NSDictionary+DictionaryWithData.

#import <Foundation/Foundation.h>

@interface NSDictionary (DictionaryWithData)
+ (id)dictionaryWithData:(NSData *)data;
- (id)initWithData:(NSData *)data;
@end

#import "NSDictionary+DictionaryWithData.h"



@implementation NSDictionary (DictionaryWithData)
+(NSPropertyListMutabilityOptions) mutabilityOption {
    return NSPropertyListImmutable;
}

+ (id)dictionaryWithData:(NSData *)data
{
    static BOOL methodChecked = NO;
    static BOOL use_propertyListWithData = NO;
    if (!methodChecked) {
        SEL sel = @selector(propertyListWithData:options:format:error:);
        use_propertyListWithData = [[NSPropertyListSerialization class]
                                    respondsToSelector:sel];
        methodChecked = YES;
    }

    id result;

    if (use_propertyListWithData) {

         result =  [NSPropertyListSerialization propertyListWithData:data
                                                         options:[self mutabilityOption]
                                                          format:nil
                                                           error:nil];

    } else {

         result =  [NSPropertyListSerialization propertyListFromData:data
                                                mutabilityOption:[self mutabilityOption]
                                                          format:NULL
                                                errorDescription:nil];
    }

    return  [result isKindOfClass:[NSDictionary class]] ? result : nil;
}

- (id)initWithData:(NSData *)data
{
    id result = [[self class] dictionaryWithData:data];
    self = result ? [self initWithDictionary:result ] : nil;
    return  self;
}
@end

@implementation NSMutableDictionary (DictionaryWithData)
+(NSPropertyListMutabilityOptions) mutabilityOption {
    return NSPropertyListMutableContainersAndLeaves;
}
@end