iOS开发——二级列表

　　原理很简单，一级菜单放在viewForHeaderInSection里面，加一个点击事件，然后判断它的二级菜单（cell）显不显示。

　　直接上代码吧！

//

//  HeheTableViewController.m

//  Demo-tableView

//

//  Created by yyt on 16/5/13.

//  Copyright © 2016年 yyt. All rights reserved.

//

#import "HeheTableViewController.h"

#define klScreenWidth self.view.bounds.size.width

@interface HeheTableViewController ()

@property(nonatomic,strong) NSArray *dataArr;

@property(nonatomic,strong) NSMutableArray *tapButtons;

@property(nonatomic,strong) NSMutableArray *openedIndexArr;

@end

@implementation HeheTableViewController

- (void)viewDidLoad {

[super viewDidLoad];

_dataArr = @[@{@"name":@"A区",

@"arr":@[@"A1",@"A2",@"A3",@"A4"]

},

@{@"name":@"B区",

@"arr":@[@"B1",@"B2",@"B3"]

},

@{@"name":@"C区",

@"arr":@[@"C1",@"C2",@"C3",@"C4",@"C5",@"C6"]

},

@{@"name":@"D区",

@"arr":@[@"D1",@"D2",@"D3",@"D4",@"D5"]

}

];

_tapButtons = [NSMutableArray array];

_openedIndexArr = [NSMutableArray array];

}

#pragma mark - TableViewDataSource

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

return _dataArr.count;

}

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

NSString *str = [NSString stringWithFormat:@"%ld",section];

if ([_openedIndexArr containsObject:str]) {

NSDictionary *dict = _dataArr[section];

NSArray *arr = dict[@"arr"];

return arr.count;

}

return 0;

}

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

UITableViewCell *cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:@"cell"];

NSString *str = [NSString stringWithFormat:@"%ld",indexPath.section];

if ([_openedIndexArr containsObject:str]) {

NSDictionary *dict = _dataArr[indexPath.section];

NSArray *arr = dict[@"arr"];

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

}

cell.selectionStyle = UITableViewCellSelectionStyleNone;

return cell;

}

#pragma mark - TableViewDelegate

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

return 50;

}

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

UIView *bgView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, klScreenWidth, 50)];

bgView.backgroundColor = [UIColor greenColor];

NSDictionary *dict = _dataArr[section];

NSString *title = dict[@"name"];

UILabel *titleLabel = [[UILabel alloc] initWithFrame:CGRectMake(20, 10, klScreenWidth-40, 30)];

titleLabel.text = title;

titleLabel.textColor = [UIColor whiteColor];

titleLabel.font = [UIFont systemFontOfSize:22];

[bgView addSubview:titleLabel];

UIButton *tapButton = [UIButton buttonWithType:UIButtonTypeCustom];

tapButton.frame = bgView.frame;

[tapButton addTarget:self action:@selector(openOrCloseSectionView:) forControlEvents:UIControlEventTouchUpInside];

[_tapButtons addObject:tapButton];

[bgView addSubview:tapButton];

return bgView;

}

- (void)openOrCloseSectionView:(UIButton*)sender {

NSInteger index = [_tapButtons indexOfObject:sender];

NSString *str = [NSString stringWithFormat:@"%ld",index];

if ([_openedIndexArr containsObject:str]) {

[_openedIndexArr removeObject:str];

} else {

[_openedIndexArr addObject:str];

}

[_tapButtons removeAllObjects];

[self.tableView reloadData];

}

@end