项目架构(结构)搭建:主流结构(UITabBarController + 导航控制器)

/*
    项目架构(结构)搭建:主流结构(UITabBarController + 导航控制器)
    -> 项目开发方式 1.storyboard 2.纯代码
 */
@interface AppDelegate ()

@end

@implementation AppDelegate

// 程序启动的时候就会调用
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // 1.创建窗口
    self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];

    // 2.设置窗口根控制器
    UITabBarController *tabBarVc = [[UITabBarController alloc] init];
    self.window.rootViewController = tabBarVc;

    // 2.1 添加子控制器(5个子控制器) -> 自定义控制器 -> 划分项目文件结构
    // 精华
    XMGEssenceViewController *essenceVc = [[XMGEssenceViewController alloc] init];
    UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:essenceVc];
    // initWithRootViewController:push

    // tabBarVc:会把第0个子控制器的view添加去
    [tabBarVc addChildViewController:nav];

    // 新帖
    XMGNewViewController *newVc = [[XMGNewViewController alloc] init];
    UINavigationController *nav1 = [[UINavigationController alloc] initWithRootViewController:newVc];
    // tabBarVc:会把第0个子控制器的view添加去
    [tabBarVc addChildViewController:nav1];

    // 发布
    XMGPublishViewController *publishVc = [[XMGPublishViewController alloc] init];
    // tabBarVc:会把第0个子控制器的view添加去
    [tabBarVc addChildViewController:publishVc];

    // 关注
    XMGFriendTrendViewController *ftVc = [[XMGFriendTrendViewController alloc] init];
    UINavigationController *nav3 = [[UINavigationController alloc] initWithRootViewController:ftVc];
    // initWithRootViewController:push

    // tabBarVc:会把第0个子控制器的view添加去
    [tabBarVc addChildViewController:nav3];

    // 我
    XMGMeViewController *meVc = [[XMGMeViewController alloc] init];
    UINavigationController *nav4 = [[UINavigationController alloc] initWithRootViewController:meVc];
    // initWithRootViewController:push

    // tabBarVc:会把第0个子控制器的view添加去
    [tabBarVc addChildViewController:nav4];

    // 2.2 设置tabBar上按钮内容 -> 由对应的子控制器的tabBarItem属性
    // 0:nav
    nav.tabBarItem.title = @"精华";
    nav.tabBarItem.image = [UIImage imageNamed:@"tabBar_essence_icon"];
    nav.tabBarItem.selectedImage = [UIImage imageNamed:@"tabBar_essence_click_icon"];

    // 1:新帖
    nav1.tabBarItem.title = @"新帖";
    nav1.tabBarItem.image = [UIImage imageNamed:@"tabBar_new_icon"];
    nav1.tabBarItem.selectedImage = [UIImage imageNamed:@"tabBar_new_click_icon"];

    // 2:发布
    publishVc.tabBarItem.image = [UIImage imageNamed:@"tabBar_publish_icon"];
    publishVc.tabBarItem.selectedImage = [UIImage imageNamed:@"tabBar_publish_click_icon"];

    // 3.关注
    nav3.tabBarItem.title = @"关注";
    nav3.tabBarItem.image = [UIImage imageNamed:@"tabBar_friendTrends_icon"];
    nav3.tabBarItem.selectedImage = [UIImage imageNamed:@"tabBar_friendTrends_click_icon"];

    // 4.我
    nav4.tabBarItem.title = @"我";
    nav4.tabBarItem.image = [UIImage imageNamed:@"tabBar_me_icon"];
    nav4.tabBarItem.selectedImage = [UIImage imageNamed:@"tabBar_me_click_icon"];

    /*
        问题:
        1.选中的图片被渲染
        2.选中标题颜色:黑色 标题字体大
        3.发布按钮显示不出来
     */

    // 3.显示窗口 1.成为UIApplication主窗口 2.
    [self.window makeKeyAndVisible];

    return YES;
}

自定义tabbarController，代码调整后

/*
    项目架构(结构)搭建:主流结构(UITabBarController + 导航控制器)
    -> 项目开发方式 1.storyboard 2.纯代码
 */
@interface AppDelegate ()

@end

@implementation AppDelegate

// 自定义类:1.可以管理自己业务
// 封装:谁的事情谁管理 =. 方便以后去维护代码

// 程序启动的时候就会调用
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

    // 1.创建窗口
    self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];

