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#import <UIKit/UIKit.h>
@interface ViewController : UIViewController<UIPickerViewDataSource,UIPickerViewDelegate>
@property(strong,nonatomic)UIPickerView *pickView;
//定义一个可变数组用于存放省的数据
@property(strong,nonatomic)NSMutableArray *Statearry;
//定义一个可变数组用于存放市的数据
@property(strong,nonatomic)NSMutableArray *Citiesarry;
//定义一个集合分别存省和市的数据
@property(strong,nonatomic)NSArray *arry;
@end
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
//获取数据
NSString *path=[[NSBundle mainBundle] pathForResource:@"city" ofType:@"plist"];
//初始化省和市的数组
self.Statearry=[NSMutableArray array];
self.Citiesarry=[NSMutableArray array];
//ayyr这个大数组存放所有的省市
self.arry=[NSArray arrayWithContentsOfFile:path];
//获取省份的，将取出来的省份数据放在省的可变集合Statearry里
for (NSDictionary *arr in self.arry)
{
[self.Statearry addObject:arr[@"State"]];
}
//创建pickView
self.pickView=[[UIPickerView alloc] initWithFrame:CGRectMake(0, 200, 414, 200)];
self.pickView.backgroundColor=[UIColor grayColor];
self.pickView.delegate=self;
self.pickView.dataSource=self;
[self.view addSubview:self.pickView];
}
#pragma mark 数据源 Method numberOfComponentsInPickerView
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
//两列
return 2;
}
#pragma mark 数据源 Method pickerViewOfRows
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
if (component==0)
{
//省份的个数
return self.Statearry.count;
}
else
{
//市的个数
return self.Citiesarry.count;
}
}
#pragma mark delegate 显示信息的方法
-(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
if (component==0)
{
//选择的省份
return self.Statearry[row];
}
else
{
//选择的市
return self.Citiesarry[row];
}
}
#pragma mark 选中行的信息
-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
if (component==0)
{
//清空上一次市的那一列留下来的数据
[self.Citiesarry removeAllObjects];
//定义一个index，找出第一个滚动条里面的所有省对应的下标找出来，赋值给index
NSInteger index=[pickerView selectedRowInComponent:0];
//遍历出所有市
for (NSDictionary *city in self.arry[index][@"Cities"])
{
//将遍历出来市追加到存放市的集合里
[self.Citiesarry addObject:city[@"city"]];
}
// NSLog(@"%@",self.Citiesarry);
//更新第二个滚轮的数据
[self.pickView reloadComponent:1];
}
else
{
//显示取出来的省和市
NSString *message=[NSString stringWithFormat:@"你选择的是%@的%@?",self.Statearry[[pickerView selectedRowInComponent:0]],self.Citiesarry[row]];
//设置弹出框的标题
UIAlertController *alert=[UIAlertController alertControllerWithTitle:@"提示" message:message preferredStyle:UIAlertControllerStyleAlert];
//设置按钮名称
UIAlertAction *okAction=[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
}];
//设置按钮名称
UIAlertAction *cancelAction=[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil];
//将按钮加到提示框里面
[alert addAction:okAction];
[alert addAction:cancelAction];
//
[self presentViewController:alert animated:YES completion:nil];
}
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
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原文地址：http://www.cnblogs.com/layios/p/5270277.html
