UIImageView Category to show an activity indicator when downloading images form internet using SDWebImage

UIImageView+WebCacheWithActivityIndicator.h

//
//  UIImageView+WebCacheWithActivityIndicator.h
//
//  Created by Paulo Miguel Almeida on 2/3/14.
//

#import <UIKit/UIKit.h>

#import <SDWebImage/UIImageView+WebCache.h>

@interface UIImageView (WebCacheWithActivityIndicator)

- (void)setImageShowingActivityIndicatorWithURL:(NSURL *)url completed:(SDWebImageCompletedBlock)completedBlock;

@end

UIImageView+WebCacheWithActivityIndicator.m

//
//  UIImageView+WebCacheWithActivityIndicator.m
//
//  Created by Paulo Miguel Almeida on 2/3/14.
//

#import "UIImageView+WebCacheWithActivityIndicator.h"

@implementation UIImageView (WebCacheWithActivityIndicator)

- (void)setImageShowingActivityIndicatorWithURL:(NSURL *)url completed:(SDWebImageCompletedBlock)completedBlock
{
    UIActivityIndicatorView* activityIndication = [[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
    
    [activityIndication setFrame:CGRectMake((self.frame.size.width - activityIndication.frame.size.width) / 2 , (self.frame.size.height - activityIndication.frame.size.height) / 2 , activityIndication.frame.size.width , activityIndication.frame.size.width)];
    [self addSubview:activityIndication];
    
    [activityIndication startAnimating];
    
    [self setImageWithURL:url completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType) {
        
        if(completedBlock)
        {
            completedBlock(image,error,cacheType);
        }
        
        [activityIndication stopAnimating];
        [activityIndication removeFromSuperview];
    }];
}
@end