Timer since a user is logged on in Xcode

Question

The problem is as follows: I have the time (in hh:mm:ss) when a user logs into the app. Now I have to implement a clock from that "log-in" time to the current time. This should be updated every second in the display. As an example: Say, the user logs in at 09:00:00 and the current time is 10:00:00. Then , the display should say 01:00:00 -> 01:00:01 -> 01:00:02 -> ...... So, the display is updated every second.

I am new to Xcode and objective C. Could you please suggest some approach? Thank You

I don't think Xcode can tell you the time. Did you mean to do this in your *iOS app?* — , Mar 05 '13 at 18:52

score 0 · Accepted Answer · answered Mar 05 '13 at 21:59

You can start and stop timer in app delegate methods like

application:willFinishLaunchingWithOptions, application:didFinishLaunchingWithOptions, applicationDidBecomeActive: applicationWillResignActive: applicationDidEnterBackground: applicationWillEnterForeground: applicationWillTerminate:

Refer to the following document for more info:

http://developer.apple.com/library/ios/#documentation/iphone/conceptual/iphoneosprogrammingguide/ManagingYourApplicationsFlow/ManagingYourApplicationsFlow.html

Timer since a user is logged on in Xcode

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