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IOS SWIFT

memorize.ai (lvl 286)

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self

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iOS Dev Swift

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Date created

Mar 1, 2020

Cards (44)

Section 1

(44 cards)

self

Front

The ______ keyword refers to the specific instance of an object, and is used when calling a method, or getting or setting a property within the definition of a type.

Back

implicitly unwrapped optional

Front

is an optional that can also be used like a nonoptional value - without the need to unwrap the optional value each time it is access - because it's assumed to always have a value after that value is initially set. Your app will crash if you attempt to access an implicitly unwrapped optional that's currently nil.

Back

anyObject

Front

can represent any class within swift, but not a structure.

Back

any

Front

as the name implies, can represent an instance of any type: string, double, function, or whatever.

Back

stack view

Front

Use a ______ to set up elements in the user interface in a column from top to bottom or in a row from left to right.

Back

as!

Front

is a forced form of a type cast operator. This version will force the downcast to the specified type.

Back

index path

Front

represents that path to a specific node in a tree of nested array collections. An index path is commonly used with table views to identify the section and row of a cell

Back

Type Properties

Front

are properties that belong to the type itself and is accessed using the type's name.

Back

force-unwrap operator

Front

Use the ___________ after an optional value to access its underlying value. Force-unwrapping an optional value will result in a crash if the value is nil.

Back

type methods

Front

are methods that belong to the type itself and is accessed using the type's name.

Back

optional

Front

is a value that contains either an underlying value or nil

Back

type casting

Front

is a way to check the type of an object, or to treat that object as a different superclass or subclass from somewhere else in its own class hierarchy

Back

instance property

Front

_____ are properties that belong to an instance of a particular type

Back

equatable

Front

allows you to define how instances of the same type are equal to each other.

Back

property observer

Front

_________ are attached to a property to respond to changes in property's value and is called every time a property's value is set.

Back

optional binding

Front

is the process of attempting to assign an optional value to a constant in a conditional statement to see if the optional contains an underlying value.

Back

type inspection

Front

is used to determine, or check, the specific type of data.

Back

optional chaining

Front

allows you to work with nested optionals that are conditionally unwrapped. If any value along the way is nil, the action will fail.

Back

composition

Front

is an object oriented programming concept that utilises the use of protocols to achieve a similar polymorphic-behavior that is otherwise difficult to achieve using inheritance.

Back

dequeuing

Front

Table views use a special caching system that, whenever possible, reuse cells that have already been displayed. The process of choosing and preparing the cell for reuse is called _______.

Back

delegation

Front

is a design pattern, or common practice, that enables a class or structure to hand off, or delegate, some of its responsibilities to an instance of another type.

Back

table view cell

Front

refers to objects that draw visible rows, and the table view cell caches those objects as long as the rows are visible.

Back

auto layout

Front

is a feature in XCode's Interface Builder that allows you to build adaptive interfaces so your user interface elements maintain the same relative positions, no matter the screen's size or orientation.

Back

Initializer

Front

A _______ sets up an instance so it's ready to be used. After you declare a name for a constant or variable, you initialize the constant or variable by assigning its first value.

Back

customStringconvertible

Front

allows you to control how your custom objects are printed to the console.

Back

Constraint

Front

is a rule in Auto Layout that defines how views should be laid out or sized.

Back

instance method

Front

An _________ is a function declared inside a type — such as a struct, a class, or an enum — whose behavior depends on the current state of an individual entity.

Back

optional value

Front

can have optional properties (like a box within a box), referred to as nested optionals

Back

base class

Front

is at the root of its class hierarchy, and therefore doesn't have a superclass.

Back

property

Front

A ________ is a piece of data held by a structure, class, or enumeration.

Back

Computer Property

Front

Swift has a feature called ______ that allows a property to perform logic that returns a calculated value.

Back

as?

Front

is a conditional cast operator that attempts to downcast the value to a more specific type and store it in a new constant or variable

Back

superclass

Front

is a parent of another class (which is known as its subclass).

Back

class

Front

A _____ defines properties to store values, defines methods to provide functionality, and defines initializers to setup their initial state.

Back

inheritance

Front

is when a class is a subclass of another class and gets all of its behavior (methods, properties, and other characteristics).

Back

failable initializer

Front

refers to an initializer that may fail and will return nil as a result.

Back

subclass

Front

is a child of another class (which is know as its superclass)

Back

nil

Front

indicates that a value is missing

Back

Memberwise initializer

Front

When you create a new instance of a structure, Swift automatically creates a _______ — which you can then use to set each property on the new instance by name.

Back

table view

Front

user interface displays several items or records as a list.

Back

downcasting

Front

to cast an object to a more specific type — for example, casting from a generic Any to an Int, or from a superclass to a subclass.

Back

comparable

Front

allows you to define how instances of the same type are sorted.

Back

protocol

Front

is a blueprint of methods, properties, and other requirements that suit a particular task or piece of functionality.

Back

conditional cast

Front

casts an instance to the specified type only if it's possible to do so.

Back