#import <Foundation/Foundation.h>
#import <UIKit/UIViewController.h>
#import <UIKit/UIViewControllerTransitioning.h>
#import <UIKit/UIKitDefines.h>
#import <UIKit/UITabBar.h>


@class UIView, UIImage, UINavigationController, UITabBarItem;
@protocol UITabBarControllerDelegate;

#pragma - mark - 声明
NS_CLASS_AVAILABLE_IOS(2_0) @interface UITabBarController : UIViewController <UITabBarDelegate, NSCoding>

@property(nonatomic,copy) NSArray *viewControllers;     // 所有子控制器
- (void)setViewControllers:(NSArray *)viewControllers animated:(BOOL)animated;

@property(nonatomic,assign) UIViewController *selectedViewController; // 选中的控制器

#pragma - mark 通过index切换选中的控制器
@property(nonatomic) NSUInteger selectedIndex;

// 如果子控制器太多。会自动将一部分子控制器放入一个 UINavigationController 中，并显示 More 按钮，不要手动让其显示在界面上，系统自动执行；
@property(nonatomic,readonly) UINavigationController *moreNavigationController;
@property(nonatomic,copy) NSArray *customizableViewControllers;

@property(nonatomic,readonly) UITabBar *tabBar NS_AVAILABLE_IOS(3_0);
@property(nonatomic,assign) id<UITabBarControllerDelegate> delegate;

@end


#pragma - mark - 代理方法
@protocol UITabBarControllerDelegate <NSObject>
@optional
// 控制器是否能被选中
- (BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController NS_AVAILABLE_IOS(3_0);
// 已经选中一个控制器后执行的方法
- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController;

- (void)tabBarController:(UITabBarController *)tabBarController willBeginCustomizingViewControllers:(NSArray *)viewControllers NS_AVAILABLE_IOS(3_0);
- (void)tabBarController:(UITabBarController *)tabBarController willEndCustomizingViewControllers:(NSArray *)viewControllers changed:(BOOL)changed NS_AVAILABLE_IOS(3_0);
- (void)tabBarController:(UITabBarController *)tabBarController didEndCustomizingViewControllers:(NSArray *)viewControllers changed:(BOOL)changed;

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

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

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

@end

@interface UIViewController (UITabBarControllerItem)

@property(nonatomic,retain) UITabBarItem *tabBarItem;

@property(nonatomic,readonly,retain) UITabBarController *tabBarController;

@end