英文:
SCNTransaction repetition
问题
以下是翻译好的代码部分：
以下函数接受一个 SCNNode 参数，并使用 SCNAction 连续重复旋转：
func scnActionFunc(nodeParam: inout SCNNode) {
let angleAmount: CGFloat = 360 * ((.pi) / 180.0)
let action = SCNAction.rotate(by: angleAmount, around: SCNVector3(x: 0, y: 1, z: 0), duration: 32.0)
let repeatAction = SCNAction.repeatForever(action)
nodeParam.runAction(repeatAction)
}
这第二个函数接受一个 SCNNode 参数，并使用 SCNTransaction 执行单个部分旋转：
func scnTransactionFunc(nodeParam: inout SCNNode) {
SCNTransaction.begin()
SCNTransaction.animationTimingFunction = CAMediaTimingFunction(name: CAMediaTimingFunctionName.easeOut)
SCNTransaction.animationDuration = 3.0
nodeParam.transform = SCNMatrix4MakeRotation(-(.pi / 2.0), 1, 0, 0)
SCNTransaction.commit()
}
请注意，我只翻译了代码部分，没有包括问题部分。
英文:
The following function accepts a single SCNNode param and
it uses SCNAction to continuously repeat
a rotation:
func scnActionFunc(nodeParam :inout SCNNode){
let angleAmount : CGFloat = 360 * ((.pi)/180.0)
let action = SCNAction.rotate(by: angleAmount, around: SCNVector3(x: 0, y: 1, z: 0) , duration: 32.0)
let repeatAction = SCNAction.repeatForever(action)
nodeParam.runAction(repeatAction)
}
This second function accepts a single SCNNode param and
it uses SCNTransaction to perform a single partial rotation:
func scnTransactionFunc(nodeParam:inout SCNNode){
SCNTransaction.begin()
SCNTransaction.animationTimingFunction = CAMediaTimingFunction(name: CAMediaTimingFunctionName.easeOut)
SCNTransaction.animationDuration = 3.0
nodeParam.transform = SCNMatrix4MakeRotation( -(.pi / 2.0), 1, 0, 0)
SCNTransaction.commit()
}
My questions:
1: as far as I can see, SCNTransaction does not have its own 'repeat' function - is this the case?
2: Im sure its possible to repeat an SCNTransaction in a function using Timer() or similar class but is there
A canonical method for repeating SCNTransaction code over and over?
Im not trying to find out about repetition itself - there are doubtlessly numerous methods of achieving repeated actions - My reason for posing this question is because Im just trying to make sure I properly understand SCNTransaction as fully as possible. Thanks.
答案1
得分: 0
据我了解，在SCNTransaction中没有内置的重复功能。你可能可以像这样使用：
// 带有完成处理程序的场景事务示例
SCNTransaction.begin()
SCNTransaction.animationDuration = 6.0
// 为完成处理启用 completionBlock
SCNTransaction.completionBlock = {
SCNTransaction.begin()
SCNTransaction.animationDuration = 1.0
explosion.particleColor = UIColor.blue
SCNTransaction.commit()
}
cameraNode.camera?.focalLength = 50
SCNTransaction.commit()
通过调用函数本身来替换completionBlock中的内容：
func scnTransactionFunc(nodeParam:inout SCNNode) {
SCNTransaction.begin()
SCNTransaction.animationTimingFunction = CAMediaTimingFunction(name: CAMediaTimingFunctionName.easeOut)
SCNTransaction.animationDuration = 3.0
SCNTransaction.completionBlock = {
scnTransactionFunc(nodeParam:inout SCNNode)
}
nodeParam.transform = SCNMatrix4MakeRotation( -(.pi / 2.0), 1, 0, 0)
SCNTransaction.commit()
}
**注意：直到退出应用程序，此函数将永远不会终止。**
也许最好使用你使用SCNAction的示例。这个可以随时终止。使用计划定时器也可能有效。
希望我能在某种程度上帮到你。
<details>
<summary>英文:</summary>
As far as I know, there is no built-in repeat functionality within SCNTransaction. You could use probably something like this:
// Scene Transaction with completion handler example
SCNTransaction.begin()
SCNTransaction.animationDuration = 6.0
// For completion handling - enable the completionBlock
SCNTransaction.completionBlock = {
SCNTransaction.begin()
SCNTransaction.animationDuration = 1.0
explosion.particleColor = UIColor.blue
SCNTransaction.commit()
}
cameraNode.camera?.focalLength = 50
SCNTransaction.commit()
replace the content of the completionBlock by calling the function itself again.
func scnTransactionFunc(nodeParam:inout SCNNode) {
SCNTransaction.begin()
SCNTransaction.animationTimingFunction = CAMediaTimingFunction(name: CAMediaTimingFunctionName.easeOut)
SCNTransaction.animationDuration = 3.0
SCNTransaction.completionBlock = {
scnTransactionFunc(nodeParam:inout SCNNode)
}
nodeParam.transform = SCNMatrix4MakeRotation( -(.pi / 2.0), 1, 0, 0)
SCNTransaction.commit()
}
**Note: this function will never terminate until you exit the application.**
It might be better to use the example in which you use the SCNAction. This one you can terminate at any time. Using a Scheduled Timer might work as well.
Hope I could help you in some way.
</details>
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