省份、城市选择组件

组件要求：

　　1、能够选择中国的省份、城市

　　2、组件具有可扩展性，较好的复用性

效果：

具体实施：

　　1、类似于照片选择组件，第一个界面显示省份，第二个组件显示城市。

//
//  ViewController.m
//  CityPicker
//
//  Created by vousaimer on 15-1-23.
//  Copyright (c) 2015年 va. All rights reserved.
//

#import "ViewController.h"
#import "ProvinceViewController.h"

@interface ViewController ()<CityPickerProtocol>

@property (nonatomic, strong) UIButton *testButton;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    _testButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 100, 45)];
    [_testButton setTitle:@"cityPicker" forState:UIControlStateNormal];
    _testButton.backgroundColor = [UIColor greenColor];
    [self.view addSubview:_testButton];
    _testButton.center = self.view.center;
    [_testButton addTarget:self action:@selector(testCityPicker:)
          forControlEvents:UIControlEventTouchUpInside];

}

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

- (void)testCityPicker:(id)sender
{
    ProvinceViewController *vc = [[ProvinceViewController alloc] initWithNibName:nil bundle:nil];
    vc.delegate = self;
    [self presentViewController:[[UINavigationController alloc] initWithRootViewController:vc] animated:YES completion:^{

    }];
}

- (void)CityPickerDidCancel:(ProvinceViewController *)provinceVC
{
    [provinceVC dismissViewControllerAnimated:YES completion:^{

    }];
}

- (void)CityPickerDidChoose:(ProvinceViewController *)provinceVC
              withResultDic:(NSDictionary *)dic
{
    [provinceVC dismissViewControllerAnimated:YES completion:^{

        NSString *province = dic[@"Province"];
        NSString *city = dic[@"City"];

        NSLog(@"province = %@ , city = %@",province, city);

    }];
}

@end

　　第二个组件显示城市

//
//  CityViewController.m
//  CityPicker
//
//  Created by vousaimer on 15-1-24.
//  Copyright (c) 2015年 va. All rights reserved.
//

#import "CityViewController.h"

@interface CityViewController ()

@end

@implementation CityViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    self.tableView.separatorStyle = UITableViewCellSeparatorStyleSingleLine;
}

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

- (void)setCityArray:(NSArray *)cityArray
{
    _cityArray = cityArray;

    [[NSOperationQueue mainQueue] addOperationWithBlock:^{
        [self.tableView reloadData];
    }];
}

#pragma mark - Table view data source

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
    // Return the number of sections.
    return _cityArray.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"CityCell"];
    if(cell == nil)
    {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault
                                      reuseIdentifier:@"ProvinceCell"];
    }
    NSDictionary *dic = self.cityArray[indexPath.row];
    cell.textLabel.text = dic[@"name"];

    cell.accessoryType = UITableViewCellAccessoryNone;

    return cell;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    [tableView deselectRowAtIndexPath:indexPath animated:YES];

    if([self.delegate respondsToSelector:@selector(CityPickerDidChoose:withResultDic:)])
    {
        NSArray *vcArray = self.navigationController.viewControllers;

        [self.delegate CityPickerDidChoose:vcArray[vcArray.count -2]
                             withResultDic:@{@"City":self.cityArray[indexPath.row][@"name"],
                                             @"Province":self.Province}];
    }
}

@end