Setting UIButton Image Using AFNetworking - objective-c

Question

I have this code in my project that creates UIButtons with labels and images with values coming from a web service.
- (void)getMoviePosterImages
{
for (int i = 0; i < [self.rowCount intValue]; i++)
{
NSArray *postersArray = [self.jsonMutableArray objectAtIndex:i];
AFImageRequestOperation *operation = [AFImageRequestOperation imageRequestOperationWithRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:[postersArray objectAtIndex:6]]] imageProcessingBlock:nil
success:^(NSURLRequest *request, NSHTTPURLResponse *response, UIImage *image)
{
[moviePosterButton setBackgroundImage:image forState:UIControlStateNormal];
}
failure:nil];
[operation start];
}
}
Here's the code where I created the UILabels:
- (void)displayMovieTitlesAndFrames
{
int imageCount = [self.rowCount intValue];
int offset_x = 21;
int offset_y = 24;
for (int i = 0; i < imageCount; i++)
{
// compute x & y offset
if (i % 3 == 0)
{
offset_x = 21;
}
else if (i % 3 == 1)
{
offset_x = 115;
}
else
{
offset_x = 210;
}
whiteBackgroundLabel = [[[UILabel alloc] initWithFrame:CGRectMake(offset_x, offset_y, MOVIE_THUMBNAIL_W, MOVIE_THUMBNAIL_H)] autorelease];
whiteBackgroundLabel.backgroundColor = [UIColor whiteColor];
whiteBackgroundLabel.layer.cornerRadius = 3.0;
whiteBackgroundLabel.layer.borderColor = [[UIColor lightGrayColor] CGColor];
whiteBackgroundLabel.layer.borderWidth = 1.0;
[scrollview addSubview:whiteBackgroundLabel];
moviePosterButton = [[UIButton buttonWithType:UIButtonTypeCustom] retain];
moviePosterButton.frame = CGRectMake(offset_x + 5, offset_y + 5, MOVIE_THUMBNAIL_W - 10, MOVIE_THUMBNAIL_H - 10);
moviePosterButton.backgroundColor = [UIColor clearColor];
[moviePosterButton setBackgroundImage:[UIImage imageNamed:#"placeholder.png"] forState:UIControlStateNormal];
moviePosterButton.tag = i;
[moviePosterButton addTarget:self
action:#selector(imageButtonPressed:)
forControlEvents:UIControlEventTouchUpInside];
[scrollview addSubview:moviePosterButton];
movieTitleLabel = [[[UILabel alloc] initWithFrame:CGRectMake(offset_x, offset_y + 143, 90, 20)] autorelease];
movieTitleLabel.backgroundColor = [UIColor whiteColor];
movieTitleLabel.layer.cornerRadius = 3.0;
movieTitleLabel.layer.borderColor = [[UIColor lightGrayColor] CGColor];
movieTitleLabel.layer.borderWidth = 1.0;
movieTitleLabel.font = [UIFont fontWithName:#"Helvetica" size:11.0];
movieTitleLabel.textColor = [UIColor darkGrayColor];
movieTitleLabel.textAlignment = UITextAlignmentCenter;
movieTitleLabel.numberOfLines = 1;
movieTitleLabel.text = [[self.jsonMutableArray objectAtIndex:i] objectAtIndex:1];
[scrollview addSubview:movieTitleLabel];
quickBuyButton = [[UIButton buttonWithType:UIButtonTypeCustom] retain];
quickBuyButton.frame = CGRectMake(offset_x + 1 + (MOVIE_THUMBNAIL_W - QUICK_BUY_BUTTON_W - 2), offset_y - 1 + 2, QUICK_BUY_BUTTON_W, QUICK_BUY_BUTTON_H);
quickBuyButton.backgroundColor = [UIColor clearColor];
[quickBuyButton setBackgroundImage:QUICK_BUY_BUTTON forState:UIControlStateNormal];
quickBuyButton.tag = i;
[quickBuyButton addTarget:self
action:#selector(quickBuyButtonPressed:)
forControlEvents:UIControlEventTouchUpInside];
[scrollview addSubview:quickBuyButton];
// increment offset
if (offset_x == 210)
{
offset_y += 171;
}
}
if ((offset_x == 21) || (offset_x == 115))
{
offset_y += 171;
}
[self adjustScrollViewAndBackground:offset_y];
}
All my UIButtons are created with their respective tags and I want to put their images on each on those buttons. The code above works only on the last UIButton created. I want to populate all of my buttons with images using the code above. Can someone tell me where I'm getting it all wrong?

Answer 1

In your getMoviePosterImages method you are setting an image to the moviePosterButton which might be the last button you just created so this is normal if only the last button gets its image. You need either to retrieve each buttons by their tags or build an array with all you buttons so you can easily access them. You could maybe do something like that:
- (void)getMoviePosterImages
{
for (int i = 0; i < [self.rowCount intValue]; i++)
{
NSArray *postersArray = [self.jsonMutableArray objectAtIndex:i];
AFImageRequestOperation *operation = [AFImageRequestOperation imageRequestOperationWithRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:[postersArray objectAtIndex:6]]] imageProcessingBlock:nil
success:^(NSURLRequest *request, NSHTTPURLResponse *response, UIImage *image)
{
[(UIButton *)buttonsArray[i] setBackgroundImage:image forState:UIControlStateNormal];
// or
// [(UIButton *)[self.view viewWithTag:i] setBackgroundImage:image forState:UIControlStateNormal];
}
failure:nil];
[operation start];
}
}
Hope this helps ;)