Loading/Downloading image from URL on Swift

I'd like to load an image from a URL in my application, so I first tried with Objective-C and it worked, however, with Swift, I've a compilation error:

> 'imageWithData' is unavailable: use object construction 'UIImage(data:)'

My function:

@IBOutlet var imageView : UIImageView

override func viewDidLoad() {
super.viewDidLoad()

var url:NSURL = NSURL.URLWithString("http://myURL/ios8.png")
var data:NSData = NSData.dataWithContentsOfURL(url, options: nil, error: nil)

imageView.image = UIImage.imageWithData(data)// Error here
}

In Objective-C:

- (void)viewDidLoad {
[super viewDidLoad];

NSURL *url = [NSURL URLWithString:(@"http://myURL/ios8.png")];
NSData *data = [NSData dataWithContentsOfURL:url];

_imageView.image = [UIImage imageWithData: data];
_labelURL.text = @"http://www.quentinroussat.fr/assets/img/iOS%20icon's%20Style/ios8.png";
}

Can someone please explain me why the `imageWithData:` doesn't work with Swift, and how can I solve the problem.