iOS开发之pickerView 制作省份选择器

基本属性

1.UIPickerView的常见属性

// 数据源(用来告诉UIPickerView有多少列多少行)

@property(nonatomic,assign) id<UIPickerViewDataSource> dataSource;

// 代理(用来告诉UIPickerView每1列的每1行显示什么内容,监听UIPickerView的选择)

@property(nonatomic,assign) id<UIPickerViewDelegate>   delegate;

// 是否要显示选中的指示器

@property(nonatomic)        BOOL                       showsSelectionIndicator;

// 一共有多少列

@property(nonatomic,readonly) NSInteger numberOfComponents;

2.UIPickerView的常见方法

// 重新刷新所有列

- (void)reloadAllComponents;

// 重新刷新第component列

- (void)reloadComponent:(NSInteger)component;

// 主动选中第component列的第row行

- (void)selectRow:(NSInteger)row inComponent:(NSInteger)component animated:(BOOL)animated;

// 获得第component列的当前选中的行号

- (NSInteger)selectedRowInComponent:(NSInteger)component;

3.数据源方法(UIPickerViewDataSource)

//  一共有多少列

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView;

//  第component列一共有多少行

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component;

4.代理方法(UIPickerViewDelegate)

//  第component列的宽度是多少

- (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component;

//  第component列的行高是多少

- (CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component;

//  第component列第row行显示什么文字

- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component;

//  第component列第row行显示怎样的view(内容)

- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view;

//  选中了pickerView的第component列第row行

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component;

代码示例：

mePickView.h

//
//  mePickView.h
//  cityPickerDemo
//
//  Created by 王龙 on 16/3/24.
//  Copyright © 2016年 Larry（Lawrence）. All rights reserved.
//

#import <UIKit/UIKit.h>

@class mePickView;
@protocol mePickViewDelegate <NSObject>

-(void)selectCity:(NSString *)city;
@end

@interface mePickView : UIView

@property(nonatomic, assign) id<mePickViewDelegate>delegate;

@end

mePickView.m

//
//  mePickView.m
//  cityPickerDemo
//
//  Created by 王龙 on 16/3/24.
//  Copyright © 2016年 Larry（Lawrence）. All rights reserved.
//

#import "mePickView.h"

@interface mePickView ()<UIPickerViewDataSource,UIPickerViewDelegate>
//数据
@property (nonatomic,strong) NSDictionary *pickerDic;
@property (nonatomic,strong) NSArray *provinceArray;
@property (nonatomic,strong) NSArray *cityArray;
@property (nonatomic,strong) NSArray *townArray;
@property (nonatomic,strong) NSArray *selectedArray;

//视图
@property (nonatomic,strong) UIPickerView *pickerView;

@end


@implementation mePickView

- (instancetype)initWithFrame:(CGRect)frame{
    self = [super initWithFrame:frame];
    if (self) {
        [self getPickerData];
        [self addView];
    }
    return self;
}

//初始化视图
-(void)addView{
    _pickerView = [[UIPickerView alloc] initWithFrame:CGRectMake(0, 0, self.bounds.size.width, self.bounds.size.height-35)];
    _pickerView.delegate = self;
    _pickerView.dataSource = self;
    [self addSubview:_pickerView];
    
    UIButton * button = [UIButton buttonWithType:UIButtonTypeCustom];
    button.frame = CGRectMake(0, CGRectGetMaxY(_pickerView.frame), self.bounds.size.width, 35);
    [button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    button.backgroundColor = [UIColor cyanColor];
    [button setTitle:@"确定" forState:UIControlStateNormal];
    [button addTarget:self action:@selector(selectjia) forControlEvents:UIControlEventTouchUpInside];
    [self addSubview:button];
}

//选择城市
-(void)selectjia{
    NSLog(@"城市 == %@%@%@",[self.provinceArray objectAtIndex:[self.pickerView selectedRowInComponent:0]],[self.cityArray objectAtIndex:[self.pickerView selectedRowInComponent:1]],[self.townArray objectAtIndex:[self.pickerView selectedRowInComponent:2]]);
    NSString * city = [NSString stringWithFormat:@"%@%@%@",[self.provinceArray objectAtIndex:[self.pickerView selectedRowInComponent:0]],[self.cityArray objectAtIndex:[self.pickerView selectedRowInComponent:1]],[self.townArray objectAtIndex:[self.pickerView selectedRowInComponent:2]]];
    [self.delegate selectCity:city];
}


