UISegmentedControl使用最详细的解析

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;

实例代码：

• (void)viewDidLoad {
  [super viewDidLoad];

  UISegmentedControl *segmentedControl=[[UISegmentedControl alloc]initWithItems:@[@”Add”,@”Delete”,@”Editer”,@”insert”]];

  segmentedControl.frame=CGRectMake(0, 70, 400, 40);
  segmentedControl.tintColor=[UIColor yellowColor];
  segmentedControl.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
  segmentedControl.selectedSegmentIndex = 0;
  [segmentedControl removeSegmentAtIndex:2 animated:YES];
  // [segmentedControl insertSegmentWithImage:[UIImage imageNamed:@”dropdown_loading_01”] atIndex:0 animated:YES];
  [segmentedControl insertSegmentWithTitle:@”Hello” atIndex:0 animated:YES];
  segmentedControl.segmentedControlStyle=UISegmentedControlStylePlain;
  [segmentedControl addTarget:self action:@selector(segmentEnvent:) forControlEvents:UIControlEventValueChanged];

  [self.view addSubview:segmentedControl];

}
-(void)segmentEnvent:(id)sender{
if([sender isKindOfClass:[UISegmentedControl class]]){

    UISegmentedControl *controller=(UISegmentedControl*)sender;

    NSLog(@"点击了第%zd个",[controller selectedSegmentIndex]);


}

}