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。

用户可以自己输入：

 看看源代码吧。

先是头文件：

[cpp] 
//  
//  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 [e-mail] . 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 

//
//  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 [e-mail] . 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：

[cpp] 
-(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; 
} 

-(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：

[cpp] 
-(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; 
} 

-(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：

[cpp] 
//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]; 
    } 
} 

//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：

[cpp]
- (ibaction)onokbtnclick:(id)sender { 
    nslog(@"ok click"); 
    [delegate onareaselect:areatx.text]; 
} 

- (ibaction)onokbtnclick:(id)sender {
    nslog(@"ok click");
    [delegate onareaselect:areatx.text];
}