presentViewController显示方式的窗口，没有导航栏的解决方法

ViewController *Controller = [[ViewController alloc] init];[self presentViewController:Controller animated:YES completion:nil];

怎么看怎么觉得代码没啥问题，搜索了半天发现应该采用如下方式，对Controller进行转换

ViewController *Controller = [[ViewController alloc] init];UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:Controller];[self presentViewController:nav animated:YES completion:nil];

这样就OK啦