[ObjC] Generated code is not actual with JSONModel library

[RomanTruba]

Description

Generated objective-c code uses old JSONModel library method for init, which is deprecated.

SwaggerClient/Model/SWGSearchModel.m:20:33: 'initWithDictionary:' is deprecated: use initWithModelToJSONDictionary:

Swagger-codegen version

2.2.1

Swagger declaration file content or url

swagger: '2.0'

info:
  version: "1"
  title: "Hello warning"

basePath : "/api/v1"
produces:
  - application/json
schemes:
  - https
        
paths:
  /categories:
    get:
      description: get categories
      responses:
        200:
          description: Successful response
          schema:
            type: array
            items:
              $ref: '#/definitions/UserSkill'
           
definitions:
  Category:
    description: Some category for user
    type: object
    properties:
      id:
        type: integer
        format: int64
      alias:
        type: string
      localized_name:
        type: string
  UserSkill:
    description: User skill description based on category
    allOf:
      - $ref: '#/definitions/Category'
      - properties: 
          year_started:
            description: Year since user has that skill
            type: integer

Command line used for generation

swagger-codegen generate -i ./swagger.yaml -l objc -o ./SwaggerClient

Steps to reproduce

1. Generate code
2. Create a test project, create Podfile with contents:

use_frameworks!
platform :ios, '9.0'

target 'TestSwagger' do
    pod 'SwaggerClient', :path => './SwaggerClient'
end

3. Run pod install
4. Build project

Suggest a Fix

Use a suggested method initWithModelToJSONDictionary

[wing328]

@Dreddik thanks for reporting. May I know if you've time to contribute a fix? A good starting point is https://github.com/swagger-api/swagger-codegen/blob/master/modules/swagger-codegen/src/main/resources/objc/model-body.mustache

cc @mateuszmackowiak

[wing328]

@Dreddik PR merged. Thanks for the contribution.