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一：首先查看一下關于UITabBarController的定義

NS_CLASS_AVAILABLE_IOS(2_0) @interface UITabBarController : UIViewController <UITabBarDelegate, NSCoding>
//設置控制器數組
@property(nullable, nonatomic,copy) NSArray<__kindof UIViewController *> *viewControllers;
//設置控制器數組 動畫
- (void)setViewControllers:(NSArray<__kindof UIViewController *> * __nullable)viewControllers animated:(BOOL)animated;
//選中的控制器
@property(nullable, nonatomic, assign) __kindof UIViewController *selectedViewController; 
//選中索引值
@property(nonatomic) NSUInteger selectedIndex;
//當item超過五個時 就會有一個更多
@property(nonatomic, readonly) UINavigationController *moreNavigationController; 

@property(nullable, nonatomic, copy) NSArray<__kindof UIViewController *> *customizableViewControllers; 
//tab條
@property(nonatomic,readonly) UITabBar *tabBar NS_AVAILABLE_IOS(3_0); 
//委托
@property(nullable, nonatomic,weak) id<UITabBarControllerDelegate> delegate;

@end

UITabBarController和UINavigationController一樣是用來管理試圖控制器的，與導航控制器不同，tabBarController控制器使用數組管理子試圖控制器的，并且子試圖之間是平等關系，導航控制器所管理的試圖控制器之間是在出桟和入桟的關系；

二：UITabBarControllerDelegate委托內容

@protocol UITabBarControllerDelegate <NSObject>
@optional
//返回NO，不能顯示選中的視圖控制器
- (BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController NS_AVAILABLE_IOS(3_0);

// NSLog(@"視圖顯示后調用");
- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController;

//將要開始自定義item時調用
- (void)tabBarController:(UITabBarController *)tabBarController willBeginCustomizingViewControllers:(NSArray<__kindof UIViewController *> *)viewControllers NS_AVAILABLE_IOS(3_0) __TVOS_PROHIBITED;

//將要結束自定義item時調用
- (void)tabBarController:(UITabBarController *)tabBarController willEndCustomizingViewControllers:(NSArray<__kindof UIViewController *> *)viewControllers changed:(BOOL)changed NS_AVAILABLE_IOS(3_0) __TVOS_PROHIBITED;

//結束自定義item的順序
- (void)tabBarController:(UITabBarController *)tabBarController didEndCustomizingViewControllers:(NSArray<__kindof UIViewController *> *)viewControllers changed:(BOOL)changed __TVOS_PROHIBITED;

- (UIInterfaceOrientationMask)tabBarControllerSupportedInterfaceOrientations:(UITabBarController *)tabBarController NS_AVAILABLE_IOS(7_0) __TVOS_PROHIBITED;
- (UIInterfaceOrientation)tabBarControllerPreferredInterfaceOrientationForPresentation:(UITabBarController *)tabBarController NS_AVAILABLE_IOS(7_0) __TVOS_PROHIBITED;

- (nullable id <UIViewControllerInteractiveTransitioning>)tabBarController:(UITabBarController *)tabBarController
                      interactionControllerForAnimationController: (id <UIViewControllerAnimatedTransitioning>)animationController NS_AVAILABLE_IOS(7_0);

- (nullable id <UIViewControllerAnimatedTransitioning>)tabBarController:(UITabBarController *)tabBarController
            animationControllerForTransitionFromViewController:(UIViewController *)fromVC
                                              toViewController:(UIViewController *)toVC  NS_AVAILABLE_IOS(7_0);

@end

三：UIViewController (UITabBarControllerItem)分類

@interface UIViewController (UITabBarControllerItem)
//當前視圖的UITabBarItem對象
@property(null_resettable, nonatomic, strong) UITabBarItem *tabBarItem; 
//如果視圖控制器是一個標簽欄控制器的子控制器，則返回它。否則返回nil
@property(nullable, nonatomic, readonly, strong) UITabBarController *tabBarController;

@end

四：關于UITabBar的定義

NS_CLASS_AVAILABLE_IOS(2_0) @interface UITabBar : UIView
//委托
@property(nullable,nonatomic,assign) id<UITabBarDelegate> delegate;     
//UITabBarItem集合
@property(nullable,nonatomic,copy) NSArray<UITabBarItem *> *items;      
//被選中的item
@property(nullable,nonatomic,assign) UITabBarItem *selectedItem; 
//批量設置items
- (void)setItems:(nullable NSArray<UITabBarItem *> *)items animated:(BOOL)animated; 

- (void)beginCustomizingItems:(NSArray<UITabBarItem *> *)items;   

- (BOOL)endCustomizingAnimated:(BOOL)animated;    

- (BOOL)isCustomizing;

