Question

我在解除多重连接窗口后收到此错误：

"Warning: Attempt to present < AudioWaves.ViewControllerJoin: 0x176cf2d0> on < AudioWaves.ViewController: 0x17594de0>  whose view is not in the window hierarchy!"

以下是我的代码，

func browserViewControllerDidFinish(
    browserViewController: MCBrowserViewController!)  {
        // Called when the browser view controller is dismissed (ie the Done
        // button was tapped)
        let ViewControllerjoin:ViewControllerJoin = ViewControllerJoin()

        self.presentViewController(ViewControllerjoin, animated: true, completion: nil)
        dismissViewControllerAnimated(true, completion: nil)

}

如果我在新视图控制器出现之前放弃了解雇，浏览器就会解散，但应用程序只会显示一个空白的黑屏而没有错误。

Answer 1

将这两个电话连接起来：

dismissViewControllerAnimated(true, completion: {
    self.presentViewController(ViewControllerjoin, animated: true, completion: nil)
})

这种方式首先链接dismissViewControllerAnimated然后链接presentViewController，这可以防止您的层次结构出现奇怪的行为

这有助于提问者验证他的ViewController确实是黑屏：尝试将ViewControllerJoin的背景颜色更改为蓝色，例如再次尝试，一旦我看到默认的backgroundColor导致了ViewController中的黑屏（这似乎有助于

查看控制器转换错误

1 个答案: