first time launch method?

sumosumo84 · 10-26-2010, 01:15 PM

is there a first time launch method that is called only the first time the app is opened. becuase i have to set some variables, but i want them to be able to change and not revert back to what i set them to.

i hope you understand

Thanks

kapps11 · 10-26-2010, 01:24 PM

I answered a post with this exact same question a while ago, see if you can find it :P

Basically, the idea was to create a plist. When you first run the app, the plist wont exist, so all of the variables you try to recieve will be nil, NO, etc. the best way was to make a bool and save it using NSUserDefaults. retrieve that when your view controller loads, and if it is NO, then that is the first time the app has been run. make sure you set it to yes later

sumosumo84 · 10-26-2010, 02:00 PM

ok but how do i set the BOOL to NO without having it be no again the second time it is launched

kapps11 · 10-26-2010, 02:43 PM

ok lets see here...
in your viewdidLoad, or wherever you want it

Code:

BOOL hasRunBefore = [[NSUserDefaults standardUserDefaults] boolForKey:@"FirstRun"];
if (hasRunBefore) {
****NOT the first time
}
else if (!hasRunBefore) {
****DO YOUR SETUP HERE
}

I think that should work. I wrote it off the top of my head (im not on my mac) so there may be some typos, but thats the idea

thomashw · 10-26-2010, 02:50 PM

Use NSUserDefaults to determine whether it's the first launch.

On first launch, simply set a bool (or something else if you prefer) using the setBool:forKey: method. If it doesn't exist yet when your app launches, you know it's the first launch.

kapps11 · 10-26-2010, 04:01 PM

exactly, im just too sleepy to articulate it lol

thomashw · 10-26-2010, 04:21 PM

Quote:

Originally Posted by kapps11

exactly, im just too sleepy to articulate it lol

Woops, I didn't even look at your post before I wrote mine.

sumosumo84 · 10-26-2010, 05:12 PM

ok thanks, i will see if these work and get back to you!

sumosumo84 · 10-26-2010, 05:26 PM

thanks guys so much, i will probably make a video on this because i am probably not the only one having trouble!

don't worry i will give you guys credit!

Son of a Beach · 10-26-2010, 08:02 PM

Rather than just saving a BOOL, I actually save that application bundle's version number string into defaults.

This provides some future proofing so that not only can you check if the app has been run before, you can check which version was last run. Sometimes this information is very useful indeed.