线程1：信号SIGABRT：使用NSException类型的未捕获异常终止

Question

当我点击重启我创建的游戏时，我发现了这个错误。它在与GameScene不同的单独SKScene中调用，并用touchesBegan（）编写。我的代码中是否缺少某些内容？

这是：

import SpriteKit
class GameOver: SKScene {
  override init(size: CGSize) {
    super.init(size: size)
    ...
  }
  override func touchesBegan() {
    let reveal = SKTransition.fadeWithDuration(0.5)
    let gameScene = GameScene(size: self.size)
    self.view!.presentScene(gameScene, transition: reveal)
  }
}





 _TFC13Penguin_Peril8GameOver12touchesBeganfS0_FTGVSs3SetCSo7UITouch_9withEventGSqCSo7UIEvent__T_ + 397
10  Penguin Peril                       0x0000000108a30cf2 _TToFC13Penguin_Peril8GameOver12touchesBeganfS0_FTGVSs3SetCSo7UITouch_9withEventGSqCSo7UIEvent__T_ + 98
11  SpriteKit                           0x000000010a835c4a -[SKView touchesBegan:withEvent:] + 941
12  UIKit                               0x000000010aa52894 -[UIWindow _sendTouchesForEvent:] + 308
13  UIKit                               0x000000010aa53691 -[UIWindow sendEvent:] + 865
14  UIKit                               0x000000010aa05752 -[UIApplication sendEvent:] + 263
15  UIKit                               0x000000010a9e0fcc _UIApplicationHandleEventQueue + 6693
16  CoreFoundation                      0x000000010a0380a1 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
17  CoreFoundation                      0x000000010a02dfcc __CFRunLoopDoSources0 + 556
18  CoreFoundation                      0x000000010a02d483 __CFRunLoopRun + 867
19  CoreFoundation                      0x000000010a02ce98 CFRunLoopRunSpecific + 488
20  GraphicsServices                    0x000000010e98dad2 GSEventRunModal + 161
21  UIKit                               0x000000010a9e6676 UIApplicationMain + 171
22  Penguin Peril                       0x0000000108a49afd main + 109
23  libdyld.dylib                       0x000000010cac092d start + 1

）        libc ++ abi.dylib：以NSException类型的未捕获异常终止 （lldb）