[iOS基础控件

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