[swift]画像を非同期でロードするextensions - QiitaUIImageをURLから非同期でロードしたい時のextensions。エラー処理とか全く入れてないけど... extension UIImage { class func loadAsyncFromURL(urlString: String, callback: (UIImage?) -> ()) { dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), { let url = NSURL(string: urlString) var err: NSError? let imageData = NSData(contentsOfURL: url!, options: NSDataReadingOptions.DataReadingMappedIfSafe, error: &err) va
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