50、[ iOS ] UITabBarController 封装

效果图

1、新建一个继承 UITabBarController 的类，命名 TabBarController，生成 .h 和 .m 文件。

tabbar

2、在 .h 文件中

#import <UIKit/UIKit.h>

@interface TabBarController : UITabBarController

+ (instancetype)instance;

@end

3、在 .m 文件中

#import "TabBarController.h"
#import "AppDelegate.h"

// --四个 tabbarItem 分别对应的视图控制器
#import "MessageViewController.h"
#import "DiscoverViewController.h"
#import "ContactsViewController.h"
#import "MineViewController.h"

#define TabBarVC              @"vc"                //--tabbar对应的视图控制器
#define TabBarTitle           @"title"             //--tabbar标题
#define TabBarImage           @"image"             //--未选中时tabbar的图片
#define TabBarSelectedImage   @"selectedImage"     //--选中时tabbar的图片
#define TabBarItemBadgeValue  @"badgeValue"        //--未读个数
#define TabBarCount 4                              //--tabbarItem的个数

typedef NS_ENUM(NSInteger,TMTabType) {
  
    // --这里的顺序，决定了 tabbar 从左到右item的显示顺序
    TMTabTypeMessage,         //消息
    TMTabTypeDiscover,        //发现
    TMTabTypeContacts,        //联系人
    TMTabTypeMine,            //我的
};

@interface TabBarController ()

@property (nonatomic, strong)  NSDictionary *configs;

@end

@implementation TabBarController

+ (instancetype)instance {
    AppDelegate *appDelegate = (AppDelegate *)[UIApplication sharedApplication].delegate;
    UIViewController *vc     = appDelegate.window.rootViewController;
    if ([vc isKindOfClass:[TabBarController class]]) {
        
        return (TabBarController *)vc;
    
    }else {
        
        return nil;
    }
}

- (void)viewDidLoad {
    [super viewDidLoad];
    
    [self setUpSubNav];

}

- (NSArray*)tabbars{
    
    NSMutableArray *items = [[NSMutableArray alloc] init];
    for (NSInteger tabbar = 0; tabbar < TabBarCount; tabbar++) {
        [items addObject:@(tabbar)];
    }
    return items;
}

- (void)setUpSubNav {

    NSMutableArray *vcArray = [[NSMutableArray alloc] init];
    [self.tabbars enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
        NSDictionary * item =[self vcInfoForTabType:[obj integerValue]];
        NSString *vcName = item[TabBarVC];
        NSString *title  = item[TabBarTitle];
        NSString *imageName = item[TabBarImage];
        NSString *imageSelected = item[TabBarSelectedImage];
        Class clazz = NSClassFromString(vcName);
        UIViewController *vc = [[clazz alloc] initWithNibName:nil bundle:nil];
        vc.hidesBottomBarWhenPushed = NO;
        UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:vc];
        nav.tabBarItem = [[UITabBarItem alloc] initWithTitle:title
                                                       image:[UIImage imageNamed:imageName]
                                               selectedImage:[[UIImage imageNamed:imageSelected] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal]];
        nav.tabBarItem.tag = idx;
        NSInteger badge = [item[TabBarItemBadgeValue] integerValue];
        if (badge) {
            nav.tabBarItem.badgeValue = [NSString stringWithFormat:@"%zd",badge];
        }
        
        [[UITabBar appearance] setTintColor:[UIColor redColor]]; // 设置TabBar上 字体颜色

        [vcArray addObject:nav];
    }];
    self.viewControllers = [NSArray arrayWithArray:vcArray];
    
}

#pragma mark - VC
- (NSDictionary *)vcInfoForTabType:(TMTabType)type{
    
    if (_configs == nil)
    {
        _configs = @{
                     @(TMTabTypeMessage) : @{
                             TabBarVC           : @"MessageViewController",
                             TabBarTitle        : @"消息",
                             TabBarImage        : @"tabbar_message",
                             TabBarSelectedImage: @"tabbar_messageHL",
                             TabBarItemBadgeValue: @(1)
                             },
                     @(TMTabTypeDiscover)     : @{
                             TabBarVC           : @"DiscoverViewController",
                             TabBarTitle        : @"发现",
                             TabBarImage        : @"tabbar_discover",
                             TabBarSelectedImage: @"tabbar_discoverHL",
                             TabBarItemBadgeValue: @(0)

                             },
                     @(TMTabTypeContacts): @{
                             TabBarVC           : @"ContactsViewController",
                             TabBarTitle        : @"联系人",
                             TabBarImage        : @"tabbar_contacts",
                             TabBarSelectedImage: @"tabbar_contactsHL",
                             TabBarItemBadgeValue: @(0)

                             },
                     @(TMTabTypeMine)     : @{
                             TabBarVC           : @"MineViewController",
                             TabBarTitle        : @"我的",
                             TabBarImage        : @"tabbar_mine",
                             TabBarSelectedImage: @"tabbar_mineHL",
                             TabBarItemBadgeValue: @(0)

                             }
                     };
        
    }
    return _configs[@(type)];
}

@end

4、在 AppDelegate 的 didFinishLaunchingWithOptions 方法中调用

    TabBarController *tabBarC      = [[TabBarController alloc] init];
    self.window.rootViewController = tabBarC;