基类三：UITabBarItem

一、简述

继承关系：UITabBarItem-->UIBarItem-->NSObject

二、属性

tabBarItem图标样式

typedef NS_ENUM(NSInteger, UITabBarSystemItem) {
     UITabBarSystemItemMore,//更多图标
     UITabBarSystemItemFavorites,//最爱图标
     UITabBarSystemItemFeatured,//特征图标
     UITabBarSystemItemTopRated,//高级图标
     UITabBarSystemItemRecents,//最近图标
     UITabBarSystemItemContacts,//联系人图标
     UITabBarSystemItemHistory,//历史图标
     UITabBarSystemItemBookmarks,//图书图标
     UITabBarSystemItemSearch,//查找图标
     UITabBarSystemItemDownloads,//下载图标
     UITabBarSystemItemMostRecent,//记录图标
     UITabBarSystemItemMostViewed,//全部查看图标
};

选中图片

@property(nullable, nonatomic,strong) UIImage *selectedImage NS_AVAILABLE_IOS(7_0);

角标提示，小红点

@property(nullable, nonatomic, copy) NSString *badgeValue;

文字标签的相对位置

@property (nonatomic, readwrite, assign) UIOffset titlePositionAdjustment NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;

角标颜色

@property (nonatomic, readwrite, copy, nullable) UIColor *badgeColor NS_AVAILABLE_IOS(10_0) UI_APPEARANCE_SELECTOR;

 

三、初始化方法：

- (instancetype)init NS_DESIGNATED_INITIALIZER;
//xib
- (nullable instancetype)initWithCoder:(NSCoder *)aDecoder NS_DESIGNATED_INITIALIZER;
- (instancetype)initWithTitle:(nullable NSString *)title image:(nullable UIImage *)image tag:(NSInteger)tag;
- (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;

set方法

- (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") __TVOS_PROHIBITED;
- (nullable UIImage *)finishedSelectedImage NS_DEPRECATED_IOS(5_0,7_0) __TVOS_PROHIBITED;
- (nullable UIImage *)finishedUnselectedImage NS_DEPRECATED_IOS(5_0,7_0) __TVOS_PROHIBITED;

//角标
- (void)setBadgeTextAttributes:(nullable NSDictionary *)textAttributes forState:(UIControlState)state NS_AVAILABLE_IOS(10_0) UI_APPEARANCE_SELECTOR;
//返回设置的角标属性
- (nullable NSDictionary *)badgeTextAttributesForState:(UIControlState)state NS_AVAILABLE_IOS(10_0) UI_APPEARANCE_SELECTOR;