OC 简单的自定义BaseNavigationController与BaseViewController

1.创建控制器BaseNavigationController继承自UINavigationController:

#import "BaseNavigationController.h"

@interface BaseNavigationController ()<UINavigationControllerDelegate>

@end

@implementation BaseNavigationController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    self.delegate = self;
    //设置navigationBar颜色
    [self.navigationBar setBackgroundImage:[UIImage imageWithColor:App_Main_Color rect:CGRectMake(0, 0, UI_SCREEN_WIDTH, HeightForNagivationBarAndStatusBar)] forBarMetrics:UIBarMetricsDefault];
    //毛玻璃效果
    self.navigationBar.translucent = NO;
    //设置标题的样式
    [self.navigationBar setTitleTextAttributes:@{NSForegroundColorAttributeName:[UIColor whiteColor]}];
}
#pragma mark - 控制器视图将要出现时
- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated {
    //通过对当前navigationController中viewControllers的数量来判断是否需要隐藏tabBar
    if (self.viewControllers.count > 1) {
        self.tabBarController.tabBar.hidden = YES;
    }else {
        self.tabBarController.tabBar.hidden = NO;
    }
}

2.创建BaseViewControllerk继承自UIViewController：

#import "BaseViewController.h"

@interface BaseViewController ()

@end

@implementation BaseViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    self.view.backgroundColor = [UIColor groupTableViewBackgroundColor];
    //判断是否有上级页面来确定是否显示返回按钮
    if (self.navigationController.viewControllers.count > 1) {
        [self setLeftBarButton];
    }
}
#pragma mark - 自定义返回按钮
- (void)setLeftBarButton{
    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc]initWithImage:[UIImage imageNamed:@"icon-fh"] style:UIBarButtonItemStylePlain target:self action:@selector(leftBarButtonClick)];
}
#pragma mark - 返回按钮点击事件
- (void)leftBarButtonClick{
    [self.navigationController popViewControllerAnimated:YES];
}

3.在AppDelegate中对上述两个基类简单实用：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    Item1ViewController *v1 = [[Item1ViewController alloc]init];
    BaseNavigationController *n1 = [[BaseNavigationController alloc]initWithRootViewController:v1];
    Item2ViewController *v2 = [[Item2ViewController alloc]init];
    BaseNavigationController *n2 = [[BaseNavigationController alloc]initWithRootViewController:v2];
    
    self.tabBarController = [[BaseTabBarController alloc]init];
    self.tabBarController.viewControllers = @[n1,n2];
    
    UITabBar *tabBar = self.tabBarController.tabBar;
    
    UITabBarItem *item1 = [tabBar.items objectAtIndex:0];
    item1.title = @"item1";
    
    UITabBarItem *item2 = [tabBar.items objectAtIndex:1];
    item2.title = @"item2";
    
    self.window.rootViewController = self.tabBarController;
    
    return YES;
}