- (void)getPickerData{
    
    NSString *path = [[NSBundle mainBundle]pathForResource:@"Address" ofType:@"plist"];
    self.pickerDic = [[NSDictionary alloc]initWithContentsOfFile:path];
    self.provinceArray = [self.pickerDic allKeys];
    self.selectedArray = [self.pickerDic objectForKey:[[self.pickerDic allKeys] objectAtIndex:0]];
    if (self.selectedArray.count > 0) {
        self.cityArray = [[self.selectedArray objectAtIndex:0] allKeys];
    }
    if (self.cityArray.count > 0) {
        self.townArray = [[self.selectedArray objectAtIndex:0] objectForKey:[self.cityArray objectAtIndex:0]];
    }
    
}

//列数
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{
    return 3;
}

//每列的个数
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{
    if (component == 0) {
        return self.provinceArray.count;
    }else if (component == 1){
        return self.cityArray.count;
    }else{
        return self.townArray.count;
    }
}

//返回当前行的内容 此处是将数组中的值添加上去
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{
    if (component == 0) {
        return [self.provinceArray objectAtIndex:row];
    }else if (component == 1){
        return [self.cityArray objectAtIndex:row];
    }else{
        return [self.townArray objectAtIndex:row];
    }
}

//每列的宽度
- (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component{
    if (component == 0) {
        return 110;
    }else if (component == 1){
        return 100;
    }else{
        return 110;
    }
}


//返回选中的行
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
    
    if (component == 0) {
        self.selectedArray = [self.pickerDic objectForKey:[self.provinceArray objectAtIndex:row]];
        if (self.selectedArray.count > 0) {
            self.cityArray = [[self.selectedArray objectAtIndex:0] allKeys];
        } else {
            self.cityArray = nil;
        }
        if (self.cityArray.count > 0) {
            self.townArray = [[self.selectedArray objectAtIndex:0] objectForKey:[self.cityArray objectAtIndex:0]];
        } else {
            self.townArray = nil;
        }
    }
    [pickerView selectedRowInComponent:1];
    [pickerView reloadComponent:1];
    [pickerView selectedRowInComponent:2];
    
    if (component == 1) {
        if (self.selectedArray.count > 0 && self.cityArray.count > 0) {
            self.townArray = [[self.selectedArray objectAtIndex:0] objectForKey:[self.cityArray objectAtIndex:row]];
        } else {
            self.townArray = nil;
        }
        [pickerView selectRow:1 inComponent:2 animated:YES];
    }
    
    [pickerView reloadComponent:2];
    
}

@end

ViewController.h 不写东西

ViewController.m

//
//  ViewController.m
//  cityPickerDemo
//
//  Created by 王龙 on 16/3/24.
//  Copyright © 2016年 Larry（Lawrence）. All rights reserved.
//

#import "ViewController.h"
#import "mePickView.h"
@interface ViewController ()<mePickViewDelegate>
@property(nonatomic, weak)UILabel * label;
@property(nonatomic, strong)mePickView * pickView;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    UILabel * label = [[UILabel alloc] initWithFrame:CGRectMake(00,120, self.view.bounds.size.width, 45)];
    label.backgroundColor = [UIColor orangeColor];
    label.textAlignment = NSTextAlignmentCenter;
    self.label = label;
    [self. view addSubview:label];
    
    _pickView = [[mePickView alloc] initWithFrame:CGRectMake(0, CGRectGetMaxY(label.frame)+10, self.view.bounds.size.width, 180)];
    _pickView.backgroundColor = [UIColor greenColor];
    _pickView.delegate = self;
    [self.view addSubview:_pickView];
    
}

-(void)selectCity:(NSString *)city{
    self.label.text = city;
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end
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原文地址：https://www.cnblogs.com/ios-wanglong/p/5314956.html