UIPickerView

最新推荐文章于 2023-11-29 21:06:11 发布

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最新推荐文章于 2023-11-29 21:06:11 发布

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分类专栏： ios 文章标签： UIPickerView

本文链接：https://blog.youkuaiyun.com/sunlihuo/article/details/45822615

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本文详细介绍了iOS开发中Swift编程语言的基础知识与实践应用，通过实例演示了如何使用Xcode构建高质量的应用程序。从变量与数据类型开始，逐步深入到控制流程、函数、类与继承等核心概念，最终通过实际项目案例，展示了如何将理论知识应用于实际开发中。

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//
//  ViewController.m
//  MyPickerView
//
//  Created by sunlihuo on 15/5/18.
//  Copyright (c) 2015年 sunlihuo. All rights reserved.
//

#import "ViewController.h"

@interface ViewController ()
@property (strong, nonatomic) UIPickerView *pickerView;//选取器视图
//@property (strong, nonatomic) NSArray *listData;//选取器的数据源

@property (strong, nonatomic) NSArray *provinces;//省份数据源数组
@property (strong, nonatomic) NSArray *cities;//城市数据源数组
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    //self.listData = @[@"row1", @"row2", @"row3", @"row4", @"row5"];
    [self onCreate];
}

- (void)onCreate{
    NSString *filePath = [[NSBundle mainBundle]pathForResource:@"area" ofType:@"plist"];
    self.provinces = [[NSArray alloc]initWithContentsOfFile:filePath];
    self.cities = self.provinces[0][@"Cities"];
    //NSLog(@"provinces is %@", self.provinces);
    //NSLog(@"cities is %@", self.cities);
    

    self.pickerView = [[UIPickerView alloc]initWithFrame:CGRectMake(0, 318, 320, 162)];
    self.pickerView.dataSource = self;
    self.pickerView.delegate = self;
    [self.view addSubview:self.pickerView];
    
    
}
- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
}

#pragma mark 选取器视图的数据类方法
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{
    //此数据源方法指定选取器有几个表盘
    return 2;
}


#pragma mark 选取器视图的委托方法
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{
    //此数据源方法指定选取器每个表盘有几行数据
    //NSLog(@"$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ is %zi", component);
    NSInteger cou = 0;
    switch (component) {
        case 0:
            cou = self.provinces.count;
            break;
        case 1:
            cou = self.cities.count;
            break;

        default:
            break;
    }
    return cou;
}

#pragma mark 此数据源方法指定选取器如何展示数据(此方法会被调用多次)
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{
    NSString *str = nil;
    switch (component) {
        case 0:
            str =  self.provinces[row][@"State"];
            break;
        case 1:
            str = self.cities[row][@"city"];
            break;

        default:
            break;
    }
    
    
    return str;
    
}

-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{
    switch (component) {
        case 0:
            self.cities = self.provinces[row][@"Cities"];
            //刷新UI
            [pickerView selectRow:0 inComponent:1 animated:YES];
            [pickerView reloadComponent:1];
            break;
            
        default:
            break;
    }
    
    
}
@end