IOS TableView实现省市联动

//
//  ViewController.m
//  doubleTable
//
//  Created by City--Online on 15/8/5.
//  Copyright (c) 2015年 City--Online. All rights reserved.
//

#import "ViewController.h"

@interface ViewController ()<UITableViewDataSource,UITableViewDelegate>

@property(nonatomic,strong) NSDictionary *dicData;

//第一个tableView选择的Index
@property (nonatomic,assign) int *firstIndex;


@end

@implementation ViewController


- (void)viewDidLoad {
    [super viewDidLoad];
    
    _firstIndex=0;
   
    _firstTable.delegate=self;
    _firstTable.dataSource=self;
    _firstTable.translatesAutoresizingMaskIntoConstraints = NO;
    _firstTable.tableFooterView=[[UIView alloc]initWithFrame:CGRectZero];
    
    
    
    _secondTable.delegate=self;
    _secondTable.dataSource=self;
    _secondTable.translatesAutoresizingMaskIntoConstraints = NO;
    _secondTable.tableFooterView=[[UIView alloc]initWithFrame:CGRectZero];
    
    _dicData=@{@"广东省":@[@"深圳",@"广州",@"东莞"],@"河南省":@[@"驻马店",@"周口",@"郑州"]};
    
  
    
    [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-0-[_firstTable]-0-[_secondTable(_firstTable)]-0-|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(_firstTable,_secondTable)]];
    [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-80-[_firstTable]-0-|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(_firstTable)]];
    [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-80-[_secondTable]-0-|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(_secondTable)]];

}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    if (tableView==_firstTable) {
        return _dicData.allKeys.count;
    }
    else if (tableView==_secondTable)
    {
        NSString *key=[_dicData.allKeys objectAtIndex:_firstIndex];
        NSArray *arr=[_dicData objectForKey:key];
        return arr.count;
    }
    return 0;
}



- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell=[tableView dequeueReusableCellWithIdentifier:@"Cell"];
    if (cell==nil) {
        cell=[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"Cell"];
    }
    
    if (tableView==_firstTable) {
        if (indexPath.row==_firstIndex) {
            cell.backgroundColor=[UIColor redColor];
        }
        else
        {
            cell.backgroundColor=[UIColor whiteColor];
        }
         cell.textLabel.text=[_dicData.allKeys objectAtIndex:indexPath.row];
    }
    else
    {
        cell.backgroundColor=[UIColor grayColor];
        NSString *key=[_dicData.allKeys objectAtIndex:_firstIndex];
        NSArray *arr=[_dicData objectForKey:key];
        cell.textLabel.text=[arr objectAtIndex:indexPath.row];
    }
   
    return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (tableView==_firstTable) {
        _firstIndex=indexPath.row;
        [_secondTable reloadData];
        [_firstTable reloadData];
    }
    else if (tableView==_secondTable)
    {
        NSLog(@"%ld  %ld",_firstIndex,indexPath.row);
    }
}
-(void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath
{
    if ([cell respondsToSelector:@selector(setSeparatorInset:)]) {
        [cell setSeparatorInset:UIEdgeInsetsZero];
    }
    
#ifdef __IPHONE_8_0
    if ([cell respondsToSelector:@selector(setLayoutMargins:)]) {
        [cell setLayoutMargins:UIEdgeInsetsZero];
    }
    
    if([cell respondsToSelector:@selector(setPreservesSuperviewLayoutMargins:)]){
        [cell setPreservesSuperviewLayoutMargins:NO];
    }
#endif
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end