Question

我的iOS应用程序出现unrecognized selector sent错误。我尝试根据其他类似线程中提到的答案解决问题，但失败了。请看下面的代码，并帮助我。

由于

class ThirdViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.



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

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

        leftSwipe.direction = .left
        rightSwipe.direction = .right


        view.addGestureRecognizer(leftSwipe)
        view.addGestureRecognizer(rightSwipe)



    }



    func HandleSwipes(sender: UISwipeGestureRecognizer) {

        //if(sender.direction == .left)
        //{
        //    tabBarController?.selectedIndex = 1
        //}
    }
}

Answer 1

像这样写选择器。

Swift 2.3或更低。

let leftSwipe = UISwipeGestureRecognizer(target: self, action: #selector(HandleSwipes(_:)))
let rightSwipe = UISwipeGestureRecognizer(target: self, action: #selector(HandleSwipes(_:)))

Swift 3

let leftSwipe = UISwipeGestureRecognizer(target: self, action: #selector(HandleSwipes(sender:)))
let rightSwipe = UISwipeGestureRecognizer(target: self, action: #selector(HandleSwipes(sender:)))

注意：一个建议是电池方法名称始终以小写字母而不是大写字母开头。因此，如果您使用handleSwipes而不是HandleSwipes，那就更好了。

Answer 2

你需要像

一样打电话

  override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.


    let leftSwipe = UISwipeGestureRecognizer(target: self, action: #selector(HandleSwipes(_:)))

    let rightSwipe = UISwipeGestureRecognizer(target: self, action: #selector(HandleSwipes(_:)))

    leftSwipe.direction = .left
    rightSwipe.direction = .right


    view.addGestureRecognizer(leftSwipe)
    view.addGestureRecognizer(rightSwipe)
}

调用方法如

func HandleSwipes(_ sender: UISwipeGestureRecognizer){

    if(sender.direction == .left)
    {
       print("Swiped left")
    }
}

UISwipeGestureRecognizer抛出无法识别的选择器发送错误

2 个答案: