SKEase动作，如何使用浮动改变动作设置块？ [英] SKEase action, how to use Float changing Action Setter Block?

问题描述

在下面的用例中，我试图为 SKShapeNode 的 lineWidth 设置动画。

SKEase是精彩的

解决方案

如果你键入 let fn = SKEase.getEaseFunction（

这里有一些代码：

  let fn = SKEase.getEaseFunction（.curveTypeQuadratic，easeType：.easeTypeInOut）
 let easeFat = SKEase.createFloatTween 2.5，结束：30.0，时间：easeTime / 2，easingFunction：fn）{（node：SKNode，param：CGFloat）in 
 let spinny = node as！SKShapeNode 
 spinny.lineWidth = param 
 
 let easeThin = SKEase.createFloatTween（30.0，end：2.5，time：easeTime / 2，easingFunction：fn）{（node：SKNode，param：CGFloat）in 
 let spinny = node as！ SKShapeNode 
 spinny.lineWidth = param 
} 
 
如果let spinnyNode = self.spinnyNode {
 spinnyNode.lineWidth = 2.5 
 
 let rotate = SKAction.rotate（byAngle：CGFloat（M_PI）* CGFloat（2.0），duration：easeTime）
 let easeFatThin = SKAction.sequence（[easeFat，easeThin]）
 let rotateAndEase = SKAction.group rotate，easeFatThin]）
 
 spinnyNode.run（SKAction.repeatForever（rotateAndEase））
 spinnyNode.run（SKAction.sequence（[SKAction.wait（forDuration：easeTime），
 SKAction.fadeOut（withDuration：easeTime），
 SKAction.removeFromParent（）]））
} 
  

我的 GitHub 上有一个完整的项目。

In the following use case, I'm trying to animate the lineWidth of an SKShapeNode.

SKEase is part of the wonderful SpriteKitEasing github repo from Craig Grummitt.

One of its facilities is a Float changing ease action that appears to change the value of a float over time.

However I can't figure out how to use it. Xcode gives the following suggestions when typing it in:

 let lineWeight = SKEase.createFloatTween(<start: CGFloat, end: CGFloat, time: TimeInterval, easingFunction: AHEasingFunction, setterBlock: ((SKNode, CGFloat) -> Void))

With other SKEase actions from this library, Xcode is very helpful with ease types, and helping to figure out what to enter.

With this one, I have no idea what options are available for AHEasingFunctions... which I can probably find.

But I have absolutely no idea what or how to use the final part, the setterBlock seemingly expecting a function taking a pair of parameters unrelated to the activity. XCode won't accept SKShapeNodes or SKSpriteNodes here, only an SKNode, but I can't get beyond that.

---

Here's how the docs for SKEase describe it:

解决方案

If you type let fn = SKEase.getEaseFunction( and then a dot for the enum types for curve-type and ease-type you'll get completion.

With the SKNode to SKShapeNode you'll have to cast.

Here's some code:

    let fn = SKEase.getEaseFunction(.curveTypeQuadratic, easeType: .easeTypeInOut)
    let easeFat = SKEase.createFloatTween(2.5, end: 30.0, time: easeTime/2, easingFunction: fn) { (node: SKNode, param: CGFloat) in
        let spinny = node as! SKShapeNode
        spinny.lineWidth = param
    }
    let easeThin = SKEase.createFloatTween(30.0, end: 2.5, time: easeTime/2, easingFunction: fn) { (node: SKNode, param: CGFloat) in
        let spinny = node as! SKShapeNode
        spinny.lineWidth = param
    }

    if let spinnyNode = self.spinnyNode {
        spinnyNode.lineWidth = 2.5

        let rotate = SKAction.rotate(byAngle: CGFloat(M_PI) * CGFloat(2.0), duration: easeTime)
        let easeFatThin = SKAction.sequence([easeFat, easeThin])
        let rotateAndEase = SKAction.group([rotate, easeFatThin])

        spinnyNode.run(SKAction.repeatForever(rotateAndEase))
        spinnyNode.run(SKAction.sequence([SKAction.wait(forDuration: easeTime),
                                          SKAction.fadeOut(withDuration: easeTime),
                                          SKAction.removeFromParent()]))
    }

And a complete project on my GitHub.

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