Telerik Software Academy Mobile apps for iPhone & iPad

 iOS app architecture  ViewControllers  Views  Linking Views to ViewControllers  Adding and Using Controls

Templates and Stuff

 iOS apps are build from two components:  Views – represent the UI  ViewControllers – the programming logic  Views are linked to ViewControllers  ViewControllers are regular classes  They can fetch data from the views  They can send data to the views  They can change the views programatically

Views and Controls

 Views are represented by a XIB (NIB) files  They hold the UI components  Can contain UI logic  Is built from controls  When creating an iOS app, a initial view is created  Depending on the project type it can be empty or with a scaffold application

 To add controls to a View:  Open a storyboard file (Main.storyboard)  Show the Utilities  Drag a control from the toolbox into the view

Live Demo

UIViewController and UITableViewController

 ViewControllers are the code-behind of a View  They are linked to a View  Can react to events from a View (button click, text change, etc…)  Can send data to a View  Change the content of a text field, take the selected date from a DatePicker, etc…  Can change a View  Create animations or replace views

 There are many types of ViewControllers  UIViewCotroller, UITableViewController, UISplitViewController, etc..  UIViewController and UITableViewController are used the most  UIViewController is a generic ViewController  Nothing special about it  UiTableViewController is used for a table view  Used to list data

 To create a UIViewController:  Create a regular class and inherit UIViewController  Select a view from a storyboard  In the Utilities  Show Identity Inspector  Type the name of your UIViewController into the class text field  Done, can link controls

Live Demo

 UITableViewController is done pretty much the same as UIViewController  Inherit UITableViewController, instead of UIViewController  UITableViewController needs a little setup  Create a Table View to the storyboard  Add a table view cell to the table view  Give it an identifier  Write two methods in your TableViewController -tableView:cellForRowAtIndexPath-tableView:numberOfRowsInSection

Live Demo

 To link (use) controls in the ViewController, IBOutlets must be created  Go to the Storyboard  CTRL + click on the control  Select "New Referencing Outlet" and drag it to the ViewController  A property is created so the control can be used in the ViewController

Live Demo

 With a IBOutlet, a control can be used in the ViewController  Yet actions are hard to be handled  We can link an event from a control from the View to a method in the ViewController  CTRL + click on the control  Select a event (i.e. "Touch up inside") and drag it to the linked ViewController

Live Demo

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 Create a UITableViewController that holds a list of generated and encoded passwords  Each password has an account name and encryption code  Once you type the code, the encrypted password is decrypted  Implement a UIViewController for adding a password, encryption code and an option to create a random password