SegmentedControl又被称作分段控制器
初始化方法：传入的数组可以是字符串也可以是UIImage对象的图片数组
// items can be NSStrings or UIImages. control is automatically sized to fit content
- (instancetype)initWithItems:(NSArray *)items;
设置控件风格：
@property(nonatomic) UISegmentedControlStyle segmentedControlStyle
注意：这个属性已经废弃，它的枚举如下：
//"The segmentedControlStyle property no longer has any effect") __TVOS_PROHIBITED;
typedef NS_ENUM(NSInteger, UISegmentedControlStyle) {
UISegmentedControlStylePlain, // large plain
UISegmentedControlStyleBordered, // large bordered
UISegmentedControlStyleBar, // small button/nav bar style. tintable
UISegmentedControlStyleBezeled, // DEPRECATED. Do not use this style.
} NS_DEPRECATED_IOS(2_0, 7_0,
设置是否保持选中状态：默认是NO,如果设置为YES,点击结束后将不保持选中状态.
@property(nonatomic,getter=isMomentary) BOOL momentary;
获取标签个数：(只读)
@property(nonatomic,readonly) NSUInteger numberOfSegments;
设置标签宽度是否随内容自适应：如果设置为NO，则所有标签宽度一致，为最大宽度
@property(nonatomic) BOOL apportionsSegmentWidthsByContent；
插入文字标签在index位置：
- (void)insertSegmentWithTitle:(NSString *)title atIndex:(NSUInteger)segment animated:(BOOL)animated
插入图片标签在index位置
- (void)insertSegmentWithImage:(UIImage *)image atIndex:(NSUInteger)segment animated:(BOOL)animated
根据索引删除标签
- (void)removeSegmentAtIndex:(NSUInteger)segment animated:(BOOL)animated;
删除所有标签
- (void)removeAllSegments;
重设标签标题
- (void)setTitle:(NSString *)title forSegmentAtIndex:(NSUInteger)segment;
获取标签标题
- (NSString *)titleForSegmentAtIndex:(NSUInteger)segment;
设置标签图片
- (void)setImage:(UIImage *)image forSegmentAtIndex:(NSUInteger)segment;
获取标签图片:标题的图片只能设置一个
- (UIImage *)imageForSegmentAtIndex:(NSUInteger)segment;
根据索引设置相应标签宽度:如果设置为0.0，则为自适应，默认为此设置.
- (void)setWidth:(CGFloat)width forSegmentAtIndex:(NSUInteger)segment;
根据索引获取标签宽度
- (CGFloat)widthForSegmentAtIndex:(NSUInteger)segment;
设置标签内容的偏移量:这个偏移量指的是 标签的文字或者图片
- (void)setContentOffset:(CGSize)offset forSegmentAtIndex:(NSUInteger)segment;
根据索引获取变标签内容的偏移量
- (CGSize)contentOffsetForSegmentAtIndex:(NSUInteger)segment;
根据所以设置标签是否有效(默认有效)
- (void)setEnabled:(BOOL)enabled forSegmentAtIndex:(NSUInteger)segment;
根据索引获取当前标签是否有效
- (BOOL)isEnabledForSegmentAtIndex:(NSUInteger)segment;
设置和获取当前选中的标签索引
@property(nonatomic) NSInteger selectedSegmentIndex;
设置标签风格颜色:这个风格颜色会影响标签的文字和图片,如果设置为clearColor,那么整个segmentedControl将不会有背景和边框
@property(nonatomic,retain) UIColor *tintColor;
设置特定状态下segment的背景图案 UIBarMetrics是一个枚举，如下：(defaulf风格会充满背景)
- (void)setBackgroundImage:(UIImage *)backgroundImage forState:(UIControlState)state barMetrics:(UIBarMetrics)barMetrics
```
```
typedef NS_ENUM(NSInteger, UIBarMetrics) {
UIBarMetricsDefault,
UIBarMetricsCompact,
UIBarMetricsDefaultPrompt = 101, // Applicable only in bars with the prompt property, such as UINavigationBar and UISearchBar
UIBarMetricsCompactPrompt,
UIBarMetricsLandscapePhone NS_ENUM_DEPRECATED_IOS(5_0, 8_0, "Use UIBarMetricsCompact instead") = UIBarMetricsCompact,
UIBarMetricsLandscapePhonePrompt NS_ENUM_DEPRECATED_IOS(7_0, 8_0, "Use UIBarMetricsCompactPrompt") = UIBarMetricsCompactPrompt,
};
```
获取背景图案
```
- (UIImage *)backgroundImageForState:(UIControlState)state barMetrics:(UIBarMetrics)barMetrics
