Dependency Management

Cocoapods and the most common used library in Swift

Objective

• We are going to re-create our Weather application using the most popular library that is widely used by iOS developer.

• We will see the difference in term of performance between the app created during Mini Project and app created during Library.

Cocoapods

• Cocoapods is iOS Dependency Management tool.

• Dependency Management tools help to manage your library , you don’t need to worry about the dependency and versioning.

• Example of dependency management tool in other language: Composer and Gradle.

Installing Cocoapods

• Update Ruby (Ruby is pre-installed for MAC 10.7 and above) : sudo gem update --system

• Download CocoaPods using gem: sudo gem install cocoapods

• Install Cocoapods: pod setup

$ mkdir -p $HOME/Software/ruby $ export GEM_HOME=$HOME/Software/ruby $ gem install cocoapods [...] 1 gem installed $ export PATH=$PATH:$HOME/Software/ruby/bin $ pod --version

Latest installation code in El Capitan

Install Library using Pod

• Go to the path of our Project from terminal • Create our Podfile using this command:

-pod init

• Open Podfile with Xcode using following command: • open -a Xcode Podfile

• Add the library needed between ‘do’ and ‘end’ • Go to your project directory and download

the library : pod install

Library repository• We navigate to cocoapods.org or cocoacontrols.com to get the Library that can be

integrated into our app.

• We are going to add the following Library into the

• Alamofire

• SwiftyJson

• Kingfisher

• SCLAlertView

• Once the app is installed we are going to work with the workspace of the project.

Alamofire• Alamofire is the most popular networking library for

Networking using Swift (AFNetworking for Objective C)

• AFNetworking is built on top of Foundation URL loading system.

• Refer to documentation for more info.

AFNetworking Sample Code

Alamofire.request(.GET, "https://httpbin.org/get", parameters: ["foo": "bar"]) .responseJSON { response in print(response.request) // original URL request print(response.response) // URL response print(response.data) // server data print(response.result) // result of response serialization

if let JSON = response.result.value { print("JSON: \(JSON)") } }

Alamofire.request(.POST, "https://httpbin.org/get", parameters: ["foo": "bar"]) .responseJSON { response in print(response.request) // original URL request print(response.response) // URL response print(response.data) // server data print(response.result) // result of response serialization

if let JSON = response.result.value { print("JSON: \(JSON)") } }

AFNetworking POST request

AFNetworking GET request

SwiftyJSON• SwiftyJSON is one of the most helpful library to

facilitate the parsing of JSON.

• Due to Swift safe-type and optional binding principal, we need to verify the type and nullity when retrieving the JSON.

• SwiftyJSON will help us reduce the complexity of doing all that.

Example

if let topApps = parsedObject as? NSDictionary { if let feed = topApps["feed"] as? NSDictionary { if let apps = feed["entry"] as? NSArray { if let firstApp = apps[0] as? NSDictionary { if let imname = firstApp["im:name"] as? NSDictionary { if let appName = imname["label"] as? NSString { //3 println("Optional Binding: \(appName)") } } } } }

if let appName = json["feed"]["entry"][0]["im:name"]["label"].string { println("SwiftyJSON: \(appName)") }

This code in Swift:

Can be simplified to this:

MBProgressHUD• MBProgressHUD is an iOS

library that displays a translucent HUD with an indicator.

• We use it to inform user that a background thread is being executed.

• MBProgressHUD is code written in Objective C. Cocoapods help us to bridge the code from Objective C to Swift.

MBProgressHUD Sample Code

MBProgressHUD.showHUDAddedTo(self.view, animated: true)

MBProgressHUD.hideHUDForView(self.view, animated: true)

MBProgressHUD show a HUD.

MBProgressHUD hide a HUD.

Kingfisher• Kingfisher is a lightweight and pure Swift

implemented library for downloading and caching images from the web

• It is a UIImageView category. New method will be added to UIImageView and you can call the methods to load image from URL

import Kingfisher

imageView.kf_setImageWithURL(NSURL(string: "http://your_image_url.png")!)

SCLAlertView• SCLAlertView is one of

the library that can be found from CocoaControls.

• You can create a nicer UIAlertView for your application.SCLAlertView().showWarning("Hello Warning", subTitle: "This is a more descriptive warning text.") // Warning

SCLAlertView().showInfo("Hello Info", subTitle: "This is a more descriptive info text.") // Info