UITabBarController的UIViewController动态改变数量

男娘i 2023-06-07 10:52 21阅读 0赞

`UITabBarController`的`UIViewController`动态改变数量，即在启动APP后，根据登录用户的权限不同，动态设置`UIViewController`的显示或隐藏。

实现原理

通过重置`UITabBarController`的`viewControllers`属性来实现。

示例代码

> 示例的实现是继承`UITabBarController`重写了一个`BaseTabBarController`

// 定义视图控制器可变数组
    - (NSMutableArray *)navControllers
    { 
        if (_navControllers == nil) { 
            _navControllers = [[NSMutableArray alloc] init];
            //
            NSArray *vcs = @[self.mainVC, self.addVC, self.mineVC];
            NSArray *vcTitle = @[@"首页", @"加", @"我的"];
            NSArray *vcImage = @[@"homeNormal", @"addNormal", @"mineNormal"];
            NSArray *vcSelected = @[@"homeSelected", @"addSelected", @"mineSelected"];
            //
            for (int index = 0; index < vcs.count; index++) { 
                UIViewController *controller = vcs[index];
                NSString *title = vcTitle[index];
                NSString *imageNormal = vcImage[index];
                NSString *imageSelected = vcSelected[index];
                
                controller.title = title;
                controller.tabBarItem.image = [UIImage imageNamed:imageNormal];
                controller.tabBarItem.selectedImage = [UIImage imageNamed:imageSelected];
                // 导航视图控制器
                UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:controller];
                [_navControllers addObject:nav];
            }
        }
        return _navControllers;
    }

// 改变视图控制器数量
    - (void)reloadVC:(BOOL)isAdd
    {    
        if (isAdd) { 
            // 增加
            UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:self.discoverVC];
            self.discoverVC.title = @"发现";
            self.discoverVC.tabBarItem.image = [UIImage imageNamed:@"discoverNormal"];
            self.discoverVC.tabBarItem.selectedImage = [UIImage imageNamed:@"discoverSelected"];
            
            [self.navControllers insertObject:nav atIndex:2];
        } else { 
            // 删除
            [self.navControllers removeObjectAtIndex:2];
        }
        // 重置改变数量
        self.viewControllers = self.navControllers;
    }

// 使用 在AppDelegate中定义成属性
    #import <UIKit/UIKit.h>
    #import "BaseTabBarController.h"
    
    @interface AppDelegate : UIResponder <UIApplicationDelegate>
    
    @property (strong, nonatomic) UIWindow *window;
    
    @property (nonatomic, strong) BaseTabBarController *rootVC;
    
    @end

// 调用改变控制的数量
    AppDelegate *delegate = (AppDelegate *)UIApplication.sharedApplication.delegate;
    [delegate.rootVC reloadVC:YES]; // 新增
    [delegate.rootVC reloadVC:NO]; // 删除