'SKNode？'沒有一個名字爲'position'的會員

Question

我做錯了什麼？我似乎無法弄清楚這一點。我曾嘗試把一個感嘆號後面的標記：var thisBlock = self.childNodeWithName(block),

這給了我一個新的錯誤說。 type() does not confirm to protocol 'BooleanType'.

func blockRunner() { 
     for(block, blockStatus) in self.blockStatuses { 
      var thisBlock = self.childNodeWithName(block) 
      if blockStatus.shouldRunBlock() { 
       blockStatus.timeGapForNextRun = random() 
       blockStatus.currentInterval = 0 
       blockStatus.isRunning = true 
      } 

      if blockStatus.isRunning { 
       if thisBlock.position.x = blockMaxX{ 
        thisBlock.position.x -= CGFloat(self.groundSpeed) 
       } else { 
        thisBlock.position.x = self.origBlockPositionX 
        blockStatus.isRunning = false 
        self.score++ 
        if ((self.score % 5) == 0) { 
         self.groundSpeed++ 
        } 
        self.scoreText.text = String(self.score) 
       } 
      } else { 
       blockStatus.currentInterval++ 
      } 
     } 
    } 

Answer 1

childNodeWithName()不會返回，你必須拆開包裝使用的可選SKNode?。我不知道爲什麼var thisBlock = self.childNodeWithName(block)!沒有解決您的問題。我會建議使用可選結合（if let）語法：

if let thisBlock = self.childNodeWithName(block) { 
    if blockStatus.shouldRunBlock() { 
     blockStatus.timeGapForNextRun = random() 
     blockStatus.currentInterval = 0 
     blockStatus.isRunning = true 
    } 

    if blockStatus.isRunning { 
     ... rest of your code 
} 

這還沒有崩潰的額外的好處，如果沒有子節點。它只是不會進入該塊。