How to check if an ALAsset still exists using a URL

Question

I\'ve got an array containing ALAsset urls (not full ALAsset objects) So each time I start my application I want to check my array to see if it\'s still up to date...

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Answer 1

Having assets path you can use this function to check if image exist:

-(BOOL) imageExistAtPath:(NSString *)assetsPath
{  
    __block BOOL imageExist = NO; 
    ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
    [library assetForURL:[NSURL URLWithString:assetsPath] resultBlock:^(ALAsset *asset) {
        if (asset) {
            imageExist = YES;
            }
    } failureBlock:^(NSError *error) {
        NSLog(@"Error %@", error);
    }];
    return imageExist;
}

Remember that checking if image exist is checking asynchronyus. If you want to wait until new thread finish his life call function "imageExistAtPath" in main thread:

dispatch_async(dispatch_get_main_queue(), ^{
    [self imageExistAtPath:assetPath];
});

Or you can use semaphores, but this is not very nice solution:

-(BOOL) imageExistAtPath:(NSString *)assetsPath
{  
    __block BOOL imageExist = YES; 
    dispatch_semaphore_t semaphore = dispatch_semaphore_create(0);   
    dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,0);   
    dispatch_async(queue, ^{  
        ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
        [library assetForURL:[NSURL URLWithString:assetsPath] resultBlock:^(ALAsset *asset) {
            if (asset) {
                dispatch_semaphore_signal(semaphore); 
            } else {
                imageExist = NO;
                dispatch_semaphore_signal(semaphore); 
                }
        } failureBlock:^(NSError *error) {
             NSLog(@"Error %@", error);
        }];
    });
    dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER); 
    return imageExist;
}