├── CYLTabBarController  ＃核心库文件夹，如果不使用 CocoaPods 集成，请直接将这个文件夹拖拽带你的项目中
└── Example
   └── Classes
       ├── Module       #模块类文件夹
       │   ├── Home
       │   ├── Message
       │   ├── Mine
       │   └── SameCity
       └── View         #这里放着 CYLPlusButton 的子类 CYLPlusButtonSubclass，演示了如何创建自定义的形状不规则加号按钮
       
       

//MainTabBarController

@interface MainTabBarController : CYLTabBarController
@end


- (instancetype)init {
   if (!(self = [super init])) {
       return nil;
   }
   /**
    * 以下两行代码目的在于手动设置让TabBarItem只显示图标，不显示文字，并让图标垂直居中。
    * 等效于在 `-tabBarItemsAttributesForController` 方法中不传 `CYLTabBarItemTitle` 字段。
    * 更推荐后一种做法。
    */
   UIEdgeInsets imageInsets = UIEdgeInsetsZero;//UIEdgeInsetsMake(4.5, 0, -4.5, 0);
   UIOffset titlePositionAdjustment = UIOffsetMake(0, -3.5);
   CYLTabBarController *tabBarController = [CYLTabBarController tabBarControllerWithViewControllers:self.viewControllers
                                                                              tabBarItemsAttributes:self.tabBarItemsAttributesForController
                                                                                        imageInsets:imageInsets
                                                                            titlePositionAdjustment:titlePositionAdjustment
                                                                                            context:nil
                                            ];
   [self customizeTabBarAppearance:tabBarController];
   self.navigationController.navigationBar.hidden = YES;
   return (self = (MainTabBarController *)tabBarController);
}

- (NSArray *)viewControllers {
   CYLHomeViewController *firstViewController = [[CYLHomeViewController alloc] init];
   UIViewController *firstNavigationController = [[CYLBaseNavigationController alloc]
                                                  initWithRootViewController:firstViewController];
   [firstViewController cyl_setHideNavigationBarSeparator:YES];
   CYLSameCityViewController *secondViewController = [[CYLSameCityViewController alloc] init];
   UIViewController *secondNavigationController = [[CYLBaseNavigationController alloc]
                                                   initWithRootViewController:secondViewController];
   [secondViewController cyl_setHideNavigationBarSeparator:YES];
   NSArray *viewControllers = @[
                                firstNavigationController,
                                secondNavigationController,
                                ];
   return viewControllers;
}

- (NSArray *)tabBarItemsAttributesForController {
   NSDictionary *firstTabBarItemsAttributes = @{
                                                CYLTabBarItemTitle : @"首页",
                                                CYLTabBarItemImage : self.darkMode ? @"home_highlight" : @"home_normal",  /* NSString and UIImage are supported*/
                                                CYLTabBarItemSelectedImage : @"home_highlight",  /* NSString and UIImage are supported*/
                                                };
   NSDictionary *secondTabBarItemsAttributes = @{
                                                 CYLTabBarItemTitle : @"鱼塘",
                                                 CYLTabBarItemImage : self.darkMode ? @"fishpond_highlight" : @"fishpond_normal",
                                                 CYLTabBarItemSelectedImage : @"fishpond_highlight",
                                                 };
   

   NSArray *tabBarItemsAttributes = @[
                                      firstTabBarItemsAttributes,
                                      secondTabBarItemsAttributes,
                                      ];
   return tabBarItemsAttributes;
}

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
/* *省略部分：   * */
   [self.window setRootViewController:self.tabBarController];
/* *省略部分：   * */
   return YES;
}

+ (void)load {
   [super registerPlusButton];
}

+ (NSUInteger)indexOfPlusButtonInTabBar;
+ (CGFloat)multiplierOfTabBarHeight:(CGFloat)tabBarHeight;
+ (UIViewController *)plusChildViewController;
+ (BOOL)shouldSelectPlusChildViewController;

+ (NSUInteger)indexOfPlusButtonInTabBar;

+ (CGFloat)multiplierOfTabBarHeight:(CGFloat)tabBarHeight;

+ (CGFloat)constantOfPlusButtonCenterYOffsetForTabBarHeight:(CGFloat)tabBarHeight;

+ (UIViewController *)plusChildViewController;

   //去除 TabBar 自带的顶部阴影
   [[UITabBar appearance] setShadowImage:[[UIImage alloc] init]];        

TabBarItem 宽度 ＝  ( TabBar 总宽度 －  PlusButton 宽度  ) / (TabBarItem 个数)

[button sizeToFit]; 

button.frame = CGRectMake(0.0, 0.0, 250, 100);
button.backgroundColor = [UIColor redColor];

/**
*  tabBarItem 的选中和不选中文字属性、背景图片
*/
- (void)customizeInterface {
   
   // 普通状态下的文字属性
   NSMutableDictionary *normalAttrs = [NSMutableDictionary dictionary];
   normalAttrs[NSForegroundColorAttributeName] = [UIColor grayColor];
   
