UIPickerView 的 多重选择

#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];

}

}