//渲染色
@property(null_resettable, nonatomic,strong) UIColor *tintColor NS_AVAILABLE_IOS(5_0);
//背景色
@property(nullable, nonatomic,strong) UIColor *barTintColor NS_AVAILABLE_IOS(7_0) UI_APPEARANCE_SELECTOR; 
//被選中的圖片選染色
@property(nullable,nonatomic,strong) UIColor *selectedImageTintColor NS_DEPRECATED_IOS(5_0,8_0,"Use tintColor") UI_APPEARANCE_SELECTOR;
//背景圖
@property(nullable, nonatomic,strong) UIImage *backgroundImage NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;
//選中指示圖
@property(nullable, nonatomic,strong) UIImage *selectionIndicatorImage NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR; 
//陰影圖
@property(nullable, nonatomic,strong) UIImage *shadowImage NS_AVAILABLE_IOS(6_0) UI_APPEARANCE_SELECTOR;


@property(nonatomic) UITabBarItemPositioning itemPositioning NS_AVAILABLE_IOS(7_0) UI_APPEARANCE_SELECTOR;
//元素寬度
@property(nonatomic) CGFloat itemWidth NS_AVAILABLE_IOS(7_0) UI_APPEARANCE_SELECTOR;
//item間隔
@property(nonatomic) CGFloat itemSpacing NS_AVAILABLE_IOS(7_0) UI_APPEARANCE_SELECTOR;
//風格
@property(nonatomic) UIBarStyle barStyle NS_AVAILABLE_IOS(7_0) UI_APPEARANCE_SELECTOR;
//是否透明
@property(nonatomic,getter=isTranslucent) BOOL translucent NS_AVAILABLE_IOS(7_0);
@end

UITabBar包含多個UITabBarItem，每?個UITabBarItem對應?個UIViewController。UITabBar的?度是49；系統最多只顯?5個UITabBarItem，當UITabBarItem超過5個時系統會?動增加?個更多按鈕，點擊更多按鈕沒有在底部出現的按鈕會以列表的形式顯?出來.

五：UITabBarDelegate內容

@protocol UITabBarDelegate<NSObject>
@optional

- (void)tabBar:(UITabBar *)tabBar didSelectItem:(UITabBarItem *)item; // called when a new view is selected by the user (but not programatically)

- (void)tabBar:(UITabBar *)tabBar willBeginCustomizingItems:(NSArray<UITabBarItem *> *)items;                  

- (void)tabBar:(UITabBar *)tabBar didBeginCustomizingItems:(NSArray<UITabBarItem *> *)items;                     

- (void)tabBar:(UITabBar *)tabBar willEndCustomizingItems:(NSArray<UITabBarItem *> *)items changed:(BOOL)changed; 

- (void)tabBar:(UITabBar *)tabBar didEndCustomizingItems:(NSArray<UITabBarItem *> *)items changed:(BOOL)changed; 

@end

對于點擊哪個UITabBarItem響應事件則是在這個委托里面進行；由于UITabBarController已經遵守了UITabBarDelegate協議，如果有繼承UITabBarController已經可以直接運用UITabBarDelegate里面的內容；

知識點1：iOS 點擊UITabBar觸發刷新
平常我們在切換UITabBarController底部菜單時，它是不會有刷新的功能；如果要實現刷新的效果可以如下實現；原理如下,在監聽UITabBar點擊的方法中判斷本次點擊的UITabBarItem和上次點擊的是否一樣，如果一樣就發出通知,首先需要自定義一個UITabBarController (比如LLTabBarController);要判斷本次點擊的UITabBarItem和上次點擊的是否一樣，就需要定義一個屬性記錄下來上次點擊的UITabBarItem，并在viewWillAppear:方法中給該屬性賦值默認的UITabBarItem

/** 之前被選中的UITabBarItem */
@property (nonatomic, strong) UITabBarItem *lastItem;

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    // 將默認被選中的tabBarItem保存為屬性
    self.lastItem = self.tabBar.selectedItem;
}


- (void)tabBar:(UITabBar *)tabBar didSelectItem:(UITabBarItem *)item
{
    // 判斷本次點擊的UITabBarItem是否和上次的一樣
    if (item == self.lastItem) { // 一樣就發出通知
        [[NSNotificationCenter defaultCenter] postNotificationName:@"LLTabBarDidClickNotification" object:nil userInfo:nil];
    }
    // 將這次點擊的UITabBarItem賦值給屬性
    self.lastItem = item;
}

在需要實現點擊UITabBar觸發刷新功能的控制器中監聽通知

- (void)viewDidLoad {
    [super viewDidLoad];
    // 監聽UITabBarItem被重復點擊時的通知
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(tabBarDidClick) name:@"LLTabBarDidClickNotification" object:nil];
}


- (void)tabBarDidClick
{
    // 如果本控制器的view顯示在最前面，就下拉刷新
    if ([self.view isShowingOnKeyWindow]) { // 判斷一個view是否顯示在根窗口上，該方法在UIView的分類中實現
        [self.tableView.header beginRefreshing]; // MJRefresh
    }
}

