AFMotion

AFMotion is a thin RubyMotion wrapper for AFNetworking, the absolute best networking library on iOS.

Usage

AFMotion can be used with standalone URL requests:

AFMotion::HTTP.get("http://google.com") do |result|
  p result.body
end

AFMotion::JSON.get("http://jsonip.com") do |result|
  p result.object["ip"]
end

Web Services

@client = AFMotion::... # create your client

@client.get("stream/0/posts/stream/global") do |result|
  if result.success?
    p (result.operation || result.task) # depending on your client
  elsif result.failure?
    p result.error.localizedDescription
  end
end

You can either use AFMotion::Client or AFMotion::SessionClient to group similar requests. They have identical APIs, except for their creation and that their request result objects contain either result.operation (for ::Client) or result.task (for ::SessionClient).

AFMotion::Client

If you're interacting with a web service, you can use AFHTTPRequestOperationManager with this nice wrapper:

# DSL Mapping to properties of AFHTTPRequestOperationManager

@client = AFMotion::Client.build("https://alpha-api.app.net/") do
  header "Accept", "application/json"

  response_serializer :json
end

AFMotion::SessionClient

If you're using iOS7, you can use AFHTTPSessionManager:

# DSL Mapping to properties of AFHTTPSessionManager

@client = AFMotion::SessionClient.build("https://alpha-api.app.net/") do
  session_configuration :default

  header "Accept", "application/json"

  response_serializer :json
end

Images

Loading images from the internet is pretty common. AFNetworking's existing methods aren't bad at all, but just incase you want extra Ruby:

  image_view = UIImageView.alloc.initWithFrame CGRectMake(0, 0, 100, 100)
  image_view.url = "http://i.imgur.com/r4uwx.jpg"

  # or

  placeholder = UIImage.imageNamed "placeholder-avatar"
  image_view.url = {url: "http://i.imgur.com/r4uwx.jpg", placeholder: placeholder}

You can also request arbitrary images:

  AFMotion::Image.get("https://www.google.com/images/srpr/logo3w.png") do |result|
    image_view = UIImageView.alloc.initWithImage(result.object)
  end

Install

gem install afmotion
require 'afmotion' or add to your Gemfile

Overview

Results

Each AFMotion wrapper callback yields an AFMotion::HTTPResult object. This object has properties like so:

AFMotion::some_function do |result|
  # result.operation is the AFURLConnectionOperation instance
  p result.operation.inspect

  if result.success?
    # result.object depends on the type of operation.
    # For JSON and PLIST, this is usually a Hash.
    # For XML, this is an NSXMLParser
    # For HTTP, this is an NSURLResponse
    # For Image, this is a UIImage
    p result.object

  elsif result.failure?
    # result.error is an NSError
    p result.error.localizedDescription
  end
end

One-off Requests

There are wrappers which automatically run a URL request for a given URL and HTTP method, of the form:

AFMotion::[Operation Type].[HTTP method](url, [Parameters = {}]) do |result|
  ...
end

Example:

AFMotion::HTTP.get("http://google.com", q: "rubymotion") do |result|
  # sends request to http://google.com?q=rubymotion
end

AFMotion::HTTP.get/post/put/patch/delete(url)...
AFMotion::JSON.get/post/put/patch/delete(url)...
AFMotion::XML.get/post/put/patch/delete(url)...
AFMotion::PLIST.get/post/put/patch/delete(url)...
AFMotion::Image.get/post/put/patch/delete(url)...

HTTP Client

If you're constantly accesing a web service, it's a good idea to use an AFHTTPRequestOperationManager. Things lets you add a common base URL and request headers to all the requests issued through it, like so:

client = AFMotion::Client.build("https://alpha-api.app.net/") do
  header "Accept", "application/json"

  response_serializer :json
end

client.get("stream/0/posts/stream/global") do |result|
  # result.operation exists
  ...
end

If you're using iOS7, you can use AFHTTPSessionManager:

# DSL Mapping to properties of AFHTTPSessionManager

client = AFMotion::SessionClient.build("https://alpha-api.app.net/") do
  session_configuration :default

  header "Accept", "application/json"

  response_serializer :json
end

client.get("stream/0/posts/stream/global") do |result|
  # result.task exists
  ...
end

If you're constantly used one web service, you can use the AFMotion::Client.shared variable have a common reference. It can be set like a normal variable or created with AFMotion::Client.build_shared.

AFHTTPRequestOperationManager & AFHTTPSessionManager support methods of the form Client#get/post/put/patch/delete(url, request_parameters). The request_parameters is a hash containing your parameters to attach as the request body or URL parameters, depending on request type. For example:

client.get("users", id: 1) do |result|
  ...
end

client.post("users", name: "@clayallsopp", library: "AFMotion") do |result|
  ...
end

Multipart Requests

AFHTTPRequestOperationManager & AFHTTPSessionManager support multipart form requests (i.e. for image uploading) - simply use multipart_post and it'll convert your parameters into properly encoded multipart data. For all other types of request data, use the form_data object passed to your callback:

# an instance of UIImage
image = my_function.get_image
data = UIImagePNGRepresentation(image)

client.multipart_post("avatars") do |result, form_data|
  if form_data
    # Called before request runs
    # see: https://github.com/AFNetworking/AFNetworking/wiki/AFNetworking-FAQ
    form_data.appendPartWithFileData(data, name: "avatar", fileName:"avatar.png", mimeType: "image/png")
  elsif result.success?
    ...
  else
    ...
  end
end

This is an instance of AFMultipartFormData.

If you want to track upload progress, you can add a third callback argument which returns the upload percentage between 0.0 and 1.0:

client.multipart_post("avatars") do |result, form_data, progress|
  if form_data
    # Called before request runs
    # see: https://github.com/AFNetworking/AFNetworking/wiki/AFNetworking-FAQ
    form_data.appendPartWithFileData(data, name: "avatar", fileName:"avatar.png", mimeType: "image/png")
  elsif progress
    # 0.0 < progress < 1.0
    my_widget.update_progress(progress)
  else
  ...
end

Headers

You can set default HTTP headers using client.headers, which is sort of like a Hash:

client.headers["Accept"]
#=> "application/json"

client.headers["Accept"] = "something_else"
#=> "application/something_else"

client.headers.delete "Accept"
#=> "application/something_else"

Client Building DSL

The AFMotion::Client & AFMotion::SessionClient DSLs allows the following properties:

header(header, value)
authorization(username: ___, password: ____) for HTTP Basic auth, or authorization(token: ____) for Token based auth.
request_serializer(serializer). Allows you to set an AFURLRequestSerialization for all your client's requests, which determines how data is encoded on the way to the server. So if your API is always going to be JSON, you should set operation(:json). Accepts :json and :plist, or any instance of AFURLRequestSerialization.
response_serializer(serializer). Allows you to set an AFURLResponseSerialization, which determines how data is decoded once the server respnds. Accepts :json, :xml, :plist, :image, :http, or any instance of AFURLResponseSerialization.

For AFMotion::SessionClient only:

session_configuration(session_configuration, identifier = nil). Allows you to set the NSURLSessionConfiguration. Accepts :default, :ephemeral, :background (with the identifier as a String), or an instance of NSURLSessionConfiguration.

chrisradford/afmotion