长按和点击识别器可用于多个UIButton

Question

我的UI上有多个按钮，我想根据不同的点击类型执行不同的功能，

• 一键点击
• 双击
• 长按

对于我来说，只需轻按一下即可完成操作，这是一个IBAction，所有四个按钮均已连接到IBAction，但对于其他类型的点击，我却无法控制

我了解我需要使用点击手势识别器，但是无法将其设置为多个UIButton，

这是我想做的事的例子

import UIKit

class ViewController: UIViewController {


@IBOutlet weak var Label: UILabel!

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}


func ButtonSingleTap(sender:UIButton!) {

    let ButtonNumber: String = String(sender.tag)
    Label.text = "Button " + ButtonNumber + " is Single Tapped"
}


func ButtonDoubleTap(sender:UIButton!) {

    let ButtonNumber: String = String(sender.tag)
    Label.text = "Button " + ButtonNumber + " is Double Tapped"
}


func ButtonLongTap(sender:UIButton!) {

    let ButtonNumber: String = String(sender.tag)
    Label.text = "Button " + ButtonNumber + " is Long Pressed"
}
}

Answer 1

您不能将的一个实例UIGestureRecognizer用于多个按钮。每个按钮都需要有自己的手势识别器集。

这是一个示例，向您展示如何做：

for button in [button1, button2, button3, button4] {
    let longPressRecognizer = UILongPressGestureRecognizer(target: self, action: Selector("didLongPress:"))
    let doubleTapRecognizer = UITapGestureRecognizer(target: self, action: Selector("didDoubleTap:"))
    doubleTapRecognizer.numberOfTapsRequired = 2
    button.addGestureRecognizer(longPressRecognizer)
    button.addGestureRecognizer(doubleTapRecognizer)
}

func didLongPress(recognizer: UILongPressGestureRecognizer) {
    guard let button = recognizer.view as? UIButton else { return }
    switch recognizer.state {
    case .Began:
        print("long press began button \(button.tag)")
    case .Ended:
        print("long press ended button \(button.tag)")
    default:
        break
    }
}

func didDoubleTap(recognizer: UITapGestureRecognizer) {
    guard let button = recognizer.view as? UIButton else { return }
    print("double tap button \(button.tag)")
}

对于这个工作，你必须添加奥特莱斯为您的按钮（button1，button2，button3，button4）。