在ios开发中，特别是在做电商类的app时经常会有需求，要求tableivew的上下左右滑动，类似像闲🐟首页的效果，其实就是scrollview与tableview的嵌套，这个我相信大家都知道，那怎么实现上下左右滑动呢，有些同学就使用他们之间的联动，以及一些手势来做，确实可以实现，但体验极差，还会有停顿，性能就更差了。

而且东风要告诉大家一个事实，在实际开发中一定不能使用scrollview与tableview的嵌套来实现上下左右滑动，不要问为什么，只有这么做过的人，痛过的人才知道，好吧，不装B了。稍微解释下，如果使用scrollview与tableview的嵌套就会导致controller.m的代码太多，使代码的整体灵活性降低，不利于以后的需求变更，而且稍微数据没处理好就会导致崩溃，正确的做法是使用scrollview与controller嵌套，然后在controller中加载tableview，最后将controller的view加载到scrollview，通过代理或block再回到原来的controller中处理事件。

今天东风在这里给大家展示这种简便，轻快的方法实现。(主要是运用了tableview的headview来做文章，大家自己看吧)
当然东风这里给大家展示的只是其中一种方法，当然还有更好的方法，就等大家自己去开发吧，知识就看你怎么用了。
源码demo git地址：https://github.com/cocoaliaolei/tableView.git
首先我们先建一个工程，直接在viewcontroller.m中直接写代码(太懒了，将就吧)先把宏写好吧

#import "ViewController.h"
#import "TableViewController.h"
#import "HeadView.h"

#define WD [UIScreen mainScreen].bounds.size.width
#define HG [UIScreen mainScreen].bounds.size.height
#define count 3//三个tableview

添加成员属性

@property (nonatomic,strong)UIScrollView *scrolView;//全局scrollview使可以左右滑动
@property (nonatomic,strong)NSMutableArray *aray;//用于装scroller中的controller
@property (nonatomic,strong)HeadView *hView;//headview

先来三个懒加载(果然懒)

-(UIScrollView *)scrolView{
    
    if (!_scrolView) {
        
        _scrolView = [[UIScrollView alloc]initWithFrame:CGRectMake(0, 0, WD, HG)];
        _scrolView.pagingEnabled = YES;
        _scrolView.bounces = NO;
        _scrolView.delegate = self;
        _scrolView.contentSize = CGSizeMake(count * WD, HG);
        
    }
    return _scrolView;
}
-(HeadView *)hView{
    if (!_hView) {
        _hView = [[HeadView alloc]initWithFrame:CGRectMake(0, 0, WD, 240)];
        _hView.delegate = self;
    }
    return _hView;
}

-(NSMutableArray *)aray{
    
    if (!_aray) {
        _aray = [[NSMutableArray alloc]init];
    }
    return _aray;
}

viewdidload中创建控件

- (void)viewDidLoad {
    [super viewDidLoad];
    [self initView];
}
-(void)initView{
    
    [self creatScrollView];
    [self creatTableView];
    [self creatHeadView];
}

-(void)creatScrollView{
    
    [self.view addSubview:self.scrolView];
}

-(void)creatHeadView{
    [self.view addSubview:self.hView];
}
-(void)creatTableView{
    
    for (int i = 0; i < count; i ++) {
        
        TableViewController *tbCtl = [[TableViewController alloc]init];
        
        tbCtl.delegate = self;
        
        [self.aray addObject:tbCtl];
        
        tbCtl.view.frame = CGRectMake(i * WD, 0, WD, HG);
        
        tbCtl.view.tag = 10 + i;
        
        [self.scrolView addSubview:tbCtl.view];
        
    }
    
}

TableViewController.h文件

#import "ViewController.h"


@protocol TableViewControllerDelegate <NSObject>

@optional
-(void)TableViewControllerScrollto:(CGFloat)locattionY;
@end

@interface TableViewController : UIViewController

@property (nonatomic,strong)UITableView *tbView;

@property (nonatomic,weak)id<TableViewControllerDelegate>delegate;

@end

TableViewController.m文件

#import "TableViewController.h"

#define WD [UIScreen mainScreen].bounds.size.width
#define HG [UIScreen mainScreen].bounds.size.height

@interface TableViewController ()<UITableViewDataSource,UITableViewDelegate>

@end

@implementation TableViewController

-(UITableView *)tbView{
    if (!_tbView) {
        _tbView = [[UITableView alloc]initWithFrame:CGRectMake(0, 0, WD, HG)];
        _tbView.delegate   = self;
        _tbView.dataSource = self;
        _tbView.showsVerticalScrollIndicator = NO;
        [_tbView registerClass:[UITableViewCell class]  forCellReuseIdentifier:@"cell"];
    }
    return _tbView;
}

