ios - UIAlertController 在最新的 Xcode 中显示错误

Question

我正在创建一个简单的警报，但它向我显示了此错误。

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    @IBAction func but (action:UIButton) {

        let alertcontroller = UIAlertController(title: "Title", message: "message", preferredStyle: .Alert)

        let alert = UIAlertAction(title: "Action titel", style: .Default, handler: nil)
        alertcontroller.addAction(alert)
        self.presentedViewController  (alertcontroller, animated:true, completion: nil)

           }

}

Answer 1

它必须是 presentViewController(...) 而不是 presentedViewController(...)