   // 选中状态下的文字属性
   NSMutableDictionary *selectedAttrs = [NSMutableDictionary dictionary];
   selectedAttrs[NSForegroundColorAttributeName] = [UIColor darkGrayColor];
   
   // 设置文字属性
   UITabBarItem *tabBar = [UITabBarItem appearance];
   [tabBar setTitleTextAttributes:normalAttrs forState:UIControlStateNormal];
   [tabBar setTitleTextAttributes:selectedAttrs forState:UIControlStateSelected];
   
   // 设置背景图片
   UITabBar *tabBarAppearance = [UITabBar appearance];
   [tabBarAppearance setBackgroundImage:[UIImage imageNamed:@"tabbar_background"]];
}

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
/* *省略部分：   * */
   [self.window makeKeyAndVisible];
   [self customizeInterface];
   return YES;
}

//CYLTabBarController.h

@protocol CYLTabBarControllerDelegate <NSObject>

/*!
* @param tabBarController The tab bar controller containing viewController.
* @param control Selected UIControl in TabBar.
* @attention If PlusButton also add an action, then this delegate method will not be invoked when the PlusButton is selected.
*/
- (void)tabBarController:(UITabBarController *)tabBarController didSelectControl:(UIControl *)control;

@end

//UITabBarController.h
@protocol UITabBarControllerDelegate <NSObject>
@optional
- (BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController NS_AVAILABLE_IOS(3_0);
@end

- (BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController {
   [[self cyl_tabBarController] updateSelectionStatusIfNeededForTabBarController:tabBarController shouldSelectViewController:viewController];
   return YES;
}

@interface AppDelegate ()<UITabBarControllerDelegate, CYLTabBarControllerDelegate>

@end

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
   //...
       tabBarControllerConfig.tabBarController.delegate = self;
   //...
   return YES;
}

//CYLTabBarController.h

@protocol CYLTabBarControllerDelegate <NSObject>

/*!
* @param tabBarController The tab bar controller containing viewController.
* @param control Selected UIControl in TabBar.
*/
- (void)tabBarController:(UITabBarController *)tabBarController didSelectControl:(UIControl *)control;

@end

@interface AppDelegate ()<UITabBarControllerDelegate, CYLTabBarControllerDelegate>

@end

//AppDelegate.m
- (void)tabBarController:(UITabBarController *)tabBarController didSelectControl:(UIControl *)control {
   UIView *animationView;
   // 如果 PlusButton 也添加了点击事件，那么点击 PlusButton 后不会触发该代理方法。
   if ([control isKindOfClass:[CYLExternPlusButton class]]) {
       UIButton *button = CYLExternPlusButton;
       animationView = button.imageView;
   } else if ([control isKindOfClass:NSClassFromString(@"UITabBarButton")]) {
       for (UIView *subView in control.subviews) {
           if ([subView isKindOfClass:NSClassFromString(@"UITabBarSwappableImageView")]) {
               animationView = subView;
           }
       }
   }
   
   if ([self cyl_tabBarController].selectedIndex % 2 == 0) {
       [self addScaleAnimationOnView:animationView];
   } else {
       [self addRotateAnimationOnView:animationView];
   }
}

//缩放动画
- (void)addScaleAnimationOnView:(UIView *)animationView {
   //需要实现的帧动画，这里根据需求自定义
   CAKeyframeAnimation *animation = [CAKeyframeAnimation animation];
   animation.keyPath = @"transform.scale";
   animation.values = @[@1.0,@1.3,@0.9,@1.15,@0.95,@1.02,@1.0];
   animation.duration = 1;
   animation.calculationMode = kCAAnimationCubic;
   [animationView.layer addAnimation:animation forKey:nil];
}

//旋转动画
- (void)addRotateAnimationOnView:(UIView *)animationView {
   [UIView animateWithDuration:0.32 delay:0 options:UIViewAnimationOptionCurveEaseIn animations:^{
       animationView.layer.transform = CATransform3DMakeRotation(M_PI, 0, 1, 0);
   } completion:nil];
   
   dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
       [UIView animateWithDuration:0.70 delay:0 usingSpringWithDamping:1 initialSpringVelocity:0.2 options:UIViewAnimationOptionCurveEaseOut animations:^{
           animationView.layer.transform = CATransform3DMakeRotation(2 * M_PI, 0, 1, 0);
       } completion:nil];
   });
}

- (void)updateTabBarCustomizationWhenTabBarItemWidthDidUpdate {
   void (^deviceOrientationDidChangeBlock)(NSNotification *) = ^(NSNotification *notification) {
       [self tabBarItemWidthDidUpdate];
};
   [[NSNotificationCenter defaultCenter] addObserverForName:CYLTabBarItemWidthDidChangeNotification
                                                     object:nil
                                                      queue:[NSOperationQueue mainQueue]
                                                 usingBlock:deviceOrientationDidChangeBlock];
}

