Warning: Attempt to present ControllerA and ControllerB whose view is not in the window hierarchy!
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今天在写UIAlertController的时候，在ViewDidLoad中声明并模态推出的时候出现了一个错误：
Warning: Attempt to present <UIAlertController: 0x7f8691f12f80> on <ViewController: 0x7f8691c38d20> which is already presenting <UIAlertController: 0x7f8691e93930>
这个错误网上查了一下，原因是在presnet的时候viewDidLoad还没有执行完成，只有viewDidLoad执行完成之后，正常使用。
在控制器加载的时候，不能使用这个去调用，这样就必须向办法延时才行。
由于是Demo，习惯性的直接写在viewDidLoad中，我最后使用一个Button来出发这个动作，就没有以上错误了。
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