Objective C - 4 - 下载图片并且加载到View

#import "LoadInternetImageViewController.h"

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

@end

@implementation LoadInternetImageViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
	// Do any additional setup after loading the view, typically from a nib.

    [self loadImage];
}

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

- (void)loadImage
{
    NSString *imageUrlString = @"http://d.hiphotos.baidu.com/image/pic/item/7af40ad162d9f2d3940b70e5abec8a136327cca6.jpg";

    UIImage *downloadedImage = [self downloadImage:imageUrlString];

    if(downloadedImage)
    {
        NSLog(@"Setting downloaded image to imageView.");
//        self.imageView.contentMode = UIViewContentModeScaleAspectFit;
        self.imageView.image = downloadedImage;
    }
    else
    {
        NSLog(@"Unable to find downloaded image.");
    }
}

-(UIImage *)downloadImage:(NSString *)imageUrlString
{
    NSData *imageStream = [NSData dataWithContentsOfURL:[NSURL URLWithString:imageUrlString]];

    if (imageStream) {

        return [UIImage imageWithData:imageStream];

    }

    return nil;
}

@end