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[操作系统]【代码笔记】时间选择框


一, 效果图。

二,工程图。

三,代码。

RootViewController.h

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#import <UIKit/UIKit.h>@interface RootViewController : UIViewController{  UIDatePicker *datePicker;  UILabel *timeLabel;}@end
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RootViewController.m

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#import "RootViewController.h"@interface RootViewController ()@end@implementation RootViewController- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{  self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];  if (self) {    // Custom initialization  }  return self;}- (void)viewDidLoad{  [super viewDidLoad];  // Do any additional setup after loading the view.    self.title=@"timerPicker";    timeLabel=[[UILabel alloc]init];  timeLabel.backgroundColor=[UIColor redColor];  timeLabel.frame=CGRectMake(10, 100, 300, 50);  timeLabel.textAlignment=NSTextAlignmentCenter;  [self.view addSubview:timeLabel];    }//点击任意处,弹出时间选择框-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{  datePicker = [[UIDatePicker alloc]initWithFrame:CGRectMake(0, self.view.frame.size.height-216, 0, 0)];  datePicker.datePickerMode = UIDatePickerModeDateAndTime;  [datePicker addTarget:self action:@selector(dateChanged:) forControlEvents:UIControlEventValueChanged ];  [self.view addSubview:datePicker];}//开始结束时间选择框- (void)dateChanged:(id)sender{  NSDate *date = datePicker.date;    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];  [dateFormatter setDateFormat:@"yyyy-MM-dd hh:mm"];  //设备默认的值  dateFormatter.locale=[NSLocale systemLocale];  //将所选择的时候转化为需要的时间格式  NSString *dateStr = [NSString stringWithFormat:@"%@",[dateFormatter stringFromDate:date]];  timeLabel.text=dateStr;    //让选择完时间后,选择框,消失,这个时间可以自己调整  [UIView animateWithDuration:.5f delay:.5f options:UIViewAnimationOptionCurveEaseInOut animations:^{    [datePicker setFrame:CGRectMake(0, self.view.frame.size.height, 0, 0)];  } completion:nil];}- (void)didReceiveMemoryWarning{  [super didReceiveMemoryWarning];  // Dispose of any resources that can be recreated.}
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