Question

我第一次在iOS应用程序中使用SpriteKit动画。我的目标是拖放标签，图像和文本字段。我使用SKLabelNode和SKSpriteNode为标签和图片完成了这项工作。

全球我宣布，

var deltaPoint = CGPointZero
var selectedNode = SKNode()

首先我用didMoveToView方法创建了标签，图片，文本字段。然后将标签和图像添加为子节点，将textfield添加为子视图，如下面提到的代码。

   let textField = UITextField(frame: CGRectMake(self.size.width / 2, self.size.height / 2 + 20, 200, 40))
    textField.center = view.center
    textField.borderStyle = .RoundedRect
    textField.tag = 101
    textField.textColor = UIColor.blackColor()
    textField.font = UIFont.systemFontOfSize(17.0)
    textField.placeholder = "Enter your name here"
    textField.backgroundColor = UIColor.whiteColor()
    textField.autocorrectionType = .Yes
    textField.keyboardType = .Default
    textField.clearButtonMode = .WhileEditing
    textField.enabled = true
    view.addSubview(textField)

    let imageNode = SKSpriteNode(imageNamed: "images.jpg")
    imageNode.name = kMovableImageNodeName
    imageNode.position = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMidY(self.frame))
    self.addChild(imageNode)

    let labelNode = SKLabelNode(fontNamed: "Helvetica")
    labelNode.name = kMovableLabelNodeName
    labelNode.text = "Welcome"
    labelNode.fontSize = 30
    labelNode.position = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMidY(self.frame))
    self.addChild(labelNode)

在TouchesBegan方法中，将触摸节点设置为所选节点。

override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
        labelNode.zPosition = 0
        imageNode.zPosition = 0
        let positionInScene = touches.first?.locationInNode(self)
        let touchedNode = self.nodeAtPoint(positionInScene!)
        selectedNode = touchedNode
        selectedNode.zPosition = 1
    }

在TouchesMoved方法中，设置增量点值

override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) {
        let currentPoint = touches.first?.locationInNode(self)
        let previousPoint :CGPoint = (touches.first?.previousLocationInNode(self))!
        deltaPoint = CGPointMake(currentPoint!.x - previousPoint.x, currentPoint!.y - previousPoint.y)
    }

    override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {
        selectedNode.zPosition = 1
        deltaPoint = CGPointZero
    }

    override func touchesCancelled(touches: Set<UITouch>?, withEvent event: UIEvent?) {
        selectedNode.zPosition = 0
        deltaPoint = CGPointZero
    }

在更新方法中，将新点设置为所选节点

override func update(currentTime: CFTimeInterval) {

    let newPoint = CGPointMake(selectedNode.position.x + self.deltaPoint.x, self.selectedNode.position.y + self.deltaPoint.y)
    selectedNode.position = newPoint
    deltaPoint = CGPointZero
}

像这样如何拖放文本字段，当用户双击文本字段时，必须显示键盘。

如何在iOS中使用SpriteKit拖放UITextField？

0 个答案: