ExampleViewerViewController.m

//
//  ExampleViewerViewController.m
//
//
//  Created by Murray Cumming on 15/06/2015.
//
//

#import "ExampleViewerViewController.h"

@interface ExampleViewerViewController ()
@property (weak, nonatomic) IBOutlet UIImageView *imageView;

@end

@implementation ExampleViewerViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/


- (void) setUrl:(NSString *)url {
    NSURL *imageURL = [NSURL URLWithString:url];

    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0), ^{
        NSData *imageData = [NSData dataWithContentsOfURL:imageURL];

        dispatch_async(dispatch_get_main_queue(), ^{
            // Update the UI
            self.imageView.image = [UIImage imageWithData:imageData];
        });
    });
}

@end