多控制器使用和常见问题

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 *)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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