##The Problem UILabel and UITextView offer unsatisfying support for text selection.

Existing solutions like TTTAttributedLabel are great but offer a somewhat limited API for text selection.

##Features

• Text Selection
• Text Expansion
• Customization
• Prewritten Selection Validators
• Interface Builder
• Scrolling

##Installation

####CocoaPods

Add the following to your Podfile

pod 'SelectableTextView', '~> 0.0.1'

####Carthage

Add the following to your Cartfile

github "jhurray/SelectableTextView" ~> 0.0.1

####Add to project Manually Clone the repo and manually add the Files in /SelectableTextView

##Usage

import SelectableTextView

let textView = SelectableTextView()
textView.text = "Hello World!"
textView.truncationMode = .truncateTail
textView.alignment = .center
textView.numberOfLines = 1

let greetingValidator = MatchesTextValidator(text: "hello")
textView.registerValidator(validator: greetingValidator) { (validText, validator) in
	// Handle selection of "Hello"
}

let exclamationValidator = SuffixValidator(suffix: "!")
textView.registerValidator(validator: exclamationValidator) { (validText, validator) in
	// Handle selection of "World!"
}

##Text Selection

To create selectable text, you have to create and register a validator. The validator must conform to the TextSelectionValidator protocol.

let hashtagValidator = PrefixValidator(prefix: "#")
textView.registerValidator(validator: hashtagValidator) { (validText, validator) in
	// Handle selection of hashtag
}

You can unregister a validator at any time.

textView.removeValidator(validator: hashtagValidator)

###Custom Validators

Here is a resource for creating custom validators using the TextSelectionValidator protocol.

There are other more specific protocols that make customization easier like ContainerTextSelectionValidator and CompositeTextSelectionValidator.

###Prewritten Validators

There are a few prewritten validators supplied. These can be used as they are, as building blocks for other more complex validators, and as examples on how to build custom validators.

#####Text Validators

MatchesTextValidator(text: String, caseSensitive: Bool = false)

ContainsTextValidator(text: String, caseSensitive: Bool = false)

PrefixValidator(text: String, caseSensitive: Bool = false)

SuffixValidator(text: String, caseSensitive: Bool = false)

HashtagTextValidator()

AtSymbolTagTextValidator()

QuotationsTextValidator()

HandlebarsValidator(searchableText: String, replacementText: String)

#####Abstract Validators

ReverseValidator(validator: TextSelectionValidator)

ContainerValidator(validator: TextSelectionValidator, selectionAttributes: [String: Any]? = nil)

CompositeValidator(validators: [TextSelectionValidator], selectionAttributes: [String: Any]? = nil)

#####Link Validators

LinkValidator() // Validates any link (HTTP, HTTPS, file, etc...)

HTTPLinkValidator() // Validates HTTP and HTTPS links

UnsafeLinkValidator() // Validates HTTP links

HTTPSLinkValidator()

CustomLinkValidator(urlString: String!, replacementText: String? = nil) 

Customization is possible using the LinkValidatorAttributes protocol. Example here.

#####Regex Validators

RegexValidator(pattern: String, options: NSRegularExpression.Options = .caseInsensitive)

EmailValidator()

PhoneNumberValidator()

##Text Expansion

You can add a text expansion button with the following method:

public func addExpansionButton(collapsedState: (text: String, lines: Int), expandedState: (text: String, lines: Int), attributes: [String: Any]? = nil)

You can remove the expansion button using the following method:

public func removeExpansionButton(numberOfLines: Int = 1)

Example:

let attributes = [NSForegroundColorAttributeName: purple]
textView.addExpansionButton(collapsedState: ("More...", 2),
                             expandedState: ("Less", 0),
                                attributes: attributes)
                                
...

textView.removeExpansionButton(numberOfLines: 2)

You can customize the background color of the expansion button using the SelectedBackgroundColorAttribute property HighlightedTextSelectionAttributes struct as an attribute key.

let attributes: [String: Any] = [HighlightedTextSelectionAttributes.SelectedBackgroundColorAttribute : UIColor.purple]

##Customization

####text

• Sets the content of the text view
• Type: String?

####font

• Sets the font of the text view
• Type: UIFont
• Defaults to UIFont.systemFont(ofSize: 17)

####textColor

• Sets the default text color
• Type: UIColor
• Defaults to UIColor.darkText

####attributedText

• Overrides the text and textColor with the attributed text
• Type: NSAttributedString?
• Defaults to nil

####textAlignment

• Alignment of text in the text view
• Type: TextAlignment
• Supports 3 types: .left, .right, .center
• Defaults to .left

####lineBreakMode

• Determines how the text view handles new lines
• Type: LineBreakMode
• Supports 1 type: .wordWrap
• • Defaults to . wordWrap
• See Goals

####truncationMode

• Determines the bahavior of the last word in the last line of the text view
• Type: TruncationMode
• Supports 2 types: .clipping, .truncateTail
• Defaults to .clipping
• See Goals

