IOS下省市区选择器实现[基于TableView]

最近做的IOS项目中，要用到好几处地方要用到选择器。比如说很常用的地区选择器（省市区），在android平台下已经实现了自定义一个Dialog。但是对IOS并不太熟悉，去网上下载了一些例子，大多是用PickerView，然后省市区分三列，如：

这样的效果也不错，只是有些时候区名太长，就看不到了，而且没有按钮可以点。还有一个就是不能自己输入地址。

衡量了一下，还是决定自己实现，最后的效果图如下：

用户可以自己输入：

看看源代码吧。

先是头文件：

//
//  NerveAreaSelectorViewController.h
//
//	省市区三级选择器，可以自己输入
//	
//  Created by 集成显卡 on 13-5-17.
//  Copyright (c) 2013年 集成显卡 zxingming@qq.com . All rights reserved.
//

#import <UIKit/UIKit.h>

typedef enum {
    PROVINCE,
    CITY,
    AREA
} NerveSelectoreType;

//
//选择器协议，在调用的ViewController中实现此协议即可
//
@protocol NerveAreaSelectDelegate <NSObject>

@optional
- (void)onAreaSelect:(NSString *)selectValue;
- (void)onAreaCannel;
@end

@interface NerveAreaSelectorViewController : UIViewController <UITableViewDataSource, UITableViewDelegate>{
    
    NSArray *provinces, *cities, *areas;
    NSString *province, *city, *area;
    
    NSInteger selectType;//当前的选择类型，省，市，区
    
    id<NerveAreaSelectDelegate> delegate;
}

@property (weak, nonatomic) IBOutlet UITextField *areaTX;
@property (weak, nonatomic) IBOutlet UITableView *areaTableView;


//
//初始化数据
//
-(id) initWithDelegate:(id<NerveAreaSelectDelegate>) targetDelegate;

//
//确定按钮点击事件
//
- (IBAction)onOkBtnClick:(id)sender;

//
//取消按钮点击事件
//
- (IBAction)okCannelBtnClick:(id)sender;

//
//隐藏键盘用的
//
- (IBAction)exitInput:(id)sender;

@end

然后是具体实现类，这里主要讲一些主要的方法。

读取数据方法：

-(id)initWithDelegate:(id<NerveAreaSelectDelegate>)targetDelegate{
    delegate = targetDelegate;
    
    [self readData];
    
    selectType = PROVINCE;
    self.navigationController.navigationBarHidden = NO;
    self.title = @"ssss";
    
    
    UIBarButtonItem* leftB = [[UIBarButtonItem alloc] init];
    leftB.title = @"ss";
    self.navigationItem.backBarButtonItem = leftB;
    
    return self;
}

显示tableCell的方法：

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    int index = [indexPath row];
    //int section = [indexPath section];
    static NSString* CustomCellIdentifier = @"NerveAreaSelectorCell";
    
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CustomCellIdentifier];
    
    if(cell == nil){
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CustomCellIdentifier];
    }
    
    switch (selectType) {
        case PROVINCE:
            cell.textLabel.text = [[provinces objectAtIndex:index]
                                   objectForKey:@"state"];
            cell.accessoryType = UITableViewCellAccessoryDetailDisclosureButton;
            break;
        case CITY:
            cell.textLabel.text = [[cities objectAtIndex:index]
                                   objectForKey:@"city"];
            cell.accessoryType = UITableViewCellAccessoryDetailDisclosureButton;
            break;
        default:
            cell.textLabel.text = [areas objectAtIndex:index];
            cell.accessoryType = UITableViewCellAccessoryNone;
            break;
    }
    
    return cell;
}

用户选择单元格时：

//表格被选择
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
    int selectIndex = [indexPath row];
    int cellCount = 0;
    switch (selectType) {
        case PROVINCE:
            province = [[provinces objectAtIndex:selectIndex] objectForKey:@"state"];
            cities = [[provinces objectAtIndex:selectIndex] objectForKey:@"cities"];
            
            selectType = CITY;
            cellCount = [cities count];
            break;
        case CITY:
            city = [[cities objectAtIndex:selectIndex] objectForKey:@"city"];
            areas = [[cities objectAtIndex:selectIndex] objectForKey:@"areas"];
            
            selectType = AREA;
            cellCount = [areas count];
            break;
        default:
            area = [areas objectAtIndex:selectIndex];
            break;
    }
    
    NSString* areaValue = [NSString stringWithFormat:@"%@ %@ %@",province, city,area];
    NSLog(@"select=%@", areaValue);
    
    self.areaTX.text = areaValue;
    
    [areaTableView reloadData];
    
    if(cellCount > 0){
        NSIndexPath* topIndexPath = [NSIndexPath indexPathForRow:0 inSection:indexPath.section];
        [areaTableView scrollToRowAtIndexPath:topIndexPath atScrollPosition:UITableViewScrollPositionTop animated:YES];
    }
}

确定按钮被点击：

- (IBAction)onOkBtnClick:(id)sender {
    NSLog(@"OK click");
    [delegate onAreaSelect:areaTX.text];
}

源代码下载：http://download.csdn.net/detail/ssrc0604hx/5396627