swift3中的选择器 [英] Selector in swift3

问题描述

为什么这不适用于swift 3？它在运行时崩溃说：

Why doesn't this work in swift 3 ? It crashes at runtime saying:

' - [my_app_name.displayOtherAppsCtrl tap：]：无法识别的选择器发送
到实例0x17eceb70'

'-[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")
}
}

推荐答案

选择器（点击：）现在应写为 #selector（点击（gestureReconizer： ））

此外，你应该声明点击为 func tap（_ gestureRecognizer：UITapGestureRecog nizer）根据新的 Swift API指南，在这种情况下你的选择器会成为 #selector（tap（_：））。

Also, you should declare tap as func tap(_ gestureRecognizer: UITapGestureRecognizer) as per the new Swift API Guidelines in which case your selector would then become #selector(tap(_:)).

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