####numberOfLines

• Determines the number of lines in the text view
• Type: Int
• Defaults to 0
• 0 lines means unbounded, similar to UILabel

####lineSpacing

• Determines the spacing between lines
• Type: CGFloat
• Defaults to 0
• Supports negative values

####textContainerInsets

• Sets the content inset of the text view
• Type: UIEdgeInsets
• Defaults to UIEdgeInsets.zero

####selectionAttributes

• Sets the default selection attributes for selectable text
• Type: [String : AnyObject]?
• Defaults: color = tintColor, font = boldSystemFont(ofSize: font.pointSize + 2)

####isExpanded

• Tracks the state of the expansion button
• Type: Bool?
• Defaults to nil. Will only return a value if the expansion button is added
• If the expansion button is added, this property will toggle the state

####textContentSize

• Readonly, returns the size of the text content
• Type: CGSize

####isSelectionEnabled

• Determines if selection is enabled for the text view
• Type: Bool
• Defaults to true

####isScrollEnabled

• Determines if scrolling is enabled for the text view
• Type: Bool
• Defaults to false

####scrollDelegate

• Forwards scrolling events fron the text view
• Type: SelectableTextViewDelegate?

####delegate

• Delegates work for the text view
• Type: SelectableTextViewScrollDelegate?

##Supported Escape Characters

• New Line \n
• Tab \t
• Null Terminator \0

If you want to have text next to to a selectabe portion of text but still validate the text correctly, use the null terminator.

let text = "The period next to the #Hashtag\0. Will not be highlighted if I use a hashtag validator."

##Miscelaneous

#####framesOfWordsMatchingValidator You can get the relative frames of words within the text view with the method below. This is how I set up the stars effect in the first example gif.

public func framesOfWordsMatchingValidator(validator: TextSelectionValidator) -> [CGRect]

#####Tab Length

You can adjust the number of spaces a tab character creates using TabTextModelConfig.numberOfSpaces. The default value is 4.

TabTextModelConfig.numberOfSpaces = 2

##Interface Builder

You can set most customization properties via interface builder. SelectableTextView is marked as @IBDesignable.

• numberOfLines: Int
• text: String
• textColor: UIColor
• lineSpacing: Float
• isSelectionEnabled: Bool
• isScrollEnabled: Bool
• fontSize: Float
• truncateTail: Bool
• topTextInsets: Float
• bottomTextInsets: Float
• leftTextInsets: Float
• rightTextInsets: Float

##Delegate

Default implementations are provided for all SelectableTextViewDelegate methods.

public protocol SelectableTextViewDelegate: class {
    
    /// Resolves conflict between multiple validates that return `true` from their `validate:` method
    //
    // i.e. PrefixTextValidator for `#` and `#my` will both return true for `#myCoolHashtag`,
    // but the actions they are registered for may differ
    //
    /// Default behavior is to choose the first validator in the composite validator's `validators` array
    func resolveValidationConflictsForSelectableTextView(textView: SelectableTextView, conflictingValidators: [TextSelectionValidator]) -> TextSelectionValidator
    
    /// Defaults to `false`
    func animateExpansionButtonForSelectableTextView(textView: SelectableTextView) -> Bool
    
    /// Defaults to `.truncateTail`
    func truncationModeForWordsThatDontFitForSelectableTextView(textView: SelectableTextView) -> TruncationMode
    
    /// Optional, Default empty implementation provideed
    func selectableTextViewContentHeightDidChange(textView: SelectableTextView, oldHeight: CGFloat, newHeight: CGFloat)
}

##Scrolling

SelectableTextView supports scrolling and forwards scroll events through SelectableTextViewScrollDelegate.

public protocol SelectableTextViewScrollDelegate: class {
    
    func selectableTextViewDidScroll(_ scrollView: UIScrollView)
    func selectableTextViewWillBeginDragging(_ scrollView: UIScrollView)
    func selectableTextViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>)
    func selectableTextViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate decelerate: Bool)
    func selectableTextViewWillBeginDecelerating(_ scrollView: UIScrollView)
    func selectableTextViewDidEndDecelerating(_ scrollView: UIScrollView)
    func selectableTextViewDidEndScrollingAnimation(_ scrollView: UIScrollView)
}

You can also scroll to specific words or the first word that passes a validator.

/// Scrolls to the first instance of the word
/// Attempts to match the text and display text of a word
public func scrollToWord(_ word: String, position: ScrollPosition, animated: Bool)
    
   /// Scrolls to the first instance of a word that passes the provided TextSelectionValidator
public func scrollToWordPassingValidator(_ validator: TextSelectionValidator, position: ScrollPosition, animated: Bool)

##Goals

• Character wrapping
• More truncation styles: .head, .center

##Contact Info && Contributing

Feel free to email me at jhurray33@gmail.com. I'd love to hear your thoughts on this, or see examples where this has been used.

MIT License