自定义NavigationController导航栏

eg.

CZNavController.h

#import <UIKit/UIKit.h>

@interface CZNavController : UINavigationController

@end

CZNavController.m

#import "CZNavController.h"
#import "UIImage+Ex.h"
@interface CZNavController ()

@end

@implementation CZNavController

//此方法，会在CZNavController当前类，执行第一个方法之前先会执行一次，并且只会调用一次
+ (void)initialize{
    //设置导航条的样式
    UINavigationBar *navBar = [UINavigationBar appearance];
    //UIBarMetricsDefault  背景图片 在横竖屏都显示
    [navBar setBackgroundImage:[UIImage imageNamed:@"NavBar64"] forBarMetrics:UIBarMetricsDefault];
    //设置标题的颜色
    [navBar  setTitleTextAttributes:@{NSForegroundColorAttributeName:[UIColor  whiteColor]}];
}

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    
   
}

//重写导航控制器的push方法，每一个子控制器在跳转的时候都会调用此方法
- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated{
//viewController  就是子控制器，设置子控制器的自定义后退按钮
    
    //1  自定义后退按钮
    UIBarButtonItem *backItem = [[UIBarButtonItem alloc] initWithImage:[[UIImage imageNamed:@"NavBack"] originalImage] style:UIBarButtonItemStylePlain target:self action:@selector(backClick)];
    
    //
    UIBarButtonItem *fixedItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];
    fixedItem.width = -10;
    
    viewController.navigationItem.leftBarButtonItems = @[fixedItem,backItem];
    
    //自定义后退按钮后，手势返回上一级控制器的功能恢复
    self.interactivePopGestureRecognizer.delegate = nil;

    //当push的时候隐藏tabBar
    viewController.hidesBottomBarWhenPushed = YES;
    
    //真正的做了控制器之间的跳转
    [super pushViewController:viewController animated:animated];
}
- (void)backClick{
    [self popViewControllerAnimated:YES];
}
- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end