[iOS基础控件 - 6.12.1] QQ菜单管理 UITabBarController 控制器管理

A.需求
1.类似QQ、微信顶部或者底部的窗口转换导航条
2.给每个页面添加相应内容

B.UITabBarController
1.基本概念：
（1）内容高度
iOS7之前内容高度为：屏幕高度 - 状态栏高度44 - 底部导航条高度49
iOS7及之后，内容高度为整个屏幕




2.使用代码创建初始化
（1）创建一个UITabBarController
UITabBarController的使用步骤

初始化UITabBarController

设置UIWindow的rootViewController为UITabBarController

根据具体情况，通过addChildViewController方法添加对应个数的子控制器

（2）添加子控制器

UITabBarController添加控制器的方式有2种

添加单个子控制器

- (void)addChildViewController:(UIViewController *)childController;

设置子控制器数组

@property(nonatomic,copy) NSArray *viewControllers;

如果UITabBarController有N个子控制器，那么UITabBar内部就会有N个UITabBarButton作为子控件
如果UITabBarController有4个子控制器，那么UITabBar的结构大致如下图所示




AppDelegate:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.

// 设置window
self.window = [[UIWindow alloc] init];
self.window.frame = [[UIScreen mainScreen] bounds];
self.window.backgroundColor = [UIColor grayColor];
[self.window makeKeyAndVisible];

// 设置一个UITabBarController
UITabBarController *tabBarController = [[UITabBarController alloc] init];
self.window.rootViewController = tabBarController;

// 添加子控制器
UIViewController *c1 = [[UIViewController alloc] init];
c1.view.backgroundColor = [UIColor redColor];
//    [tabBarController addChildViewController:c1];

UIViewController *c2 = [[UIViewController alloc] init];
c2.view.backgroundColor = [UIColor blueColor];
//    [tabBarController addChildViewController:c2];

UIViewController *c3 = [[UIViewController alloc] init];
c3.view.backgroundColor = [UIColor greenColor];

tabBarController.viewControllers = @[c1,c2,c3];

return YES;
}

（3）设置导航条选项样式
UITabBarButton里面显示什么内容，由对应子控制器的tabBarItem属性决定





UITabBarItem有以下属性影响着UITabBarButton的内容
标题文字
@property(nonatomic,copy) NSString *title;

图标
@property(nonatomic,retain) UIImage *image;

选中时的图标
@property(nonatomic,retain) UIImage *selectedImage;

提醒数字
@property(nonatomic,copy) NSString *badgeValue;

AppDelegate:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.

// 设置window
self.window = [[UIWindow alloc] init];
self.window.frame = [[UIScreen mainScreen] bounds];
self.window.backgroundColor = [UIColor grayColor];
[self.window makeKeyAndVisible];

// 设置一个UITabBarController
UITabBarController *tabBarController = [[UITabBarController alloc] init];
self.window.rootViewController = tabBarController;

// 添加子控制器
UIViewController *c1 = [[UIViewController alloc] init];
c1.view.backgroundColor = [UIColor redColor];
c1.tabBarItem.title = @"红色";
//    [tabBarController addChildViewController:c1];

UIViewController *c2 = [[UIViewController alloc] init];
c2.view.backgroundColor = [UIColor blueColor];
c2.tabBarItem.title = @"蓝色";
//    [tabBarController addChildViewController:c2];

UIViewController *c3 = [[UIViewController alloc] init];
c3.view.backgroundColor = [UIColor greenColor];
c3.tabBarItem.title = @"绿色";

tabBarController.viewControllers = @[c1,c2,c3];

return YES;
}

3.使用storyboard创建初始化
（1）拖入UITabBarController
（2）拖入N个UIViewController待用
（3）按照顺序连线，设置UITabBarController的子控制器








（4）设置子控制器的TabBarItem




out:




注意：Selected Image不设置，系统就会自动将原图编程蓝色作为 Selected Image

4.子控制器的生命周期
（1）单个子控制器的生命周期和普通的控制器生命周期一样

- (void)viewDidLoad {
[super viewDidLoad];
NSLog(@"%@ - viewDidLoad", self.class);
}

- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
NSLog(@"%@ - viewWillAppear", self.class);
}

- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
NSLog(@"%@ - viewDidAppear", self.class);
}

- (void) viewWillDisappear:(BOOL)animated {
[super viewWillDisappear:animated];
NSLog(@"%@ - viewWillDisappear", self.class);
}

- (void)viewDidDisappear:(BOOL)animated {
[super viewDidDisappear:animated];
NSLog(@"%@ - viewDidDisappear", self.class);
}

- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
NSLog(@"%@ - didReceiveMemoryWarning", self.class);
}

- (void)viewWillUnload {
[super viewWillUnload];
NSLog(@"%@ - viewWillUnload", self.class);
}

- (void)viewDidUnload {
[super viewDidUnload];
NSLog(@"%@ - viewDidUnload", self.class);
}

（2）两个子控制器切换的生命周期
a.出现第一个子控制器view
2014-12-27 21:11:44.338 UITabBarControllerByStoryboard[22567:590996] OneViewController - viewDidLoad
2014-12-27 21:11:44.340 UITabBarControllerByStoryboard[22567:590996] OneViewController - viewWillAppear
2014-12-27 21:11:44.407 UITabBarControllerByStoryboard[22567:590996] OneViewController - viewDidAppear

b.切换到第二个控制器view
2014-12-27 21:12:10.042 UITabBarControllerByStoryboard[22567:590996] TwoViewController - viewDidLoad
2014-12-27 21:12:10.042 UITabBarControllerByStoryboard[22567:590996] TwoViewController - viewWillAppear
2014-12-27 21:12:10.042 UITabBarControllerByStoryboard[22567:590996] OneViewController - viewWillDisappear
2014-12-27 21:12:10.054 UITabBarControllerByStoryboard[22567:590996] OneViewController - viewDidDisappear
2014-12-27 21:12:10.055 UITabBarControllerByStoryboard[22567:590996] TwoViewController - viewDidAppear

C.App框架
在每个子控制器之前再包装上一个NavigationController