Saving parse objects locally on iOS device

Question

What is the proper way to save parse objects locally? I placed them in an NSMutableDictionary and tried saving them with NSUserDefaults but that failed with this error, "Attempt to set a non-property-list object as an NSUserDefaults value".

I want to upload my object to Parse and save locally too. Kind of like caching it. I know that parse offers query caching but I need to cache when uploading too, not just when querying.

If it makes a difference, the items inside my pfobject are strings and piffles (images).

I would appreciate if somebody could point me in the right direction.

Nabeel Ahmed · Accepted Answer · 2014-12-11 05:36:17Z

4

parse has added this feature on 9th December for iOS http://blog.parse.com/2014/12/09/parse-local-datastore-for-ios/

answered Dec 11, 2014 at 5:36

Nabeel Ahmed

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2 Comments

Bista Over a year ago

One question, can we use parse to store data ONLY locally?

Nabeel Ahmed Over a year ago

I guess yes but I am not aware how! Moreover parse is now open source we can do anything with it

Nikolay Mamaev · Accepted Answer · 2014-06-22 03:03:33Z

2

Only property lists can be saved into NSUserDefaults. Property list types are following: NSArray, NSDictionary, NSString, NSData, NSDate, NSNumber (see property lists description).

If some class conforms to the NSCoding protocol then it can be serialized into NSData and thus saved into NSUsedDefaults (see for example the Storing NSColor in User Defaults article).

But the PFObject class doesn't conform to the NSCoding protocol, so there is no way to serialize it into NSData and save to user defaults.

However, as I understood, you can create NSDictionary from PFObject; you can save NSDictionary to NSUserDefaults and later restore PFObject from the saved NSDictionary.

answered Jun 22, 2014 at 3:03

Nikolay Mamaev

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1 Comment

Bista Over a year ago

One question, can we use parse to store data ONLY locally?

Fosco · Accepted Answer · 2014-06-22 02:24:17Z

1

There's no proper way to do this right now. Local Data Store was added to Android on 4/30/2014 and will be arriving for iOS at some point soon.

You should not do this, because it could definitely break after a new SDK release, but I did find a hacky way to do this until then... https://gist.github.com/gfosco/ac6b5ebb42791ced0932

answered Jun 22, 2014 at 2:24

Fosco

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2 Comments

Bista Over a year ago

One question, can we use parse to store data ONLY locally?

Fosco Over a year ago

You can... That was one of the things I thought was very cool, using LDS to make offline-only apps easier.

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