判斷一個view是否顯示在根窗口上

/** 該方法在UIView的分類中實現 */
- (BOOL)isShowingOnKeyWindow
{
    UIWindow *keyWindow = [UIApplication sharedApplication].keyWindow;
    // 把這個view在它的父控件中的frame(即默認的frame)轉換成在window的frame
    CGRect convertFrame = [self.superview convertRect:self.frame toView: keyWindow];
    CGRect windowBounds = keyWindow.bounds;
    // 判斷這個控件是否在主窗口上（即該控件和keyWindow有沒有交叉）
    BOOL isOnWindow = CGRectIntersectsRect(convertFrame, windowBounds);
    // 再判斷這個控件是否真正顯示在窗口范圍內（是否在窗口上，是否為隱藏，是否透明）
    BOOL isShowingOnWindow = (self.window == keyWindow) && !self.isHidden && (self.alpha > 0.01) && isOnWindow;
    return isShowingOnWindow;
}

在控制器銷毀時要移除通知

- (void)dealloc{ // 移除通知
 [[NSNotificationCenter defaultCenter] removeObserver:self];}

六：UITabBarItem的定義

NS_CLASS_AVAILABLE_IOS(2_0) @interface UITabBarItem : UIBarItem 

- (instancetype)init NS_DESIGNATED_INITIALIZER;
//初始化幾中方式
- (nullable instancetype)initWithCoder:(NSCoder *)aDecoder NS_DESIGNATED_INITIALIZER;

- (instancetype)initWithTitle:(nullable NSString *)title image:(nullable UIImage *)image tag:(NSInteger)tag;
//初始化 標是 圖標 選中圖標
- (instancetype)initWithTitle:(nullable NSString *)title image:(nullable UIImage *)image selectedImage:(nullable UIImage *)selectedImage NS_AVAILABLE_IOS(7_0);

- (instancetype)initWithTabBarSystemItem:(UITabBarSystemItem)systemItem tag:(NSInteger)tag;

//給當前的分欄控制器的item設置一個選中狀態的圖片
@property(nullable, nonatomic,strong) UIImage *selectedImage NS_AVAILABLE_IOS(7_0);
//角標
@property(nullable, nonatomic, copy) NSString *badgeValue;    

//IOS7以后過期
- (void)setFinishedSelectedImage:(nullable UIImage *)selectedImage withFinishedUnselectedImage:(nullable UIImage *)unselectedImage NS_DEPRECATED_IOS(5_0,7_0,"Use initWithTitle:image:selectedImage: or the image and selectedImage properties along with UIImageRenderingModeAlwaysOriginal");

//IOS7以后過期
- (nullable UIImage *)finishedSelectedImage NS_DEPRECATED_IOS(5_0,7_0);
//IOS7以后過期
- (nullable UIImage *)finishedUnselectedImage NS_DEPRECATED_IOS(5_0,7_0);
//文字的偏移
@property (nonatomic, readwrite, assign) UIOffset titlePositionAdjustment NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;

@end

知識點1：tabBarItem相關屬性運用

1) 用來控制一組控制器的切換，類似選項卡，每個Tab控制一個試圖控制器，點擊哪個tab就顯示對應的試圖控制器，當前的試圖控制器

  2) 每個tabBarItem都可以設置title、image/selectedImages、badgeValue
  例如：

    （1）.給當前的分欄控制器的item設置一個標題
          self.tabBarItem.title = @"我的";
    （2）.給當前的分欄控制器的item設置一個圖片

          self.tabBarItem.image = [UIImage imageNamed:@"tab_buddy_nor@2x"];
    （3）.給當前的分欄控制器的item設置一個選中狀態的圖片

          self.tabBarItem.selectedImage = [UIImage imageNamed:@"tab_me_nor@2x"];//@2x表示給高清屏 30*30的效果好

          self.tabBarItem.badgeValue = @"new";//在小圖標的上面家字體加字體

  3) 設置選中的顏色

     分欄控制器.tabBar.tintColor
     self.tabBarController.tabBar.tintColor = [UIColor redColor]; 

  3) TabBar只能顯示五個tab Item，如果超過五個則會自動生成個Morede 標簽顯示剩余的Tab,這些Tab可以通過編輯顯示在UITabBar上（打開頁面后自動顯示在界面，點擊tabBar右邊）

  4) 自定義Item 

     [UITabBarItem alloc]initWithTitle: image: tag:

     [UITabBarItem alloc]initWithTabBarSystemItem:tag:

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UITabbarController,UITabbar

UITabbarController,UITabbar

三：UIViewController (UITabBarControllerItem)分類

四：關于UITabBar的定義

五：UITabBarDelegate內容

六：UITabBarItem的定義

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三个男躁一个女,国精产品一区一手机的秘密,麦子交换系列最经典十句话,欧美 国产 综合 欧美 视频

UITabbarController,UITabbar

三：UIViewController (UITabBarControllerItem)分類

四：關于UITabBar的定義

五：UITabBarDelegate內容

六：UITabBarItem的定義

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三个男躁一个女,国精产品一区一手机的秘密,麦子交换系列最经典十句话,欧美国产综合欧美视频