- UISegmentedControl

创建：
UISegmentedControl *segmentedC = [[UISegmentedControl alloc] initWithItems:@[@"1safgfga", @"2", @"3"]];

• 常用属性和方法

  1.分段标签的宽度随内容自适应（默认 NO:所有分段宽度一样，取最大分段宽度）

  segmentedC.apportionsSegmentWidthsByContent = YES;

  2.调整分段的宽度

  [segmentedC setWidth:100 forSegmentAtIndex:1];

  3.重设分段内容

  [segmentedC setTitle:@"xd" forSegmentAtIndex:1];

  4.重设分段图片

  [segmentedC setImage:[UIImage imageNamed:@""] forSegmentAtIndex:3];

  5.设置分段风格颜色

  segmentedC.tintColor = [UIColor redColor];
  

6.背景图片

[segmentedC setBackgroundImage:[UIImage imageNamed:@""] forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];

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,
};

7.设置分段分割线

[segmentedC setDividerImage:[UIImage imageNamed:@""] forLeftSegmentState:UIControlStateNormal rightSegmentState:UIControlStateSelected barMetrics:UIBarMetricsDefault];

8.设置分段内文字属性

[segmentedC setTitleTextAttributes:@{NSFontAttributeName:[UIFont systemFontOfSize:13]} forState:UIControlStateNormal];

9.添加一个文字新分段

[segmentedC insertSegmentWithTitle:@"gg" atIndex:0 animated:YES];

10.添加一个图片新分段

[segmentedC insertSegmentWithImage:[UIImage imageNamed:@""] atIndex:2 animated:YES];

11.移除所有分段

[segmentedC removeAllSegments];

12.移除对应的分段

[segmentedC removeSegmentAtIndex:0 animated:YES];

13.设置分段内容偏移量

[segmentedC setContentOffset:CGSizeMake(20, 40) forSegmentAtIndex:1];

14.设置分段内容偏移量

[segmentedC setContentPositionAdjustment:UIOffsetMake(100, 100) forSegmentType:UISegmentedControlSegmentLeft barMetrics:UIBarMetricsDefault];

typedef NS_ENUM(NSInteger, UISegmentedControlSegment) {
    UISegmentedControlSegmentAny = 0,  // 所有分段受影响
    UISegmentedControlSegmentLeft = 1,   // The capped, leftmost segment. Only applies when numSegments > 1.
    UISegmentedControlSegmentCenter = 2, // Any segment between the left and rightmost segments. Only applies when numSegments > 2.
    UISegmentedControlSegmentRight = 3,  // The capped,rightmost segment. Only applies when numSegments > 1.
    UISegmentedControlSegmentAlone = 4,  // The standalone segment, capped on both ends. Only applies when numSegments = 1.
};

15.是否保持选中状态（默认NO:不保持选中状态）

segmentedC.momentary = YES;

16.禁用

[segmentedC setEnabled:NO forSegmentAtIndex:0];

• 获取信息的方法

    NSString *title = [segmentedC titleForSegmentAtIndex:1];
    UIImage *image = [segmentedC imageForSegmentAtIndex:3];
    CGFloat width = [segmentedC widthForSegmentAtIndex:0];
    CGSize size = [segmentedC contentOffsetForSegmentAtIndex:1];
    BOOL isEnable = [segmentedC isEnabledForSegmentAtIndex:0];
    UIImage *bgImage = [segmentedC backgroundImageForState:UIControlStateNormal barMetrics:UIBarMetricsCompact];
    UIImage *dividerImage = [segmentedC dividerImageForLeftSegmentState:UIControlStateNormal rightSegmentState:UIControlStateSelected barMetrics:UIBarMetricsDefault];
    NSDictionary *titleAttir = [segmentedC titleTextAttributesForState:UIControlStateNormal];
    
    NSInteger selectedIndex = segmentedC.selectedSegmentIndex;
    NSInteger count = segmentedC.numberOfSegments;
    UIOffset offset = [segmentedC contentPositionAdjustmentForSegmentType:UISegmentedControlSegmentLeft barMetrics:UIBarMetricsDefault];