iOS解决显示 <-> 隐藏导航栏 顶部留白问题

• 创建一个 UINavigationController基类。

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#import <UIKit/UIKit.h>

@interface HKBaseNavigationController : UINavigationController

@end

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#import "HKBaseNavigationController.h"

@interface HKBaseNavigationController ()

@end

@implementation HKBaseNavigationController

- (void)viewDidLoad {

    [super viewDidLoad];

}

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

}

//重写pusView方法

- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated {

    [super pushViewController:viewController animated:animated];

    [self setNavigationBarHidden:NO animated:YES];

}

@end

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• 将上面创建的基类设置为app的主框架 - APPDelegate中设置

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- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

    // Override point for customization after application launch.

    self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];

    HKMainViewController *mainVC = [[HKMainViewController alloc] init];

    HKBaseNavigationController *baseNav = [[HKBaseNavigationController alloc] initWithRootViewController:mainVC];

    self.window.rootViewController = baseNav;

    [self.window makeKeyAndVisible];

    return YES;

}

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• 在需要隐藏导航栏的界面处

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- (void)viewWillAppear:(BOOL)animated {

    [super viewWillAppear:animated];

    [self.navigationController setNavigationBarHidden:YES animated:YES];

}

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