CODEWITHSUNDEEP
iphoneobjective-cipadiostime
joshim5
joshim5

Reputation: 2255

How long since last time app was opened in iOS?

How can I tell the time from the last time my app was open? Can this still be monitored even my app is not running in the background?

Thanks.

Upvotes: 8

Views: 5661

Answers (2)

Jilouc
Jilouc

Reputation: 12714

Put something like

[[NSUserDefaults standardUserDefaults] setObject:[NSDate date] forKey:@"kLastCloseDate"];

in both

- (void)applicationWillTerminate:(UIApplication *)application
- (void)applicationDidEnterBackground:(UIApplication *)application

Then check the difference at startup:

NSDate *lastDate = [[NSUserDefaults standardUserDefaults] objectForKey:@"kLastCloseDate"];
NSTimeInterval timeDiff = [[NSDate date] timeIntervalSinceDate:lastDate];
// your stuff

in both

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
- (void)applicationWillEnterForeground:(UIApplication *)application

Upvotes: 19

Adam Wright
Adam Wright

Reputation: 49386

In your application delegates - (void)applicationDidEnterBackground:(UIApplication *)application method, just write the current time to a file. Then, in either applicationWillEnterForeground: or applicationDidFinishLaunching, read this file and compare with the current time. The difference will tell you how long since your application was last foremost.

Upvotes: 1

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