对于Archy Holt的回答，有一个小的选择，更简单一点:

a.在info.plist中设置“UIViewControllerBasedStatusBarAppearance”为“NO”

b.在AppDelegate的应用程序didFinishLaunchingWithOptions:中调用:

if ([[UIDevice currentDevice].systemVersion floatValue] < 7)
{
    self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
}
else
{
    // handling statusBar (iOS7)
    application.statusBarStyle = UIStatusBarStyleLightContent;
    self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].applicationFrame];
    self.window.clipsToBounds = YES;

    // handling screen rotations for statusBar (iOS7)
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(applicationDidChangeStatusBarOrientationNotification:) name:UIApplicationDidChangeStatusBarOrientationNotification object:nil];
}

并添加方法:

- (void)applicationDidChangeStatusBarOrientationNotification:(NSNotification *)notification
{
    // handling statusBar (iOS7)
    self.window.frame = [UIScreen mainScreen].applicationFrame;
}

你也可以考虑子类化UIWindow来处理UIApplicationDidChangeStatusBarOrientationNotification本身。

Interface Builder中有一个选项，调用iOS 6/7 Delta属性，旨在解决偏移问题。

在Stack Overflow的问题界面构建器:什么是UIView的布局iOS 6/7 delta ?

我的解决方案是在iOS 7上，在窗口顶部添加一个高度为20点的UIView。 然后我在AppDelegate类中创建了一个方法来显示/隐藏“固态”状态栏背景。在应用程序:didFinishLaunchingWithOptions::

// ...

// Add a status bar background
self.statusBarBackground = [[UIView alloc] initWithFrame:CGRectMake(0, 0, self.window.bounds.size.width, 20.0f)];
self.statusBarBackground.backgroundColor = [UIColor blackColor];
self.statusBarBackground.alpha = 0.0;
self.statusBarBackground.userInteractionEnabled = NO;
self.statusBarBackground.layer.zPosition = 999; // Position its layer over all other views
[self.window addSubview:self.statusBarBackground];

// ...
return YES;

然后我创建了一个方法来淡入/淡出黑色状态栏背景:

- (void) showSolidStatusBar:(BOOL) solidStatusBar
{
    [UIView animateWithDuration:0.3f animations:^{
        if(solidStatusBar)
        {
            [[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent];
            self.statusBarBackground.alpha = 1.0f;
        }
        else
        {
            [[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleDefault];
            self.statusBarBackground.alpha = 0.0f;
        }
    }];
}

我现在要做的就是在需要时调用[appDelegate showSolidStatusBar:YES]。

如果你正在使用接口构建器，试试这个:

在你的xib文件中:

1)选择主视图，设置背景颜色为黑色(或任何你想要状态栏的颜色)

2) Make sure the background is a self contained subview positioned as a top level child of the controller's view. Move your background to become a direct child of the controller's view. Check the autosizing panel to be sure that you've locked all frame edges, activated both flexibility axes, and if this is a UIImageView, set the content mode to Scale to fill. Programmatically this translates to contentMode set to UIViewContentModeScaleToFill and has its auto resizing mask set to (UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight).

3)现在将所有被锁定的东西上下移动20点，并设置iOS 6/7 delta Y为-20。 在自动缩放面板中，所有被锁定在顶部框架上的顶级子图层都需要向下移动20点，并将其iOS 6/7 delta Y设置为-20。(Cmd选择所有这些，并按下箭头20次-有更好的方法吗?)

4) Adjust the iOS 6/7 delta height of all of the above items that had a flexible height. Any of the items that were locked to the frame top and bottom and had flexible height enabled in the autosizing panel must also have their iOS 6/7 delta height set to 20. That includes the background view mentioned above. This may seem anti-intuitive, but due to the order in which these are applied, it is necessary. The frame height is set first (based on device), then the deltas are applied, and finally the autosizing masks are applied based upon the offset positions of all of the child frames - think it through for a bit, it will make sense.

5)最后，被锁定在底部框架而不是顶部框架的项目根本不需要delta。

这将给你在iOS7和iOS6中相同的状态栏。

另一方面，如果你想要iOS7样式同时保持iOS6兼容性，那么将背景视图的delta Y / delta height值设置为0。

要查看更多iOS7迁移信息，请阅读全文:http://uncompiled.blogspot.com/2013/09/legacy-compatible-offsets-in-ios7.html

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.....

为了继续使用setStatusBarHidden:我使用这个类别:

@interface UIApplication (StatusBar)

-(void)setIOS7StatusBarHidden:(BOOL)statusBarHidden;

@end

@implementation UIApplication (StatusBar)

-(void)setIOS7StatusBarHidden:(BOOL)statusBarHidden{
    if (!IOS7) {
        [self setStatusBarHidden:statusBarHidden];
        return;
     }

    if ([self isStatusBarHidden] == statusBarHidden) {
        return;
    }

    [self setStatusBarHidden:statusBarHidden];
    [self keyWindow].clipsToBounds = YES;
    CGFloat offset = statusBarHidden ? 0 : 20;
    [self keyWindow].frame =  CGRectMake(0,offset,[self keyWindow].frame.size.width,[self keyWindow].frame.size.height-offset);
    [self keyWindow].bounds = CGRectMake(0, offset, [self keyWindow].frame.size.width,[self keyWindow].frame.size.height);
}

@end