颜色是这样的，so,status bar和navigation bar颜色是一致的，

虽然用户看来，iOS7默认样式的状态栏和导航栏时连在一起的，但是实际上导航栏的位置和大小是和之前系统版本一样的，依然是贴在状态栏下面，依然是高 44px；之所以用户看来它们是连在一起，这是因为UINavigationBar里面的_UINavigationBarBackground定位在y 方向-20px的位置，然后高度增加到64px，这样就可以同时充当了两者的背景。

而变透明之后就很容易和后面的内容混淆，虽说一般应用不会把内容和状态栏叠合在一起，但是至少，现在的情况是，默认是会叠合的，开发需要从20px像素以下开始布局页面元素才能避免。

 

[navCtrl.navigationBar setBackgroundImage:[UIImage imageNamed:@"nav_background"] forBarMetrics:UIBarMetricsDefault];是一样的，

 

This is the default behavior for UIViewController on iOS 7. The view will be full-screen which means the status bar will cover the top of your view.

 

If you have a UIViewController within a UINavigationController and the navigationBar is visible, you can have the following code in your viewDidLoad or have a background image for navigationBar do the trick.

self.edgesForExtendedLayout =UIRectEdgeNone;

If you have navigationBar hidden, then you have to adjust all the UIView elements by shifting 20 points. I dont't see any other solution. Use auto layout will help a little bit.

Here is the sample code for detecting the iOS version, if you want to backward compatibility.

-(void) viewWillAppear:(BOOL)animated {[super viewWillAppear:animated];if([[[UIDevice currentDevice] systemVersion] floatValue]>=7.0){CGRect screen =[[UIScreen mainScreen] bounds];if(self.navigationController){CGRect frame =self.navigationController.view.frame;
            frame.origin.y =20;
            frame.size.height = screen.size.height -20;self.navigationController.view.frame = frame;}else{if([self respondsToSelector:@selector(containerView)]){UIView*containerView =(UIView*)[self performSelector:@selector(containerView)];CGRect frame = containerView.frame;
                frame.origin.y =20;
                frame.size.height = screen.size.height -20;
                containerView.frame = frame;}else{CGRect frame =self.view.frame;
                frame.origin.y =20;
                frame.size.height = screen.size.height -20;self.view.frame = frame;}}}}

苹果为了让深色浅色背景均能让状态栏内容清晰显示，提供两种状态栏样式：

 

UIStatusBarStyleDefault = 0 黑色文字，浅色背景时使用

UIStatusBarStyleLightContent = 1 白色文字，深色背景时使用

而以下两个旧状态栏样式将被废弃：

UIStatusBarStyleBlackTranslucent = 1

UIStatusBarStyleLightContent = 2

 

还有，iOS7中我们通过ViewController重载方法返回枚举值的方法来控制状态栏的隐藏和样式。

首先，需要在Info.plist配置文件中，增加键：UIViewControllerBasedStatusBarAppearance，并设置为YES；

然后，在UIViewController子类中实现以下两个方法：

1	- (UIStatusBarStyle)preferredStatusBarStyle

2

{

3	return UIStatusBarStyleLightContent;

4

}

5

6	- (BOOL)prefersStatusBarHidden

7

{

8	return NO;

9

}