隐藏状态栏的步骤:

1.转到您的应用程序信息。plist文件。

2.和设置，查看基于控制器的状态栏外观:布尔NO

希望我解决了状态栏问题.....

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。

你不需要计算要往下平移多远，这有一个内置属性。在Interface Builder中，突出显示视图控制器，然后导航到属性检查器。在这里你会看到一些复选框旁边的文字“扩展边缘”。正如你所看到的，在第一个截图中，默认的选择是让内容出现在顶部和底部的栏下，而不是在不透明的栏下，这就是为什么将栏样式设置为不半透明的原因。

正如你在第一张截图中看到的，有两个UI元素隐藏在导航栏下面。这些元素，一个UIButton和一个UISegmentedControl都有他们的“y”原点设为零，视图控制器被设置为允许内容低于顶部栏。

这第二张截图显示了当你取消选择“顶部栏下”复选框时会发生什么。正如你所看到的，视图控制器视图已经适当地向下移动，因为它的y原点在导航栏的正下方。

这也可以通过使用-[UIViewController edgesForExtendedLayout]来实现。这里有一个edgeForExtendedLayout和UIRectEdge类引用的链接

[self setEdgesForExtendedLayout:UIRectEdgeNone];

我在ipad (armv7, armv7s, amr64)上的应用程序也有同样的问题，只是通过呈现另一个UIViewController，并在驳回它们后，在状态栏下进入导航栏… 我花了很多时间来寻找解决方案。我使用故事板和在InterfaceBuilder的UIViewController，这使得糟糕的我设置从全屏->当前上下文的演示，它修复了这个问题。它在我的应用程序只适用于ipad => iOS8.0(测试与iOS8.1)和ipad与iOS 7.1不工作!!

从下拉列表中添加“基于视图控制器的状态栏外观”作为info.plist中的一行。就像这样:

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