- (instancetype)initWithItems:(NSArray *)items;初始化方法，items：传入选项卡的选项
- (void)setImage:(UIImage *)image forSegmentAtIndex:(NSUInteger)segment; 设置某个选项的图片
- (void)setContentOffset:(CGSize)offset forSegmentAtIndex:(NSUInteger)segment;设置选项卡内容的偏移量
@property(nonatomic) NSInteger selectedSegmentIndex;设置选中的选项卡
@property(nonatomic,retain) UIColor *tintColor;设置选项卡的主题颜色，（主要为字体，以及边框颜色）
- (void)setBackgroundImage:(UIImage *)backgroundImage forState:(UIControlState)state barMetrics:(UIBarMetrics)barMetrics 设置背景图片，对应状态，显示对应的背景图片
- (void)setTitleTextAttributes:(NSDictionary *)attributes forState:(UIControlState)state设置字体（富文本） 对应状态的字体。
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@property (strong, nonatomic) IBOutlet UISegmentedControl *segmentController;
_segmentController.tintColor = [UIColor blackColor];
// 设置UISegmentedControl选中的图片
[segContontrol setBackgroundImage:[UIImage imageNamed:@"CPArenaSegmentSelectedBG"] forState:UIControlStateSelected barMetrics:UIBarMetricsDefault];
// 正常的图片
[segContontrol setBackgroundImage:[UIImage imageNamed:@"CPArenaSegmentBG"] forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
//设置选中文字属性
NSDictionary* selectedTextAttributes = @{NSFontAttributeName:[UIFont boldSystemFontOfSize:16],NSForegroundColorAttributeName: [UIColor blackColor]};
[_segmentController setTitleTextAttributes:selectedTextAttributes forState:UIControlStateSelected];
//设置未选中文字属性
NSDictionary* unselectedTextAttributes = @{NSFontAttributeName:[UIFont boldSystemFontOfSize:12], NSForegroundColorAttributeName: [UIColor grayColor]};
[_segmentController setTitleTextAttributes:unselectedTextAttributes forState:UIControlStateNormal];