大家好，又见面了，我是全栈君。
最近手上任务比较轻，打算把一些之前做一些的简单的东西再整理整理，优化一下，做个记录；
TableView的折叠拉伸主要是在一些联系人分组里会经常见到，今天做了一个简单的demo，代码也做了处理，随拿随用。
思路整理：
1.根据数据设置分组
2.设置折叠/拉伸状态标识
3.实现分组透视图点击事件
实现代码：
#import “FoldTableViewController.h”
#define STATE @”state”
#define INFO @”info”
@interface FoldTableViewController ()
{
NSMutableArray *_dataArray;//数据源数组
}
@end
@implementation FoldTableViewController
– (void)viewDidLoad {
[super viewDidLoad];
[self setExtraCellLineHidden];
[self requestData];
}
//底部视图留白
– (void)setExtraCellLineHidden{
UIView *view = [UIView new];
view.backgroundColor = [UIColor clearColor];
[self.tableView setTableFooterView:view];
}
//创建数据
– (void)requestData{
/**
假设有i组数据，每组有j条内容：
每组实例化一个可变字典存储组内数据，STATE对应当前状态（折叠/拉伸），INFO对应当前内容；
*/
_dataArray = [[NSMutableArray alloc]init];
for (int i = 0; i < 5; i++) {
NSMutableDictionary *tempDict = [[NSMutableDictionary alloc]init];
NSMutableArray *tempArr = [[NSMutableArray alloc]init];
for (int j = 0; j < 10; j++) {
NSString *infoStr = [NSString stringWithFormat:@”test%d”,j];
[tempArr addObject:infoStr];
}
[tempDict setValue:@”1″ forKey:STATE];
[tempDict setValue:tempArr forKey:INFO];
[_dataArray addObject:tempDict];
}
}
– (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark – Table view data source
– (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
return _dataArray.count;
}
– (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
NSString *state = _dataArray[section][STATE];
if ([state isEqualToString:@”0″]) {
return 0;
}
return [_dataArray[section][@”info”] count];
}
– (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
static NSString *ide = @”myCell”;
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:ide];
if (!cell) {
cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:ide];
}
//取到当前cell的内容
cell.textLabel.text = _dataArray[indexPath.section][@”info”][indexPath.row];
return cell;
}
– (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section{
UIView *headView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, KScreenWidth, 20)];
headView.tag = 10+section;
headView.backgroundColor = [UIColor grayColor];
UIImageView *imageView = [[UIImageView alloc]initWithFrame:CGRectMake(5, 5, 20, 20)];
[headView addSubview:imageView];
UILabel *titleLabel = [[UILabel alloc]initWithFrame:CGRectMake(40, 5, 100, 20)];
titleLabel.text = [NSString stringWithFormat:@”section%ld”,section];
titleLabel.textColor = [UIColor whiteColor];
[headView addSubview:titleLabel];
/**在刷新视图时，根据当前分组的状态，调整头视图的内容视图
*/
NSDictionary *dict = _dataArray[section];
if ([dict[STATE] isEqualToString:@”1″]) {
imageView.image = [UIImage imageNamed:@”arrow_spread”];
}else{
imageView.image = [UIImage imageNamed:@”arrow_fold”];
}
/**为头视图添加轻触事件
*/
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(headViewClick:)];
[headView addGestureRecognizer:tap];
return headView;
}
– (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section{
return 30;
}
– (void)headViewClick:(UITapGestureRecognizer *)tap{
NSInteger index = tap.view.tag-10;
NSMutableDictionary *dict = _dataArray[index];
/**点击头视图，改变该组状态
*/
if ([dict[STATE] isEqualToString:@”1″]) {
[dict setValue:@”0″ forKey:STATE];
}else{
[dict setValue:@”1″ forKey:STATE];
}
/**刷新当前点击分组的数据
reloadSections：需要刷新的分组
withRowAnimation：刷新的动画方式
*/
[self.tableView reloadSections:[NSIndexSet indexSetWithIndex:index] withRowAnimation:UITableViewRowAnimationNone];
}
– (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
[tableView deselectRowAtIndexPath:indexPath animated:YES];
}
转载于:https://juejin.im/post/5a31d4d451882526151a9ac2
发布者：全栈程序员-站长，转载请注明出处：https://javaforall.net/107830.html原文链接：https://javaforall.net
