SceneKit Swift3 编译器错误

Question

我正在尝试运行在 SceneKit 中制作动画 "DAE" 模型：

let url = Bundle.main.url(forResource: "art.scnassets/Player(walking)", withExtension: "dae")
    let sceneSource = SCNSceneSource(url: url!, options: [SCNSceneSource.LoadingOption.animationImportPolicy: SCNSceneSource.AnimationImportPolicy.playRepeatedly] )
    let animationIds: NSArray = sceneSource?.identifiersOfEntries(withClass: CAAnimation)

    for eachId in animationIds {
        let animation: CAAnimation = (sceneSource?.entryWithIdentifier(eachId as! String, withClass: CAAnimation.self))!
        animations.add(animation)
    }
    character?._walkAnimations = animations

但是编译器抛出就行了：

let animationIds: NSArray = sceneSource?.identifiersOfEntries(withClass: CAAnimation)

并写入错误：

无法转换“[String]”类型的值？指定类型 'NSArray'

请帮我解决这个问题。

提前致谢。

Answer 1

为什么要将 [String]? 转换为 NSArray，然后再次将每个元素转换为 String，不需要它，只需使用 Swift native Array并用 if let 或 guard let.

包装可选值

guard let animationIds = sceneSource?.identifiersOfEntries(withClass: CAAnimation) else {
    return
}
for eachId in animationIds {
    if let animation = sceneSource?.entryWithIdentifier(eachId, withClass: CAAnimation.self) {
        animations.add(animation)
    }
}
character?._walkAnimations = animations

SceneKit Swift3 编译器错误

SceneKit Swift3 compiler-error

3d

animation

compiler-errors

scenekit

swift3