iOS出生日期时间选择器、倒计时，籍贯选择器

出生日期时间选择器、倒计时。datePickerMode自己去改就可以了，很简单，上代码了
我还自己写了一个籍贯的选择器，plist文件，自己去找
或者去github上，下载我的demo
附上链接
demo链接

//  ViewController.m//  UIDatePicker////  Created by 易云时代 on 2017/8/21.//  Copyright © 2017年 笑伟. All rights reserved.//#import "ViewController.h"#import <Foundation/NSObject.h>@interface ViewController ()<UIPickerViewDelegate,UIPickerViewDataSource>@property (nonatomic, strong) UIDatePicker *picker;//日期选择器@property (nonatomic, strong) UILabel *label;//显示日期@property (nonatomic, strong) UIPickerView *pickerView;@property (nonatomic, strong) NSDictionary *dataSource;//数据源@property (nonatomic, strong) NSArray *provArr;//省@property (nonatomic, strong) NSArray *cityArr;//市@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    /*日期选择器*/    _picker = [[UIDatePicker alloc]initWithFrame:CGRectMake(0, 0, 300, 160)];//选择器初始化    _picker.locale = [NSLocale localeWithLocaleIdentifier:@"zh-hans"];//简体中文    _picker.datePickerMode = UIDatePickerModeDate;//日期的模式    [self.view addSubview:_picker];    _label = [[UILabel alloc]initWithFrame:CGRectMake(0, 180, 300, 30)];    _label.layer.borderWidth = 1;    _label.text = @"时间";    _label.textAlignment = NSTextAlignmentCenter;    [self.view addSubview:_label];    UIButton *button = [[UIButton alloc]initWithFrame:CGRectMake(0, 220, 100, 30)];    [button setTitle:@"Click" forState:UIControlStateNormal];    button.backgroundColor = [UIColor redColor];    [button addTarget:self action:@selector(onClick:) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:button];    /*籍贯选择器*/    _pickerView = [[UIPickerView alloc]initWithFrame:CGRectMake(0, 260, 300, 160)];    _pickerView.delegate = self;    _pickerView.dataSource = self;    [self.view addSubview:_pickerView];    //获取数据    NSString *plistPath = [[NSBundle mainBundle] pathForResource:@"ProvinceList" ofType:@"plist"];    NSDictionary *dic = [[NSDictionary alloc]initWithContentsOfFile:plistPath];    _dataSource = dic;    _provArr = [_dataSource allKeys];    //默认第一个    NSString *seledPrvo = [_provArr objectAtIndex:0];    _cityArr = [_dataSource objectForKey:seledPrvo];}-(void)onClick:(id)sender{    NSDate *date = _picker.date;    NSDateFormatter *matter = [[NSDateFormatter alloc]init];    matter.dateFormat = @"YYYY-MM-dd HH:mm:ss";    _label.text = [matter stringFromDate:date];}#pragma mark UIpickerViewDataSource-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{    return 2;}-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{    if(component == 0){//省        return _provArr.count;    }else{//市        return _cityArr.count;    }}#pragma mark UIpickerViewDelegate-(NSString*)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{    if (component == 0) {//省份        return [_provArr objectAtIndex:row];    }else{//城市        return [_cityArr objectAtIndex:row];    }}-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{    if (component == 0) {        NSString *selectedProv = [_provArr objectAtIndex:row];        NSArray *arr = [_dataSource objectForKey:selectedProv];        _cityArr = arr;        [_pickerView reloadComponent:1];    }}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}@end