Simple Object Mapper. A category on NSObject that will construct a instance of your class and assign all values from the dictionary using KVC (make sure your property names are the same as the keys in the dictionary)

NSObject+SimpleObjectMapping

#import <objc/runtime.h>

@implementation NSObject (SimpleObjectMapping)

+ (instancetype) objectFromDictionary:(NSDictionary *)dictionary {
    
    NSObject *instance = [[self.class alloc] init];
    
    objc_property_t *properties = class_copyPropertyList(self.class, NULL);
    objc_property_t property;
    
    while ((property = *properties ++) != nil) {
        
        NSString *key = [NSString stringWithUTF8String:property_getName(property)];
        id<NSObject> value = nil;
        
        if ((value = dictionary[key])) {
            [instance setValue:value forKey:key];
        }
    }
    return instance;
}

NSObject+SimpleObjectMapping

A simple class extension to do a simple thing:

• Take a dictionary
• Assign the values from the dictionary to properties in your object via KVC
• Safe -- no SetValue:ForUndefinedKey: exception for you.

note: The keys in the dictionary must match your property names

Usage:

//...
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:options error:&error];
MyObject *obj = [MyObject objectFromDictionary:json];

Simple.