初始化的方法

 //一次性初始化多个control，items可以是图片或者是文字array，系统会自动控制每个单元的大小
 //也可通过正常View的初始化进行
 - (instancetype)initWithItems:(NSArray *)items; 

事件添加

 //通过UIControl的方法来设置，当改变segments的时候通过事件UIControlEventValueChanged，
 //通过action来处理事件
 [self.mySegmentedControl addTarget:self
                     action:@selector(myAction:)
           forControlEvents:UIControlEventValueChanged];

Segmented Controls的内容设置

 //通过索引设置以及获取Title和Image          
 - (void)setTitle:(NSString *)title forSegmentAtIndex:(NSUInteger)segment;
 - (NSString *)titleForSegmentAtIndex:(NSUInteger)segment;
 - (void)setImage:(UIImage *)image forSegmentAtIndex:(NSUInteger)segment;
 - (UIImage *)imageForSegmentAtIndex:(NSUInteger)segment;

Segmented Controls Segments的设置

 //在索引点插入一个新的标题的segment
 - (void)insertSegmentWithTitle:(NSString *)title atIndex:(NSUInteger)segment animated:(BOOL)animated;
 //在索引点插入一个新的图片的segment
 - (void)insertSegmentWithImage:(UIImage *)image  atIndex:(NSUInteger)segment animated:(BOOL)animated;
 - (void)removeSegmentAtIndex:(NSUInteger)segment animated:(BOOL)animated;
 - (void)removeAllSegmens;
 //Segment的数量
 @property(nonatomic,readonly) NSUInteger numberOfSegments;  
 //被选中的索引
 @property(nonatomic) NSInteger selectedSegmentIndex;

Segmented Controls显示和行为设置

 //默认值为NO，即点击后保持选中状态，如果设置为YES则，只是短暂的显示选中状态
 @property(nonatomic,getter=isMomentary) BOOL momentary;
 //通过索引调整每个segment的width，如果设置为0.0则表示自动调整大小，默认为0.0
 - (void)setWidth:(CGFloat)width forSegmentAtIndex:(NSUInteger)segment;
 - (CGFloat)widthForSegmentAtIndex:(NSUInteger)segment;
 //通过索引调整文字或者图片在segment的offset，默认为（0,0）
 - (void)setContentOffset:(CGSize)offset forSegmentAtIndex:(NSUInteger)segment;
 - (CGSize)contentOffsetForSegmentAtIndex:(NSUInteger)segment;
 //设置segment是否能选中
 - (void)setEnabled:(BOOL)enabled forSegmentAtIndex:(NSUInteger)segment;       
 - (BOOL)isEnabledForSegmentAtIndex:(NSUInteger)segment;
 //是否根据内容的大小自动调整宽度
 @property(nonatomic) BOOL apportionsSegmentWidthsByContent NS_AVAILABLE_IOS(5_0);

自定义的外观

 //设置UISegmentedControl的边框，分隔线，文字，点击后的颜色
 @property(nonatomic,retain) UIColor *tintColor;
 //获取和设置背景图片，通过UIControlState和barMetrics的进行设置和获取，主要需要先设置
 //UIControlStateNormal才会有效果
 - (UIImage *)backgroundImageForState:(UIControlState)state barMetrics:(UIBarMetrics)barMetrics
 - (void)setBackgroundImage:(UIImage *)backgroundImage forState:(UIControlState)state barMetrics:(UIBarMetrics)barMetrics
 //设置分割线的图片样式，首先需要设置UIControlStateNormal不管左边还是右边，
 //设置完成后再调用设置方法，根据UIControlState显示分割线
 - (void)setDividerImage:(UIImage *)dividerImage forLeftSegmentState:(UIControlState)leftState rightSegmentState:(UIControlState)rightState barMetrics:(UIBarMetrics)barMetrics
 - (UIImage *)dividerImageForLeftSegmentState:(UIControlState)leftState rightSegmentState:(UIControlState)rightState barMetrics:(UIBarMetrics)barMetric      //设置Title的样式，包括 font, text color,  shadow。通过NSAttributedString.h里面的键值对
 - (void)setTitleTextAttributes:(NSDictionary *)attributes forState:(UIControlState)state NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;
 - (NSDictionary *)titleTextAttributesForState:(UIControlState)state NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;
 //调整title和image的位置，通过给定的segment 
 - (void)setContentPositionAdjustment:(UIOffset)adjustment forSegmentType:(UISegmentedControlSegment)leftCenterRightOrAlone barMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR; 
 - (UIOffset)contentPositionAdjustmentForSegmentType:(UISegmentedControlSegment)leftCenterRightOrAlone barMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;