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
let tap = UITapGestureRecognizer(target: self, action: Selector("handleFrontTap:"))
frontView.addGestureRecognizer(tap)
// Make sure this is not private
func handleFrontTap(gestureRecognizer: UITapGestureRecognizer) {
print("tap working")
}
其他回答
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)
试试下面的swift代码(在Xcode 6.3.1中测试):
import UIKit
class KEUITapGesture150427 : UIViewController {
var _myTap: UITapGestureRecognizer?
var _myView: UIView?
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = UIColor.whiteColor();
_myTap = UITapGestureRecognizer(target: self
, action: Selector("_myHandleTap:"))
_myTap!.numberOfTapsRequired = 1
_myView = UIView(frame: CGRectMake(100, 200, 100, 100))
_myView!.backgroundColor=UIColor.blueColor()
_myView!.layer.cornerRadius = 20
_myView!.layer.borderWidth = 1
_myView!.addGestureRecognizer(_myTap!)
view.addSubview(_myView!)
}
func _myHandleTap(sender: UITapGestureRecognizer) {
if sender.state == .Ended {
println("_myHandleTap(sender.state == .Ended)")
sender.view!.backgroundColor
= UIColor(red: CGFloat(drand48()), green: CGFloat(drand48()), blue: CGFloat(drand48()), alpha: 1.0);
}
}
}
注意，你的目标可以是UIResponder的任何子类，参见(在Xcode 6.3.1中测试):
import UIKit
class MyTapTarget : UIResponder {
func _myHandleTap2(sender: UITapGestureRecognizer) {
if sender.state == .Ended {
println("_myHandleTap2(sender.state == .Ended)")
sender.view!.backgroundColor
= UIColor(red: CGFloat(drand48()), green: CGFloat(drand48()), blue: CGFloat(drand48()), alpha: 1.0);
}
}
}
class KEUITapGesture150427b : UIViewController {
var _myTap: UITapGestureRecognizer?
var _myView: UIView?
var _myTapTarget: MyTapTarget?
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = UIColor.whiteColor();
_myTapTarget = MyTapTarget()
_myTap = UITapGestureRecognizer(target: _myTapTarget!
, action: Selector("_myHandleTap2:"))
_myTap!.numberOfTapsRequired = 1
_myView = UIView(frame: CGRectMake(100, 200, 100, 100))
_myView!.backgroundColor=UIColor.blueColor()
_myView!.layer.cornerRadius = 20
_myView!.layer.borderWidth = 1
_myView!.addGestureRecognizer(_myTap!)
view.addSubview(_myView!)
}
}
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")
}
1 .
@IBOutlet var viewTap: UIView!
2 .
var tapGesture = UITapGestureRecognizer()
3 .
override func viewDidLoad() {
super.viewDidLoad()
// TAP Gesture
tapGesture = UITapGestureRecognizer(target: self, action: #selector(ViewController.myviewTapped(_:)))
tapGesture.numberOfTapsRequired = 1
tapGesture.numberOfTouchesRequired = 1
viewTap.addGestureRecognizer(tapGesture)
viewTap.isUserInteractionEnabled = true
}
4 .
func myviewTapped(_ sender: UITapGestureRecognizer) {
if self.viewTap.backgroundColor == UIColor.yellow {
self.viewTap.backgroundColor = UIColor.green
}else{
self.viewTap.backgroundColor = UIColor.yellow
}
}
输出
