UIPickerView 的 多重选择

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#import "ViewController.h"

@interface ViewController (){

    //    储存第二个选取器

    NSArray *cityArr;

    NSArray *townArr;

}

@property (weak, nonatomic) IBOutlet UIPickerView *pickerView;

@property (nonatomic,strong) NSArray *provinces;

@property (nonatomic,strong) NSArray *citys;

@property (nonatomic,strong) NSArray *towns;

@property (nonatomic,strong) NSMutableDictionary *PC;

@property (nonatomic,strong) NSMutableDictionary *CT;

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    self.PC = [NSMutableDictionary dictionary];

    self.CT = [NSMutableDictionary dictionary];

    self.pickerView.delegate = self;

    self.pickerView.dataSource = self;

    self.provinces = @[@"山西省",@"江苏省",@"浙江省"];

    NSArray *arrSX = @[@"太原市",@"大同市",@"阳泉市",@"长治市",@"晋城市",@"朔州市"];

    NSArray *arrJS = @[@"南京市",@"无锡市",@"徐州市",@"常州市",@"苏州市"];

    NSArray *arrZJ = @[@"杭州市",@"宁波市",@"温州市",@"嘉兴市",@"湖州市",@"绍兴市",@"金华市",@"衢州市"];

    self.citys = @[arrSX, arrJS, arrZJ];

    for (int i = 0; i < self.provinces.count ; i++) {

        [self.PC addEntriesFromDictionary:@{self.provinces[i]:self.citys[i]}];

    }

    //    根据第一个滚轮中的值，选取第二个滚轮中的值

    NSString *selectedState = [self.provinces objectAtIndex:0];

    NSArray *array = [self.PC objectForKey:selectedState];

    cityArr = array;

//  山西县城

    NSArray *arrTY = @[@"太",@"太",@"太",@"太",@"太",@"原"];

    NSArray *arrDT = @[@"大",@"大",@"大",@"大",@"同"];

    NSArray *arrYQ = @[@"阳",@"阳",@"阳",@"泉"];

    NSArray *arrCZ = @[@"长",@"长",@"长",@"长",@"治"];

    NSArray *arrJC = @[@"晋",@"晋",@"晋",@"晋",@"城"];

    NSArray *arrSZ = @[@"朔",@"朔",@"朔",@"朔",@"朔",@"朔",@"州"];

    NSArray *arrSXT = @[arrTY,arrDT,arrYQ,arrCZ,arrJC,arrSZ];

//  江苏县城

    NSArray *arrNJ = @[@"南",@"南",@"南",@"南",@"京"];

    NSArray *arrWX = @[@"无",@"无",@"无",@"无",@"无",@"锡"];

    NSArray *arrXZ = @[@"徐",@"徐",@"徐",@"徐",@"徐",@"徐",@"徐",@"州"];

    NSArray *arrCHZ = @[@"常",@"常",@"常",@"州"];

    NSArray *arrSHZ = @[@"苏",@"苏",@"苏",@"苏",@"州"];

    NSArray *arrJST = @[arrNJ,arrWX,arrXZ,arrCHZ,arrSHZ];

//  浙江县城

    NSArray *arrHZ = @[@"杭",@"杭",@"杭",@"杭",@"州"];

    NSArray *arrNB = @[@"宁",@"宁",@"宁",@"波"];

    NSArray *arrWZ = @[@"温",@"温",@"温",@"温",@"温",@"州"];

    NSArray *arrJX = @[@"嘉",@"嘉",@"嘉",@"嘉",@"嘉",@"嘉",@"兴"];

    NSArray *arrHUZ = @[@"湖",@"湖",@"湖",@"湖",@"湖",@"湖",@"湖",@"州"];

    NSArray *arrSHX = @[@"绍",@"绍",@"绍",@"绍",@"绍",@"兴"];

    NSArray *arrJH = @[@"金",@"金",@"金",@"金",@"华"];

    NSArray *arrQZ = @[@"衢",@"衢",@"衢",@"衢",@"州"];

    NSArray *arrZJT = @[arrHZ,arrNB,arrWZ,arrJX,arrHUZ,arrSHX,arrJH,arrQZ];

    self.towns = @[arrSXT, arrJST, arrZJT];

    NSMutableArray *strArr = [NSMutableArray array];

    for (NSArray *arr in self.citys) {

        for (NSString *str in arr) {

            [strArr addObject:str];

        }

    }

    NSMutableArray *townAM = [NSMutableArray array];

    for (NSArray *arr in self.towns) {

        for (NSArray *arr1 in arr) {

            [townAM addObject:arr1];

        }

    }

    for (int i = 0; i < strArr.count ; i++) {

        [self.CT addEntriesFromDictionary:@{strArr[i]:townAM[i]}];

    }

    NSString *selectedState2 = [self.citys[0] objectAtIndex:0];

    NSArray *array2 = [self.CT objectForKey:selectedState2];

    townArr = array2;

}

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{

    return 3;

}

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{

    if (component == 0) {

        return self.provinces.count;

    }else if (component == 1) {

        return [cityArr count];

    }

    return [townArr count];

}

- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{

    if (component == 0) {

        return [self.provinces objectAtIndex:row];

    }else if (component == 1){

        return [cityArr objectAtIndex:row];

    }

    return [townArr objectAtIndex:row] ;

}

-(void)pickerView:(UIPickerView *)pickerViewt didSelectRow:(NSInteger)row inComponent:(NSInteger)component

{

    //    如果选取的是第一个选取器

    if (component == 0) {

        //        得到第一个选取器的当前行

        NSString *selectedState =[self.provinces objectAtIndex:row];

        //        根据从pickerDictionary字典中取出的值，选择对应第二个中的值

        NSArray *array = [self.PC objectForKey:selectedState];

        cityArr = array;

        [self.pickerView selectRow:0 inComponent:1 animated:YES];

        //        重新装载第二个滚轮中的值

        [self.pickerView reloadComponent:1];

    }else if (component == 1){

        //        得到第一个选取器的当前行

        NSString *selectedState1 =[cityArr objectAtIndex:row];

        //        根据从pickerDictionary字典中取出的值，选择对应第二个中的值

        NSArray *array = [self.CT objectForKey:selectedState1];

        townArr = array;

        [self.pickerView selectRow:1 inComponent:2 animated:YES];

        //        重新装载第二个滚轮中的值

        [self.pickerView reloadComponent:2];

    }

}

UIPickerView 的 多重选择

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原文地址：http://www.cnblogs.com/wugenbao/p/5648328.html