iOS.UIKit.11.UIPickerView

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一、案例介紹：點擊UIButton，將選中的省市資訊顯示在UILabel中，01，02

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二、案例步驟：

1、選擇Simple View Aplication,取名cq.37.普通選取器，03

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2、Main.storyboard,04

3、provinces_cities.plist

4、CQ37ViewController.h

#import <UIKit/UIKit.h>@interface CQ37ViewController : UIViewController<UIPickerViewDataSource,UIPickerViewDelegate>@property (weak,nonatomic) IBOutlet UIPickerView *pickerView;@property (weak,nonatomic) IBOutlet UILabel *label;@property (strong,nonatomic) NSDictionary *pickerData;@property (strong,nonatomic) NSArray *pickerProvincesData;@property (strong,nonatomic) NSArray *pickerCitiesData;- (IBAction)onclick:(id)sender;@end

5、CQ37ViewController.m

#import "CQ37ViewController.h"@interface CQ37ViewController ()@end@implementation CQ37ViewController- (void)viewDidLoad{    [super viewDidLoad];        NSBundle *mainBundle = [NSBundle mainBundle];    NSString *plistPath = [mainBundle pathForResource:@"provinces_cities" ofType:@"plist"];        NSDictionary *dict = [[NSDictionary alloc] initWithContentsOfFile:plistPath];    self.pickerData = dict;        self.pickerProvincesData = [dict allKeys];        NSString *selectedProvince = [self.pickerProvincesData objectAtIndex:0];    self.pickerCitiesData = [self.pickerData objectForKey:selectedProvince];        self.pickerView.delegate = self;    self.pickerView.dataSource = self;}- (IBAction)onclick:(id)sender{    NSInteger row1 = [self.pickerView selectedRowInComponent:0];    NSInteger row2 = [self.pickerView selectedRowInComponent:1];        NSString *selected1 = [self.pickerProvincesData objectAtIndex:row1];    NSString *selected2 = [self.pickerCitiesData objectAtIndex:row2];        NSString *title = [[NSString alloc] initWithFormat:@"%@,%@",selected1,selected2];        self.label.text = title;}#pragma mark UIPickerViewDataSource method- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{    return 2;}- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{    if (component == 0) {        return [self.pickerProvincesData count];    }else{        return [self.pickerCitiesData count];    }}#pragma mark 實現協議UIPickerViewDelegate方法-(NSString *)pickerView:(UIPickerView *)pickerView            titleForRow:(NSInteger)row forComponent:(NSInteger)component {    if (component == 0) {//選擇省份名        return [self.pickerProvincesData objectAtIndex:row];    } else {//選擇市名        return [self.pickerCitiesData objectAtIndex:row];    }}- (void)pickerView:(UIPickerView *)pickerView      didSelectRow:(NSInteger)row inComponent:(NSInteger)component {    if (component == 0) {        NSString *seletedProvince = [self.pickerProvincesData objectAtIndex:row];        NSArray *array = [self.pickerData objectForKey:seletedProvince];        self.pickerCitiesData = array;        [self.pickerView reloadComponent:1];    }}@end