多个 UIButtons 的长按和点击识别器

Question

我的用户界面上有多个按钮，我想根据不同的点击类型执行不同的功能，

• 单击
• 双击
• 长按

单击一次对我来说很容易，一个连接了所有四个按钮的 IBAction，但对于其他类型的点击，我被卡住了，

我知道我需要使用点击手势识别器，但我无法将其设置为多个 UIButton，

这是我想做的例子

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UIGestureRecognizer 的一个实例用于多个按钮。每个按钮都需要自己的一组手势识别器。

这里有一个例子来告诉你怎么做：

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)")
}

为此，您必须为按钮添加 Outlets（button1、button2、button3、button4）。