如何在swift中以编程方式调用手势点击UIView

我有一个UIView,并且我已添加了点击手势:

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

我正在使用此功能,但它无法正常工作:

myView.sendActionForEvent(UIEvents.touchUpDown)

它显示发送到实例的无法识别的选择器.

我怎么解决这个问题？

提前致谢

1> Salavat Khan..：

---

您需要UITapGestureRecognizer使用目标和操作进行初始化,如下所示:

let tap = UITapGestureRecognizer(target: self, action: #selector(self.handleTap(_:)))
myView.addGestureRecognizer(tap)

然后,您应该实现处理程序,每次发生tap事件时都会调用该处理程序:

@objc func handleTap(_ sender: UITapGestureRecognizer? = nil) {
    // handling code
}

因此,现在调用您的tap手势识别器事件处理程序就像调用方法一样简单:

handleTap()

---

因为您已经设置了目标和操作,所以不需要"tap.delegate = self"

---

在Swift3中引发错误,你的手柄点击功能应该是:func handleTap(_ sender:UITapGestureRecognizer)

---

@muhasturk不要改变upvoted答案的含义.您的编辑使旧Swift版本的答案无效.如果您想发布Swift 2.2的更新,请发布您自己的答案.谢谢.

2> John Lim..：

---

对于任何正在寻找Swift 3解决方案的人

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
 func handleTap(_ sender: UITapGestureRecognizer) {
     print("Hello World")
  }

3> RNHTTR..：

---

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,你需要明确指出触发函数可以从Objective-C调用,所以你需要添加@objc你的handleTap函数.

请参阅@Ali Beadle的回答:Swift 4添加手势:覆盖vs @objc

4> 小智..：

---

只需注意 - 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)

5> Kirit Modi..：

---

步骤1

@IBOutlet var viewTap: UIView!

第2步

var tapGesture = UITapGestureRecognizer()

STEP: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
}

第4步

func myviewTapped(_ sender: UITapGestureRecognizer) {

    if self.viewTap.backgroundColor == UIColor.yellow {
        self.viewTap.backgroundColor = UIColor.green
    }else{
        self.viewTap.backgroundColor = UIColor.yellow
    }
}

OUTPUT

6> Museer Ahama..：

---

实现轻击手势

let tap: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: "touchHappen") 
view.userInteractiOnEnabled= true
view.addGestureRecognizer(tap)

识别出水龙头时调用此功能.

func touchHappen() {
    //Causes the view (or one of its embedded text fields) to resign the first responder status.
    self.view.endEditing(true)
}

For Swift 3的更新

let tap = UITapGestureRecognizer(target: self, action: #selector(self.touchHappen(_:)))
view.addGestureRecognizer(tap)
view.userInteractiOnEnabled= true

func touchHappen(_ sender: UITapGestureRecognizer) {
    print("Hello Museer")
}

7> Giang..：

---

斯威夫特4

let tap = UITapGestureRecognizer(target: self, action: #selector(self.touchTapped(_:)))
    self.view.addGestureRecognizer(tap)

@objc func touchTapped(_ sender: UITapGestureRecognizer) {
}

8> 小智..：

---

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")
}

9> A.G..：

---

我在swift上研究了Xcode 6.4.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
}

10> 小智..：

---

Swift 4的完整答案

步骤1：为视图创建出口

@IBOutlet weak var rightViewOutlet: UIView!

步骤2：定义轻击手势

var tapGesture = UITapGestureRecognizer()

步骤3：创建ObjC函数（在点击视图时调用）

@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)

11> 小智..：

---

您需要使用目标和操作初始化UITapGestureRecognizer,如下所示:

let tap = UITapGestureRecognizer(target: self, action: "handleTap:")
tap.delegate = self
myView.addGestureRecognizer(tap)

然后,您应该实现处理程序,每次发生tap事件时都会调用该处理程序:

func handleTap(sender: UITapGestureRecognizer) {
  // handling code
}

12> Iyyappan Rav..：

---

如果要在下面给出目标C代码，

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");
}

或者您想在下面给出快速代码，

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")
    }
}