How to execute ALAssetLibrary code with viewDidLoad: method in iOS?

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I am new in iOS programming so I am getting some serious problem in our code. I have getting problem in our asset library code, this code is written in the viewDidLoad: method but when I run the application viewDidLoad: method executes but my asset library code is not executing, it will execute after the execution of other method of application. So, the asset urls that I am fetching from the device library I am unable to display those data into our table view.
this is my assetLibrary code it is not executing with the viewDidLoad: method:

ALAssetLibrary *assetLibrary = [[ALAssetLibrary alloc] init];
[_assetLibrary enumerateGroupsWithTypes:ALAssetsGroupAll usingBlock:^(ALAssetsGroup *group, BOOL *stop){
 [group enumerateAssetsUsingBlock:^(ALAsset *result, NSUInteger index, BOOL *stop){
  if([[result valueForProperty:ALAssetPropertyType] isEqualToString:ALAssetTypePhoto]){
   [urls addObject:[result valueForProperty:ALAssetPropertyURLs]];
} failureBlock:^(NSError *error){

I google it but I don't find any perfect solution.
Please help me.

  1. Post:214

    Re: How to execute ALAssetLibrary code with viewDidLoad: method in iOS?

    The problem you are specifying is not unique so don't worry, every iOS developer face that problem.
    To execute ALAssetLibrary code with the viewDidLoad: method you need to implement dispatch_queue_t in your code and dispatch your queue in syncronized manner using dispatch_sync.
    Write your ALAssetLibrary code in this dispatch_queue_t code.
    See the code below:

    dispatch_queue_t gqueue = dispatch_get_global_queue
                              (DISPATCH_QUEUE_PRIORITY_HIGH, 0);
    dispatch_sync(gqueue, ^(void){
      ALAssetLibrary *assetLibrary = [[ALAssetLibrary alloc]init];
      [assetLibrary anumerateGroupsWithTypes:ALAssetsGroupAll
                    usingBlock:^(ALAssetsGroup *group, BOOL *stop){
                    // implement your asset library code here
      } failureBlock:^(NSError *error){
    gqueue = nil;

      Modified On Jan-18-2016 11:57:51 PM