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
对于任何想要激活视图点击手势识别器而没有直接访问手势识别器的人…当返回到一个页面时，我必须填充之前通过点击填充的气泡。我一直在跟踪那些泡泡标签……
func fillBubs(bubs: [Int]) {
for bub in bubs {
let bubble = view.viewWithTag(bub)
if bubble == nil {continue}
for g in bubble!.gestureRecognizers! {
let tap = g as! UITapGestureRecognizer
handleBub(tap)
}
}
}
@objc func handleBub(_ sender: UITapGestureRecognizer? = nil) {
let bubble = sender?.view!
bubble?.layer.backgroundColor = #colorLiteral(red: 0, green: 0, blue: 0, alpha: 1)
}
其他回答
这是它在Swift 3中的工作原理:
@IBOutlet var myView: UIView!
override func viewDidLoad() {
super.viewDidLoad()
let tap = UITapGestureRecognizer(target: self, action:#selector(handleTap))
myView.addGestureRecognizer(tap)
}
func handleTap() {
print("tapped")
}
注意:不要忘记在视图上启用交互:
let tap = UITapGestureRecognizer(target: self, action: #selector(handleTap))
view.addGestureRecognizer(tap)
// view.userInteractionEnabled = true
self.view.addSubview(view)
对于任何想要激活视图点击手势识别器而没有直接访问手势识别器的人…当返回到一个页面时，我必须填充之前通过点击填充的气泡。我一直在跟踪那些泡泡标签……
func fillBubs(bubs: [Int]) {
for bub in bubs {
let bubble = view.viewWithTag(bub)
if bubble == nil {continue}
for g in bubble!.gestureRecognizers! {
let tap = g as! UITapGestureRecognizer
handleBub(tap)
}
}
}
@objc func handleBub(_ sender: UITapGestureRecognizer? = nil) {
let bubble = sender?.view!
bubble?.layer.backgroundColor = #colorLiteral(red: 0, green: 0, blue: 0, alpha: 1)
}
我想指出两点，这两点一直给我带来麻烦。
I was creating the Gesture Recognizer on init and storing it in a let property. Apparently, adding this gesture recog to the view does not work. May be self object passed to the gesture recognizer during init, is not properly configured. The gesture recognizer should not be added to views with zero frames. I create all my views with zero frame and then resize them using autolayout. The gesture recognizers have to be added AFTER the views have been resized by the autolayout engine. So I add the gesture recognizer in viewDidAppear and they work.
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()
