iOS Development with Swift - Udacity Review

Udacity is not only a great place to learn, but a community full of experts, enthusiast and pioneers in what educations should be like. I took my first course way back in 2012. I was not only really motivated  to learn  and follow the course, but also amazed of how with IT you have the power to make the world a better place.

This short post is quick review and summary of what I learn so far in the latest course I am taking at Udacity.

 Intro to iOS App Development with Swift

Basics about the iOS official IDE: Xcode:

• IDE structure
• Adding resources to the project (images and media files)
• Using the StoryBoard

Basic concepts behind the MVC design patter, creating and iOS App using the Swift programing language in Xcode:

• ViewControllers: Inherit from UIViewController class
• Each View that contains UI Objects (Buttons, Labels, Eg) should have its own ViewController
• NavigationController: Allows you to create the navigation between views
• UIObjects can be bind to the controllers in two different ways:
• Outlet: Creates a reference or pointer to the UI object in order to use it inside the controller
• Action: Creates a method that allows you to react to a UI event

Two powerful frameworks that you can use to create iOS Apps:

• UIKit: Provides the elements that allows you to create the user interface (UI)
• AVFoundation: basic services for working with time-based audiovisual media

Creating the UI of an App:

• Using the story board you can easily create the UI of an application with drag on drop. 
• You can add a UI object by dragging it from Utilities panel and placing inside the View in the story board.
• In order to place the UI elements dynamically you must used constraints. 
• To add a constraint hold the ctrl key over the UI element and drag it to the side.  (Eg: center horizontally)
• You can bind UI objects to the ViewController by holding the ctrl key and dragging the mouse pointer from the UI Object to the ViewController class