1. iOS(OC)菜单头部封装
   .h代码如下；

@interface TitleScrollView : UIView<UIScrollViewDelegate>
@property (nonatomic,strong) UIScrollView *titleScroller;
@property (nonatomic,strong)UIButton *selectBtn;
@property (nonatomic,strong)NSArray *titleArr;
@property(nonatomic,copy)void(^clickTitleScrollView)(NSInteger);//tag
@end

.m代码如下；

#import "TitleScrollView.h"

@implementation TitleScrollView
- (instancetype)initWithFrame:(CGRect)frame{
    
    self = [super initWithFrame:frame];
    if (self) {
        self.backgroundColor = [UIColor whiteColor];
        [self creatScrollerView];
    }
    return self;
}
-(void)setTitleArr:(NSArray *)titleArr{
    _titleArr = titleArr;
    for (UIView *view in self.titleScroller.subviews) {
           [view removeFromSuperview];
       }
     CGFloat totalWidth = 20;
     for (int i = 0 ; i < self.titleArr.count; i++){
      CGRect rect = [self.titleArr[i] boundingRectWithSize:CGSizeMake(MAXFLOAT, 44) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:16]} context:nil];
      UIButton *titleBtn = [UIButton buttonWithType:UIButtonTypeCustom];
      titleBtn.frame = CGRectMake(totalWidth, 0, rect.size.width, 44);
      totalWidth = totalWidth + rect.size.width + 20;
      titleBtn.titleLabel.font = [UIFont systemFontOfSize:16];
      [titleBtn setTitle:self.titleArr[i] forState:UIControlStateNormal];
      [titleBtn setTitleColor:[UIColor colorWithRed:166/255.0 green:167/255.0 blue:168/255.0 alpha:1.0] forState:UIControlStateNormal];
      [titleBtn setTitleColor:[UIColor blueColor] forState:UIControlStateSelected];
      titleBtn.tag = 400 + i;
      [titleBtn addTarget:self action:@selector(titleBtnClick:) forControlEvents:UIControlEventTouchUpInside];
      [self.titleScroller addSubview:titleBtn];
      if (i == 0){
          self.selectBtn = titleBtn;
          titleBtn.selected = YES;
          UIView *lineView = [[UIView alloc]initWithFrame:CGRectMake(titleBtn.center.x-20, 41,40 , 3)];
          lineView.backgroundColor = [UIColor blueColor];
          lineView.tag = 222;
          [self.titleScroller addSubview:lineView];
      }
    }
      if (totalWidth > kScreenWidths){
          self.titleScroller.contentSize = CGSizeMake(totalWidth,44);
      }
          self.titleScroller.showsHorizontalScrollIndicator = NO;
}
-(void)creatScrollerView{
      self.titleScroller = [[UIScrollView alloc]initWithFrame:CGRectMake(0,0,kScreenWidths ,44)];
      self.titleScroller.backgroundColor = [UIColor whiteColor];
      self.titleScroller.layer.shadowColor = [UIColor darkGrayColor].CGColor;
      self.titleScroller.layer.shadowOffset = CGSizeMake(0, 5);
      self.titleScroller.layer.shadowOpacity = 0.3;
      self.titleScroller.layer.shadowRadius = 3;
      self.titleScroller.layer.masksToBounds = NO;
      [self addSubview:self.titleScroller];
}
-(void)titleBtnClick:(UIButton *)sender{
    if (sender != self.selectBtn){
        self.selectBtn.selected = NO;
        sender.selected = YES;
        self.selectBtn = sender;
        UIView *lineView = [self viewWithTag:222];
        lineView.frame = CGRectMake(sender.center.x-20, 41, 40, 3);
        if (CGRectGetMaxX(sender.frame)>kScreenWidths){
            self.titleScroller.contentOffset = CGPointMake(CGRectGetMaxX(sender.frame)-kScreenWidths+20, 0);
        }else {
            self.titleScroller.contentOffset = CGPointMake(0, 0);
        }
       if(self.clickTitleScrollView!= nil) {
           self.clickTitleScrollView(sender.tag);
       }
    }
}

2:控制器使用方法:

#import "QTItemViewController.h"
#import "TitleScrollView.h"
#import "view1.h"
#import "view2.h"
#import "view3.h"
#import "view4.h"
#import "view5.h"
#import "view6.h"
@interface QTItemViewController ()
@property (nonatomic,strong)NSArray *titleArr;
@property (nonatomic,strong)TitleScrollView *titleScroller;
@property (nonatomic,strong)UIButton *selectBtn;
@property (nonatomic,strong)view1 *view1;
@property (nonatomic,strong)view2 *view2;
@property (nonatomic,strong)view3 *view3;
@property (nonatomic,strong)view4 *view4;
@property (nonatomic,strong)view5 *view5;
@property (nonatomic,strong)view6 *view6;
@end

