UITabBarController、UITabBar

1、UITabBarController的使用:

tabBar是UITabBar的对象，包含多个tabBarItem，每个item对应一个UIViewController,当tabBarItem超过五个时，会出现一个更多按钮

2.重要属性

viewControllers:要显示的视图控制器，是一个数组

tabBar：标签栏

代理:self

3.主要代码

将tabBarController作为窗口的根视图控制器

#import "AppDelegate.h"

//2.遵循代理协议
@interface AppDelegate ()<UITabBarControllerDelegate>

@end

@implementation AppDelegate


- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    
    #pragma mark--------创建多个被导航控制器包裹的视图控制器
    
    RedViewController  *redVC = [RedViewController new];
    UINavigationController *redNC = [[UINavigationController alloc] initWithRootViewController:redVC];
    
    
    
    
    OrangeViewController *orangeVC = [OrangeViewController new];
    UINavigationController *orangeNC = [[UINavigationController alloc] initWithRootViewController:orangeVC];
    
    
    
    YellowViewController *yellowVC = [YellowViewController new];
    UINavigationController *yellowNC = [[UINavigationController alloc] initWithRootViewController:yellowVC];
    
    
    
    GreenViewController *greenVC = [GreenViewController new];
    UINavigationController *greenNC = [[UINavigationController alloc] initWithRootViewController:greenVC];
    
    
    
    CyanViewController *cyanVC = [CyanViewController new];
    UINavigationController *cyanNC = [[UINavigationController alloc] initWithRootViewController:cyanVC];
    
    
    
    BlueViewController *blueVC = [BlueViewController new];
    UINavigationController *blueNC = [[UINavigationController alloc] initWithRootViewController:blueVC];
    
    
    PurpleViewController *purpleVC = [PurpleViewController new];
    UINavigationController *purpleNC = [[UINavigationController alloc] initWithRootViewController:purpleVC];
    
    
    
#pragma mark------------tabBarController-------
    
    //创建tabBarController
    UITabBarController *tabBC = [UITabBarController new];
    
    //准备视图控制器(子视图控制器)
    NSArray *array = @[redNC,orangeNC,yellowNC,greenNC,cyanNC,blueNC,purpleNC];
    
    //设定子视图控制器
    tabBC.viewControllers = array;
    
    //设置标题颜色
    tabBC.tabBar.tintColor = [UIColor magentaColor];
    
    //设置tabBar的背景颜色
    //tabBC.tabBar.barTintColor = [UIColor lightGrayColor];
    
    //tabBar的默认高度为49
    
    //tabBar的样式
    //tabBC.tabBar.barStyle = UIBarStyleBlack;
    
    //添加背景图片
    //tabBC.tabBar.backgroundImage = [UIImage imageNamed:@"image1"];
    
    //为窗口指定根视图控制器
    self.window.rootViewController = tabBC;
    
    self.window.backgroundColor = [UIColor whiteColor];
    
    [self.window makeKeyAndVisible];
    
    
    
    
#pragma mark---------添加tabBarItem点击事件
    
    //设置选中的下标
    tabBC.selectedIndex = 0;
    
//    NSLog(@"%ld",tabBC.selectedIndex);
    
    
#pragma mark---------带值value
    
    //设置badgeValue(设置标记)
    redNC.tabBarItem.badgeValue = @"New";
    
    
    
    
#pragma mark------------实现tabBarController的代理
    
    //1.设置代理对象
    tabBC.delegate = self;
    
    
#pragma mark------------一键换肤
    [[UINavigationBar appearance] setBarTintColor:[UIColor whiteColor]];
    
    
 return YES;
}


//3.实现代理方法

//将要选中当前控制器的触发方法

//一般在该方法中先开始解析数据，加载一个可以替换的视图
-(BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController
{
    NSLog(@"%d,%s",__LINE__,__FUNCTION__);
    return YES;
}


//已经选中当前控制器的触发方法

//通常在点击到该视图控制器中替换视图
-(void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController
{
    NSLog(@"%d,%s",__LINE__,__FUNCTION__);
}

4.创建tabBar的三种方法

#pragma mark------------三种创建tabBarItem
        
        //根据给定的系统样式来创建
//        self.tabBarItem = [[UITabBarItem alloc] initWithTabBarSystemItem:UITabBarSystemItemTopRated tag:1];
        
        
        //根据标题设置设置自定义的标题项
//    self.tabBarItem = [[UITabBarItem alloc] initWithTitle:@"Red" image:[UIImage imageNamed:@"07-map-marker.png"] selectedImage:[UIImage imageNamed:@"07-map-marker.png"]];
        
        
        //自定义标题和图片
//        self.tabBarItem = [[UITabBarItem alloc] initWithTitle:@"Red" image:[UIImage imageNamed:@"99-umbrella"] tag:1];
        
        
        
//        //渲染
//        UIImage *image = [UIImage imageNamed:@"shishi.jpg"];
//        
//        //渲染为原色版本
//        image = [image imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
//        
//        //自定义标题和图片
//    self.tabBarItem = [[UITabBarItem alloc] initWithTitle:@"红" image:image tag:1];
        
        
        
        self.tabBarItem = [[UITabBarItem alloc] initWithTitle:@"首页" image:[UIImage imageNamed:@"iconfont-shouye"] tag:1];
        
    }