How to use Magical Record in Swift

Posted by On 2月 19, 2015 0 Comment

Magical Record(Objective-C)

Magical Record is Ruby like operation library of CoreData.
It is so useful, but it’s Objective-C.
To use it from Swift, we need more steps

Steps

Bridge Header

Make new BridgeHeader to call Objective-C from Swift.
Create header named YourApplication-Bridging-Header.h
YourApplication is your application name

#ifndef YourApplication_YourApplication_Bridging_Header_h
#define YourApplication_YourApplication_Bridging_Header_h

#define MR_SHORTHAND
#import "CoreData+MagicalRecord.h"
#endif

Add “CoreData+MagicalRecord.h”
And set this header as bridge header in Swift Compiler setting(Build Settings)
You can find Objective-C Bridging Header using search(search by objective-c bri).
bridge header

Model

Model file is same as general Objective-C data file(xcdatamodeld.
Let’s make NSManageObject by XCode.
This is an example data structure

Flashcardpack
uuid String
name String

This is code

@objc(Flashcardpack)  // Important!
class Flashcardpack: NSManagedObject {

    @NSManaged var uuid: String
    @NSManaged var name: String

    class func create(uuid: NSString, name: NSString) {
        var res = Flashcardpack.MR_createEntity() as Flashcardpack
        
        res.uuid = uuid
        res.name = name
        // Save
        NSManagedObjectContext.MR_defaultContext().MR_saveToPersistentStoreAndWait()
        return res;
    }
}

Very simple, isn’t it? The key is to add @objc() …

Ref

present

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