一 Status bar重叠问题：

～

 Zherui

        if ([[[UIDevicecurrentDevice] systemVersion] floatValue] >= 7.0) {

            self.window.frame =  CGRectMake(0,20,self.window.frame.size.width,self.window.frame.size.height-20);

//            self.window.bounds = CGRectMake(0, 20, self.window.frame.size.width, self.window.frame.size.height);

            UIApplication *myApp = [UIApplicationsharedApplication];

            [myApp setStatusBarStyle: UIStatusBarStyleLightContent];

        }

 然后 View controller-based status bar appearance --> NO

完了

～

方法一：隐藏Status bar   在plist里面增加2个变量  Status bar is initially hidden  -> YES   View controller-based status bar appearance -> NO

方法二：改为和IOS6 一样的显示方式  

  2. Set UIViewControllerBasedStatusBarAppearance to NO in info.plist (To opt out of having view controllers adjust the status bar style so that we can set the status bar style by using the UIApplicationstatusBarStyle method.)
  3. In AppDelegate's application:didFinishLaunchingWithOptions, call
    if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7) { [application setStatusBarStyle:UIStatusBarStyleLightContent]; self.window.clipsToBounds =YES; self.window.frame = CGRectMake(0,20,self.window.frame.size.width,self.window.frame.size.height-20); //Added on 19th Sep 2013 self.window.bounds = CGRectMake(0, 20, self.window.frame.size.width, self.window.frame.size.height); }

    方法三：

 

Set UIViewControllerBasedStatusBarAppearance to NO in info.plist

Pase this code in ​​- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions​​ method

if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7) {
            [application setStatusBarStyle:UIStatusBarStyleLightContent];
            self.window.clipsToBounds =YES;
            self.window.frame =  CGRectMake(0,20,self.window.frame.size.width,self.window.frame.size.height);

            //Added on 19th Sep 2013
            NSLog(@"%f",self.window.frame.size.height);
            self.window.bounds = CGRectMake(0,0, self.window.frame.size.width, self.window.frame.size.height);
        }


It may push down all your views by 20 pixels.To over come that use following code in ​​-(void)viewDidAppear:(BOOL)animated​​ method

if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7) {
        CGRect frame=self.view.frame;
        if (frame.size.height==[[NSUserDefaults standardUserDefaults] floatForKey:@"windowHeight"])
        {
            frame.size.height-=20;
        }
        self.view.frame=frame;
    }


You have to set windowHeight Userdefaults value after window allocation in didFinishLauncing Method like

self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
[[NSUserDefaults standardUserDefaults] setFloat:self.window.frame.size.height forKey:@"windowHeight"];
二  Navigation Bar重叠的问题：
在页面刚生成的时候 initWithNibName 函数 或者其他函数中加一句话：
if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7) {
self.edgesForExtendedLayout = UIRectEdgeNone;
}
显示方式就和IOS6 一致了。