仿脉脉登录效果

因为项目需要用类似脉脉的登录样式，所以记录一下项目的主框架搭建。脉脉使用的是NavigationController+TabBarController搭建，但是登录的效果是push过去的，首先主框架是不变的，那么就是登录push的效果了，一开始我想的是直接push到主框架搭建好的界面，但是导航栏会出现问题，所以放弃了。我采用的是修改TabBarController管理的第一个控制器，如果没有登录就显示登录界面，隐藏TabBar,如果是登录了就直接显示主页。

首先自定义NavigationController和TabBarController,方便扩展,其次创建4个tabBar管理的控制器，在tabBarController的操作如下：

#import "BaseTabBarController.h"
#import "BaseNavigationController.h"
#import "DynamicViewController.h"
#import "MessageViewController.h"
#import "MineViewController.h"
#import "ContactsViewController.h"
#import "LoginController.h"

#define kClassKey   @"DynamicViewController"
#define kTitleKey   @"MessageViewController"
#define kImgKey     @"ContactsViewController"
#define kSelImgKey  @"MineViewController"
@interface BaseTabBarController ()

@end

@implementation BaseTabBarController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    NSArray *childItemsArray = @[@{kClassKey: @"DynamicViewController",
                                   kTitleKey: @"动态",
                                   kImgKey: @"shouye",
                                   kSelImgKey: @""},
                                 @{kClassKey: @"MessageViewController",
                                   kTitleKey: @"消息",
                                   kImgKey: @"xiaoxi",
                                   kSelImgKey: @""},
                                 @{kClassKey: @"ContactsViewController",
                                   kTitleKey: @"人脉办事",
                                   kImgKey: @"faxian",
                                   kSelImgKey: @""},
                                 @{kClassKey: @"MineViewController",
                                   kTitleKey: @"我",
                                   kImgKey: @"wode",
                                   kSelImgKey: @""
                                   }
                                 ];
    [childItemsArray enumerateObjectsUsingBlock:^(NSDictionary *dict, NSUInteger idx, BOOL * _Nonnull stop) {
        UIViewController *vc = [NSClassFromString(dict[kClassKey]) new];
        vc.title = dict[kTitleKey];
        BaseNavigationController *nav = [[BaseNavigationController alloc] initWithRootViewController:vc];
#warning 需判断登录状态
        BOOL isLogin = [[NSUserDefaults standardUserDefaults] boolForKey:@"isLogin"];
        if (isLogin == NO && idx == 0) {
            nav = [[BaseNavigationController alloc] initWithRootViewController:[LoginController new]];
            self.tabBar.hidden = YES;
        }
        UITabBarItem *item = nav.tabBarItem;
        item.title = dict[kTitleKey];
        item.image = [UIImage imageNamed:dict[kImgKey]];
        item.selectedImage = [[UIImage imageNamed:dict[kSelImgKey]] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
        [item setTitleTextAttributes:@{NSForegroundColorAttributeName : [UIColor greenColor]} forState:UIControlStateSelected];
        [self addChildViewController:nav];
    }];
    
    self.view.backgroundColor = [UIColor whiteColor];
    self.tabBar.translucent = NO;
}

还需要在主界面里做设置，就是tabBar管理的第一个控制器：

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    
    if ([self isKindOfClass:[DynamicViewController class]]) {
        
        self.tabBarController.tabBar.hidden = NO;
    }else{
        self.tabBarController.tabBar.hidden = YES;
    }
}

在退出的时候也要做处理，我只是写的demo所以直接用的按钮点击。项目里是放在了我的界面里，使用tabbleView静态单元格来展示，有退出按钮的点击

- (void)clickLogoutBtn: (UIButton *)sender
{

    [[NSUserDefaults standardUserDefaults] setBool:NO forKey:@"isLogin"];
    [[NSUserDefaults standardUserDefaults] synchronize];
    
    [self.tabBarController.childViewControllers enumerateObjectsUsingBlock:^(__kindof UINavigationController * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
        
        if (idx == 0) {
            self.tabBarController.selectedIndex = 0;
                
            [obj popToRootViewControllerAnimated:YES];
            self.tabBarController.tabBar.hidden = YES;
            [self.navigationController popToRootViewControllerAnimated:YES];
            
        }
        
    }];
}