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
以下是在Swift 5中添加手势视图的最简单方法
import UIKit
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
addGestures()
}
// MARK: Add Gestures to target view
func addGestures()
{
// 1. Single Tap or Touch
let tapGesture = UITapGestureRecognizer(target: self, action: #selector(self.tapGetstureDetected))
tapGesture.numberOfTapsRequired = 1
view.addGestureRecognizer(tapGesture)
//2. Double Tap
let doubleTapGesture = UITapGestureRecognizer(target: self, action: #selector(self.doubleTapGestureDetected))
doubleTapGesture.numberOfTapsRequired = 2
view.addGestureRecognizer(doubleTapGesture)
//3. Swipe
let swipeGesture = UISwipeGestureRecognizer(target: self, action: #selector(self.swipeGetstureDetected))
view.addGestureRecognizer(swipeGesture)
//4. Pinch
let pinchGesture = UIPinchGestureRecognizer(target: self, action: #selector(self.pinchGetstureDetected))
view.addGestureRecognizer(pinchGesture)
//5. Long Press
let longPressGesture = UILongPressGestureRecognizer(target: self, action: #selector(self.longPressGetstureDetected))
view.addGestureRecognizer(longPressGesture)
//6. Pan
let panGesture = UILongPressGestureRecognizer(target: self, action: #selector(self.panGestureDetected))
view.addGestureRecognizer(panGesture)
}
// MARK: Handle Gesture detection
@objc func swipeGetstureDetected() {
print("Swipe Gesture detected!!")
}
@objc func tapGetstureDetected() {
print("Touch/Tap Gesture detected!!")
}
@objc func pinchGetstureDetected() {
print("Pinch Gesture detected!!")
}
@objc func longPressGetstureDetected() {
print("Long Press Gesture detected!!")
}
@objc func doubleTapGestureDetected() {
print("Double Tap Gesture detected!!")
}
@objc func panGestureDetected()
{
print("Pan Gesture detected!!")
}
//MARK: Shake Gesture
override func becomeFirstResponder() -> Bool {
return true
}
override func motionEnded(_ motion: UIEvent.EventSubtype, with event: UIEvent?){
if motion == .motionShake
{
print("Shake Gesture Detected")
}
}
}
其他回答
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.
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")
}
试试下面的扩展
extension UIView {
func addTapGesture(action : @escaping ()->Void ){
let tap = MyTapGestureRecognizer(target: self , action: #selector(self.handleTap(_:)))
tap.action = action
tap.numberOfTapsRequired = 1
self.addGestureRecognizer(tap)
self.isUserInteractionEnabled = true
}
@objc func handleTap(_ sender: MyTapGestureRecognizer) {
sender.action!()
}
}
class MyTapGestureRecognizer: UITapGestureRecognizer {
var action : (()->Void)? = nil
}
然后使用它:
submitBtn.addTapGesture {
//your code
}
你甚至可以把它用于cell
cell.addTapGesture {
//your code
}
以下是在Swift 5中添加手势视图的最简单方法
import UIKit
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
addGestures()
}
// MARK: Add Gestures to target view
func addGestures()
{
// 1. Single Tap or Touch
let tapGesture = UITapGestureRecognizer(target: self, action: #selector(self.tapGetstureDetected))
tapGesture.numberOfTapsRequired = 1
view.addGestureRecognizer(tapGesture)
//2. Double Tap
let doubleTapGesture = UITapGestureRecognizer(target: self, action: #selector(self.doubleTapGestureDetected))
doubleTapGesture.numberOfTapsRequired = 2
view.addGestureRecognizer(doubleTapGesture)
//3. Swipe
let swipeGesture = UISwipeGestureRecognizer(target: self, action: #selector(self.swipeGetstureDetected))
view.addGestureRecognizer(swipeGesture)
//4. Pinch
let pinchGesture = UIPinchGestureRecognizer(target: self, action: #selector(self.pinchGetstureDetected))
view.addGestureRecognizer(pinchGesture)
//5. Long Press
let longPressGesture = UILongPressGestureRecognizer(target: self, action: #selector(self.longPressGetstureDetected))
view.addGestureRecognizer(longPressGesture)
//6. Pan
let panGesture = UILongPressGestureRecognizer(target: self, action: #selector(self.panGestureDetected))
view.addGestureRecognizer(panGesture)
}
// MARK: Handle Gesture detection
@objc func swipeGetstureDetected() {
print("Swipe Gesture detected!!")
}
@objc func tapGetstureDetected() {
print("Touch/Tap Gesture detected!!")
}
@objc func pinchGetstureDetected() {
print("Pinch Gesture detected!!")
}
@objc func longPressGetstureDetected() {
print("Long Press Gesture detected!!")
}
@objc func doubleTapGestureDetected() {
print("Double Tap Gesture detected!!")
}
@objc func panGestureDetected()
{
print("Pan Gesture detected!!")
}
//MARK: Shake Gesture
override func becomeFirstResponder() -> Bool {
return true
}
override func motionEnded(_ motion: UIEvent.EventSubtype, with event: UIEvent?){
if motion == .motionShake
{
print("Shake Gesture Detected")
}
}
}
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)
