IOS简单的选择器实现UIPickerView（省＋市＋区）

-(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]];
}
}

-(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]];
}
}

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

//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;
}

//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];
}
}