- (void)tabBarItemWidthDidUpdate {
   UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation];
   if ((orientation == UIDeviceOrientationLandscapeLeft) || (orientation == UIDeviceOrientationLandscapeRight)) {
       NSLog(@"Landscape Left or Right !");
   } else if (orientation == UIDeviceOrientationPortrait){
       NSLog(@"Landscape portrait!");
   }
   CGSize selectionIndicatorImageSize = CGSizeMake(CYLTabBarItemWidth, [self cyl_tabBarController].tabBar.bounds.size.height);
   [[self cyl_tabBarController].tabBar setSelectionIndicatorImage:[[self class]
                                                                   imageFromColor:[UIColor yellowColor]
                                                                   forSize:selectionIndicatorImageSize
                                                                   withCornerRadius:0]];
}

// CYLTabBarController.h

@interface NSObject (CYLTabBarController)

/**
* If `self` is kind of `UIViewController`, this method will return the nearest ancestor in the view controller hierarchy that is a tab bar controller. If `self` is not kind of `UIViewController`, it will return the `rootViewController` of the `rootWindow` as long as you have set the `CYLTabBarController` as the  `rootViewController`. Otherwise return nil. (read-only)
*/
@property (nonatomic, readonly) CYLTabBarController *cyl_tabBarController;

@end

//导入 CYLTabBarController.h
#import "CYLTabBarController.h"

- (void)viewDidLoad {
   [super viewDidLoad];
   CYLTabBarController *tabbarController = [self cyl_tabBarController];
   /*...*/
}

#pragma mark - CYLPlusButtonSubclassing

+ (UIViewController *)plusChildViewController {
   UIViewController *plusChildViewController = [[UIViewController alloc] init];
   plusChildViewController.view.backgroundColor = [UIColor redColor];
   plusChildViewController.navigationItem.title = @"PlusChildViewController";
   UIViewController *plusChildNavigationController = [[UINavigationController alloc]
                                                  initWithRootViewController:plusChildViewController];
   return plusChildNavigationController;
}

+ (NSUInteger)indexOfPlusButtonInTabBar {
   return 2;
}

+ (BOOL)shouldSelectPlusChildViewController {
   BOOL isSelected = CYLExternPlusButton.selected;
   if (isSelected) {
//        HDLLogDebug("🔴类名与方法名：%@（在第%@行），描述：%@", @(__PRETTY_FUNCTION__), @(__LINE__), @"PlusButton is selected");
   } else {
//        HDLLogDebug("🔴类名与方法名：%@（在第%@行），描述：%@", @(__PRETTY_FUNCTION__), @(__LINE__), @"PlusButton is not selected");
   }
   return YES;
}

+ (CGFloat)multiplierOfTabBarHeight:(CGFloat)tabBarHeight {
   return  0.3;
}

+ (CGFloat)constantOfPlusButtonCenterYOffsetForTabBarHeight:(CGFloat)tabBarHeight {
   return (CYL_IS_IPHONE_X ? - 6 : 4);
}

//+ (NSString *)tabBarContext {
//    return NSStringFromClass([self class]);
//}

+ (BOOL)shouldSelectPlusChildViewController;

+ (BOOL)shouldSelectPlusChildViewController {
    BOOL isSelected = CYLExternPlusButton.selected;
    if (isSelected) {
        NSLog(@"🔴类名与方法名：%@（在第%@行），描述：%@", @(__PRETTY_FUNCTION__), @(__LINE__), @"PlusButton is selected");
    } else {
        NSLog(@"🔴类名与方法名：%@（在第%@行），描述：%@", @(__PRETTY_FUNCTION__), @(__LINE__), @"PlusButton is not selected");
    }
    return YES;
}

//CYLPlusButtonSubclassing
+ (NSString *)tabBarContext;

/**
*  更多TabBar自定义设置：比如：tabBarItem 的选中和不选中文字和背景图片属性、tabbar 背景图片属性
*/
- (void)customizeTabBarAppearance:(CYLTabBarController *)tabBarController;

   self.navigationItem.title = @"同城";    //✅sets navigation bar title.The right way to set the title of the navigation
   self.tabBarItem.title = @"同城";   //❌sets tab bar title. Even the `tabBarItem.title` changed, this will be ignored in  tabbar.
   self.title = @"同城1";                  //❌sets both of these. Do not do this‼️‼️ This may cause something strange like this : http://i68.tinypic.com/282l3x4.jpg 

//#import "CYLTabBarController.h"
   [[self cyl_tabBarController] rootWindow].backgroundColor = [UIColor whiteColor];

+ (void)load {
   [super registerPlusButton];
}

- (BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController {
   [[self cyl_tabBarController] updateSelectionStatusIfNeededForTabBarController:tabBarController shouldSelectViewController:viewController];
   return YES;
}

[button sizeToFit];

button.frame = CGRectMake(0.0, 0.0, w, h);

[UIScreen mainScreen].bounds.size.width / [CYLTabBarController allItemsInTabBarCount]