithFrame:CGRectMake(0, 0, screenRect.size.width, screenRect.size.height)]; overlay.backgroundColor = [UIColor whiteColor]; [self.view addSubview:overlay]; [self.view addSubview:indicator]; NSString *listingurl; listingurl = [NSString stringWithFormat:@"http://www.herefordshire-tourism-guide.co.uk/app/query.php?getlisting=1&amp;listingname=%@", rowSelectedName]; listingurl = [listingurl stringByReplacingOccurrencesOfString:@" " withString:@"%20"]; NSURL *url = [NSURL URLWithString:listingurl]; NSError *error = nil; NSStringEncoding encoding; NSString *jsonreturn = [[NSString alloc] initWithContentsOfURL:url usedEncoding:&amp;encoding error:&amp;error]; NSData *jsonData = [jsonreturn dataUsingEncoding:NSUTF32BigEndianStringEncoding]; // In "real" code you should surround this with try and catch NSDictionary * dict = [[CJSONDeserializer deserializer] deserializeAsDictionary:jsonData error:&amp;error]; if (dict) { rows = dict[@"listings"]; } dict = rows[0]; self.photos.font = [UIFont fontWithName:@"ProximaNova-Regular" size:18.0]; self.likes.font = [UIFont fontWithName:@"ProximaNova-Regular" size:18.0]; self.businessName.font = [UIFont fontWithName:@"ProximaNova-Extrabld" size:20.0]; self.address.font = [UIFont fontWithName:@"ProximaNova-Regular" size:16.0]; self.navigationItem.title = dict[@"business"]; NSString *favdb = [NSString stringWithFormat:@"%@", dict[@"favs"]]; if ([favdb isEqualToString:@""]) { NSString *fav = [NSString stringWithFormat:@"0 Likes"]; self.favourites.text = fav; } else { NSString *fav = [NSString stringWithFormat:@"%@ Likes", dict[@"favs"]]; self.favourites.text = fav; } if ([favdb isEqualToString:@"1"]) { NSString *fav = [NSString stringWithFormat:@"1 Like"]; self.favourites.text = fav; } self.businessName.text = dict[@"business"]; self.address.text = dict[@"location"]; dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, (unsigned long)NULL), ^(void) { UIActivityIndicatorView *indicator = [[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray]; indicator.frame = CGRectMake(140, 85, 40.0, 40.0); [indicator bringSubviewToFront:self.view]; [indicator startAnimating]; [self.view addSubview:indicator]; UIImage *img = [[UIImage alloc] initWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:dict[@"image1"]]]]; self.image.image = img; [UIApplication sharedApplication].networkActivityIndicatorVisible = FALSE; [indicator stopAnimating]; }); listingLoc = [[CLLocation alloc] initWithLatitude:[dict[@"lat"] doubleValue] longitude:[dict[@"lon"] doubleValue]]; AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate]; float kilometers = [appDelegate.currentLoc distanceFromLocation:listingLoc] / 1000; int milesint = kilometers * 0.621371192; NSString *milesOut = [NSString stringWithFormat:@"%i miles", milesint]; self.distance.text = milesOut; networkImages = [[NSMutableArray alloc] init]; if (dict[@"image1"] != @"") { [networkImages addObject:dict[@"image1"]]; } [indicator stopAnimating]; [overlay removeFromSuperview]; } </code></pre> <p>and im calling that method in the viewWillAppear method...</p> <p><code>[self performSelectorInBackground:@selector(getDataFromDatabase) withObject:nil];</code></p> <p>Any tips, my code may be a bit shoddy, any help is much appreciated! </p> <p>Thanks.</p>
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    1. This table or related slice is empty.
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    1. USNoah Witherspoon
    1. USrjg
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
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      1. POCollection <CALayerArray: 0x1cdb9b90> was mutated while being enumerated
      1. This table or related slice is empty.
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    2. VO
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      1. POCollection <CALayerArray: 0x1cdb9b90> was mutated while being enumerated
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      1. POCollection <CALayerArray: 0x1cdb9b90> was mutated while being enumerated
      1. This table or related slice is empty.
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    1. COThat's a lot of code.Where do you iterate through the array elements?
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      1. POCollection <CALayerArray: 0x1cdb9b90> was mutated while being enumerated
      1. USRamy Al Zuhouri
    2. COWell, anytime that you interact with UIKit methods (like adding and removing subviews above) it must be done on the main thread, and not in a background thread like you are doing here. UIKit is **not** thread-safe!
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      1. POCollection <CALayerArray: 0x1cdb9b90> was mutated while being enumerated
      1. USlnafziger
 

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