tableview的展开和折叠

@implementation TableViewController

- (void)viewDidLoad {

    [super
viewDidLoad];

    

    // Uncomment the following line to preserve selection between presentations.

    // self.clearsSelectionOnViewWillAppear = NO;

    

    // Uncomment the following line to display an Edit button in the navigation bar for this view controller.

    // self.navigationItem.rightBarButtonItem = self.editButtonItem;

    

    self.sectionStatus=[[NSMutableArray
alloc]init];

    

    NSString *path=[[NSBundle
mainBundle]pathForResource:@"cities"
ofType:@"plist"];

    NSDictionary *dic=[NSDictionary
dictionaryWithContentsOfFile:path];

    self.provinces=[dic
objectForKey:@"provinces"];

    self.cities=[dic
objectForKey:@"cities"];

    //设置tableView的显示方式

   // self.tableView.style=[UITableViewStyleGrouped ];

   
//初始化每组的状态

    [self.provinces
enumerateObjectsUsingBlock:^(id 
_Nonnull obj, NSUInteger idx,
BOOL * _Nonnull stop) {

        [self.sectionStatus
addObject:@NO];

    }];

    

}

#pragma mark - Table view data source

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

    return
self.provinces.count;

}

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

    NSNumber *states=self.sectionStatus[section];

    int count =0;

    if ([states boolValue]) {

        NSArray *city= [self.cities
objectForKey:self.provinces[section]];

        count=(int)city.count;

    }

    else

    {

        count=0;

    }

        //return city.count;

    return count;

}

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

    static NSString *cellID=@"cell";

    

    [tableView registerClass:[UITableViewCell
class] forCellReuseIdentifier:cellID];

    

    UITableViewCell *cell = [tableView
dequeueReusableCellWithIdentifier:cellID
forIndexPath:indexPath];

   

    

    if (cell==nil) {

        cell=[[UITableViewCell
alloc]initWithStyle:UITableViewCellStyleDefault
reuseIdentifier:cellID];

    }

    NSArray *city= [self.cities
objectForKey:self.provinces[indexPath.section]];

    cell.textLabel.text=city[indexPath.row];

    

    return cell;

}

#pragma mark 设置组名

-(NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section

{

    return self.provinces[section];

}

#pragma mark 设置每一组头部显示的视图

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

{

    UIButton *btn=[[UIButton
alloc]init];

    //设置标题

    [btn setTitle:self.provinces[section]
forState:UIControlStateNormal];

    //标题颜色

    [btn setTitleColor:[UIColor
blackColor] forState:UIControlStateNormal];

    //设置tag

    btn.tag=section;

    //点击事件

    [btn addTarget:self
action:@selector(sectionHeaderClicked:)
forControlEvents:UIControlEventTouchUpInside];

    

    

    return btn;

    

}

-(void)sectionHeaderClicked:(UIButton *)sender

{

   
//修改组显示的状态

    NSNumber *state=self.sectionStatus[sender.tag];

    if ([state boolValue]) { 
//原来上展开的  YES

        [self.sectionStatus
removeObjectAtIndex:sender.tag];

        [self.sectionStatus
insertObject:@NO
atIndex:sender.tag];

    }

    else

    {

        [self.sectionStatus
removeObjectAtIndex:sender.tag];

        [self.sectionStatus
insertObject:@YES
atIndex:sender.tag];

    }

    //刷新表格数据

    [self.tableView
reloadData];

    NSLog(@"section=%ld",sender.tag);

}

@end