Ioannis Pavlidis Dinesh Majeti Ashik Khatri Lecture 2 Ioannis Pavlidis Dinesh Majeti Ashik Khatri

Overview About XCode Demo - Building a Simple iOS App Auto Layout IBOutlet IBAction

XCode Workspace

Navigator Area

Edit Area

Utility Area

Toolbar

Demo

Auto Layout Auto Layout dynamically calculates the size and position of all the views in your view hierarchy, based on constraints placed on those views. Constraint-based approach to design allows you to build user interfaces that dynamically respond to both internal and external changes. Internal changes Dynamic type: Changes in font size. External Changes The size or shape of your superview changes: Device rotates (landscape/portrait)

IBOutlet & IBAction IBOutlets enables your code to send messages to a user interface object Example: Telling a label to display a text string or telling a button to appear or disappear IBActions enables to send a message from a User Interface control to your code. Example: When the user clicks a button control, for example, the button should send an action message telling your code to execute an appropriate action

References XCode Overview Auto Layout Creating an Outlet Connection Creating an Action Connection