//
// RootViewController.m
// 时间戳在走并且显示Demo
//
// Created by Dubai on 15/4/2.
// Copyright (c) 2015年 Dubai. All rights reserved.
//
#import "RootViewController.h"
@interface RootViewController ()
{
UILabel *labelTime;
NSTimer *timeNow;
}
@end
@implementation RootViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
self.view.backgroundColor = [UIColor orangeColor];
labelTime = [[UILabel alloc] initWithFrame:CGRectMake(60, 100, 200, 50)];
labelTime.backgroundColor = [UIColor redColor];
[self.view addSubview:labelTime];
timeNow = [NSTimer scheduledTimerWithTimeInterval:1.0f target:self selector:@selector(timerFunc) userInfo:nil repeats:YES];
//获取系统时间
NSDate * senddate=[NSDate date];
NSDateFormatter *dateformatter=[[NSDateFormatter alloc] init];
[dateformatter setDateFormat:@"HH:mm"];
NSString * locationString=[dateformatter stringFromDate:senddate];
NSLog(@"-------%@",locationString);
//获取系统时间
NSCalendar * cal=[NSCalendar currentCalendar];
NSUInteger unitFlags=NSDayCalendarUnit|NSMonthCalendarUnit|NSYearCalendarUnit;
NSDateComponents * conponent= [cal components:unitFlags fromDate:senddate];
NSInteger year=[conponent year];
NSInteger month=[conponent month];
NSInteger day=[conponent day];
NSString * nsDateString= [NSString stringWithFormat:@"%4d年%2d月%2d日",year,month,day];
NSLog(@"+++++++++++++%@",nsDateString);
}
- (void)timerFunc
{
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"MM/dd/YY HH:mm:ss"];
NSString *timestamp = [formatter stringFromDate:[NSDate date]];
[labelTime setText:timestamp];//时间在变化的语句
NSLog(@"%@",timestamp);
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
/*
#pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/
@end
原文：http://blog.csdn.net/zhaoguodongios/article/details/44829691