在你的app plist文件中添加一行，命名为“View controller-based status bar appearance”，并将其设置为NO。

你可以通过在iOS7 SDK中实现一个名为edgesForExtendedLayout的新属性来实现这一点。请添加以下代码来实现此功能，

if ([self respondsToSelector:@selector(edgesForExtendedLayout)])
        self.edgesForExtendedLayout = UIRectEdgeNone;

你需要在你的-(void)viewDidLoad方法中添加上面的内容。

iOS 7 brings several changes to how you layout and customize the appearance of your UI. The changes in view-controller layout, tint color, and font affect all the UIKit objects in your app. In addition, enhancements to gesture recognizer APIs give you finer grained control over gesture interactions. Using View Controllers In iOS 7, view controllers use full-screen layout. At the same time, iOS 7 gives you more granular control over the way a view controller lays out its views. In particular, the concept of full-screen layout has been refined to let a view controller specify the layout of each edge of its view. The wantsFullScreenLayout view controller property is deprecated in iOS 7. If you currently specify wantsFullScreenLayout = NO, the view controller may display its content at an unexpected screen location when it runs in iOS 7. To adjust how a view controller lays out its views, UIViewController provides the following properties: edgesForExtendedLayout The edgesForExtendedLayout property uses the UIRectEdge type, which specifies each of a rectangle’s four edges, in addition to specifying none and all. Use edgesForExtendedLayout to specify which edges of a view should be extended, regardless of bar translucency. By default, the value of this property is UIRectEdgeAll. extendedLayoutIncludesOpaqueBars If your design uses opaque bars, refine edgesForExtendedLayout by also setting the extendedLayoutIncludesOpaqueBars property to NO. (The default value of extendedLayoutIncludesOpaqueBars is NO.) automaticallyAdjustsScrollViewInsets If you don’t want a scroll view’s content insets to be automatically adjusted, set automaticallyAdjustsScrollViewInsets to NO. (The default value of automaticallyAdjustsScrollViewInsets is YES.) topLayoutGuide, bottomLayoutGuide The topLayoutGuide and bottomLayoutGuide properties indicate the location of the top or bottom bar edges in a view controller’s view. If bars should overlap the top or bottom of a view, you can use Interface Builder to position the view relative to the bar by creating constraints to the bottom of topLayoutGuide or to the top of bottomLayoutGuide. (If no bars should overlap the view, the bottom of topLayoutGuide is the same as the top of the view and the top of bottomLayoutGuide is the same as the bottom of the view.) Both properties are lazily created when requested.

请参考，苹果医生

对我来说，最简单的解决方案是在plist中添加两个键

在我的例子中，loadView()被中断 这段代码: 自我。edgesForExtendedLayout = UIRectEdgeNone

但删除loadView()后一切工作正常

Swift 4.2 - Xcode 10.0 - iOS 12.0:

if #available(iOS 11.0, *) {} else {
  self.edgesForExtendedLayout = []
  self.navigationController?.view.backgroundColor = .white
}

Swift 3 / Swift 4解决方案，也适用于iOS 10+中的nib /XIB文件:

override func viewDidLoad() {
    super.viewDidLoad()

    edgesForExtendedLayout = []
}