Re: NSWorkspace notifications related to time change
Re: NSWorkspace notifications related to time change
- Subject: Re: NSWorkspace notifications related to time change
- From: Carl Hoefs via Cocoa-dev <email@hidden>
- Date: Wed, 18 Dec 2019 10:55:04 -0700
> On Dec 18, 2019, at 10:25 AM, Steve Mills via Cocoa-dev
> <email@hidden> wrote:
>
>> On Dec 18, 2019, at 11:19, Carl Hoefs via Cocoa-dev
>> <email@hidden> wrote:
>>
>> I have a macOS daemon that uses NSTimers for scheduling user event
>> reminders.
>>
>> This works well except for abrupt time changes:
>> (1) the user explicitly changes the date/time
>> (2) the user crosses into a different time zone
>> (3) daylight saving time comes/goes.
>> Then I need to recalculate the timers based on the new current time.
>>
>> The Apple docs don't list any NSWorkspace notifications related to the
>> above.
>> How can I handle these cases?
>
> Look in a different header, one related to time; NSDate.h, where you’ll find
> NSSystemClockDidChangeNotification.
Thanks for the tip!
However, I cannot get this notification to fire on system time changes. My
other notifications (such as sleep wake, etc) do fire.
-Carl
[[[NSWorkspace sharedWorkspace] notificationCenter] addObserver: self
selector: @selector(systemTimeChanged:)
name: NSSystemClockDidChangeNotification object: NULL];
-(void) systemTimeChanged: (NSNotification *) notification
{
NSLog(@"-systemTimeChanged: %@", [notification name]);
}
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