arrays - 在遍历数组时为每个元素添加延迟

Question

尝试使用 SKLabelNode 在标签上逐一显示下面数组中的元素。我认为问题是它迭代数组的速度比序列运行它的过程要快，因此导致崩溃，因为 self.addChild() 试图再次显示“Set”，而还在显示“Ready”。

我的问题是，如何减慢此迭代，以便在显示“已设置”之前“就绪”可以出现和消失？

let readySetGo = ["Ready", "Set", "GO!"]
for i in readySetGo {
    newLevelLabel.text = i
    newLevelLabel.fontSize = 60

    let wait = SKAction.wait(forDuration: 2)
    let remove = SKAction.removeFromParent()
    let sequence = SKAction.sequence([wait, remove])

    newLevelLabel.run(sequence)

    self.addChild(newLevelLabel)
}

Answer 1

它立即进入 GO 的原因是因为您没有按相同顺序链接所有操作，所以您的所有阶段都在同时运行:

试试这个，我现在还没有编译器:

let readySetGo = ["Ready", "Set", "GO!"]

newLevelLabel.fontSize = 60

let seq: [SKAction]=[]
let waitTime:TimeIneterval = 2

for i in readySetGo {

    let block = SKAction.run{
        self.newLevelLabel.text = i
    }

    let wait = SKAction.wait(forDuration: waitTime)

    seq.append(wait)
    seq.append(block)

}

let wait = SKAction.wait(forDuration: waitTime)
let remove = SKAction.removeFromParent()
seq.append(wait)
seq.append(remove)
let sequence = SKAction.sequence(seq)

newLevelLabel.run(sequence)

self.addChild(newLevelLabel)