檢查UserDefaults的值並創建一條IF語句

Question

我試圖讓用戶使用硬幣購買節點，然後在遊戲中使用此節點。

我試圖設置一些代碼，檢查節點是否已被觸摸/購買之前，如果沒有，顯示灰色的節點圖像。

此外，如果用戶的硬幣數量大於一個整數，則在該節點上觸摸啓用允許他們購買它。

這就是我想我可以用它來看看該節點是否已訂購/前感動，如果沒有，給碰的能力/購買，如果他們有足夠的硬幣：

if UserDefaults.standard.bool(forKey: "ship2") == true{ 
     let ship2Texture = SKTexture(imageNamed: "ship2.png") 
     ship2 = SKSpriteNode(texture: ship2Texture) 
     ship2.position = CGPoint(x: self.frame.midX - 150, y: self.frame.midY) 
     self.addChild(ship2) 
    }else{ 
     coinImage1 = SKSpriteNode(texture: coinImageTexture) 
     coinImage1.position = CGPoint(x: self.frame.midX - 150, y: self.frame.midY + 105) 
     coinImage1.zPosition = 1 
     self.addChild(coinImage1) 

     coinLabel1.fontName = "MarkerFelt-Thin" 
     coinLabel1.fontSize = 25 
     coinLabel1.fontColor = .black 
     coinLabel1.text = "20" 
     coinLabel1.position = CGPoint(x: self.frame.midX - 150, y: self.frame.midY + 105) 
     coinLabel1.zPosition = 1.1 
     self.addChild(coinLabel1) 

     let greyship2Texture = SKTexture(imageNamed: "greyship2.png") 
     greyship2 = SKSpriteNode(texture: greyship2Texture) 
     greyship2.position = CGPoint(x: self.frame.midX - 150, y: self.frame.midY) 

     self.addChild(greyship2) 
    } 

現在這裏是我在我的觸動是什麼開始：

if(atPoint(location) == greyship2) { 
     if coinScore > 3 { 
      let oldValue = UserDefaults.standard.integer(forKey: "COINSCORE") 
      let newValue = oldValue - 20 
      UserDefaults.standard.set(newValue, forKey: "COINSCORE") 
      UserDefaults.standard.set(true, forKey: "ship2") 
     } else { 

     } 
    } 
    if(atPoint(location) == ship2){ 
     if let scene = GameScene2(fileNamed: "GameScene2") { 
      // Set the scale mode to scale to fit the window 
      scene.scaleMode = .aspectFill 

      // Present the scene 
      view!.presentScene(scene, transition: SKTransition.doorway(withDuration: 1.2));  
      } 
    } 

唯一的問題是，當用戶有足夠的硬幣和接觸greyship2它不會再檢查的初始代碼。我必須重新啓動coinScore的應用程序，以減少20，並使彩色船舶實際顯示。

我試過把第一部分代碼放在更新函數中，但它崩潰了。

Answer 1

它看起來好像在購買後沒有更新UI。您正在更改UserDefaults值，因此下次運行時將顯示正確的精靈。但是你需要做的是在購買之後更新UI，因爲你的代碼根據你的UserDefaults值選擇了精靈而不是再次運行。如果您的第一個代碼位於某個功能中，那麼您可以在購買完成後調用該功能。

此外，一旦您更改了值以便立即將其寫入磁盤，最好調用UserDefaults.standard.synchronize()。

試試這個

if(greyship2.contains(location)) { 
    if coinScore > 3 { 
     let oldValue = UserDefaults.standard.integer(forKey: "COINSCORE") 
     let newValue = oldValue - 20 

     UserDefaults.standard.set(newValue, forKey: "COINSCORE") 
     UserDefaults.standard.set(true, forKey: "ship2") 
     UserDefaults.standard.synchronize() 

     //Now it has been brought update the UI and other necessary things 

     //If the code is in a function call it 

     //updateUI() 

     //else change the sprites 

     //Remove the grey ship 
     greyship2.setScale(0) 
     greyship2.removeFromParent() 

     //create the new ship and add it to the scene 
     let ship2Texture = SKTexture(imageNamed: "ship2.png") 
     ship2 = SKSpriteNode(texture: ship2Texture) 
     ship2.position = CGPoint(x: self.frame.midX - 150, y: self.frame.midY) 
     ship2.setScale(1) 
     self.addChild(ship2) 
     break //finish the touchesbegan call 
    } 
} 

if(ship2.contains(location)) { 
     if let scene = GameScene2(fileNamed: "GameScene2") { 
      // Set the scale mode to scale to fit the window 
      scene.scaleMode = .aspectFill 

      // Present the scene 
      view!.presentScene(scene, transition: SKTransition.doorway(withDuration: 1.2));  
     } 
} 

希望這有助於