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
我是在swift上的Xcode 6.4上完成的。见下文。
var view1: UIView!
func assignTapToView1() {
let tap = UITapGestureRecognizer(target: self, action: Selector("handleTap"))
// tap.delegate = self
view1.addGestureRecognizer(tap)
self.view .addSubview(view1)
...
}
func handleTap() {
print("tap working")
view1.removeFromSuperview()
// view1.alpha = 0.1
}
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
对于正在寻找Swift 3解决方案的任何人
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")
}
let tap = UITapGestureRecognizer(target: self, action: Selector("handleFrontTap:"))
frontView.addGestureRecognizer(tap)
// Make sure this is not private
func handleFrontTap(gestureRecognizer: UITapGestureRecognizer) {
print("tap working")
}
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()
Swift 4的完整答案
步骤1:为视图创建一个出口
@IBOutlet weak var rightViewOutlet: UIView!
步骤2:定义一个点击手势
var tapGesture = UITapGestureRecognizer()
步骤3:创建ObjC函数(当视图被点击时调用)
@objc func rightViewTapped(_ recognizer: UIGestureRecognizer) {
print("Right button is tapped")
}
步骤4:在viewDidLoad()中添加以下内容
let rightTap = UITapGestureRecognizer(target: self, action: #selector(ViewController.rightViewTapped(_:)))
rightViewOutlet.addGestureRecognizer(rightTap)
