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  | override func viewWillAppear(animated: Bool) { | |
| super.viewWillAppear(animated) | |
| NSNotificationCenter.defaultCenter().addObserver(self, selector: "returnFromBackground", name: UIApplicationDidBecomeActiveNotification, object: nil) | |
| } | |
| override func viewWillDisappear(animated: Bool) { | |
| super.viewWillDisappear(animated) | |
| NSNotificationCenter.defaultCenter().removeObserver(self,name: UIApplicationDidBecomeActiveNotification, object: nil) | |
| } | |
  
    
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  | func openURL(url: String) { | |
| var responder: UIResponder = self | |
| while responder.nextResponder() != nil { | |
| responder = responder.nextResponder()! | |
| NSLog("responder = %@", responder) | |
| if responder.respondsToSelector("openURL:") == true { | |
| responder.performSelector("openURL:", withObject: NSURL(string: url)) | |
| } | |
| } | |
| } | 
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