Inspired by RestKit. A very simple objective-c framework that maps a JSON response from NSDictionary or NSArray to NSObject subclasses for iOS.

Install

Original method

Copy all files in JTObjectMapping/ into your project.

Usage

Suppose this is a JSON User object response represented in NSDictionary after parsing

{
    "create_date" = "1970-01-01T00:00:00+0000";
    "p_age" = 30;
    "p_childs" =     (
        Mary,
        James
    );
    "p_name" = Bob;
    "p_title" = Manager;
    "social_networks" = {
        "twitter" = "@mystcolor";
        "facebook" = "yourFacebookID";
    }
}

Get ready with your JSON use [NSObject objectFromJSONObject:json mapping:mapping] to convert.

...
NSDictionary *json = <Parsed JSON response from above>;

//
// Use +[NSObject objectFromJSONObject:mapping:] to convert 
// the NSDictionary into your JTUserTest object
//
JTUserTest *user = [JTUserTest objectFromJSONObject:json mapping:mapping];
...

Define necessary mappings, from a dictionary key to a property keyPath.

// Define the mapping of a nested custom object - JTSocialNetworkTest
NSDictionary *socialNetworkMapping = [NSDictionary dictionaryWithObjectsAndKeys:
                                           @"twitterID", @"twitter",
                                           @"facebookID", @"facebook",
                                       nil];

NSDictionary *mapping = [NSDictionary dictionaryWithObjectsAndKeys:
                @"name", @"p_name",
                @"title", @"p_title",
                @"age", @"p_age",
                @"childs", @"p_childs",                    
                [NSDate mappingWithKey:@"createDate"
                      dateFormatString:@"yyyy-MM-dd'T'HH:mm:ssZ"], @"create_date",
                [JTSocialNetworkTest mappingWithKey:@"socialNetwork"
                                            mapping:socialNetworkMapping], @"social_networks",
                nil];

Of course you need to define your own User object with corresponding @synthesize properties, and thats all for what you need.

// JTSocialNetworkTest.h

@interface JTSocialNetworkTest
@property (nonatomic, copy) NSString *twitter;
@property (nonatomic, copy) NSString *facebook;
@end

// JTSocialNetworkTest.m
@implementation
@end

// JTUserTest.h

@interface JTUserTest : NSObject

@property (nonatomic, copy) NSString *name;
@property (nonatomic, copy) NSString *title;
@property (nonatomic, copy) NSNumber *age;
@property (nonatomic, strong) NSDate *createDate;
@property (nonatomic, strong) NSArray *childs;
@property (nonatomic, strong) JTSocialNetworkTest *socialNetwork;

@end

// JTUserTest.m
#import "JTUserTest.h"

@implementation JTUserTest
@end

For more detailed usage, see JTObjectMappingTests.m, will be adding more detailed description soon.

Update Logs

v1.1.2

• Added auto mapping from underscores to CamelCases (e.g. full_name -> fullName)

v1.1.1

• Added URL support, thanks to @TheSantaClaus and adding the test cases nicely.

v1.1

• Refactored JTObjectMapping. Now extending custom mappings are much more cleaner.
• Proper keyPath support.

v1.0.7

• Added JTSetMapping and JTDateEpochMappings, thanks to @zcharter for making this happen!

v1.0.6

• Added experimental keypath support. use #define JTOBJECTMAPPING_DISABLE_KEYPATH_SUPPORT = 1 to disable it.

v1.0.5

• Fixed nested array causing crash

v1.0.4

• Added auto NSDictionary value to NSObject property mapping with the same key defined
  
• Fixed false possible JSON response in NSArray use case

v1.0.3

• Add raw array JSON response support

v1.0.2

• Added NSArray support

v1.0.1

• Added NSDate support for mappings