iOS 中 coredata 的使用步骤

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.h文件

//
// numbertransformable.h
// 01-NSURLConnection01-GET请求
//
// Created by quanchaochao on 15/12/29.
// Copyright © 2015年 heima. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface numbertransformable : NSValueTransformer

@end

.m文件

//
// numbertransformable.m
// 01-NSURLConnection01-GET请求
//
// Created by quanchaochao on 15/12/29.
// Copyright © 2015年 heima. All rights reserved.
//

#import "numbertransformable.h"

@implementation numbertransformable
+ (BOOL)allowsReverseTransformation
{
    return YES;
}
+ (Class)transformedValueClass
{
    return [NSData class];
}
- (id)transformedValue:(id)value
{
    NSArray *arry = (NSArray *)value;
    NSData *data = [NSKeyedArchiver archivedDataWithRootObject:arry];
    return data;
}
- (id)reverseTransformedValue:(id)value
{
    NSData *data = (NSData *)value;
    NSArray *arry = [NSKeyedUnarchiver unarchiveObjectWithData:data];
    return arry;
}
@end

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