我正在进行iOs游戏,但我遇到了问题。 我需要显示x精灵(每个我都有一个刻度SKAction)。 我需要等到所有SKAction精灵再做其他事情。 每个SKAction都在一个单独的线程中运行。 我怎么等?
这是一段代码:
for tile in tiles {
let randomNum:UInt32 = arc4random_uniform(20) // range is 0 to 99
let randomTime:TimeInterval = TimeInterval(randomNum/10)
let scale = SKAction.scale(by: 1, duration: 2, delay:randomTime , usingSpringWithDamping: 0.1, initialSpringVelocity: 5)
tile.sprite = SKSpriteNode(imageNamed: tile.type.spriteName)
tile.sprite?.size = CGSize(width: TileWidth, height: TileHeight)
tile.sprite?.position = tile.position!
tile.sprite?.scale(to: CGSize(width: 0, height: 0))
cookiesLayer.addChild(tile.sprite!)
tile.sprite?.run(scale)
}
//TODO code to add to be executed after all SKActions
如何在所有SKActions之后将我的TODO代码作为执行者? 我想并行或一个接一个地运行SKAction。
感谢。
答案 0 :(得分:4)
您可以使用run方法使用完成块轻松完成此操作。
只是为了这个例子,假设你有一个名为someSpriteNode的SKSpriteNode
,并想知道两个动作(在这种情况下是applyImpulse)何时完成运行:
// 1) Create your actions:
let action1 = SKAction.applyImpulse(CGVector(dx: 1.0, dy: 0.0), duration: 2.0)
let action2 = SKAction.applyImpulse(CGVector(dx: 6.0, dy: 2.0), duration: 1.0)
// 2) Add them to a sequence:
let actionSequence = SKAction.sequence([action1, action2])
// 3) Run the sequence using a completion block:
someSpriteNode?.run(actionSequence, completion: {
// All your actions are now finished
// Do whatever you want here :)
})
更新:在执行一组操作时获得通知,其中所有操作都在同一节点上运行
您可能正在寻找行动小组:
// Declare an empty array that will store all your actions:
var actions = [SKAction]()
// Iterate through your nodes:
for _ in 0..<6 {
// ...
// Generate your random scale, delay, or whatever you need:
let randomScale = CGFloat(GKRandomDistribution(lowestValue: 0, highestValue: 10).nextInt())
// Create your custom action
let scaleAction = SKAction.scale(by: randomScale, duration: 2.0)
// Append your action to the actions array:
actions.append(scaleAction)
}
// Create an action group using the actions array:
let actionGroup = SKAction.group(actions)
// Run your action group, and do whatever you need inside the completion block:
self.run(actionGroup, completion: {
// All your actions are now finished, no matter what node they were ran on.
})
此外,我建议您使用GameplayKit
在游戏中生成随机数字,这肯定会让您的生活更轻松:)
更新2:在所有操作都执行后获得通知,如果所有操作都在不同节点上运行
使用DispatchGroup
:
// Create a DispatchGroup:
let dispatchGroup = DispatchGroup()
for _ in 0..<6 {
// ...
let randomWait = Double(GKRandomDistribution(lowestValue: 1, highestValue: 12).nextInt())
let waitAction = SKAction.wait(forDuration: randomWait)
let fadeOutAction = SKAction.fadeOut(withDuration: 2.0)
let fadeInAction = SKAction.fadeIn(withDuration: 2.0)
let sequenceAction = SKAction.sequence([waitAction, fadeOutAction, fadeInAction])
// Enter the DispatchGroup
dispatchGroup.enter()
colorSquares[i].run(sequenceAction, completion: {
// Leave the DispatchGroup
dispatchGroup.leave()
})
}
// Get notified when all your actions left the DispatchGroup:
dispatchGroup.notify(queue: DispatchQueue.main, execute: {
// When this block is executed, all your actions are now finished
})
我认为这种解决方案比计数器更优雅:)
答案 1 :(得分:1)
首先,您应该始终创建Minimum Verifiable Example。从您的问题中删除不需要的东西,并确保包含测试代码所需的一切。
我假设您有一个与此类似的Tile
类
class Tile {
var sprite: SKSpriteNode?
}
和这样的数组
let tiles:[Tile] = ...
// 0. create a maxDuration variable
var maxDuration:TimeInterval = 0
// 1. create all the actions
let actions = tiles.map { tile in
return SKAction.run {
let randomNum = arc4random_uniform(100)
let randomTime = TimeInterval(randomNum / 10)
let wait = SKAction.wait(forDuration: randomTime)
let scale = SKAction.scale(by: 1, duration: 2)
tile.sprite?.run(scale)
maxDuration = max(maxDuration, randomTime + 2)
}
}
// 2. create a wait action for the max duration
let wait = SKAction.wait(forDuration: maxDuration)
// 3. write inside this action the code to be executed after all the actions
let completion = SKAction.run {
print("now all the actions are completed")
}
// 4. create a sequence of wait + completion
let sequence = SKAction.sequence([wait, completion])
// 5. create a group to run in parallel actions + sequence
let group = SKAction.group(actions + [sequence])
// 6. run the group on the node you prefer (it doesn't really matter which node since every inner action is tied to a specific node)
self.run(group)
var maxDuration:TimeInterval = 0
tiles.forEach { tile in
let randomNum = arc4random_uniform(100)
let randomTime = TimeInterval(randomNum / 10)
let wait = SKAction.wait(forDuration: randomTime)
let scale = SKAction.scale(by: 1, duration: 2)
tile.sprite?.run(scale)
maxDuration = max(maxDuration, randomTime + 2)
}
run(.wait(forDuration: maxDuration)) {
print("now all the actions are completed")
}