#import <UIKit/UIKit.h>

@interface GMSubfieldViiew : UIView

/**
?* select index
?*/
@property(nonatomic,copy) void(^clickIndex)(NSInteger index);

- (instancetype)initWithFrame:(CGRect)frame titles:(NSArray *)thiTitles;

/**
?* ?默認(rèn)勾選
?*/
@property(nonatomic,assign) NSInteger selectedIndex;

@end

GMSubfieldViiew.m

#import "GMSubfieldViiew.h"

#define lineH 2
@interface GMSubfieldViiew ()
/**
?* ?titles
?*/
@property(nonatomic,strong) NSArray * titles;
/**
?* ?lineView
?*/
@property(nonatomic,weak) UIView *lineView;
/**
?* ?itemWidth
?*/
@property(nonatomic,assign) CGFloat itemWidth;
@end

@implementation GMSubfieldViiew


#pragma mark - initUI
- (instancetype)initWithFrame:(CGRect)frame titles:(NSArray *)thiTitles
{
? ? if (self = [super initWithFrame:frame]) {
? ? ? ? self.titles = thiTitles;
? ? ? ? //initSubViews
? ? ? ? [self initSubViews];
? ? }
? ? return self;
}

#pragma mark - action
- (void) initSubViews
{
? ? self.itemWidth = kScreen_Width/self.titles.count;
? ? //add child
? ? for (int i=0; i<self.titles.count; i++) {
? ? ? ? UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
? ? ? ? [btn setTitle:self.titles[i] forState:UIControlStateNormal];
? ? ? ? btn.titleLabel.font = FontSize(15);
? ? ? ? btn.tag ?= 100+i;
? ? ? ? btn.layer.borderWidth = 0.5;
? ? ? ? [btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
? ? ? ? btn.layer.borderColor = [UIColor lightGrayColor].CGColor;
? ? ? ? [btn addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];
? ? ? ? [self addSubview:btn];
? ? }

? ? //添加下劃線
? ? UIView *lineView ?= [[UIView alloc]init];
? ? lineView.backgroundColor = [UIColor blackColor];
? ? [self addSubview:lineView];
? ? self.lineView ? ? = lineView;
}

- (void)layoutSubviews
{
? ? [super layoutSubviews];

? ? for (int i=0; i<self.titles.count; i++) {
? ? ? ? UIButton *btn = [self viewWithTag:100+i];
? ? ? ? btn.frame = CGRectMake(i*self.itemWidth, 0, self.itemWidth, self.bounds.size.height-lineH+1);
? ? }
? ? self.lineView.frame = CGRectMake(self.selectedIndex*self.itemWidth, self.bounds.size.height-lineH, self.itemWidth, lineH);
}


- (void) btnClick:(UIButton *)btn
{
? ? NSInteger index = btn.tag -100;
? ? ESWeakSelf
? ? [UIView animateWithDuration:0.2 animations:^{
? ? ? ? ESStrongSelf
? ? ? ? self.lineView.frame = CGRectMake(index*self.itemWidth, self.bounds.size.height-lineH, self.itemWidth, lineH);
? ? }];
? ? if (self.clickIndex) {
? ? ? ? self.clickIndex(index);
? ? }
}

/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
? ? // Drawing code
}
*/

@end

調(diào)用：

GMSubfieldViiew *segView = [[GMSubfieldViiew alloc]initWithFrame:CGRectMake(0, 10, kScreen_Width, segH) titles:@[@"未還",@"已還"]];
? ? segView.selectedIndex = 1;
? ? ESWeakSelf
? ? segView.clickIndex = ^(NSInteger index){
? ? ? ? self.isHK = NO;
? ? ? ? ESStrongSelf
? ? ? ? if(index==0){
? ? ? ? ? ? //未還
? ? ? ? ? ? self.rightButton.hidden = NO;
? ? ? ? }
? ? ? ? else if(index==1){
? ? ? ? ? ?//已還
? ? ? ? ? ? self.rightButton.hidden = YES;
? ? ? ? ? ? self.containView.hidden = YES;
? ? ? ? }
? ? ? ? self.tableView.frame = CGRectMake(0, 60, kScreen_Width, kScreen_Height-NavHeight-60);
? ? ? ? [self.tableView reloadData];
? ? };
? ?[self.view addSubView:segView];

效果圖：