CSC 581: Mobile App Development
Spring 2018

Midterm Review

Thu, Mar 2
  • The test will include extra points (Mistakes Happen!), e.g., 103 or 104 points, but graded on a scale of 100.

Types of questions
  • factual knowledge: TRUE/FALSE, multiple choice
  • conceptual understanding: short answer, discussion
  • synthesis and application: explain/trace/modify code or app behavior
Study advice
  • review online lecture notes
  • review the explanations & exercises from the book
  • look over lab exercises, homework assignments
  • reference other sources for examples, different perspectives
Course material Mobile landscape mobile vs. desktop applications native vs. bybrid development iOS vs. Android market share, ease of development, profits vs. volume iOS platform iOS history iOS architecture Cocoa Touch, media layer, core services, core OS mobile design guidelines iOS design themes: clarity, deference, depth iOS design principles aesthetic integrity, direct manipulation, metaphors, consistency, feedback, user control general tips minimize cognitive load, optimize user flow, cut out the clutter, make navigation self-evident, design for interruption, focus on first-time experiece, avoid annoying notifications Swift programming language released in 2014 (replacing Objective-C) variables let vs. var scope - can have variable shadowing (override variable in new scope) data types (Int, Double, Boolean, Character, String, ...) fully type safe, type inferencing expressions and operations +, -, *, /, %, +=, -=, *=, /=, %= (no ++ or --) ==, !=, <, <=, >, >= cannot have mixed types in an expression Strings + operator, multiline strings using """, string comparison (==, >, ...) fields: count methods: lowercased, uppercased, contains, hasPrefix, hasSuffix control statements if, if-else, while, for, guard specify ranges using ... or ..< functions internal vs. external names for parameters, default parameters defining types struct: generally used for data structures can define fields private, but not common can define methods, but usually only limited functionality can define Init, but usually initialize fields directly does not support inheritance implemented as value type - makes copy when assigned/passed class: generally used for full-blown objects provide data hidig with private fields provide functionality with public methods provide Init to initialize fields supports inheritance must specify which methods override parent, use super. to call methods in parent class implemented as reference type - assigns/passes reference to object enumerations collections Array e.g., var names = ["Chris", "Pat"] access via [], e.g., names[0] fields: count methods: append, +=, remove, insert Dictionaries (maps) e.g., var ages = ["Chris": 20, "Pat": 21] access via []: names["Chris"] fields: count, keys note: collections are structs, so value types optionals used when value may or may not be present unwrap using !, or if-let optional type can be declared: String?, Int?, ... Xcode & iOS UIkit Xcode IDE playgrounds vs. projects IDE areas: editor, toolbar, navigator, debug, utility utility area includes Object Library & Attribute Editor Interface Builder is integrated into the editor area UIKit code framework for building iOS apps UIView is the foundational class for displaying things subclasses: UILabel, UIImageView, UITextView, UIScrollView UITableView, UIToolbar, UINavigationBar, UITabBar UIControl defines control elements subclasses: UIButton, UISegmentedControl, UITextField, UISlider, UISwitch, UIDatePicker Single View App template ViewController.swift: controls the behavior of the app Main.storyboard: defines the UI for the app Common tasks add a UI element: drag from object library onto storyboard create an action: control-drag from UI element to ViewController adds a method associated with the specified action create an outlet: control-drag from UI element to ViewController adds a fields associated with that UI element app layout: center elements using Add New Alignmewnt Constraints fix size and position relatively using Add New Constraints group elements horzontally or vertically using stack views segues: each screen in an app has its own ViewController transition from one view to another by connecting the controllers can select the presentation method can add navigation controllers to control destination