swift - 在加载大场景之前取消隐藏图像

Question

我试图在呈现需要几秒钟加载的场景之前取消隐藏图像。如果我删除presentScene，loadscreenman 图像将正确显示。不知道为什么当presentScene存在时loadscreenman没有出现。在场景加载时显示该图像将是纯粹的奢侈。

if (node.name == “btnGameOnMan") {
    loadscreenman.hidden = false
    callgammescenefun()
}

func callgammescenefun()
{
    loadscreenman.hidden = false
    let reveal = SKTransition.doorsCloseHorizontalWithDuration(0.2)
    let gameScene = GameScene(size: self.size)
    self.view!.presentScene(gameScene, transition: reveal)
}

Answer 1

如果 node.name == “btnGameOnMan”，您可以像这样触发 NSNotification:

if (node.name == “btnGameOnMan") {

     dispatch_async(dispatch_get_main_queue(), {
    loadscreenman.hidden = false
    NSNotificationCenter.defaultCenter().postNotificationName("NotificationFired", object: nil)
     })
}

然后在您的 callgammescenefun() 中接收触发的通知，如下所示:

func callgammescenefun(notification: NSNotification){
 NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(self.callgammescenefun(_:)), name: "NotificationFired", object: nil)
.
.   //your code
.

}

在此之后，将其写在函数之外:

deinit{
        NSNotificationCenter.defaultCenter().removeObserver(self)
    }