CODEWITHSUNDEEP
iosiphonecocoa-touchios5xcode4.3
Alfred Angkasa
Alfred Angkasa

Reputation: 1401

is that possible to know my apps is first time run or not in xcode?

i create an apps that i want to prompt an message for the user.. maybe using UIAlertview. After that, if the user run the apps for the second time, the alert won't prompt up anymore.

is that possible? honestly i don't have any idea about how to doing this. Any idea? I search on STO, actually this link, still confused.

what is NSUserDefaults? How can NSUserDefaults store this information? i mean this is my first time or second time.

thanks.

Upvotes: 2

Views: 3181

Answers (5)

Nicola Miotto
Nicola Miotto

Reputation: 3696

To know what's NSUserDefaults, I suggest to take a look the official doc.

And of course you can use it to fulfill your goal. You use a user default to store information about the current amount of runs in the app.

More or less like:

BOOL isRunMoreThanOnce = [[NSUserDefaults standardUserDefaults] boolForKey:@"isRunMoreThanOnce"];
if(!isRunMoreThanOnce){
    // Show the alert view
    // Then set the first run flag
    [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"isRunMoreThanOnce"];
    [[NSUserDefaults standardUserDefaults] synchronize];
}

Upvotes: 7

JiteshW
JiteshW

Reputation: 2205

Yes, U can save a value in NSUserDefault for the first time in your app & set it some other value once you open the app.

like 

if(![[NSUserDefault standardUserDefault] objectforKey:@"AppOpenFirstTime"])
{
// App Open First time 
// Show Alert
[[NSUserDefault standardUserDefault] setObject:@"1" forKey:@"AppOpenFirstTime"]
}

Upvotes: 3

Mark Pervovskiy
Mark Pervovskiy

Reputation: 1123

You can check if you stored some value in NSUserDefaults

NSString *flag = [[NSUserDefaults standardUserDefaults] stringForKey:@"not_first_run"];
if (!flag) {
    //first run, do somethig
}

and then set it to some value

[[NSUserDefaults standardUserDefaults] setObject:@"just any string" forKey:@"not_first_run"];

NSUserDefaults is a key-value store saved between your application launches.

Upvotes: 2

Wolverine
Wolverine

Reputation: 4329

First Time when your application launch at that time boolForKey:@"AlreadyRan" is FALSE. after that set it TRUE.

if(![[NSUserDefaults standardUserDefaults] boolForKey:@"AlreadyRan"] ) 
 {
    [[NSUserDefaults standardUserDefaults] setBool:TRUE forKey:@"AlreadyRan"];       
 }

With the NSUserDefaults class, you can save settings and properties related to application or user data.

The objects will be saved in what is known as the iOS “defaults system”. 
The iOS defaults system is available throughout all of the code in your app, and any data saved to the defaults system will persist through application sessions.This means that even if the user closes your application or reboots their phone, the saved data will still be available the next time they open the app!

Upvotes: 1

Mikael
Mikael

Reputation: 3612

You can do it exactly as cortez said in your link. NSUserDefaults is written to disc, and will be created and accessed from your app.

See this link

Upvotes: 1

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