iOS开发之--简单的二级联动页面

1、文件目录

 2、默认选中第0个，然后左侧菜单栏点击切换分类，右侧刷新数据，很简单，这里做个记录

默认选中代码：

- (void)setSelected:(BOOL)selected animated:(BOOL)animated {
    [super setSelected:selected animated:animated];
    self.leftView.hidden = selected == YES ? NO:YES;
    self.lab.textColor = selected == YES ? UIColor.whiteColor:UIColor.lightGrayColor;
    self.lab.backgroundColor = selected == YES ? UIColor.blackColor : UIColor.whiteColor;
    
    // Configure the view for the selected state
}

3、思路狠简单，解析数据，转数据模型，然后传递相应model即可，具体代码如下：

#define Window_Bounds   [UIScreen mainScreen].bounds
#define Window_H        [[UIScreen mainScreen] bounds].size.height
#define Window_W        [[UIScreen mainScreen] bounds].size.width

#import "ViewController.h"
#import "leftCell.h"
#import "rightCell.h"
#import "Model.h"
#import "MJExtension.h"
#import "NSString+MJExtension.h"
#import "NSObject+MJClass.h"
#import "subModel.h"

@interface ViewController ()<UITableViewDelegate,UITableViewDataSource>
{
    UITableView *_leftTableV;
    UITableView *_rightTableV;
    NSIndexPath *_selIndexPath;
    rightCell *cell;
}

@property (nonatomic, strong) NSMutableArray *dataAry,*subcategories;

@end

@implementation ViewController

#pragma mark -- 懒加载数据源
- (NSMutableArray *)dataAry
{
  if (!_dataAry) {
      _dataAry = [NSMutableArray array];
      //获取文件路径
      NSString *filePath = [[NSBundle mainBundle] pathForResource:@"text" ofType:@"json"];
      //获取文件内容
      NSString *jsonStr  = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:nil];
      //将文件内容转成数据
      NSData *jaonData   = [jsonStr dataUsingEncoding:NSUTF8StringEncoding];
      //将数据转成数组
      NSDictionary *dataDcit = [NSJSONSerialization JSONObjectWithData:jaonData options:NSJSONReadingMutableContainers error:nil];
      NSMutableArray *cateAry = [NSMutableArray arrayWithArray:dataDcit[@"data"][@"categories"]];
      NSLog(@"cateAry is %@",cateAry);
      for (NSDictionary *dict in cateAry) {
          Model *model = [Model mj_objectWithKeyValues:dict];
          [_dataAry addObject:model];
      }
  }
  return _dataAry;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    _leftTableV = [[UITableView alloc]initWithFrame:CGRectMake(0, 0, 100, Window_H) style:UITableViewStylePlain];
    _leftTableV.delegate = self;
    _leftTableV.dataSource = self;
    _leftTableV.tableFooterView = [UIView new];
    [self.view addSubview:_leftTableV];
    
    [_leftTableV selectRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:0] animated:NO scrollPosition:UITableViewScrollPositionTop];

    
    _rightTableV = [[UITableView alloc]initWithFrame:CGRectMake(100, 0, Window_W-100, Window_H) style:UITableViewStylePlain];
    _rightTableV.delegate = self;
    _rightTableV.dataSource = self;
    _rightTableV.tableFooterView = [UIView new];
    [self.view addSubview:_rightTableV];

}

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
    if (tableView == _leftTableV) {
        return self.dataAry.count;
    }
    
    return self.subcategories.count;
}

-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return 50.0f;
}

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (tableView == _leftTableV) {
        static NSString *left_cellIdentifier = @"leftCell";
        leftCell *cell = [_leftTableV dequeueReusableCellWithIdentifier:left_cellIdentifier];
        if (!cell) {
            cell = [[leftCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:left_cellIdentifier];
            cell.lab.text = [NSString stringWithFormat:@"%@",_dataAry[indexPath.row]];
            cell.selectionStyle = UITableViewCellSelectionStyleNone;
        }
                
        cell.model = self.dataAry[indexPath.row];
        
        return cell;
    }else{
        static NSString *right_cellIdentifier = @"rightCell";
        cell = [_rightTableV dequeueReusableCellWithIdentifier:right_cellIdentifier];
        if (!cell) {
            cell = [[rightCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:right_cellIdentifier];
        }
        
        cell.subModel = self.subcategories[indexPath.row];
                
        return cell;
    }
}

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
    if (tableView == _leftTableV) {
        
        [self.subcategories removeAllObjects];
        
        //当前选中的索引
        _selIndexPath = indexPath;
        
        [self setSubData];
        
        [_rightTableV reloadData];
    }
}


-(NSMutableArray *)subcategories{
    if (!_subcategories) {
        //默认选中展示数据
        _subcategories = [NSMutableArray array];
        [self setSubData];
    }
    return  _subcategories;
}

-(void)setSubData{
    Model *model = [[Model alloc]init];
    model = self.dataAry[_selIndexPath.row];
    NSMutableArray *subAry = [NSMutableArray arrayWithArray:model.subcategories];
    for (NSDictionary *dict in subAry) {
        subModel *model = [subModel mj_objectWithKeyValues:dict];
        [_subcategories addObject:model];
    }
}

@end

效果如下：

仅做记录！