如何在我的Swift应用程序中实现UIGestureRecognitor？

假设我有一个树的图像，当我点击屏幕时，它会变成一个汽车的图像，我该怎么做？这是我到目前为止的代码，但它不起作用（我有三张名为“gp1”、“gp2”和“gp3”的图像，它们都有不同的点击次数来更改图像。）

我使用的是Spritekit和Swift

class GameScene: SKScene, SKPhysicsContactDelegate {

  //Create Touch
  createTouch()

}


override func didMoveToView(view: SKView) {

  func createTouch() {

    gestureRecognizer.numberOfTapsRequired = 1
    gestureRecognizer2.numberOfTapsRequired = 2
    gestureRecognizer3.numberOfTapsRequired = 3

    gestureRecognizer == UITapGestureRecognizer(target: self, action: "gp2")
    gestureRecognizer2 == UITapGestureRecognizer(target: self, action: "gp3")
    gestureRecognizer3 == UITapGestureRecognizer(target: self, action: "gp1")

  }

}

---

您需要将识别器添加到视图中，并实现动作处理程序

gp2

等

---

对于

UIImageView

您还应该确保

userInteractionEnabled

设置为true。

正如Mundi所说，对于每个UIImageView，确保userInteractionEnabled=true。否则，用户将无法点击图像。然后，创建手势识别器。将动作设置为将处理手势的方法。接下来，将手势识别器添加到UIImageView。最后，编写处理手势的方法

@IBOutlet var gp1: UIImageView!
@IBOutlet var gp2: UIImageView!
@IBOutlet var gp3: UIImageView!

func createTouch() {
    // maker sure userInteractionEnabled is true
    gp1.userInteractionEnabled = true;
    gp2.userInteractionEnabled = true;
    gp3.userInteractionEnabled = true;

    // create the gesture recognizers
    let gestureRecognizer1 = UITapGestureRecognizer(target: self, action: "tapGesture:")
    let gestureRecognizer2 = UITapGestureRecognizer(target: self, action: "tapGesture:")
    let gestureRecognizer3 = UITapGestureRecognizer(target: self, action: "tapGesture:")

    // set the number of taps
    gestureRecognizer1.numberOfTapsRequired = 1
    gestureRecognizer2.numberOfTapsRequired = 2
    gestureRecognizer3.numberOfTapsRequired = 3

    // add the gesture recognizer to the UIImageViews
    gp1.addGestureRecognizer(gestureRecognizer1)
    gp2.addGestureRecognizer(gestureRecognizer2)
    gp3.addGestureRecognizer(gestureRecognizer3)
}

由于这些都是点击手势，我决定使用一种方法和一个switch语句。但是，如果愿意，您可以为每个手势创建不同的方法

func tapGesture(gesture: UITapGestureRecognizer) {
    switch gesture.numberOfTapsRequired {
    case 1:
        gp1.image = UIImage(named: "car")
    case 2:
        gp2.image = UIImage(named: "car")
    case 3:
        gp3.image = UIImage(named: "car")
    default:
        break
    }
}