UIPickView的简单使用

好记性不如烂笔头，勤做笔记。

摘要：

1.UIPickVIew 几个重要的属性

　　（1）datePickerMode

UIDatePickerModeTime,           // Displays hour, minute, and optionally AM/PM designation depending on the locale setting (e.g. 6 | 53 | PM)
    UIDatePickerModeDate,           // Displays month, day, and year depending on the locale setting (e.g. November | 15 | 2007)
    UIDatePickerModeDateAndTime,    // Displays date, hour, minute, and optionally AM/PM designation depending on the locale setting (e.g. Wed Nov 15 | 6 | 53 | PM)
    UIDatePickerModeCountDownTimer

UIDatePickerModeTime：显示时分  还有上午下午 12小时制

UIDatePickerModeDate：显示年月日  12小时制

UIDatePickerModeDateAndTime：显示年月日时分 12小时制

UIDatePickerModeCountDownTimer：显示时分，24小时制

根据自己的需求选择相应的datePickerMode属性。

@property (nullable, nonatomic, strong) NSDate *minimumDate; // specify min/max date range. default is nil. When min > max, the values are ignored. Ignored in countdown timer mode
@property (nullable, nonatomic, strong) NSDate *maximumDate;

最大最小时间。限制了最大最小时间之后，此控件就可以自己会滚到设定的时间，不会在日期之前停留。

2.UIPickVIew 几个重要的方法

　　　　设置一个监听，用来监听pickVie的值的变化

[startPicker addTarget:self action:@selector(startPick:) forControlEvents:UIControlEventValueChanged];

3.使用汇总遇到的问题

　　选的时间存在8小时的时差解决方案

//获得的时间与本地的时间差8个小时
    NSDate *date=sender.date;

    NSDateFormatter *formatter=[[NSDateFormatter alloc]init];
    formatter.dateFormat=@"yy-MM-dd HH:mm:ss";

    //经过时间的格式化会变成本地时间
    NSString *timeStr=[formatter stringFromDate:date];

    NSLog(@"date-----%@",date);
    NSLog(@"timeStr-------%@",timeStr);

这样就可以解决了。

下边附上我写的demo的主要代码：

//
//  ViewController.m
//  demoUIDatePicker
//
//  Created by taoli on 2017/7/20.
//  Copyright © 2017年 XM. All rights reserved.
//

#import "ViewController.h"

@interface ViewController ()
{
    UIDatePicker *startPicker;
    UIDatePicker *endPicker;
}
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    startPicker = [[UIDatePicker alloc]initWithFrame:CGRectMake(, , [UIScreen mainScreen].bounds.size.width, )];
    startPicker.datePickerMode = UIDatePickerModeDateAndTime;
    NSDate *minDate = [[NSDate alloc]initWithTimeIntervalSinceNow:];
    startPicker.minimumDate = minDate;
    startPicker.backgroundColor = [UIColor yellowColor];
    [startPicker addTarget:self action:@selector(startPick:) forControlEvents:UIControlEventValueChanged];
    [self.view addSubview:startPicker];

    endPicker = [[UIDatePicker alloc]initWithFrame:CGRectMake(, , [UIScreen mainScreen].bounds.size.width, )];
    endPicker.datePickerMode = UIDatePickerModeTime;

    endPicker.minimumDate =startPicker.date;
    endPicker.backgroundColor = [UIColor yellowColor];
    [self.view addSubview:endPicker];

}
-(void)startPick:(UIDatePicker*)sender{

    //获得的时间与本地的时间差8个小时
    NSDate *date=sender.date;

    NSDateFormatter *formatter=[[NSDateFormatter alloc]init];
    formatter.dateFormat=@"yy-MM-dd HH:mm:ss";

    //经过时间的格式化会变成本地时间
    NSString *timeStr=[formatter stringFromDate:date];

    NSLog(@"date-----%@",date);
    NSLog(@"timeStr-------%@",timeStr);

//    NSTimeZone *timeZone=[NSTimeZone systemTimeZone];
//    NSInteger seconds=[timeZone secondsFromGMTForDate:date];
//    NSDate *newDate=[date dateByAddingTimeInterval:seconds];
//    NSString *newTimeStr=[formatter stringFromDate:newDate];
//    NSLog(@"newDate----%@",newDate);
//    NSLog(@"newTimeStr-------%@",newTimeStr);

//    NSLog(@"%@",sender.date);

    endPicker.minimumDate = sender.date;

}

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

@end

如发现问题，欢迎不吝赐教。

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