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多控制器使用和常见问题

多控制器使用和常见问题

作者: 简_爱SimpleLove | 来源:发表于2018-08-21 15:38 被阅读22次

    多控制器常用的有两种:一种是根控制是UITabBarController,另一种是根控制器是UINavigationController。

    如下图:


    根控制器是tabBar
    根控制器是navContr

    根控制器是tabBar

    这是我们常用的一种多控制器结构,设置根控制时用UITabBarController来包装,如下:

    - (void)styleOne {
        
        self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
        self.window.backgroundColor = [UIColor whiteColor];
        
        MainMenuTabBarController *mainMenuTabBarVCtr = [[MainMenuTabBarController alloc] init];
        self.window.rootViewController = mainMenuTabBarVCtr;
        
        [self.window makeKeyAndVisible];
        
    }
    

    这个需要注意的是,当push到下一级控制器的时候,我们要隐藏底部的tabBar。为了不每个页面,都处理,所以要想统一处理的话,我们要自定义一个UINavigationController。如下:

    #import "SJBaseNavCtr.h"
    
    @interface SJBaseNavCtr ()
    @end
    
    @implementation SJBaseNavCtr
    
    
    // 返回当前可视控制器的状态栏状态
    - (UIStatusBarStyle)preferredStatusBarStyle {
        return [self.visibleViewController preferredStatusBarStyle];
    }
    
    - (BOOL)prefersStatusBarHidden {
        return [self.visibleViewController prefersStatusBarHidden];
    }
    
    - (NSArray<UIViewController *> *)popToRootViewControllerAnimated:(BOOL)animated {
        
        // 返回到根控制器的时候,不隐藏tabBar
        self.hidesBottomBarWhenPushed = NO;
        return [super popToRootViewControllerAnimated:animated];
    }
    
    - (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated {
        
        // 当push到下层控制器的时候,隐藏底部的tabBar
        if (self.viewControllers.count) {
            self.hidesBottomBarWhenPushed = YES;
        }
        [super pushViewController:viewController animated:animated];
    }
    
    - (UIViewController *)popViewControllerAnimated:(BOOL)animated {
        
        if (self.viewControllers.count == 2) {
            self.hidesBottomBarWhenPushed = NO;
        }
        return [super popViewControllerAnimated:animated];
    }
    
    @end
    

    如果,还有别的什么全局的,也可以再这里设置,比如说返回按钮,和导航的主题颜色等等。

    然后底部的tabBar,我们可以用系统的,也可以用自己的。

    用系统的tabBar
    - (void)viewDidLoad {
        [super viewDidLoad];
        
        self.delegate = self;
        
        [self addChildController:[[LCNewTTBViewController alloc] init]
                       imageName:@"2-5首页1"
                   selectedImage:@"首页2_2-5" title:@"首页"];
        
        [self addChildController:[[LCDCBNewViewController alloc] init]
                       imageName:@"2-5定存宝1"
                   selectedImage:@"定存宝2_2-5"
                           title:@"定存宝"];
        
        [self addChildController:[[LCNewAccountController alloc] init]
                       imageName:@"2-5我的1"
                   selectedImage:@"我的2_2-5"
                           title:@"我的"];
        
        [self addChildController:[[LCNewMoreViewController alloc] init]
                       imageName:@"2-5更多1"
                   selectedImage:@"2-5更多2"
                           title:@"更多"];
    }
    
    
    //  设置tabBarItem的主题
    + (void)initialize {
        
        NSMutableDictionary *attrs = [NSMutableDictionary dictionary];
        attrs[NSFontAttributeName] = [UIFont systemFontOfSize:12];
        attrs[NSForegroundColorAttributeName] = [UIColor grayColor];
        
        NSMutableDictionary *selectedAttrs = [NSMutableDictionary dictionary];
        selectedAttrs[NSFontAttributeName] = [UIFont systemFontOfSize:12];
        selectedAttrs[NSForegroundColorAttributeName] = [UIColor colorWithHexString:LCNavBottomColor];
        
        UITabBarItem *item = [UITabBarItem appearance];
        
        [item setTitleTextAttributes:attrs forState:UIControlStateNormal];
        [item setTitleTextAttributes:selectedAttrs forState:UIControlStateFocused];
    }
    
    /**
     *  @brief  添加子控制器
     *
     *  @param  childVC     子控制期器
     *  @param  image   默认图片
     *  @param  selectedImage   选中图片
     *  @param  title   标题
     */
    - (void)addChildController:(UIViewController *)childVC
                     imageName:(NSString *)image
                 selectedImage:(NSString *)selectedImage
                         title:(NSString *)title
    {
        //设置文字和图片
        childVC.title = title;
        childVC.tabBarItem.image = [UIImage mr_imageOriginalWithName:image];
        childVC.tabBarItem.selectedImage = [UIImage mr_imageOriginalWithName:selectedImage];
        
        // 包装一个导航控制器,添加导航控制器为tabBarController的子控制器
        LCNavigationController *nav = [[LCNavigationController alloc] initWithRootViewController:childVC];
        
        [self addChildViewController:nav];
    }
    
    用自己的tabBar

    用自己的也分两种,可以是只是移除tabBar上面的子控件,然后将我们自定义的tabBarItem(也就是自定义的button)加上去:

    - (instancetype)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
        
        self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
        if (self) {
            
            // 所有初始化
            tabbarTitleAry = [NSArray arrayWithObjects:@"首页", @"论坛", @"发现", @"选车", @"我", nil];
            tabbarTitleImageAry = [NSArray arrayWithObjects:@"tabBar_home_normal.png",@"tabBar_category_normal.png", @"tabBar_find_normal.png", @"tabBar_cart_normal.png", @"tabBar_myJD_normal.png", nil];
            tabbarTitleHightImageAry = [NSArray arrayWithObjects:@"tabBar_home_press.png", @"tabBar_category_press.png", @"tabBar_find_press.png", @"tabBar_cart_press.png",@"tabBar_myJD_press.png", nil];
            
            _eocHomePageVC  = [[HomePageVCtr alloc] init];
            _eocForumVC     = [[ForumVCtr alloc] init];
            _eocFinderVC    = [[FindVCtr alloc] init];
            _eocSelectCarVC = [[SelectCarVCtr alloc] init];
            _eocUserInfoVC  = [[UserInfoVCtr alloc] init];
            
            [self styleOne];
    //        [self styleTwo];
        }
        
        self.selectedIndex = 0;
        return self;
    }
    
    - (void)styleOne {
        
        UINavigationController *navHome = [[SJBaseNavCtr alloc] initWithRootViewController:_eocHomePageVC];
        UINavigationController *navForum = [[SJBaseNavCtr alloc] initWithRootViewController:_eocForumVC];
        UINavigationController *navSelectCar = [[SJBaseNavCtr alloc] initWithRootViewController:_eocFinderVC];
        UINavigationController *navFinder = [[SJBaseNavCtr alloc] initWithRootViewController:_eocSelectCarVC];
        UINavigationController *navUserInfo = [[SJBaseNavCtr alloc] initWithRootViewController:_eocUserInfoVC];
        
        self.viewControllers = [NSArray arrayWithObjects:navHome, navForum, navSelectCar, navFinder, navUserInfo, nil];
    }
    - (void)viewDidLayoutSubviews {
        
        [super viewDidLayoutSubviews];
        if (!_eocTabBar) {
            [self createEocTabBar];
        }
    }
    
    - (void)createEocTabBar {
        
        float tabbarWidth = self.tabBar.frame.size.width;
        float tabbarHeight = self.tabBar.frame.size.height;
        
        // 创建一个和系统同样大小的tabBar
        _eocTabBar = [[UIView alloc] initWithFrame:CGRectMake(0, 0, tabbarWidth, tabbarHeight)];
        _eocTabBar.backgroundColor = [UIColor colorWithRed:240/255.0 green:240/255.0 blue:240/255.0 alpha:1];
    
        // 添加下面的每个tabBarItem
        float tabbarItemWidth = tabbarWidth/tabbarTitleAry.count;
        for (NSInteger i = 0; i < tabbarTitleAry.count; i++){
            
