I have to store a custom class object to Coredata. The problem is my custom class contains structs,enum etc.I tried following method.
-(void)encodeWithCoder:(NSCoder *)encoder .
But am getting this error
[NSKeyedArchiver encodeValueOfObjCType:at:]: this archiver cannot encode structs'
What is the best practice to store this object to Coredata. Please help me.
You can wrap the struct in a NSData
, ie
To encode with archiver
[coder encodeObject:[NSData dataWithBytes:&my_struct length:sizeof(my_struct)]
forKey:@"my_struct"];
and to decode with archiver
NSData *data = [coder decodeObjectForKey:@"my_struct"];
[data getBytes:&my_struct length:sizeof(my_struct)];
You should have a custom implementation of the NSCoding protocol in your custom class. In your own implementations of -[initWithCoder:]
and -[encodeWithCoder:]
, you can then encode/decode the struct objects in any way you please.
On way to do this would be to call [coder encodeObject:[NSValue valueWithBytes:&yourStructVariable objCType:@encode(struct YourStructName)] forKey:@"someKey"];
in -[encodeWithCoder:]
and do the equivalent decoding in -[initWithCoder:]
.
You can then just store the class objects as transformable in Core Data.
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