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?
如果你想要Objective - C代码,如下所示,
UITapGestureRecognizer *gesRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTap:)]; // Declare the Gesture.
gesRecognizer.delegate = self;
[yourView addGestureRecognizer:gesRecognizer]; // Add Gesture to your view.
// Declare the Gesture Recognizer handler method.
- (void)handleTap:(UITapGestureRecognizer *)gestureRecognizer{
NSLog(@"Tapped");
}
或者你想要swift代码如下所示,
import UIKit
class ViewController: UIViewController {
@IBOutlet weak var myView: UIView!
override func viewDidLoad() {
super.viewDidLoad()
// Add tap gesture recognizer to view
let tapGesture = UITapGestureRecognizer(target: self, action: Selector("handleTap:"))
myView.addGestureRecognizer(tapGesture)
}
// this method is called when a tap is recognized
func handleTap(sender: UITapGestureRecognizer) {
print("tap")
}
}
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")
}
}
}
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)
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