XCODE：如何从设备获取/验证ACCURATE时间戳 [英] XCODE: How to get/verify ACCURATE timestamp from device

问题描述

是否可以在没有互联网连接的情况下获取NTP或准确的时间戳？我不能/不信任[NSDate date]的设备时间戳，因为它可以由用户修改，我的应用程序将被黑客入侵，只需修改系统日期&时间。

除此之外，没有获得准确的时间戳，有没有办法检查系统日期已被用户更改或未设置为自动。 p>

谢谢&请问，如果你想收集当前的信息，那么请问如果你想收集当前的信息，日期相对于特定时区，您可以使用以下行：

  //创建日历
 NSCalendar * calendar = [NSCalendar currentCalendar]; 
 
 //设置日历时区
 [日历setTimeZone：[NSTimeZone timeZoneWithAbbreviation：@UTC]]; 
 
 //收集日期组件
 NSDateComponents * components = [日历组件：（NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit）fromDate：[NSDate date]]; 
  

这是一个有点复杂的，但在iOS上，NSDate似乎还是一个问题，关于日光这样节省了我很多时间（双关不是意图：P）。

Is it possible to get the NTP or accurate timestamp without internet connection? I cannot take/don't trust device timestamp with [NSDate date] as it can be modify by user and my apps will be hacked by just modifying the system date & time.

Apart from this, instead of obtain accurate timestamp, is there any way to check the system date has changed by user or not set as "Automatically".

Thanks & Regards,

Weng

解决方案

If you want to gather the current date in relation to a specific time zone, you can use something along the lines of:

    //create calendar
NSCalendar *calendar = [NSCalendar currentCalendar];

//set calendar time zone
[calendar setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]];

//gather date components
NSDateComponents *components = [calendar components:(NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit) fromDate:[NSDate date]];

It's a little convoluted, but there still seems to be an issue with NSDate on iOS with regards to daylight savings so this has saved me a lot of time ( pun not intended :P ).

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