- (void)viewDidLoad {
    
    [super viewDidLoad];
    [self initView];
    
}

-(void)initView{
    
    [self.view addSubview:self.tbView];
    
}

-(UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section{
    
    return [UIView new];
    
}
-(CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section{
    
    return 240;
}

-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
    return 1;
}

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
    return 40;
}

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell" forIndexPath:indexPath];
    
    cell.textLabel.text = [NSString stringWithFormat:@"春暖花开-%d-%d",(int)self.view.tag - 10,(int)indexPath.row];
    
    return cell;
}

-(void)scrollViewDidScroll:(UIScrollView *)scrollView{
    
    CGFloat f = scrollView.contentOffset.y;
    if (_delegate && [_delegate respondsToSelector:@selector(TableViewControllerScrollto:)]) {
        [_delegate TableViewControllerScrollto:f];
    }
}

@end

HeadView.h文件

#import <UIKit/UIKit.h>
@class HeadView;

@protocol HeadViewDelegate <NSObject>

@optional
-(void)HeadViewSelectedBtutton:(NSInteger)indexs;

@end

@interface HeadView : UIView

@property (nonatomic,weak)id<HeadViewDelegate>delegate;

-(void)headViewUpdateBottomLineState:(int)indexs;

@end

HeadView.m文件

#import "HeadView.h"

@interface HeadView ()
{
    UIButton *temBtn;
}

@property (nonatomic,strong)UIView *Line;

@end


@implementation HeadView
-(UIView *)Line{
    if (!_Line) {
        
        _Line = [[UIView alloc]initWithFrame:CGRectMake(0, self.frame.size.height - 1, self.frame.size.width / 3, 1)];
        
        _Line.backgroundColor = [UIColor redColor];
        
    }
    return _Line;
}

-(instancetype)initWithFrame:(CGRect)frame{
    
    if (self = [super initWithFrame:frame]) {
        self.backgroundColor = [UIColor whiteColor];
        [self initView];
    }
    return self;
}

-(void)initView{
    
    UIImageView *imgView = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0,self.frame.size.width, self.frame.size.height - 40)];
    
    imgView.image = [UIImage imageNamed:@"11.jpg"];
    
    [self addSubview:imgView];
    
    CGFloat y = CGRectGetMaxY(imgView.frame);
    
    [self addSubview:[self creatButton:CGRectMake(0, y, self.frame.size.width/3, 39) :@"想你的夜" :120]];
    
    [self addSubview:[self creatButton:CGRectMake(self.frame.size.width/3, y, self.frame.size.width/3, 39) :@"多希望你" :121]];
    
    [self addSubview:[self creatButton:CGRectMake(self.frame.size.width*2/3, y, self.frame.size.width/3, 39) :@"能在我身边" :122]];
    
    [self addSubview:self.Line];
    
}


-(UIButton *)creatButton:(CGRect)frame :(NSString *)title :(NSInteger)tag{
    
    UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
    
    btn.frame = frame;
    
    btn.titleLabel.font = [UIFont systemFontOfSize:15];
    
    if (tag == 120){
        temBtn = btn;
        btn.selected = YES;
    }
    
    btn.tag = tag;
    
    [btn setTitle:title forState:UIControlStateNormal];
    
    [btn setTitleColor:[UIColor blueColor] forState:UIControlStateSelected];
    
    [btn setTitleColor:[UIColor grayColor] forState:UIControlStateNormal];
    
    [btn addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];
    
    return btn;
}

-(void)btnClick:(UIButton *)btn{
    
    temBtn.selected = NO;
    btn.selected = YES;
    temBtn = btn;
    
    if (_delegate && [_delegate respondsToSelector:@selector(HeadViewSelectedBtutton:)]) {
        [_delegate HeadViewSelectedBtutton:btn.tag - 120];
    }
    
    switch (btn.tag) {
        case 120:
            [self setBottomLine:0];
            break;
        case 121:
            [self setBottomLine:self.frame.size.width / 3];
            break;
        case 122:
            [self setBottomLine:self.frame.size.width*2 / 3];
            break;
            
        default:
            break;
    }
}


-(void)setBottomLine:(CGFloat)x{
    
    CGRect rect = self.Line.frame;
    
    rect.origin.x = x;
    
    [UIView animateWithDuration:0.23 animations:^{
        
        self.Line.frame = rect;
        
    }];
}

-(void)headViewUpdateBottomLineState:(int)indexs{
    
    temBtn.selected = NO;
    UIButton *btn = (UIButton *)[self viewWithTag:120 + indexs];
    btn.selected = YES;
    temBtn = btn;
    
    [self setBottomLine:self.frame.size.width *indexs / 3];
    
}

@end