```
设置标签之间分割线的图案
```
- (void)setDividerImage:(UIImage *)dividerImage forLeftSegmentState:(UIControlState)leftState rightSegmentState:(UIControlState)rightState barMetrics:(UIBarMetrics)barMetrics
```
获取标签之间分割线的图案
```
- (UIImage *)dividerImageForLeftSegmentState:(UIControlState)leftState rightSegmentState:(UIControlState)rightState barMetrics:(UIBarMetrics)barMetrics
```
通过Attribute字符串属性字典设置标签标题
```
- (void)setTitleTextAttributes:(NSDictionary *)attributes forState:(UIControlState)state
```
获取Attribute字符串属性字典
```
- (NSDictionary *)titleTextAttributesForState:(UIControlState)state
```
自行设置标签内容的偏移量
```
- (void)setContentPositionAdjustment:(UIOffset)adjustment forSegmentType:(UISegmentedControlSegment)leftCenterRightOrAlone barMetrics:(UIBarMetrics)barMetrics
```
注意：UIOffset为偏移量，这个结构体中有两个浮点数，分别表示水平量和竖直量；UISegmentedControlSegment类型参数是一个枚举，如下：
```objc
typedef NS_ENUM(NSInteger, UISegmentedControlSegment) {
UISegmentedControlSegmentAny = 0,//所有标签都受影响
UISegmentedControlSegmentLeft = 1, //只有左边部分受到影响 The capped, leftmost segment. Only applies when numSegments > 1.
UISegmentedControlSegmentCenter = 2, // 只有中间部分受到影响Any segment between the left and rightmost segments. Only applies when numSegments > 2.
UISegmentedControlSegmentRight = 3, //只有右边部分受到影响 The capped,rightmost segment. Only applies when numSegments > 1.
UISegmentedControlSegmentAlone = 4, //在只有一个标签的时候生效 The standalone segment, capped on both ends. Only applies when numSegments = 1.
};
```
添加点击事件:这里的时间是valueChanged
```
[segmentedControl addTarget:self action:@selector(sementedControlClick:) forControlEvents:UIControlEventValueChanged];
```
用segmentedControl和一个UIView简单封装一个选择控制器,作为导航控制器的titleView
去掉背景之后
```
#import "GZDFriendTrendTitleView.h"
@interface GZDFriendTrendTitleView()
@property (weak, nonatomic) IBOutlet UISegmentedControl *segmentedControl;
//底部线
@property (weak, nonatomic) IBOutlet UIView *bottomView;
@end
@implementation GZDFriendTrendTitleView
//初始化方法
+ (instancetype)friendTrendTitleView {
return [[[NSBundle mainBundle] loadNibNamed:NSStringFromClass(self) owner:nil options:nil] lastObject];
}
//一次性设置
- (void)awakeFromNib {
[self.segmentedControl setTitle:@"关注" forSegmentAtIndex:0];
[self.segmentedControl setTitle:@"订阅" forSegmentAtIndex:1];
//设置普通状态下(未选中)状态下的文字颜色和字体
[self.segmentedControl setTitleTextAttributes:@{NSFontAttributeName:[UIFont systemFontOfSize:12],NSForegroundColorAttributeName: [UIColor blackColor]} forState:UIControlStateNormal];
//设置选中状态下的文字颜色和字体
[self.segmentedControl setTitleTextAttributes:@{NSFontAttributeName:[UIFont systemFontOfSize:16],NSForegroundColorAttributeName: [UIColor blackColor]} forState:UIControlStateSelected];
//添加监听
[self.segmentedControl addTarget:self action:@selector(sementedControlClick) forControlEvents:UIControlEventValueChanged];
}
//监听方法
- (void)sementedControlClick{
//修改底部线的frame值产生动画
[UIView animateWithDuration:0.25 animations:^{
self.bottomView.centerX = (self.segmentedControl.selectedSegmentIndex == 0)? self.segmentedControl.centerX * 0.5 : self.segmentedControl.centerX * 1.5;
}];
}
```