Interactive App Building

Question 1

Which of the following segues adds a new view to the navigation stack? Present Modally, Present as popover, Show

Answer 1

Show

Question 2

TF: When we want to show a view, we add the view to the navigation stack

Answer 2

False

Question 3

Why do we use a navigation stack rather than a modal view for our information flow?

Answer 3

A modal view is used to display temporary information
A modal view is used to draw the users attention and prevents them from taking any action unless the modal is dismissed.
A navigation stack is used to display hierarchical or organized data like our story.

Question 4

How does a navigation controller object manage the currently displayed screens?

Answer 4

Using the navigation stack, which is represented by an array of view controllers

Question 5

TF: You cannot interact with the navigation bar. It is entirely managed by the system.

Answer 5

False

Question 6

TF: When we want to show a view, we add the view to the navigation stack?

Answer 6

False

Question 7

TF: A tuple in swift is also known as an anonymous struct.

Answer 7

True

Question 8

What’s the difference if we add an image like this -> UIImage(named: “Home”) as opposed to the pic with the name( can’t put it in here but the image comes up in xcode)?

Answer 8

if we return the image like this -> UIImage(named: “Home”) -> This an optional and must be force unwrapped.

Question 9

If you have 2 functions with the same name, but different parameters for the function, what is this called?

Answer 9

Method overloading

Question 10

Under the hood in Swift a tuple is just:

Answer 10

Struct without a name

Question 11

An optional is a(n) ________ under the hood with a ______ and _________ case

Answer 11

Enum
Some
None

Question 12

What is a selector?

Answer 12

A name used to select a method to execute for an object

Question 13

Why do we set a view’s translatesAutoresizingMaskIntoConstraints property to false?

Answer 13

The system adds its own constraints to views which might conflict with ours

Question 14

TF: We can only apply styles to the entire attributed string. It is not possible to style a particular section of a string.

Answer 14

False

Question 15

Before we can add constraints to any views we create, which of the following tasks is required:

Answer 15

Adding the created view as a subview of the main view.

Question 16

How do we modify the appearance of an attributed string?

Answer 16

Using a dictionary of attributes that we associate with the string

Question 17

Why can we access self inside our closure when we mark the property as lazily loaded?

Answer 17

Lazy loaded properties are created after object initialization meaning self is available to access.

Question 18

TF: var someProperty = 1 is the same as var someProperty = { return 1 }()

Answer 18

True

Question 19

TF: Refactoring is the process of changing the structure of our code and changing functionality

Answer 19

False

Question 20

Why do we use a delegate pattern to be notified of the text field’s events?

Answer 20

Because at most only a single object needs to know about the event

Question 21

How do we send additional information along with a notification?

Answer 21

Using the userInfo dictionary property

Question 22

TF: By default every app has its own notification center that manages notifications and observers

Answer 22

True

Question 23

Which of the following communication methods allows for a loosely coupled, one-to-many pattern? Calling a method on an object, Notifications, Target-Action, Delegates

Answer 23

Notifications

Question 24

TF: Passing the memory address of a file rather than a value allows us to work on large files without affecting memory usage

Answer 24

True

Question 25

How is an inout parameter different from a regular parameter?

Answer 25

Inout passes by reference while a regular parameter passes by value

Question 26

If I wanted to create a type called Degree that was represented as a Double, how would I do that?

Answer 26

typealias Degree = Double