@implementation QTItemViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.navigationItem.title = @"演示demo";
    self.view.backgroundColor = [UIColor colorWithRed:243/255.0 green:246/255.0 blue:252/255.0 alpha:1.0];
    [self.navigationController.navigationBar setBackgroundImage:[[UIImage alloc] init] forBarMetrics:UIBarMetricsDefault];
    [self.navigationController.navigationBar setShadowImage:[[UIImage alloc] init]];
    self.titleScroller = [[TitleScrollView alloc]initWithFrame:CGRectMake(0,kNavigationBarHeight,kScreenWidths,44)];
    self.titleScroller.backgroundColor = [UIColor redColor];
    __weak typeof(self) weakSelf = self;
    self.titleScroller.clickTitleScrollView = ^(NSInteger buttonIndex) {
        NSLog(@"%ld",(long)buttonIndex);
        [weakSelf clickButton:buttonIndex];
    };
    [self.view addSubview:self.titleScroller];
    [self getData];
    [self clickButton:400];
}
-(void)getData{
   self.titleArr = [NSArray arrayWithObjects:@"活动1",@"活动2",@"活动3",@"活动4",@"活动5", @"活动6",nil];
   self.titleScroller.titleArr = self.titleArr;
}
-(void)clickButton:(NSInteger)senderTag{
     if ([self.view viewWithTag:100] != nil) {
            [[self.view viewWithTag:100] removeFromSuperview];
        }
     if ([self.view viewWithTag:101] != nil) {
        [[self.view viewWithTag:101] removeFromSuperview];
     }
    if ([self.view viewWithTag:102] != nil) {
               [[self.view viewWithTag:102] removeFromSuperview];
           }
    if ([self.view viewWithTag:103] != nil) {
       [[self.view viewWithTag:103] removeFromSuperview];
    }
    if ([self.view viewWithTag:104] != nil) {
               [[self.view viewWithTag:104] removeFromSuperview];
           }
    if ([self.view viewWithTag:105] != nil) {
       [[self.view viewWithTag:105] removeFromSuperview];
    }
    switch (senderTag) {
        case 400:
            if (!_view1) {
                _view1 = [[view1 alloc]initWithFrame:CGRectMake(0,44 + kNavigationBarHeight, kScreenWidth,kScreenHeight - kNavigationBarHeight)];
                _view1.tag = 100;
                }
            [self.view addSubview:self.view1];
            break;
        case 401:
           if (!_view2) {
              _view2 = [[view2 alloc]initWithFrame:CGRectMake(0,44 + kNavigationBarHeight, kScreenWidth,kScreenHeight - kNavigationBarHeight)];
              _view2.tag = 101;
              }
          [self.view addSubview:self.view2];
            break;
        case 402:
           if (!_view3) {
               _view3 = [[view3 alloc]initWithFrame:CGRectMake(0,44 + kNavigationBarHeight, kScreenWidth,kScreenHeight - kNavigationBarHeight)];
               _view3.tag = 102;
               }
           [self.view addSubview:self.view3];
           break;
       case 403:
          if (!_view4) {
             _view4 = [[view4 alloc]initWithFrame:CGRectMake(0,44 + kNavigationBarHeight, kScreenWidth,kScreenHeight - kNavigationBarHeight)];
             _view4.tag = 103;
             }
         [self.view addSubview:self.view4];
           break;
       case 404:
          if (!_view5) {
              _view5 = [[view5 alloc]initWithFrame:CGRectMake(0,44 + kNavigationBarHeight, kScreenWidth,kScreenHeight - kNavigationBarHeight)];
              _view5.tag = 104;
              }
          [self.view addSubview:self.view5];
          break;
        case 405:
         if (!_view6) {
            _view6= [[view6 alloc]initWithFrame:CGRectMake(0,44 + kNavigationBarHeight, kScreenWidth,kScreenHeight - kNavigationBarHeight)];
            _view6.tag = 105;
            }
        [self.view addSubview:self.view6];
          break;
        default:
            break;
    }
}

3.效果展示:

Simulator Screen Shot - iPhone 11 Pro Max - 2020-04-30 at 15.49.37.png