RedPotion uses the following for networking:

• AFNetworking pod
• AFMotion gem
• SDWebImage

---

Remote images

You can set remote_image to a URL string or an instance of NSURL and it will automatically fetch the image and set the image (with caching) using the power of SDWebImage.

You should always use remote_image for any image you download, it will cache it to memory and out to disk when it's appropriate. It does it async and is performant, even for a large table of images.

class MyStylesheet < ApplicationStylesheet
  def my_ui_image_view(st)
    # placeholder_image= is just an alias to image=
    # Set the placeholder image you want from your resources directory
    st.placeholder_image = image.resource("my_placeholder")
    # Set the remote URL. It will be applied to the UIImageView
    # when downloaded or retrieved from the local cache.
    st.remote_image = "http://www.rubymotion.com/img/rubymotion-logo.png"
    # or st.remote_image = NSURL.urlWithString(...)
  end
end

To assign a remote image to a UIImageView:

your_ui_image_view.remote_image = "http://bit.ly/18iMhwc"

---

Get HTML or JSON directly

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

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

---

Setup a session client to reuse (best practice)

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

  header "Accept", "application/json"

  response_serializer :json
end

Then use it:

@client.get("stream/0/posts/stream/global") do |result|
  # result.operation is the AFURLConnectionOperation instance
  mp result.operation.inspect
  mp result.status_code

  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
    mp result.error.localizedDescription
  end
end

The client 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

The session supports 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 session client 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 and must be called before calling header or authorization or else the headers will not be applied.
• 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.
• 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.

You can also configure your client by passing it as a block argument:

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

  client.header "Accept", @custom_header
end

See all of AFMotion's docs here.