Re: Mapkit annotation arrays and writing to a file
Re: Mapkit annotation arrays and writing to a file
- Subject: Re: Mapkit annotation arrays and writing to a file
- From: Jens Alfke <email@hidden>
- Date: Tue, 08 May 2012 14:27:01 -0700
On May 8, 2012, at 2:08 PM, Alex Zavatone wrote:
> I've noticed problems before with structs and NSJSONSerializaion.
> I was trying to write out a dictionary (or array) of the contents of mapView.annotations, yet writeDictToFile fails, while it writes a simple dict just fine.
> Is there a problem with the structs within the annotations, namely, the CLLocationCoordinate2D struct for each annotation, that prevents this from being able to be written out to a dictionary or array?
I don’t know what you mean by ‘struct’ here — C structs aren’t Objective-C objects, so they can’t appear in a Cocoa collection.
I do know that NSJSONSerialization only supports data types defined in JSON, i.e. NSDictionary, NSArray, NSString, NSNumber, NSNull. If your object tree has instances of any other classes in it, the encoder will throw an exception.
—Jens
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