    // 2.设置窗口根控制器
    XMGTabBarController *tabBarVc = [[XMGTabBarController alloc] init];
    self.window.rootViewController = tabBarVc;

    /*
        问题:
        1.选中的图片被渲染
        2.选中标题颜色:黑色 标题字体大
        3.发布按钮显示不出来
     */

    // 3.显示窗口 1.成为UIApplication主窗口 2.
    [self.window makeKeyAndVisible];

    return YES;
}

#import "XMGTabBarController.h"
#import "XMGEssenceViewController.h"
#import "XMGFriendTrendViewController.h"
#import "XMGMeViewController.h"
#import "XMGNewViewController.h"
#import "XMGPublishViewController.h"

@interface XMGTabBarController ()

@end

@implementation XMGTabBarController

#pragma mark - 生命周期方法
- (void)viewDidLoad {
    [super viewDidLoad];

    // Do any additional setup after loading the view.
    // 1 添加子控制器(5个子控制器) -> 自定义控制器 -> 划分项目文件结构
    [self setupAllChildViewController];

    // 2 设置tabBar上按钮内容 -> 由对应的子控制器的tabBarItem属性
    [self setupAllTitleButton];

}

#pragma mark - 添加所有子控制器
- (void)setupAllChildViewController
{
    // 精华
    XMGEssenceViewController *essenceVc = [[XMGEssenceViewController alloc] init];
    UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:essenceVc];
    // initWithRootViewController:push

    // tabBarVc:会把第0个子控制器的view添加去
    [self addChildViewController:nav];

    // 新帖
    XMGNewViewController *newVc = [[XMGNewViewController alloc] init];
    UINavigationController *nav1 = [[UINavigationController alloc] initWithRootViewController:newVc];
    // tabBarVc:会把第0个子控制器的view添加去
    [self addChildViewController:nav1];

    // 发布
    XMGPublishViewController *publishVc = [[XMGPublishViewController alloc] init];
    // tabBarVc:会把第0个子控制器的view添加去
    [self addChildViewController:publishVc];

    // 关注
    XMGFriendTrendViewController *ftVc = [[XMGFriendTrendViewController alloc] init];
    UINavigationController *nav3 = [[UINavigationController alloc] initWithRootViewController:ftVc];
    // initWithRootViewController:push

    // tabBarVc:会把第0个子控制器的view添加去
    [self addChildViewController:nav3];

    // 我
    XMGMeViewController *meVc = [[XMGMeViewController alloc] init];
    UINavigationController *nav4 = [[UINavigationController alloc] initWithRootViewController:meVc];
    // initWithRootViewController:push

    // tabBarVc:会把第0个子控制器的view添加去
    [self addChildViewController:nav4];

}

// 设置tabBar上所有按钮内容
- (void)setupAllTitleButton
{
    // 0:nav
    UINavigationController *nav = self.childViewControllers[0];
    nav.tabBarItem.title = @"精华";
    nav.tabBarItem.image = [UIImage imageNamed:@"tabBar_essence_icon"];
    nav.tabBarItem.selectedImage = [UIImage imageNamed:@"tabBar_essence_click_icon"];

    // 1:新帖
    UINavigationController *nav1 = self.childViewControllers[1];
    nav1.tabBarItem.title = @"新帖";
    nav1.tabBarItem.image = [UIImage imageNamed:@"tabBar_new_icon"];
    nav1.tabBarItem.selectedImage = [UIImage imageNamed:@"tabBar_new_click_icon"];

    // 2:发布
    XMGPublishViewController *publishVc = self.childViewControllers[2];
    publishVc.tabBarItem.image = [UIImage imageNamed:@"tabBar_publish_icon"];
    publishVc.tabBarItem.selectedImage = [UIImage imageNamed:@"tabBar_publish_click_icon"];

    // 3.关注
    UINavigationController *nav3 = self.childViewControllers[3];
    nav3.tabBarItem.title = @"关注";
    nav3.tabBarItem.image = [UIImage imageNamed:@"tabBar_friendTrends_icon"];
    nav3.tabBarItem.selectedImage = [UIImage imageNamed:@"tabBar_friendTrends_click_icon"];

    // 4.我
    UINavigationController *nav4 = self.childViewControllers[4];
    nav4.tabBarItem.title = @"我";
    nav4.tabBarItem.image = [UIImage imageNamed:@"tabBar_me_icon"];
    nav4.tabBarItem.selectedImage = [UIImage imageNamed:@"tabBar_me_click_icon"];

}
- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

@end