Ios 导航栏覆盖了顶部视图的某些部分

当我通过

didselectrowatinex

方法实例化视图控制器时：

let vc = self.storyboard?.instantiateViewControllerWithIdentifier("About") as About
self.navigationController?.pushViewController(vc, animated: true)
break;

About

视图控制器的一部分位于导航栏下方。如何在Swift中解决此问题

---

尝试将扩展布局的边缘设置为“无”

Swift 2

self.edgesForExtendedLayout = UIRectEdge.None

Swift 3+

self.edgesForExtendedLayout = []

self.edgesForExtendedLayout = .all

Swift 4+

self.edgesForExtendedLayout = []

self.edgesForExtendedLayout = .all

可能重复的