CODEWITHSUNDEEP
iosobjective-cuiimagensmutablearray
lazarus
lazarus

Reputation: 85

Creating UIImage array

I've written code that gathers images from JSON requests and attempts to add them to an NSMutableArray to be used later in a table view. The problem is after adding the image objects to the array, the size of my NSMutableArray is 0. Here is the relevant code:

@implementation example{
    NSMutableArray *_placeImages;
}

-(void)viewDidLoad{
    ...
    _placeImages = [[NSMutableArray alloc] init];
}

-(void)JsonQuery {
    ...
    // Retrieve the results of the URL.
    dispatch_async(kMyQueue, ^{
    [self downloadImages];
    [self performSelectorOnMainThread:@selector(reloadTableData) withObject:NULL waitUntilDone:YES];
    });
}

-(void)downloadImages{
     ...
     NSData* data = [NSData dataWithContentsOfURL: url];
    UIImage* image = [UIImage imageWithData:data];
    [_placeImages addObject:image];
}

Upvotes: 0

Views: 86

Answers (1)

Tran Quan
Tran Quan

Reputation: 1086

you must alloc NSMutableArray first:

_placeImages = [[NSMutableArray alloc] init];

or you can using lazy init:

- (NSMutableArray *)placeImages
{
    if (!_placeImages) {
       _placeImages = [[NSMutableArray alloc] init];
    }
    return _placeImages
}

Upvotes: 3

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