SegmentedControl又被稱作分段控制器
初始化方法：傳入的數組可以是字符串也可以是UIImage對象的圖片數組
// items can be NSStrings or UIImages. control is automatically sized to fit content
- (instancetype)initWithItems:(NSArray *)items;
設置控件風格：
@property(nonatomic) UISegmentedControlStyle segmentedControlStyle
注意：這個屬性已經廢棄，它的枚舉如下：
//"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,
設置是否保持選中狀態：默認是NO,如果設置為YES,點擊結束后將不保持選中狀態.
@property(nonatomic,getter=isMomentary) BOOL momentary;
獲取標簽個數：(只讀)
@property(nonatomic,readonly) NSUInteger numberOfSegments;
設置標簽寬度是否隨內容自適應：如果設置為NO，則所有標簽寬度一致，為最大寬度
@property(nonatomic) BOOL apportionsSegmentWidthsByContent；
插入文字標簽在index位置：
- (void)insertSegmentWithTitle:(NSString *)title atIndex:(NSUInteger)segment animated:(BOOL)animated
插入圖片標簽在index位置
- (void)insertSegmentWithImage:(UIImage *)image atIndex:(NSUInteger)segment animated:(BOOL)animated
根據索引刪除標簽
- (void)removeSegmentAtIndex:(NSUInteger)segment animated:(BOOL)animated;
刪除所有標簽
- (void)removeAllSegments;
重設標簽標題
- (void)setTitle:(NSString *)title forSegmentAtIndex:(NSUInteger)segment;
獲取標簽標題
- (NSString *)titleForSegmentAtIndex:(NSUInteger)segment;
設置標簽圖片
- (void)setImage:(UIImage *)image forSegmentAtIndex:(NSUInteger)segment;
獲取標簽圖片:標題的圖片只能設置一個
- (UIImage *)imageForSegmentAtIndex:(NSUInteger)segment;
根據索引設置相應標簽寬度:如果設置為0.0，則為自適應，默認為此設置.
- (void)setWidth:(CGFloat)width forSegmentAtIndex:(NSUInteger)segment;
根據索引獲取標簽寬度
- (CGFloat)widthForSegmentAtIndex:(NSUInteger)segment;
設置標簽內容的偏移量:這個偏移量指的是 標簽的文字或者圖片
- (void)setContentOffset:(CGSize)offset forSegmentAtIndex:(NSUInteger)segment;
根據索引獲取變標簽內容的偏移量
- (CGSize)contentOffsetForSegmentAtIndex:(NSUInteger)segment;
根據所以設置標簽是否有效(默認有效)
- (void)setEnabled:(BOOL)enabled forSegmentAtIndex:(NSUInteger)segment;
根據索引獲取當前標簽是否有效
- (BOOL)isEnabledForSegmentAtIndex:(NSUInteger)segment;
設置和獲取當前選中的標簽索引
@property(nonatomic) NSInteger selectedSegmentIndex;
設置標簽風格顏色:這個風格顏色會影響標簽的文字和圖片,如果設置為clearColor,那么整個segmentedControl將不會有背景和邊框
@property(nonatomic,retain) UIColor *tintColor;
設置特定狀態下segment的背景圖案 UIBarMetrics是一個枚舉，如下：(defaulf風格會充滿背景)
- (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,
};
```
獲取背景圖案
```
- (UIImage *)backgroundImageForState:(UIControlState)state barMetrics:(UIBarMetrics)barMetrics
```
設置標簽之間分割線的圖案
```
- (void)setDividerImage:(UIImage *)dividerImage forLeftSegmentState:(UIControlState)leftState rightSegmentState:(UIControlState)rightState barMetrics:(UIBarMetrics)barMetrics
```
獲取標簽之間分割線的圖案
```
- (UIImage *)dividerImageForLeftSegmentState:(UIControlState)leftState rightSegmentState:(UIControlState)rightState barMetrics:(UIBarMetrics)barMetrics
```
通過Attribute字符串屬性字典設置標簽標題
```
- (void)setTitleTextAttributes:(NSDictionary *)attributes forState:(UIControlState)state
```
獲取Attribute字符串屬性字典
```
- (NSDictionary *)titleTextAttributesForState:(UIControlState)state
```
自行設置標簽內容的偏移量
```
- (void)setContentPositionAdjustment:(UIOffset)adjustment forSegmentType:(UISegmentedControlSegment)leftCenterRightOrAlone barMetrics:(UIBarMetrics)barMetrics
```
注意：UIOffset為偏移量，這個結構體中有兩個浮點數，分別表示水平量和豎直量；UISegmentedControlSegment類型參數是一個枚舉，如下：
```objc
typedef NS_ENUM(NSInteger, UISegmentedControlSegment) {
UISegmentedControlSegmentAny = 0,//所有標簽都受影響
UISegmentedControlSegmentLeft = 1, //只有左邊部分受到影響 The capped, leftmost segment. Only applies when numSegments > 1.
UISegmentedControlSegmentCenter = 2, // 只有中間部分受到影響Any segment between the left and rightmost segments. Only applies when numSegments > 2.
UISegmentedControlSegmentRight = 3, //只有右邊部分受到影響 The capped,rightmost segment. Only applies when numSegments > 1.
UISegmentedControlSegmentAlone = 4, //在只有一個標簽的時候生效 The standalone segment, capped on both ends. Only applies when numSegments = 1.
};
```
添加點擊事件:這里的時間是valueChanged
```
[segmentedControl addTarget:self action:@selector(sementedControlClick:) forControlEvents:UIControlEventValueChanged];
```
用segmentedControl和一個UIView簡單封裝一個選擇控制器,作為導航控制器的titleView
去掉背景之后
```
#import "GZDFriendTrendTitleView.h"
@interface GZDFriendTrendTitleView()
@property (weak, nonatomic) IBOutlet UISegmentedControl *segmentedControl;
//底部線
@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];
}
//一次性設置
- (void)awakeFromNib {
[self.segmentedControl setTitle:@"關注" forSegmentAtIndex:0];
[self.segmentedControl setTitle:@"訂閱" forSegmentAtIndex:1];
//設置普通狀態下(未選中)狀態下的文字顏色和字體
[self.segmentedControl setTitleTextAttributes:@{NSFontAttributeName:[UIFont systemFontOfSize:12],NSForegroundColorAttributeName: [UIColor blackColor]} forState:UIControlStateNormal];
//設置選中狀態下的文字顏色和字體
[self.segmentedControl setTitleTextAttributes:@{NSFontAttributeName:[UIFont systemFontOfSize:16],NSForegroundColorAttributeName: [UIColor blackColor]} forState:UIControlStateSelected];
//添加監聽
[self.segmentedControl addTarget:self action:@selector(sementedControlClick) forControlEvents:UIControlEventValueChanged];
}
//監聽方法
- (void)sementedControlClick{
//修改底部線的frame值產生動畫
[UIView animateWithDuration:0.25 animations:^{
self.bottomView.centerX = (self.segmentedControl.selectedSegmentIndex == 0)? self.segmentedControl.centerX * 0.5 : self.segmentedControl.centerX * 1.5;
}];
}
```