我有一个UIView并且我添加了点击手势
let tap = UITapGestureRecognizer(target: self, action: Selector("handleTap:"))
tap.delegate = self
myView.addGesture(tap)
我试图在testfile中以编程方式调用它。
sendActionForEvent
我正在使用这个函数，但它不起作用:
myView.sendActionForEvent(UIEvents.touchUpDown)
它显示未识别的选择器发送到实例。
我该如何解决这个问题呢?
当前回答
Swift 5.1三视图示例
步骤:1 ->添加storyboard视图和outlet viewController UIView
@IBOutlet var firstView: UIView!
@IBOutlet var secondView: UIView!
@IBOutlet var thirdView: UIView!
步骤:2 ->添加storyBoard视图标签
步骤:3 ->添加手势
override func viewDidLoad() {
super.viewDidLoad()
firstView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(self.tap(_:))))
firstView.isUserInteractionEnabled = true
secondView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(self.tap(_:))))
secondView.isUserInteractionEnabled = true
thirdView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(self.tap(_:))))
thirdView.isUserInteractionEnabled = true
}
步骤:4 -> select view
@objc func tap(_ gestureRecognizer: UITapGestureRecognizer) {
let tag = gestureRecognizer.view?.tag
switch tag! {
case 1 :
print("select first view")
case 2 :
print("select second view")
case 3 :
print("select third view")
default:
print("default")
}
}
其他回答
对于Swift 4:
let tap = UITapGestureRecognizer(target: self, action: #selector(self.handleTap(_:)))
view.addGestureRecognizer(tap)
view.isUserInteractionEnabled = true
self.view.addSubview(view)
// function which is triggered when handleTap is called
@objc func handleTap(_ sender: UITapGestureRecognizer) {
print("Hello World")
}
在Swift 4中，你需要显式地指出触发的函数是可从Objective-C调用的，所以你需要添加@objc你的handleTap函数。
请看@Ali Beadle的回答:Swift 4添加手势:覆盖vs @objc
Swift 5.1三视图示例
步骤:1 ->添加storyboard视图和outlet viewController UIView
@IBOutlet var firstView: UIView!
@IBOutlet var secondView: UIView!
@IBOutlet var thirdView: UIView!
步骤:2 ->添加storyBoard视图标签
步骤:3 ->添加手势
override func viewDidLoad() {
super.viewDidLoad()
firstView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(self.tap(_:))))
firstView.isUserInteractionEnabled = true
secondView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(self.tap(_:))))
secondView.isUserInteractionEnabled = true
thirdView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(self.tap(_:))))
thirdView.isUserInteractionEnabled = true
}
步骤:4 -> select view
@objc func tap(_ gestureRecognizer: UITapGestureRecognizer) {
let tag = gestureRecognizer.view?.tag
switch tag! {
case 1 :
print("select first view")
case 2 :
print("select second view")
case 3 :
print("select third view")
default:
print("default")
}
}
我使用的是Xcode 7.3.1, Swift 2.2。见下文。
func addTapGesture() {
let tap = UITapGestureRecognizer(target: self, action: #selector(MyViewController.handleTap))
tap.numberOfTapsRequired = 1
self.myView.addGestureRecognizer(tap)
}
func handleTap() {
// Your code here...
}
你需要用目标和动作初始化UITapGestureRecognizer，如下所示:
let tap = UITapGestureRecognizer(target: self, action: #selector(self.handleTap(_:)))
myView.addGestureRecognizer(tap)
然后，你应该实现处理程序，它将在每次tap事件发生时被调用:
@objc func handleTap(_ sender: UITapGestureRecognizer? = nil) {
// handling code
}
所以现在调用你的点击手势识别器事件处理程序就像调用一个方法一样简单:
handleTap()
斯威夫特4
首先，创建一个UITapGestureRecognizer对象
var tapGesture = UITapGestureRecognizer()
第二步是初始化UITapGestureReconizer。启用用户 交互，然后添加它。
override func viewDidLoad() {
super.viewDidLoad()
tapGesture = UITapGestureRecognizer(target: self, action: #selector(YourViewController.myviewTapped(_:)))
infosView.isUserInteractionEnabled = true
infosView.addGestureRecognizer(tapGesture)
view.addSubview(infosView)
}
第三，创建一个方法
@objc func myviewTapped(_ recognizer: UIGestureRecognizer) {
print("button is tapped")
}
