ios swift3中的选择器
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Selector in swift3
提问by Chris
Why doesn't this work in swift 3 ? It crashes at runtime saying:
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'
'-[my_app_name.displayOtherAppsCtrl tap:]: 无法识别的选择器发送到实例 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")
}
}
回答by jjatie
Selector("tap:")should now be written as #selector(tap(gestureReconizer:))
Selector("tap:")现在应该写成 #selector(tap(gestureReconizer:))
Also, you should declare tap as func tap(_ gestureRecognizer: UITapGestureRecognizer)as per the new Swift API Guidelinesin which case your selector would then become #selector(tap(_:)).
此外，您应该func tap(_ gestureRecognizer: UITapGestureRecognizer)根据新的Swift API 指南声明 tap，在这种情况下，您的选择器将变为#selector(tap(_:)).
回答by Neen
In Swift 3 it works like this:
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")
}
回答by Zeeshan
Swift 3 came with new syntax so instead of using Selector("tap:"), #selector(tap(gestureReconizer:)) is
Swift 3 带来了新的语法，而不是使用 Selector("tap:")，#selector(tap(gestureReconizer:)) 是
回答by GeekMeng
Swift 3:
斯威夫特 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--")
}
