将当前时间放入标签 [英] Putting current time into label

问题描述

我试图获取日期和时间使用日期，但是当我运行应用程序时，首次执行应用程序的时间和日期在短时间内不会更改。

  NSDate * StrDate = [NSDate date]; 
 NSDateFormatter * Dateformat = [[NSDateFormatter alloc] init]; 
 [Dateformat setDateFormat：@DD-MM-YYYY]; 
 NSMutableString * DateStr = [Dateformat stringFromDate：StrDate]; 
 [UserCntrl.timeDisplay setText：DateStr]; 
 [Dateformat setDateFormat：@HH：MM]; 
 NSMutableString * timeStr = [Dateformat stringFromDate：StrDate]; 
  

解决方案

在你的uiview中放置一个计划的定时器显示（或没有加载）方法：

  [NSTimer scheduledTimerWithTimeInterval：1.0f // 1秒
 target：self 
选择器：@selector（updateTime :) 
 userInfo：nil 
重复：YES]; 
  

然后，将此方法放在View Controller中：

$ b $ （void）updateTime：（id）sender
{
NSDate * StrDate = [NSDate date]; b

  
 NSDateFormatter * Dateformat = [[NSDateFormatter alloc] init]; 
 [Dateformat setDateFormat：@DD-MM-YYYY HH：mm：SS]; 
 NSMutableString * DateStr = [Dateformat stringFromDate：StrDate]; 
 [UserCntrl.timeDisplay setText：DateStr]; //或任何代码更新您的计时器。我没有检查这个bug。 
} 
  

这将一次调用updateTime：方法，更新控制器。

Ii am trying to get date and time using date but when i run application it takes first time executed application time and date in short time is not changed.

NSDate *StrDate = [NSDate date];
        NSDateFormatter *Dateformat = [[NSDateFormatter alloc]init];
        [Dateformat setDateFormat:@"DD-MM-YYYY"];
        NSMutableString *DateStr = [Dateformat stringFromDate:StrDate];
        [UserCntrl.timeDisplay setText:DateStr];
        [Dateformat setDateFormat:@"HH:MM"];
        NSMutableString *timeStr=[Dateformat stringFromDate:StrDate];

解决方案

Place a scheduled timer in your uiview did show (or did load) method:

[NSTimer scheduledTimerWithTimeInterval:1.0f // 1 second
    target:self
    selector:@selector(updateTime:) 
    userInfo:nil
    repeats:YES];

Then, put this method in your View Controller:

- (void) updateTime:(id)sender
{
    NSDate *StrDate = [NSDate date];
        NSDateFormatter *Dateformat = [[NSDateFormatter alloc]init];
        [Dateformat setDateFormat:@"DD-MM-YYYY HH:mm:SS"];
        NSMutableString *DateStr = [Dateformat stringFromDate:StrDate];
        [UserCntrl.timeDisplay setText:DateStr]; // or whatever code updates your timer.  I didn't check this for bugs.
}

This will call the "updateTime:" method once a second, updating your controller.

这篇关于将当前时间放入标签的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！