iphone开发UI组件之UIDatePicker日期选择组件的预习

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为了省时间，直接上代码吧。

新建工程。

编辑控制器的.h文件如下：

//
//  ViewController.h
//  datepicker
//
//  Created by apple on 15/9/2.
//  Copyright (c) 2015年 LiuXun. All rights reserved.
//#import <UIKit/UIKit.h>@interface ViewController : UIViewController@property (nonatomic, strong) UIDatePicker *datePicker;
@property (nonatomic, strong) UILabel *dateLabel;
@end

编辑控制器的.m文件如下：

//
//  ViewController.m
//  datepicker
//
//  Created by apple on 15/9/2.
//  Copyright (c) 2015年 LiuXun. All rights reserved.
//#import "ViewController.h"
#define  WIDTH    [UIScreen mainScreen].bounds.size.width
#define  HEIGHT  [UIScreen mainScreen].bounds.size.height@interface ViewController ()@end@implementation ViewController-(NSDate *) stringToDate:(NSString *)timeStr
{NSDateFormatter *formatter = [[NSDateFormatter alloc] init];[formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];return [formatter dateFromString:timeStr];
}-(NSString *)dateToString:(NSDate *)timeDate
{NSDateFormatter *formatter = [[NSDateFormatter alloc]  init];[formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];return [formatter stringFromDate:timeDate];
}-(void)initDatePicker
{self.datePicker = [[UIDatePicker alloc] initWithFrame:CGRectMake(20, 20, (WIDTH-20)/2, (WIDTH-20)/2)];self.datePicker.datePickerMode = UIDatePickerModeDate;self.datePicker.minuteInterval = 5;self.datePicker.minimumDate = [self stringToDate:@"1990-01-01 00:00:00"];self.datePicker.maximumDate = [self stringToDate:@"2015-08-01 00:00:00"];self.datePicker.date = [NSDate date];[self.datePicker addTarget:self action:@selector(valueChanged:) forControlEvents:UIControlEventValueChanged];[self.view addSubview:self.datePicker];
}-(void) initDateLabel
{self.dateLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, (WIDTH-20)/2+30, WIDTH, 50)];self.dateLabel.textAlignment = NSTextAlignmentCenter;self.dateLabel.backgroundColor = [UIColor clearColor];self.dateLabel.font = [UIFont systemFontOfSize:21.0];[self.view addSubview:self.dateLabel];
}-(void) valueChanged:(UIDatePicker *)sender
{self.dateLabel.text = [self dateToString:sender.date];}- (void)viewDidLoad
{[super viewDidLoad];self.view.backgroundColor = [UIColor whiteColor];[self initDatePicker];[self initDateLabel];}- (void)didReceiveMemoryWarning
{[super didReceiveMemoryWarning];// Dispose of any resources that can be recreated.
}@end

运行结果如下：