            TabBarButton *tabbarBt = [[TabBarButton alloc] init];
            [tabbarBt setFrame:CGRectMake(i*tabbarItemWidth, 0, tabbarItemWidth, tabbarHeight)];
            [tabbarBt addTarget:self action:@selector(selectMenuVC:) forControlEvents:UIControlEventTouchUpInside];
            tabbarBt.tag = i;
            
            [tabbarBt setBackgroundImage:[UIImage imageNamed:tabbarTitleImageAry[i]] forState:UIControlStateNormal];
            [tabbarBt setBackgroundImage:[UIImage imageNamed:tabbarTitleHightImageAry[i]] forState:UIControlStateSelected];
            
            [_eocTabBar addSubview:tabbarBt];
            if (i == 0) {
                _selectTabBarBtn = tabbarBt;
                _selectTabBarBtn.selected = YES;
            }
        }
        [self tabbarStyleOne];
        
    }
    - (void)selectMenuVC:(TabBarButton *)tabBarBtn {
        if (self.selectedIndex == tabBarBtn.tag) {
            return;
        }
        // 取消原来选中的,将新的选中
        self.selectedIndex = tabBarBtn.tag;
        _selectTabBarBtn.selected = NO;
        _selectTabBarBtn = tabBarBtn;
        _selectTabBarBtn.selected = YES;
    }
    
    - (void)tabbarStyleOne {
        
        // 移除掉所有的原生视图,remove
        NSArray *tabbarViewsAry = [self.tabBar subviews];
        for (UIView *view in tabbarViewsAry) {
            [view removeFromSuperview];
        }
        // 再将自己创建的tabBar添加上去
        [self.tabBar addSubview:_eocTabBar];
    }
    

    也可以直接移除掉原来的tabBar,将自己的tabBar加在原来tabBar的父控件上面,但是这样的话,自定义的导航条里面,系统的hidesBottomBarWhenPushed设置就没有作用了,所以也不太好用,一般用上面那种。

    - (void)tabbarStyleTwo {
        
        // 直接移除掉整个tabBar
        UIView *superView = [self.tabBar superview];
        _eocTabBar.frame = self.tabBar.frame;
        [self.tabBar removeFromSuperview];
        [superView addSubview:_eocTabBar];
    }
    
    导航title的设置

    正确的设置 self.navigationItem.title来操作(因为self.title操作会影响tabbar的item)
    tabbar(记得隐藏,因为爷控制器是tabbarViewCtr(儿的所有控制器(UINavigationController)默认都能看到tabbar))

    根控制器是navContr

    这种我们设置根控制器的时候,需要用UINavigationController包装在最外层,如下:

    - (void)styleTwo {
        
        self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
        self.window.backgroundColor = [UIColor whiteColor];
        
        MainMenuTabBarController *mainMenuTabBarVCtr = [[MainMenuTabBarController alloc] init];
        UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:mainMenuTabBarVCtr];
        self.window.rootViewController = nav;
        
        [self.window makeKeyAndVisible];
    }
    

    但是这个时候UINavigationController的根控制器里面,的设置需要如下:

    - (void)styleTwo {
        self.viewControllers = [NSArray arrayWithObjects:_eocHomePageVC, _eocForumVC, _eocFinderVC, _eocSelectCarVC, _eocUserInfoVC, nil];
    }
    

    不能再用导航控制器去包装一层了。

    导航title的设置

    正确的设置 self.tabBarController.title来操作(如果self.title操作会影响tabbar的item,但对nabbar没有效果,因为导航条属于爷控制器) navbar(记得刷新,共享了一个navbar)
    另外,需要注意的是self.tabBarController.title的设置需要写在viewWillAppear方法中,因为当点击下面的tabBar的时候,上面的导航栏还是同一个导航条,不会进行刷新。

    - (void)viewWillAppear:(BOOL)animated{
        [super viewWillAppear:animated];
        /*
         如果 self.tabBarController 在一个 UITabBarController多控制器(ATabbarVCtr)里面,那么self.tabBarController.title操作对这个ATabbarVCtr的tabbarItem的title有影响
         */
        self.tabBarController.title = @"发现";
    //    self.title = @"发现";
    }
    

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