设计标签选择器TitleSwitch

效果如下:

源码如下:

TitleSwitch.h 与 TitleSwitch.m

////  TitleSwitch.h//  TitleSwitch////  Created by YouXianMing on 14/11/4.//  Copyright (c) 2014年 YouXianMing. All rights reserved.//#import 
    
     @protocol TitleSwitchDelegate 
     
      @optional- (void)willSelectIndex:(NSInteger)index;- (void)didSelectIndex:(NSInteger)index;@end@interface TitleSwitch : UIView/** *  协议 */@property (nonatomic, assign) id
      
        delegate;/** *  作为按钮的标题 */@property (nonatomic, strong) NSArray  *titles;/** *  线的宽度 */@property (nonatomic, assign) CGFloat   lineWidth;/** *  线的颜色 */@property (nonatomic, strong) UIColor  *lineColor;/** *  标题字体 */@property (nonatomic, strong) UIFont   *titleFont;/** *  普通标题颜色 */@property (nonatomic, strong) UIColor  *normalTitleColor;/** *  选中标题的颜色 */@property (nonatomic, strong) UIColor  *selectedTitleColor;/** *  一次只能按一个按钮触发动画效果 */@property (nonatomic, assign) BOOL      canTouchOnlyButtonOneTime;/** *  开启按钮点击时高亮颜色的效果 & 高亮颜色 */@property (nonatomic, assign) BOOL      enableButtonTitleHighlighted;@property (nonatomic, strong) UIColor  *highlightedTitleColor;/** *  创建TitleSwitch的view出来 */- (void)createTitleSwitchView;@end
      
     
    

////  TitleSwitch.m//  TitleSwitch////  Created by YouXianMing on 14/11/4.//  Copyright (c) 2014年 YouXianMing. All rights reserved.//#import "TitleSwitch.h"typedef enum : NSUInteger {    NORMAL_BUTTON = 0x11,        LINE_VIEW = 0x1122,} ENUM_VIEWTAG;@implementation TitleSwitch- (void)createTitleSwitchView {        // 如果没有title,则直接返回    if (_titles.count == 0) {        return;    }        // 获取尺寸    CGFloat frameWidth  = self.bounds.size.width;    CGFloat frameHeight = self.bounds.size.height;        // 计算按钮的宽度&高度    CGFloat buttonWidth      = frameWidth / _titles.count;    CGFloat buttonHeight     = 0;    CGFloat defaultLineWidth = 2.f;    if (_lineWidth == 0) {        buttonHeight = frameHeight - defaultLineWidth; // 默认线条占用一个像素    } else {        buttonHeight = frameHeight - _lineWidth;    }        // 初始化所有按钮    for (int i = 0; i < _titles.count; i++) {        UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(buttonWidth * i,                                                                      0,                                                                      buttonWidth,                                                                      buttonHeight)];        button.tag       = NORMAL_BUTTON + i;        [self addSubview:button];                [button setTitle:_titles[i] forState:UIControlStateNormal];                // 普通颜色        if (i == 0) {            [self selectButtonStyle:button];        } else {            [self normalButtonStyle:button];        }                // 高亮颜色        if (_enableButtonTitleHighlighted == YES && _highlightedTitleColor) {            [button setTitleColor:_highlightedTitleColor forState:UIControlStateHighlighted];        }        // 添加事件        [button addTarget:self action:@selector(buttonsEvent:) forControlEvents:UIControlEventTouchUpInside];                // 设置字体        if (_titleFont) {            button.titleLabel.font = _titleFont;        }    }        // 初始化横线view    UIView *lineView = [[UIView alloc] initWithFrame:CGRectMake(0, buttonHeight, buttonWidth,                                                                (_lineWidth == 0 ? defaultLineWidth : _lineWidth))];    lineView.tag     = LINE_VIEW;    [self addSubview:lineView];    if (_lineColor) {        lineView.backgroundColor = _lineColor;    } else {        lineView.backgroundColor = [UIColor redColor];    }}/** *  按钮事件 * *  @param button 触摸事件中的按钮 */- (void)buttonsEvent:(UIButton *)button {    // 获取到lineView    UIView *lineView      = [self viewWithTag:LINE_VIEW];        // 哪一个button    NSInteger whichButton = button.tag - NORMAL_BUTTON;        // 计算按钮的宽度&高度    CGFloat frameWidth    = self.bounds.size.width;    CGFloat buttonWidth   = frameWidth / _titles.count;            [[self subviews] enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {        UIButton *tmp = (UIButton *)obj;        if ([tmp isKindOfClass:[UIButton class]]) {            if (tmp == button) {                [self selectButtonStyle:tmp];            } else {                [self normalButtonStyle:tmp];            }        }    }];            // 做动画    if (_canTouchOnlyButtonOneTime == YES) {        self.userInteractionEnabled = NO;    }        if (_delegate && [_delegate respondsToSelector:@selector(willSelectIndex:)]) {        [_delegate willSelectIndex:whichButton];    }        [UIView animateWithDuration:0.25f animations:^{        CGRect rect    = lineView.frame;        rect.origin.x  = whichButton * buttonWidth;        lineView.frame = rect;    } completion:^(BOOL finished) {        if (_canTouchOnlyButtonOneTime == YES) {            self.userInteractionEnabled = YES;        }                if (_delegate && [_delegate respondsToSelector:@selector(didSelectIndex:)]) {            [_delegate didSelectIndex:whichButton];        }    }];}/** *  选中按钮的样式 * *  @param button 按钮 */- (void)selectButtonStyle:(UIButton *)button {        if (_normalTitleColor) {        [button setTitleColor:_normalTitleColor                     forState:UIControlStateNormal];    } else {        [button setTitleColor:[UIColor redColor]                     forState:UIControlStateNormal];    }}/** *  普通按钮样式 * *  @param button 按钮 */- (void)normalButtonStyle:(UIButton *)button {        if (_selectedTitleColor) {        [button setTitleColor:_selectedTitleColor                     forState:UIControlStateNormal];    } else {        [button setTitleColor:[UIColor colorWithRed:0.369 green:0.369 blue:0.369 alpha:1]                     forState:UIControlStateNormal];    }}@end

////  ViewController.m//  TitleSwitch////  Created by YouXianMing on 14/11/4.//  Copyright (c) 2014年 YouXianMing. All rights reserved.//#import "ViewController.h"#import "TitleSwitch.h"@interface ViewController ()
    
     @end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];     TitleSwitch *titleSwitch              = [[TitleSwitch alloc] initWithFrame:CGRectMake(0, 100, 320, 40)];    titleSwitch.titles                    = @[@"YouXianMing", @"NoZuoNoDie", @"BlueShit"];    titleSwitch.titleFont                 = [UIFont systemFontOfSize:15.f];    titleSwitch.lineWidth                 = 1.f;    titleSwitch.canTouchOnlyButtonOneTime = YES;    titleSwitch.delegate                  = self;    [titleSwitch createTitleSwitchView];        [self.view addSubview:titleSwitch];}- (void)willSelectIndex:(NSInteger)index {    NSLog(@"willSelectIndex %ld", (long)index);}- (void)didSelectIndex:(NSInteger)index {    NSLog(@"didSelectIndex %ld", (long)index);}@end
    

注意细节: