iOS 字符串转json 字符串转数组

//字符串转数组
- (id)toArrayOrNSDictionary:(NSString *)jsonData{
    if (jsonData != nil) {
        NSData* data = [jsonData dataUsingEncoding:NSUTF8StringEncoding];
        id jsonObject = [NSJSONSerializationJSONObjectWithData:data options:NSJSONReadingAllowFragmentserror:nil];
        if (jsonObject != nil){
            return jsonObject;
        }else{
            // 解析错误
            return nil;
        }
    }
    return nil;
}

//字符串转json
- (NSString *)toJSONData:(id)theData{
    NSString * jsonString = @"";
    if (theData != nil) {
        NSData *jsonData = [NSJSONSerializationdataWithJSONObject:theData options:NSJSONWritingPrettyPrintederror:nil];
        if ([jsonData length] != 0){
            jsonString = [[NSStringalloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
        }
    }
    return jsonString;
}