UITableView 折叠效果

1:创建一个model数据模型

#import <Foundation/Foundation.h>

@interface DataModel : NSObject

//保存section中每行的数据

@property(nonatomic,strong)NSMutableArray *array;

//section名

@property(nonatomic,copy)NSString *name;

//判断section是否展开

@property(nonatomic,assign)BOOL isExpand;

@end

#import "DataModel.h"

@implementation DataModel

-(id)init

{

if (self=[super init]) {

_array=[NSMutableArray array];

}

return self;

}

@end

2：创建一个viewcontroller

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController

@end

#import "ViewController.h"

#import "DataModel.h"

@interface ViewController ()<UITableViewDelegate,UITableViewDataSource>

@property (weak, nonatomic) IBOutlet UITableView *myTableView;

@property(nonatomic,strong)NSMutableArray *dataArray;

@end

@implementation ViewController

- (void)viewDidLoad

{

[super viewDidLoad];

_dataArray=[NSMutableArray array];

for (int i='A'; i<='D'; i++)

{

//设置组名

DataModel *model=[[DataModel alloc]init];

model.name=[NSString stringWithFormat:@"%c",i];

for (int j=0; j<5; j++) {

//设置每组中的行

[model.array addObject:[NSString stringWithFormat:@"%c-%d",i,j]];

}

[_dataArray addObject:model];

}

---PS:我已经在storyboard上面托线条进行关联---

//_myTableView.dataSource=self;

//_myTableView.delegate=self;

}

- (void)didReceiveMemoryWarning

{

[super didReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

#pragma mark - UITableViewDataSource

#pragma mark -UITableViewDataSource

//返回组数

-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView

{

return _dataArray.count;

}

//返回每组对应的行数

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

{

DataModel *model=_dataArray[section];

if (model.isExpand)

{

return model.array.count;

}

else

{

return 0;

}

}

//每行要显示的值

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

{

static NSString *CellIdentifier=@"Cell";

UITableViewCell *cell=[tableView dequeueReusableCellWithIdentifier:CellIdentifier];

if (cell==nil) {

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

}

DataModel *model=_dataArray[indexPath.section];

cell.textLabel.text=model.array[indexPath.row];

cell.accessoryType=UITableViewCellAccessoryDisclosureIndicator;

return cell;

}

//在组名上添加一个按钮

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

{

//添加一个view存放按钮

UIView *contentView=[[UIView alloc]initWithFrame:CGRectMake(0, 0, 320, 32)];

DataModel *model=_dataArray[section];

UIButton *btn=[UIButton buttonWithType:UIButtonTypeCustom];

btn.frame=CGRectMake(375-15, 5, 15, 8);

btn.tag=section;

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

if(model.isExpand)

{

[ btn setBackgroundImage:[UIImage imageNamed:@"open"] forState:UIControlStateNormal];

}

else

{

[ btn setBackgroundImage:[UIImage imageNamed:@"close"] forState:UIControlStateNormal];

}

[contentView addSubview:btn];

if (section%2==0)

{

contentView.backgroundColor=[UIColor colorWithRed:arc4random()%256/255.0 green:arc4random()%256/255.0 blue:arc4random()%256/255.0 alpha:1.0];

}

else

{

contentView.backgroundColor=[UIColor colorWithRed:arc4random()%256/255.0 green:arc4random()%256/255.0 blue:arc4random()%256/255.0 alpha:1.0];

}

return contentView;

}

//通过组名上的按钮来判断是否展开

-(void)btnClick:(UIButton *)sender

{

DataModel *data=_dataArray[sender.tag];

if (data.isExpand)

{

data.isExpand=NO;

}

else

{

data.isExpand=YES;

}

[_myTableView reloadData];

}

@end

3:测试效果图