没有用Objective-C选择器声明的方法（'nextPage'）

Question

自从我更新到7.3.1后，xcode创建了一些警告：“没有用Objective-C选择器声明的方法（'nextPage'）”。 我不确定我现在需要做什么。 这两行产生警告：

let leftSwipe = UISwipeGestureRecognizer (target: self, action: Selector("nextPage"))
let rightSwipe = UISwipeGestureRecognizer (target: self, action: Selector("nextPage"))

这是整个VC代码：

import Foundation
import UIKit
class VC1 : UIViewController {

class MyCustomNavigationController: UINavigationController {

    override func supportedInterfaceOrientations() -> UIInterfaceOrientationMask {

        return (visibleViewController?.supportedInterfaceOrientations())!

    }


    override func shouldAutorotate() -> Bool {

        return (visibleViewController?.shouldAutorotate())!

    }

}

override func supportedInterfaceOrientations() -> UIInterfaceOrientationMask {

    return UIInterfaceOrientationMask.Portrait

}

override func shouldAutorotate() -> Bool {

    return true

}

override func viewDidLoad() {

    super.viewDidLoad()

    func nextPage(sender:UISwipeGestureRecognizer) {

        switch sender.direction {



        case UISwipeGestureRecognizerDirection.Left:

            print("SWIPED LEFT", terminator: "")

            self.performSegueWithIdentifier("seg1", sender: nil)

        default:

            break

        }


    let leftSwipe = UISwipeGestureRecognizer (target: self, action: Selector("nextPage"))

    let rightSwipe = UISwipeGestureRecognizer (target: self, action: Selector("nextPage"))


    leftSwipe.direction = .Left

    rightSwipe.direction = .Right



    view.addGestureRecognizer(leftSwipe)

    view.addGestureRecognizer(rightSwipe)

}

    }

}

我在研究时发现了这个：

选择器（“funcName”）已更改为#selector（ClassName.funcName）

我想“funcName”将是nextPage，但我必须设置为ClassName？

不幸的是，xcode没有提供任何解决此问题的建议。 希望你能帮忙。 谢谢。

Answer 1

您需要将nextPage放在viewDidLoad() ，然后#selector(VC1.nextPage)

func nextPage(sender:UISwipeGestureRecognizer) {

    switch sender.direction {
        case UISwipeGestureRecognizerDirection.Left:

        print("SWIPED LEFT", terminator: "")

        self.performSegueWithIdentifier("seg1", sender: nil)

       default:

        break

    }
}

override func viewDidLoad() {

   super.viewDidLoad()

   let leftSwipe = UISwipeGestureRecognizer (target: self, action:  #selector(VC1.nextPage))

   let rightSwipe = UISwipeGestureRecognizer (target: self, action:  #selector(VC1.nextPage))
}