Question

如何点击uitableview 的HeaderInSection隐藏或展开自section

Answer 1

首先定义一个标识符数组，用来表示每个section的展开收起状态

设置每个section的row个数的方法中，加入一个对标识符的判断
判断为 展开，即按照设定的个数来显示row（每个section的row个数，可以存在一个数组里）
判断为收起，则返回0

在header上添加button，绑定方法
方法中，根据button的tag值来判断点击的是哪个section，然后对响应section的标识符进行更改

基本流程就这样了

我写的练习代码供参考（没粘贴变量的声明部分，新手，见笑了...）：
#pragma mark - Other Method
//点击header的方法
-(void)tapHeader:(UIButton *)sender
{
if ([[openedInSectionArr objectAtIndex:sender.tag - 100] intValue] == 0) {
[openedInSectionArr replaceObjectAtIndex:sender.tag - 100 withObject:@"1"];
NSLog(@"%d打开",sender.tag);
}
else
{
[openedInSectionArr replaceObjectAtIndex:sender.tag - 100 withObject:@"0"];
NSLog(@"%d关闭",sender.tag);
}

[myTableView reloadData];
}
#pragma mark - TableView Method
-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{

return [mySectionArr count];
}

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

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

UIView * mySectionView = [[[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 40)] autorelease];
mySectionView.backgroundColor = [UIColor orangeColor];
UIButton * myButton = [UIButton buttonWithType:UIButtonTypeCustom];
myButton.imageView.image = [UIImage imageNamed:@"淡蓝头.png"];
myButton.frame = CGRectMake(0, 0, 320, 40);
myButton.tag = 100 + section;
[myButton addTarget:self action:@selector(tapHeader:) forControlEvents:UIControlEventTouchUpInside];
[mySectionView addSubview:myButton];

UILabel * myLabel = [[UILabel alloc] initWithFrame:CGRectMake(35, 0, 150, 30)];
myLabel.backgroundColor = [UIColor clearColor];
myLabel.text = [mySectionArr objectAtIndex:section];
[myButton addSubview:myLabel];
[myLabel release];

return mySectionView;
}

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// 判断section的展开收起状态
if ([[openedInSectionArr objectAtIndex:section] intValue] == 1) {
return [[rowOfSectionArr objectAtIndex:section] intValue];
}

return 0;
}

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
[self.navigationController pushViewController:memberInfoVC animated:YES];
}

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSString * string = @"cell";
UITableViewCell * cell = [tableView dequeueReusableCellWithIdentifier:string];
if (!cell) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:string] autorelease];
}
cell.textLabel.text = [mySectionArr objectAtIndex:indexPath.section];

return cell;
}

#pragma mark - View lifecycle

// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)loadView
{
UIView * myView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
myView.backgroundColor = [UIColor groupTableViewBackgroundColor];
self.view = myView;
[myView release];

memberInfoVC = [[MemberInfo alloc] init];

// sectionheader文字
mySectionArr = [[NSMutableArray alloc] initWithObjects:@"猪头", @"笨蛋", @"傻瓜", @"神经病", nil];
// 每个section中的row个数
rowOfSectionArr = [[NSMutableArray alloc] initWithObjects:@"2", @"3", @"4", @"2", nil];
// 每个section展开收起状态标识符
openedInSectionArr = [[NSMutableArray alloc] initWithObjects:@"0", @"0", @"0", @"0",nil];

myTableView = [[UITableView alloc] initWithFrame:CGRectMake(0, 0, 320, 418) style:UITableViewStylePlain];
myTableView.dataSource = self;
myTableView.delegate = self;
[self.view addSubview:myTableView];
[myTableView release];

}