IOS简单的选择器实现UIPickerView（省＋市＋区）

轮子的样式：

area.plist的样式：

1.解析文件

1.1解析省

-(void)ProvinceArray
{
    
    //获取第一层Dictionary
    self.allDic = [[NSDictionary alloc]initWithContentsOfFile:[[NSBundle mainBundle]pathForResource:@"area" ofType:@"plist"]];
    self.provinceArray = [[NSMutableArray alloc]init];
    for(int i = 0; i < self.allDic.count; i++)
    {
        [self.provinceArray addObject:[[[self.allDic objectForKey:[NSString stringWithFormat:@"%d",i]] allKeys] objectAtIndex:0]];
    }
}

1.2解析市

-(void)CityArray:(NSInteger)row
{
    //获取第三层Dictionary
    self.province = [[self.allDic objectForKey:[NSString stringWithFormat:@"%ld",row]] objectForKey:self.provinceArray[row]];
    self.cityArray = [[NSMutableArray alloc]init];
    for(int i = 0;i < self.province.count; i++)
    {
        [self.cityArray addObject:[[[self.province objectForKey:[NSString stringWithFormat:@"%d",i]] allKeys] objectAtIndex:0]];
    }
}

1.3解析区

-(void)CountyArray:(NSInteger)row
{
    self.countyArray = [[NSMutableArray alloc]init];
    self.countyArray = [[self.province objectForKey:[NSString stringWithFormat:@"%ld",row]] objectForKey:self.cityArray[row]];
}

2.绑定并初始化UIPickerView

//以下3个方法实现PickerView的数据初始化
//确定picker的轮子个数
#pragma mark 实现协议UIPickerViewDataSource的方法
-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
    //设置几个滚轮
    return 3;
}
//确定picker的每个轮子的item数
-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
    switch (component) {
        case 0://省份个数
            return [self.provinceArray count];
            break;
        case 1://市的个数
            return [self.cityArray count];
            break;
        case 2://县的个数
            return [self.countyArray count];
            break;
        default:
            break;
    }
    return 0;
}
//确定每个轮子的每一项显示什么内容
#pragma mark 实现协议UIPickerViewDelegate的方法
-(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
    switch (component) {
        case 0://选择省份
            return [self.provinceArray objectAtIndex:row];
            break;
        case 1://选择市
            return [self.cityArray objectAtIndex:row];
            break;
        case 2://选择县
            return [self.countyArray objectAtIndex:row];
            break;
        default:
            break;
    }
    return 0;
}

3.监听轮子的滚动

//监听轮子的移动
-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
    if (component == 0) {
        [self CityArray:row];
        [self CountyArray:0];
        [self.pickerView reloadComponent:1];
        [self.pickerView reloadComponent:2];
    }
    if (component == 1) {
        [self CountyArray:row];
        [self.pickerView reloadComponent:2];
    }
}

程序代码+area.plist文件 http://files.cnblogs.com/files/guoyongzhi/PickerView.zip