iOS控件之UISegmentedControl

• 创建

UISegmentedControl * segmentedControl = [[UISegmentedControl alloc] init];
UISegmentedControl * segmentedControl = [[UISegmentedControl alloc] initWithFrame:CGRectMake(20, 50, 300, 30)];
UISegmentedControl * segmentedControl = [[UISegmentedControl alloc] initWithItems:@[@"选项一",@"选项二",@"选项三"]];

• 增、删选项

// 以标题的方式插入一个选项，动画可选
-(void)insertSegmentWithTitle:(nullable NSString *)title atIndex:(NSUInteger)segment animated:(BOOL)animated;
// 以图片的方式插入一个选项，动画可选
-(void)insertSegmentWithImage:(nullable UIImage *)image  atIndex:(NSUInteger)segment animated:(BOOL)animated;
// 删除序号所在选项，动画可选
-(void)removeSegmentAtIndex:(NSUInteger)segment animated:(BOOL)animated;
// 删除所有选项
-(void)removeAllSegments;

[segmentedControl insertSegmentWithTitle:@"选项四" atIndex:3 animated:YES];

• 获取选项个数 (只读)

segmentedControl.numberOfSegments;

• 样式

⚠️ 该属性已弃用，就不详细说了
segmentedControl.segmentedControlStyle;

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, "The segmentedControlStyle property no longer has any effect") __TVOS_PROHIBITED;

• 设置元素的色调

segmentedControl.tintColor = [UIColor redColor];

• 背景图片

// 设置背景图
-(void)setBackgroundImage:(nullable UIImage *)backgroundImage forState:(UIControlState)state barMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR; 
// 获取背景图
-(nullable UIImage *)backgroundImageForState:(UIControlState)state barMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;

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

原图

• 通过序号设置被选中的选项

segmentedControl.selectedSegmentIndex = 1;

• 是否有选中的状态

segmentedControl.momentary = YES; // 默认为NO

点击过后不保留选中的深色状态

• 选项是否可用

// 设置序号所在选项是否可用
-(void)setEnabled:(BOOL)enabled forSegmentAtIndex:(NSUInteger)segment;
// 获取序号所在选项是否可用
-(BOOL)isEnabledForSegmentAtIndex:(NSUInteger)segment;

• 选项宽度

// 设置序号所在选项宽度
-(void)setWidth:(CGFloat)width forSegmentAtIndex:(NSUInteger)segment;
// 获取序号所在选项宽度
-(CGFloat)widthForSegmentAtIndex:(NSUInteger)segment;

• 是否根据选项中的内容自适应选项宽度

segmentedControl.apportionsSegmentWidthsByContent = YES; // 默认为NO

默认设置时
设置为YES后

• 选项标题

// 向序号所在选项设置标题
// 与图片的设置操作互斥
-(void)setTitle:(nullable NSString *)title forSegmentAtIndex:(NSUInteger)segment;
// 获取序号所在选项标题
-(nullable NSString *)titleForSegmentAtIndex:(NSUInteger)segment;

• 选项图片

// 向序号所在选项设置图片
// 与标题的设置操作互斥
-(void)setImage:(nullable UIImage *)image forSegmentAtIndex:(NSUInteger)segment;
// 获取序号所在选项图片
-(nullable UIImage *)imageForSegmentAtIndex:(NSUInteger)segment;

⚠️ 注意：这里有个小问题就是，系统会自动将我们设置的图片格式化成系统的风格

原图
设置到选项中的图片效果

• 选项标题富文本属性

// 根据ControlState状态设置选项标题的富文本属性
-(void)setTitleTextAttributes:(nullable NSDictionary *)attributes forState:(UIControlState)state NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;
// 获取选项标题的富文本属性
-(nullable NSDictionary *)titleTextAttributesForState:(UIControlState)state NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;

• 选项间分割线图片

// 根据左选中右正常、左正常右选中、左正常右正常等状态以及UIBarMetrics状态设置分割线图片
-(void)setDividerImage:(nullable UIImage *)dividerImage forLeftSegmentState:(UIControlState)leftState rightSegmentState:(UIControlState)rightState barMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;
// 获取分割线图片
-(nullable UIImage *)dividerImageForLeftSegmentState:(UIControlState)leftState rightSegmentState:(UIControlState)rightState barMetrics:(UIBarMetrics)barMetrics  NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;

• 选项内容偏移量

// 设置序号所在选项的内容偏移量
-(void)setContentOffset:(CGSize)offset forSegmentAtIndex:(NSUInteger)segment;
// 获取序号所在选项的内容偏移量
-(CGSize)contentOffsetForSegmentAtIndex:(NSUInteger)segment;

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

• 各状态下选项内容的偏移量

// 设置不同状态下选项内容的偏移量
-(void)setContentPositionAdjustment:(UIOffset)adjustment forSegmentType:(UISegmentedControlSegment)leftCenterRightOrAlone barMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR; 
// 获取不同状态下选项内容的偏移量
-(UIOffset)contentPositionAdjustmentForSegmentType:(UISegmentedControlSegment)leftCenterRightOrAlone barMetrics:(UIBarMetrics)barMetrics NS_AVAILABLE_IOS(5_0) UI_APPEARANCE_SELECTOR;

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