swift3 中的选择器

Question

为什么这在 swift 3 中不起作用？它在运行时崩溃说：

'-[my_app_name.displayOtherAppsCtrl tap:]: unrecognized selector sent to instance 0x17eceb70'

    override func viewDidLoad() {
    super.viewDidLoad()

    // Uncomment the following line to preserve selection between presentations
    // self.clearsSelectionOnViewWillAppear = false

    // Register cell classes
    //self.collectionView!.register(ImageCell.self, forCellWithReuseIdentifier: reuseIdentifier)

    // Do any additional setup after loading the view.

  let lpgr = UITapGestureRecognizer(target: self, action: Selector("tap:"))
    lpgr.delegate = self
    collectionView?.addGestureRecognizer(lpgr)
}

func tap(gestureReconizer: UITapGestureRecognizer) {
if gestureReconizer.state != UIGestureRecognizerState.ended {
  return
}

let p = gestureReconizer.location(in: self.collectionView)
let indexPath = self.collectionView?.indexPathForItem(at: p)

if let index = indexPath {
  //var cell = self.collectionView?.cellForItem(at: index)
  // do stuff with your cell, for example print the indexPath
  print(index.row)
} else {
  print("Could not find index path")
}
}

Answer 1

Selector("tap:") 现在应该写成 #selector(tap(gestureReconizer:))

此外，您应该根据新的 Swift API Guidelines 将 tap 声明为 func tap(_ gestureRecognizer: UITapGestureRecognizer)，在这种情况下，您的选择器将变为 #selector(tap(_:))。

Answer 2

在 Swift 3 中它是这样工作的：

@IBOutlet var myView: UIView!
override func viewDidLoad() {
    super.viewDidLoad()

    let tap = UITapGestureRecognizer(target: self, action:#selector(handleTap))

    myView.addGestureRecognizer(tap)
}

func handleTap() {
    print("tapped")
}

Answer 3

Swift 3:

class MYPTempController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        let btn = UIButton(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
        view.addSubview(btn)
        btn.addTarget(self, action: #selector(MYPTempController.btnClick), for: .touchUpInside)
    }
    @objc fileprivate func btnClick() {
        print("--click--")
    }
}

//带参数
btn.addTarget(self, action: #selector(MYPTempController.btnClick(_:)), for: .touchUpInside)
//监听方法
func btnClick(_ sender: UIButton) {
    print("--click--")
}

Answer 4

Swift 3 带来了新的语法，而不是使用 Selector("tap:")，#selector(tap(gestureReconizer:)) 是

swift3 中的选择器

Selector in swift3

selector

ios

swift3