#import "ViewController.h"
@interface ViewController ()<UIPickerViewDelegate,UIPickerViewDataSource>
@property (strong,nonatomic) UIPickerView *pickerView;
@property (strong,nonatomic) UILabel *label;
@property (strong,nonatomic) UIButton *button;
@property (strong,nonatomic) NSDictionary *pickerData;
@property (strong,nonatomic) NSArray *pickerDataProvinces;
@property (strong,nonatomic) NSArray *pickerDataCities;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
//获取列表文件所有数据
NSString *plistPath = [[NSBundle mainBundle]pathForResource:@"provinces_cities" ofType:@"plist"];
NSDictionary *dict =[[NSDictionary alloc]initWithContentsOfFile:plistPath];
self.pickerData = dict;
//省分名数据
self.pickerDataProvinces = [self.pickerData allKeys];
//第一个省所有市的数据
NSString *selectedProvince = [self.pickerDataProvinces objectAtIndex:0];
self.pickerDataCities = [self.pickerData objectForKey:selectedProvince];
CGRect screen = [[UIScreen mainScreen]bounds];
//pickerView
self.pickerView = [[UIPickerView alloc]initWithFrame:CGRectMake(screen.size.width/2-160, 0, 320, 162)];
[self.view addSubview:self.pickerView];
//label
self.label = [[UILabel alloc]initWithFrame:CGRectMake(screen.size.width/2-100, 273, 200, 21)];
self.label.text = @"label";
self.label.textAlignment = NSTextAlignmentCenter;
[self.view addSubview:self.label];
//button
self.button = [UIButton buttonWithType:UIButtonTypeSystem];
[self.button setTitle:@"button" forState:UIControlStateNormal];
self.button.frame = CGRectMake(screen.size.width/2-23, 374, 46, 30);
[self.button addTarget:self action:@selector(onclick:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:self.button];
//分配协议给实现对象
self.pickerView.dataSource = self;
self.pickerView.delegate = self;
}
-(void)onclick:(id)sender{
NSInteger row1 = [self.pickerView selectedRowInComponent:0];
NSInteger row2 = [self.pickerView selectedRowInComponent:1];
NSString* selected1 = [self.pickerDataProvinces objectAtIndex:row1];
NSString* selected2 = [self.pickerDataCities objectAtIndex:row2];
NSString* title = [[NSString alloc]initWithFormat:@"%@,%@",selected1,selected2];
self.label.text = title;
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark --实现协议UIPickerViewDataSource方法
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
return 2;
}
- (NSInteger)pickerView:(UIPickerView *)pickerView
numberOfRowsInComponent:(NSInteger)component {
if (component == 0) {//省份个数
return [self.pickerDataProvinces count];
} else {//市的个数
return [self.pickerDataCities count];
}
}
#pragma mark --实现协议UIPickerViewDelegate方法
-(NSString *)pickerView:(UIPickerView *)pickerView
titleForRow:(NSInteger)row forComponent:(NSInteger)component {
if (component == 0) {//选择省份名
return [self.pickerDataProvinces objectAtIndex:row];
} else {//选择市名
return [self.pickerDataCities objectAtIndex:row];
}
}
- (void)pickerView:(UIPickerView *)pickerView
didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
if (component == 0) {
NSString *seletedProvince = [self.pickerDataProvinces objectAtIndex:row];
NSArray *array = [self.pickerData objectForKey:seletedProvince];
self.pickerDataCities = array;
[self.pickerView reloadComponent:1];
}
}
@end
