需求:当外层tableview滑动到一定位置的时候保持不动,然后里层的tableview滑动.当里层tableview在最顶端的时候保持不动,滑动外层tableview.

思路:让两个tableview的手势都一起触发.当滑动到零界点其中一个tableview的contentOffset不变,另一个tableview继续滑动.

定义FirstTableView继承UITableView

@interface FirstTableView : UITableView

@end

#import "FirstTableView.h"

@implementation FirstTableView

// 是否支持多手势触发，返回YES，则可以多个手势一起触发方法(子tableview也可以滑动)，返回NO则为互斥
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
    return YES;
}

@end

定义SecondTableView继承UITableView

#import <UIKit/UIKit.h>

@interface SecondTableView : UITableView<UITableViewDelegate,UITableViewDataSource>
{
    UITableViewCell *cells[10];
    BOOL isCanScroll;
}

@end

#import "SecondTableView.h"

@implementation SecondTableView

- (id)initWithFrame:(CGRect)frame style:(UITableViewStyle)style
{
    if(self = [super initWithFrame:frame style:style])
    {
        self.dataSource = self;
        self.delegate = self;
        self.tableFooterView = [UIView new];
        isCanScroll = NO;
        [[NSNotificationCenter defaultCenter] addObserver:self
                                                 selector:@selector(test:)
                                                     name:@"test"
                                                   object:nil];
        for(int i = 0 ; i < 10; i++)
        {
            cells[i] = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"cell"];
            cells[i].frame = CGRectMake(0, 0, self.frame.size.width, 44.0f);
        }
        [self reloadData];
    }
    return self;
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return cells[indexPath.row].frame.size.height;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return 10;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    cells[indexPath.row].textLabel.text = @"2";
    return cells[indexPath.row];
}

- (void)test:(NSNotification *)n
{
    isCanScroll = YES;
}

- (void)scrollViewDidScroll:(UIScrollView *)scrollView{
    if(isCanScroll == NO)
    {
        [scrollView setContentOffset:CGPointZero animated:NO];
    }
    else
    {
        if(scrollView.contentOffset.y <= 0)
        {
            isCanScroll = NO;
            [[NSNotificationCenter defaultCenter] postNotificationName:@"test2" object:nil];
        }
    }
}

@end

viewcontroller.直接将FristTablview的contentOffset判断逻辑写在这里,没有封装.

#import <UIKit/UIKit.h>
#import "FirstTableView.h"
#import "SecondTableView.h"

@interface ViewController : UIViewController<UITableViewDataSource,UITableViewDelegate>
{
    FirstTableView *aTableView;
    SecondTableView *bTableView;
    UITableViewCell *cells[10];
}
@end

#import "ViewController.h"

@interface ViewController ()
{
    BOOL isCanScrollView;
}

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    aTableView = [[FirstTableView alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height) style:UITableViewStylePlain];
    aTableView.delegate = self;
    aTableView.dataSource = self;
    aTableView.tableFooterView = [UIView new];
    [self.view addSubview:aTableView];
    isCanScrollView = YES;
    for(int i = 0 ; i < 10; i++)
    {
        cells[i] = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"cell"];
        cells[i].frame = CGRectMake(0, 0, self.view.frame.size.width, 44.0f);
    }
    bTableView = [[SecondTableView alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height) style:UITableViewStylePlain];
    cells[9].frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);
    [cells[9] addSubview:bTableView];
    [aTableView reloadData];
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(test2:)
                                                 name:@"test2"
                                               object:nil];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (void)test2:(NSNotification *)n
{
    isCanScrollView = YES;
}

- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
    if(isCanScrollView)
    {
        //大于这个临界值就保持不变
        if(scrollView.contentOffset.y > 300)
        {
            [scrollView setContentOffset:CGPointMake(0, 300) animated:NO];
            [[NSNotificationCenter defaultCenter] postNotificationName:@"test" object:nil];
            isCanScrollView = NO;
        }
    }
    else
    {
        [scrollView setContentOffset:CGPointMake(0, 300) animated:NO];
    }
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return cells[indexPath.row].frame.size.height;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return 10;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    cells[indexPath.row].textLabel.text = @"1";
    return cells[indexPath.row];
}

@end

源代码:https://github.com/fero2004/UITableViewInUITableView/tree/master/tableviewtest