Best way to save data to iOS?

Question

In my application (iOS 5) I want to save data - I want to save debts. So its:

plus or minus money
the amount of money
and the name who has the debts (or the name where you have the debts)

But I don't how to save the data (NSUserdefaults,Core data, SQLLite)

Maybe you can tell me the best way to save them?

Thats user defined - so i can't know (could be only 4 - but also 300). Depends on the user. — H3rrVorr4g3nd, Jun 17 '12 at 15:33

score 11 · Accepted Answer · answered Jun 17 '12 at 16:20

The easiest way to store small amount of data on your device is to use NSUserDefaults. But only property lists could be saved in this way. A property list is a combination of objects of 6 types, NSNumber, NSString, NSArray, NSDictionary, NSDate, NSData. In your case it's easy to do. For example, to save a new debt record you can use following method:

#define DEBTS_LIST_KEY @"listOfAllDebts"
#define DEBTOR_NAME_KEY @"debtorName"
#define DEBT_AMOUNT_KEY @"amountOfDebt"

-(void) saveDebt:(CGFloat) debtAmount forName:(NSString *) debtorName
{
    // pointer to standart user defaults
    NSUserDefaults * defaults = [NSUserDefaults standardUserDefaults];
    // the mutalbe array of all debts
    NSMutableArray * alldebtRecords = [[defaults objectForKey:DEBTS_LIST_KEY] mutableCopy];
    // create new record
    // to save CGFloat you need to wrap it into NSNumber
    NSNumber * amount = [NSNumber numberWithFloat:debtAmount];

    NSDictionary * newRecord = [NSDictionary dictionaryWithObjects:[NSArray arrayWithObjects:amount,debtorName, nil] forKeys:[NSArray arrayWithObjects:DEBT_AMOUNT_KEY, DEBTOR_NAME_KEY, nil]];
    [alldebtRecords addObject:newRecord];
    [defaults setObject:alldebtRecords forKey:DEBTS_LIST_KEY];
    // do not forget to save changes
    [defaults synchronize];
}

To readList of debts you have read something similar.

But I recommend you to use core data. It's more flexible and you won't have to write all this code to manage your data (to edit existed records, or to delete them). You will be able to extend your model much easier, for example, when you want to save the date of the debt. This is the link to a good tutorial

Always thought about Core Data..but all the tutorials were a little bit hard to understand. But your link really helped me and I could implement Core data into my application now (really easy o.O). Thanks! :) — H3rrVorr4g3nd, Jun 17 '12 at 18:24
I'm new to Core Data and this tutorial was very useful for me too. I'm glad I could help. — Yarlik, Jun 17 '12 at 18:59

score 3 · Answer 2 · answered Jun 17 '12 at 16:10

If the quantity of records is user-defined, and will grow with app use, I suggest Core Data, which can be backed by SQLite. If you are working in a modern Xcode (i.e. Xcode 4), creating models is easy and graphical. If you have ever worked with ORM frameworks before, the interface for querying, etc. should be easy to grasp.

Search around for some tutorials, but be specific about finding tutorials that match your version of Xcode, as Core Data development has been changing a lot lately.

score 2 · Answer 3 · answered Jun 17 '12 at 16:01

Good and easy way is to create your own objects and serialize them using NSCodying and NSCopying

https://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Protocols/NSCopying_Protocol/Reference/Reference.html

https://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Protocols/NSCoding_Protocol/Reference/Reference.html

Best way to save data to iOS?

3 Answers3

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