问如何将JSON转换为Object

EN

- (void)requestFinished:(ASIHTTPRequest *)request {
    id<RKParser> parser = [[RKParserRegistry sharedRegistry] parserForMIMEType:[request.responseHeaders valueForKey:@"Content-Type"]]; // i'm assuming your response Content-Type is application/json
    NSError *error;
    NSDictionary *parsedData = [parser objectFromString:apiResponse error:&error];
    if (parsedData == nil) {
        NSLog(@"ERROR parsing api response with RestKit...%@", error);
        return;
    }

    [RKObjectMapping addDefaultDateFormatterForString:@"yyyy-MM-dd'T'HH:mm:ssZ" inTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]]; // This is handy in case you return dates with different formats that aren't understood by the date parser

    RKObjectMappingProvider *provider = [RKObjectMappingProvider new];

    // This is the error mapping provider that RestKit understands natively (I copied this verbatim from the RestKit internals ... so just go with it
    // This also shows how to map without blocks
    RKObjectMapping* errorMapping = [RKObjectMapping mappingForClass:[RKErrorMessage class]];
    [errorMapping mapKeyPath:@"" toAttribute:@"errorMessage"];
    [provider setMapping:errorMapping forKeyPath:@"error"];
    [provider setMapping:errorMapping forKeyPath:@"errors"];

    // This shows you how to map with blocks
    RKObjectMapping *teacherMapping = [RKObjectMapping mappingForClass:[Teacher class] block:^(RKObjectMapping *mapping) {
        [mapping mapKeyPath:@"id" toAttribute:@"objectId"];
        [mapping mapKeyPath:@"name" toAttribute:@"name"];
    }];

    [provider setMapping:teacherMapping forKeyPath:@"teacher"];

    RKObjectMapper *mapper = [RKObjectMapper mapperWithObject:parsedData mappingProvider:provider];
    Teacher *teacher = nil;
    RKObjectMappingResult *mappingResult = [mapper performMapping];
    teacher = [mappingResult asObject];

    NSLog(@"Teacher is %@ with id %lld and name %@", teacher, teacher.objectId, teacher.name);
}