UIPickerView多列依赖列表互动示例

在storyboard中拖一个Picker View控件进来，属性保持默认。并给它定义一个变量pickerView1

头文件

////  PickerViewController.h//  UIViewDemo////  Created by dcr on 2016/12/27.//  Copyright © 2016年. All rights reserved.//#import <UIKit/UIKit.h>@interface PickerViewController : UIViewController <UIPickerViewDataSource, UIPickerViewDelegate>@end

实现文件

////  PickerViewController.m//  UIViewDemo////  Created by dcr on 2016/12/27.//  Copyright © 2016年. All rights reserved.//#import "PickerViewController.h"@interface PickerViewController ()@property (weak, nonatomic) IBOutlet UIPickerView *pickerView1;@property (strong, nonatomic) NSArray *province;@property (strong, nonatomic) NSArray *guangdong;@property (strong, nonatomic) NSArray *jiangxi;@property (strong, nonatomic) NSArray *guangxi;@property (strong, nonatomic) NSArray *hunan;@property (strong, nonatomic) NSDictionary *citys;@property (strong, nonatomic) NSString *selectIndex;@end@implementation PickerViewController //设置列数- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{    return 2;}//设置每列行数- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{    if(component == 0){        return _province.count;    }else{        return [[_citys objectForKey:_selectIndex] count];    }}- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view.    _province = [[NSArray alloc] initWithObjects:@"广东省", @"江西省", @"广西省", @"湖南省", nil];    _guangdong = [[NSArray alloc] initWithObjects:@"茂名市", @"广州市", @"深圳市", @"惠州市", @"东莞市", @"中山市", nil];    _jiangxi = [[NSArray alloc] initWithObjects:@"南昌市", @"九江市", @"吉安市", @"赣州市", nil];    _guangxi = [[NSArray alloc] initWithObjects:@"桂林市", @"梧州市", @"北海市", @"南宁市", nil];    _hunan = [[NSArray alloc] initWithObjects:@"长沙市", @"常德市", @"株洲市", @"湘潭市", @"邵阳市", @"娄底市", nil];    _citys = [[NSDictionary alloc] initWithObjects:[NSArray arrayWithObjects:_guangdong, _jiangxi, _guangxi, _hunan, nil] forKeys:[NSArray arrayWithObjects:@"广东省", @"江西省", @"广西省", @"湖南省", nil]];        _selectIndex = @"广东省";    //设置协议代理    _pickerView1.delegate = self;    _pickerView1.dataSource = self;}//显示值- (nullable NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{    if(component == 0){        return [_province objectAtIndex:row];    }else{        return [[_citys objectForKey:_selectIndex] objectAtIndex:row];    }}//选择事件- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{    if(component == 0){        NSLog(@"_province = %@", [_province objectAtIndex:row]);        _selectIndex = [_province objectAtIndex:row];        //加载第二列数据        [_pickerView1 reloadComponent:1];        //恢复第二列第一个        [_pickerView1 selectRow:0 inComponent:1 animated:true];    }else{        NSLog(@"_city = %@", [[_citys objectForKey:_selectIndex] objectAtIndex:row]);    }}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}/*#pragma mark - Navigation// In a storyboard-based application, you will often want to do a little preparation before navigation- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {    // Get the new view controller using [segue destinationViewController].    // Pass the selected object to the new view controller.}*/@end

实现效果

示例下载地址：http://download.csdn.net/detail/deng0zhaotai/9724310