addChild(background)
    addChild(rate)
    addChild(scoreLabel)
    addChild(share)
    addChild(playAgain)
    addChild(highscoreLabel)
    addChild(scoreBackground)
    addChild(highscoreBackground)

以下是截取屏幕截图的方法：

UIGraphicsBeginImageContext(self.view!.bounds.size)
    self.view!.layer.renderInContext(UIGraphicsGetCurrentContext())
    let screenshot = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    UIImageWriteToSavedPhotosAlbum(screenshot,nil,nil)

任何的意见都将会有帮助