reason: 'Pushing a navigation controller is not supported'报上面的错误，原因是：大家知道，可以将ViewController push到一个 NavigationController中。就像是入栈操作！将一个NavigationController再次push到NavigationController中时，报错，出現了reason: 'Pushing a navigation controller is not supported'的错误。应该是，NavigationController不支持push进來 Read More
