Question

if (view.annotation.title as String!) == "Helgoland " {
  currentLong = 7.889021
  currentLat = 54.180210 
  url = "google.com"

  let alertController: UIAlertController = UIAlertController(title: "Change Map Type", message: nil, preferredStyle: UIAlertControllerStyle.Alert)
  let cancelAction: UIAlertAction = UIAlertAction(title: "Back", style: UIAlertActionStyle.Cancel, handler: nil)
  let button1action: UIAlertAction = UIAlertAction(title: "Product Page", style: UIAlertActionStyle.Default, handler: { (action: UIAlertAction!) -> () in
    performSegueWithIdentifier("showShop", sender: self)
  })
  let button2action: UIAlertAction = UIAlertAction(title: "Video", style: UIAlertActionStyle.Default, handler: { (action: UIAlertAction!) -> () in
    youtubeVideoID = "XX"
    UIApplication.sharedApplication().openURL(NSURL(string: "http://www.youtube.com/watch?v=\(youtubeVideoID)"))
  })
  alertController.addAction(cancelAction)
  alertController.addAction(button1action)
  alertController.addAction(button2action)
  self.presentViewController(alertController, animated: true, completion: nil)
}

我总是遇到错误

“关闭时隐式使用'self';使用'self'。捕获语义显性“

但如果我设置self.view，它也会失败。

Answer 1

您需要明确使用self：

self.performSegueWithIdentifier("showShop", sender: self)

对于Swift 3（thx @KingChintz）：

self.performSegue(withIdentifier: "showShop", sender: self)

Answer 2

对于Swift 3

 _ =  self.navigationController?.popToRootViewController(animated: false)

斯威夫特 - 执行塞格

2 个答案: