两个tableView联动效果实现.饿了么.美团

2018-02-27 11:15:46来源:https://www.jianshu.com/p/77099c89a624作者:何华超Kevin人点击

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1.实现方式1.1 点左边的时候实现右边的tableview滚动到相应的section:[self.tableView selectRowAtIndexPath:indexPath animated:YES scrollPosition:UITableViewScrollPositionTop];1.2 右边的tableview滚到的时候左边的跟着动动,主要的思维就是拿到右边的tableview的visibleCells,再取出第一个cell,根据cell取出indexPath。做项目的时候有个小插曲就是cell会取不到正确的位置,后来排查是因为frame值的位数太小,0.00005之类的导致的,后来直接取整.2.GitHub链接:https://github.com/hehuachaoKevin/TwoTableViewConnected
3.代码


//// LeftTableView.m// TwoTableViewConnected//// Created by KevinHe on 2017/12/21.// Copyright © 2017年 KevinHehuachao. All rights reserved.//#import "LeftTableView.h"@interface LeftTableView ()@property (nonatomic,assign)NSInteger currentSelectedIndex;

@end

@implementation LeftTableView

- (instancetype)init

{

self = [super init];

if (self) {

[self createUI];

[self initData];

}

return self;

}

- (void)initData{

self.currentSelectedIndex = 0;

}

- (void)refreshData:(NSArray*)dataArray{

[self.dataSource removeAllObjects];

[self.tableView reloadData];

[self setSeletedIndex:self.currentSelectedIndex];

}

- (void)createUI{

UITableView *tableView = [[UITableView alloc]initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH*3/10.0, SCREEN_HEIGHT-64) style:UITableViewStyleGrouped];

tableView.dataSource = self;

tableView.delegate = self;

tableView.showsVerticalScrollIndicator = NO;

tableView.bounces = NO;

[tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"LeftTableViewUITableViewCell"];

tableView.tableHeaderView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH*3/10.0, CGFLOAT_MIN)];

self.tableView = tableView;

[self addSubview:self.tableView];

self.backgroundColor =  [UIColor colorWithRed:250/255.0 green:250/255.0 blue:250/255.0 alpha:1];

self.tableView.backgroundColor =  [UIColor colorWithRed:250/255.0 green:250/255.0 blue:250/255.0 alpha:1];

}

- (void)setSeletedIndex:(NSInteger)index{

if (self.currentSelectedIndex == index) {

return;

}

self.currentSelectedIndex = index;

[self.tableView reloadData];

NSIndexPath *indexPath = [NSIndexPath indexPathForRow:index inSection:0];

if (self.dataSource.count>index) {

[self.tableView selectRowAtIndexPath:indexPath animated:NO scrollPosition:UITableViewScrollPositionMiddle];

}

}

- (NSInteger)currentSeletedIndex{

return self.tableView.indexPathForSelectedRow.row;

}

#pragma mark - tableView.dataSource

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{

return 10;

}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"LeftTableViewUITableViewCell"];

if (self.currentSelectedIndex == indexPath.row) {

cell.backgroundColor =  [UIColor whiteColor];

}

else{

cell.backgroundColor =  [UIColor colorWithRed:250/255.0 green:250/255.0 blue:250/255.0 alpha:1];

}

cell.textLabel.text = [NSString stringWithFormat:@"%ld",(long)indexPath.row];

return cell;

}

#pragma mark - delegate.tableview

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{

self.currentSelectedIndex = indexPath.row;

[self.tableView reloadData];

UITableViewCell *cell = [self.tableView cellForRowAtIndexPath:indexPath];

[self setCellSelected:cell];

NSIndexPath *indexPathTemp = [NSIndexPath indexPathForRow:0 inSection:indexPath.row];

if ([self.delegate respondsToSelector:@selector(setCurrentIndexPath:)]) {

[self.delegate setCurrentIndexPath:indexPathTemp];

}

}

- (void)setCellSelected:(UITableViewCell *)cell{

if (cell) {

cell.backgroundColor = [UIColor whiteColor];

}

}


//// ViewController.m// TwoTableViewConnected//// Created by KevinHe on 2017/12/21.// Copyright © 2017年 KevinHehuachao. All rights reserved.//#import "ViewController.h"#import "LeftTableView.h"@interface ViewController ()@property (nonatomic,weak)UITableView *tableView;

@property (nonatomic,strong)NSMutableArray *dataSource;

@property (nonatomic,weak)LeftTableView *leftTableView;

@property (nonatomic,assign)BOOL leftTableViewNeedScroll;

@end

@implementation ViewController

- (void)viewDidLoad {

[super viewDidLoad];

[self createUI];

[self initData];

}

- (void)initData{

//注意 要初始化

self.leftTableViewNeedScroll = YES;

}

- (void)createUI{

//左边视图

LeftTableView *leftTableView = [[LeftTableView  alloc]init];

[self.view addSubview:leftTableView];

_leftTableView = leftTableView;

_leftTableView.frame = CGRectMake(0, 64, SCREEN_WIDTH*3/10, SCREEN_HEIGHT-64);

self.leftTableView.delegate = self;

self.leftTableView.backgroundColor =  [UIColor colorWithRed:250/255.0 green:250/255.0 blue:250/255.0 alpha:1];

//tableView

UITableView *tableView = [[UITableView alloc]initWithFrame:CGRectMake(SCREEN_WIDTH*3/10.0, 64, SCREEN_WIDTH*7/10.0, SCREEN_HEIGHT-64) style:UITableViewStylePlain];

tableView.dataSource = self;

tableView.delegate = self;

tableView.showsVerticalScrollIndicator = NO;

tableView.bounces = NO;

[tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"UITableViewCell"];

tableView.backgroundColor = [UIColor grayColor];

self.tableView = tableView;

[self.view addSubview:self.tableView];

//ios 11 以上的问题

self.tableView.estimatedRowHeight = 0;

self.tableView.estimatedSectionHeaderHeight = 0;

self.tableView.estimatedSectionFooterHeight = 0;

}

#pragma mark - scrollView.delegate

- (void)scrollViewDidScroll:(UIScrollView *)scrollView{

[self getCurrentSection];

}

- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView{

self.leftTableViewNeedScroll = YES;

}

//调整左边的tableview

- (void)getCurrentSection{

NSArray *array = [self.tableView visibleCells];

if (array.count) {

UITableViewCell *cell = [array objectAtIndex:0];

NSIndexPath *indexPath = [self.tableView indexPathForCell:cell];

if (indexPath) {

if ([self.leftTableView currentSeletedIndex]!=indexPath.section

&& self.leftTableViewNeedScroll) {

[self.leftTableView setSeletedIndex:indexPath.section];

}

}

}

}

#pragma mark - delegate.LeftTableView

- (void)setCurrentIndexPath:(NSIndexPath*)indexPath{

self.leftTableViewNeedScroll = NO;

NSArray *array = [self.tableView visibleCells];

if (array.count) {

UITableViewCell *cell = [array objectAtIndex:0];

NSIndexPath *indexPathTemp = [self.tableView indexPathForCell:cell];

if (indexPath) {

if (indexPathTemp.section!=indexPath.section) {

[self.tableView selectRowAtIndexPath:indexPath animated:YES scrollPosition:UITableViewScrollPositionTop];

}

}

}

}

#pragma mark - tableView.delegate

- (nullable UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section{

UILabel *label = [[UILabel alloc]init];

label.frame = CGRectMake(0, 0, SCREEN_WIDTH, 36);

label.text = [NSString stringWithFormat:@"%ld",(long)section];

return label;

}

- (CGFloat)tableView:(UITableView*)tableView heightForHeaderInSection:(NSInteger)section{

return 36;

}

#pragma mark - tableView.dataSource

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{

return 10;

}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{

return 10;

}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"UITableViewCell"];

cell.textLabel.text = [NSString stringWithFormat:@"section=%ld row=%ld",indexPath.section,indexPath.row];

return cell;

}

#pragma mark - 点击事件

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{


}








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