How to save an NSMutableArray containing NSMutableArrays of custom objects in NSUserDefaults

Question

I was able to save an NSMutableArray of custom objects to NSUserDefaults by implementing NSCoding in the custom class. However, now I want to save an NSMutableArray of these arrays. The compiler complains when I try to do this. How can this be done?

Take a look at this question: stackoverflow.com/questions/471830/… — Nick Moore
– Nick Moore, Commented Oct 13, 2010 at 19:47

node ninja · Accepted Answer · 2010-10-14 22:43:53Z

1

I found out how to do it. Basically, your transform the array into a data object using NSKeyedArchiver, and that is what you save with NSUserDefaults. Then when you get the data object back, you use NSKeyedUnarchiver to turn it back into an array.

answered Oct 14, 2010 at 22:43

node ninja

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2 Comments

Rafael Moreira Over a year ago

My problem is: can you turn it back into a Mutable array, add stuff to it then save it back to NSUserDefaults??

Dan Rosenstark Over a year ago

@RafaelMoreira the thing is probably not mutable when you get it, but you can always do mutableCopy

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