爲每一個元素迭代時添加一個延遲

Question

嘗試使用SKLabelNode在標籤上逐個顯示下面數組中的元素。我認爲問題在於它比數組更快地遍歷數組，因此導致崩潰，因爲self.addChild()嘗試再次顯示「Set」，而「Ready」仍在顯示。

我的問題是，我如何減慢這個迭代，以便在「Set」顯示之前「Ready」可以出現和消失？

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

它之所以被立即會去是因爲你不鏈條一切行動以相同的順序，那麼你所有的階段都在同一時間運行：

試試這個，我現在不是編譯器：

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)