Question

I am developing an iPhone application where I collect info from the user when he/she uses it for the first time. I store this in a singleton class as I need it throughout my app. Now I want this class to be persistent, as I don’t want to collect this information if the app is closed and started again. How can I save this class?

Answer 1

U may use :NSUserDefaults”
To write:

NSString* str = @"StringToSave";
NSArray *arr = [[NSArray alloc]initWithObjects: @"array", @"to", @"save",nil];
[[NSUserDefaults standardUserDefaults] setObject: str forKey:@"stringSetting"];
[[NSUserDefaults standardUserDefaults] setObject: arr forKey:@"this_is_array"];
[[NSUserDefaults standardUserDefaults] synchronize];

To read:

NSString* str = [[NSUserDefaults standardUserDefaults] objectForKey:@"stringSetting"];
NSArray *a = [[NSUserDefaults standardUserDefaults] objectForKey:@"this_is_array"];