UIKit Handbook

Original Author: Richie Sun

UIView
An object that manages the content for a rectangular area on the screen. The UIView class defines the behaviors that are common to all views. All following UI elements are a subclass of UIView
let view = UIView()
All UIViews share the following attributes:
Attribute
Type
Description
.alpha
CGFloat
The alpha value of the view.
.backgroundColor
UIColor
The background color of the view.
.bounds
CGRect
The view’s bounded rectangle that describes the view's location and size relative to its own coordinate system (Independent of any other views).
.clipsToBounds
Bool
A boolean value that determines if the view’s subviews are constrained by the bounds of the view.
.frame
CGRect
The view’s frame rectangle that describes the view's location and size relative to its superview’s coordinate system.
.isHidden
Bool
A boolean value that determines if the view is hidden.
.layer.cornerRadius
CGFloat
The radius utilized to round the corners of any view. Setting the corner radius equal to half the width/ height will make the view an ellipse.
.layer.borderColor
CGColor
The color of the view’s border. Note that you are not able to directly specify UIColors like .black. You must use the CGColor equivalent as follows: UIColor.black.cgColor
.layer.borderWidth
CGFloat
The width of the view’s border (in pixels).
.layer.opacity
Float
Specifies the opacity of the view. Value is a floating point number 0..1 inclusive, where 1 indicates an opaque view, and 0 indicates a completely transparent view (basically Hidden).
Text-Based Views
The following views are utilized for displaying text in your views. Whether that be for titles, headers, descriptions, or input text boxes.
All of the views in this section shared the following attributes:
Attribute
Type
Description
.font
UIFont
The font of the text (More setup needed for UITextView).
.text
String?
The text that the label displays.
.textAlignment
NSTextAlignment
The technique for aligning the text (.left, .center, .right).
.textColor
UIColor
The color of the text.
UILabel
A view that displays one or more lines of informational text. Most commonly used to display titles, headers, or short lines of text that are NOT scrollable.
let label = UILabel()
Unique attributes:
Attribute
Type
Description
.numberOfLines
Int
The maximum number of lines for your text. Setting this to 0 will allow any number of lines depending on the constraints
UITextField
An object that displays an editable text area in your interface. Most commonly used to obtain shorter text input from users, as the textField area is NOT scrollable nor multiline
let textField = UITextField()
Unique attributes:
Attribute
Type
Description
.borderStyle
BorderStyle
Specifies the basic border style of the textField. .none, .bezel, .line, .roundedRect are the options offered, but it is always better to use .layer to create custom borders
.delegate
UITextFieldDelegate?
The delegate used to keep track of and manage user interaction with the textField
.keyboardType
UIKeyboardType
Specifies the type of keyboard that the textField pulls up when interacted with. .default, .numberPad, .URL are commonly used
.placeholder
String?
The text string that displays when there is no other text in textField. Often used to indicate what information the user should input
UITextView
A scrollable, multiline text region.
let textView = UITextView()
Unique attributes:
Attribute
Type
Description
.delegate
UITextViewDelegate?
The delegate used to keep track of and manage user interaction with the textView
.keyboardType
UIKeyboardType
Specifies the type of keyboard that the textView pulls up when interacted with. .default, .numberPad, .URL are commonly used
.isEditable
Bool
A Boolean value that indicates whether the textView can be edited
.isScrollEnabled
Bool
A Boolean value that indicates whether the textView is scrollable
.isSelectable
Bool
A Boolean value that indicates whether the textView is selectable. NOTE: This must be set to true if you want to change the font!
More Views Coming Soon!

Attribute	Type	Description
`.alpha`	CGFloat	The alpha value of the view.
`.backgroundColor`	UIColor	The background color of the view.
`.bounds`	CGRect	The view’s bounded rectangle that describes the view's location and size relative to its own coordinate system (Independent of any other views).
`.clipsToBounds`	Bool	A boolean value that determines if the view’s subviews are constrained by the bounds of the view.
`.frame`	CGRect	The view’s frame rectangle that describes the view's location and size relative to its superview’s coordinate system.
`.isHidden`	Bool	A boolean value that determines if the view is hidden.
`.layer.cornerRadius`	CGFloat	The radius utilized to round the corners of any view. Setting the corner radius equal to half the width/ height will make the view an ellipse.
`.layer.borderColor`	CGColor	The color of the view’s border. Note that you are not able to directly specify UIColors like `.black`. You must use the CGColor equivalent as follows: `UIColor.black.cgColor`
`.layer.borderWidth`	CGFloat	The width of the view’s border (in pixels).
`.layer.opacity`	Float	Specifies the opacity of the view. Value is a floating point number 0..1 inclusive, where 1 indicates an opaque view, and 0 indicates a completely transparent view (basically Hidden).

Attribute	Type	Description
`.font`	UIFont	The font of the text (More setup needed for UITextView).
`.text`	String?	The text that the label displays.
`.textAlignment`	NSTextAlignment	The technique for aligning the text (`.left`, `.center`, `.right`).
`.textColor`	UIColor	The color of the text.

Attribute	Type	Description
`.numberOfLines`	Int	The maximum number of lines for your text. Setting this to 0 will allow any number of lines depending on the constraints

Attribute	Type	Description
`.borderStyle`	BorderStyle	Specifies the basic border style of the textField. `.none`, `.bezel`, `.line`, `.roundedRect` are the options offered, but it is always better to use .layer to create custom borders
`.delegate`	UITextFieldDelegate?	The delegate used to keep track of and manage user interaction with the textField
`.keyboardType`	UIKeyboardType	Specifies the type of keyboard that the textField pulls up when interacted with. `.default`, `.numberPad`, `.URL` are commonly used
`.placeholder`	String?	The text string that displays when there is no other text in textField. Often used to indicate what information the user should input

Attribute	Type	Description
`.delegate`	UITextViewDelegate?	The delegate used to keep track of and manage user interaction with the textView
`.keyboardType`	UIKeyboardType	Specifies the type of keyboard that the textView pulls up when interacted with. `.default`, `.numberPad`, `.URL` are commonly used
`.isEditable`	Bool	A Boolean value that indicates whether the textView can be edited
`.isScrollEnabled`	Bool	A Boolean value that indicates whether the textView is scrollable
`.isSelectable`	Bool	A Boolean value that indicates whether the textView is selectable. NOTE: This must be set to true if you want to change the font!

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