Other ways to save an NSMutableArray in Xcode

Question

I receive an error when i try to save my NSMutableArray to the NSUserDefaults and I have read enough to understand that because my array is like this:

CustomClass *customObject;
NSMutableArray *mutArray = [[NSMutableArray alloc]initWithObjects:customObject,nil];

Because mutArray has a non-property-list object (customObject) it can't be saved neither onto the NSUserDefaults nor in a .plist file, so I need another way to save it.

possible duplicate of [Best way to save to nsuserdefaults for custom class?](http://stackoverflow.com/questions/3000220/best-way-to-save-to-nsuserdefaults-for-custom-class) — user1459524, Mar 05 '14 at 23:30

score 2 · Answer 1 · answered Mar 05 '14 at 23:17

2

Make CustomClass implement the < NSCoding > protocol, then archive the instance to data. Now you can add the data to the array / plist. Or save it to disk.

answered Mar 05 '14 at 23:17

Wain

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score 0 · Answer 2 · edited May 23 '17 at 10:26

When saving a mutable array (or dictionary) its 'mutability' shouldn't confuse you. You would save it as you would save its non-mutable sibling.

In order to make it mutable again when loading it you should load it and call mutableCopy on the loaded object. I know this is not your question at the moment but i have a feeling it will be soon.

To successfully save an array or dictionary all of the objects (their classes...) that container hold must conform to the <NSCoding> protocol. More on this here on SO.

Other ways to save an NSMutableArray in Xcode

2 Answers2