为什么这在《雨燕3》中行不通？它会在运行时崩溃,并表示：
“-[MY_APP_NAME.DisplayOtherappSCTRL TAP:]:无法识别的选择器已发送到实例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")
}
}
选择器（“tap：”）现在应该写成#selector(tap（GestureReconizer:))
此外，您应该按照新的Swift API指南将tap声明为func tap(_gesturerecognizer:UITapGestureRecognizer)，在这种情况下，您的选择器将变为#selector(tap(_:))。
在Swift3中，它的工作原理如下：
@IBOutlet var myView: UIView!
override func viewDidLoad() {
super.viewDidLoad()
let tap = UITapGestureRecognizer(target: self, action:#selector(handleTap))
myView.addGestureRecognizer(tap)
}
func handleTap() {
print("tapped")
}
Swift3提供了新的语法，因此不使用Selector（“tap：”），#Selector（tap（gestureReconizer：））是
