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InputTextView Comments

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This commit is contained in:
Nathan Tannar
2017-10-20 22:10:23 -07:00
parent 5d058cb8dc
commit bb6de4e7bc
1 changed files with 97 additions and 45 deletions
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Sources/Views/InputTextView.swift
+97 -45
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@@ -24,10 +24,32 @@
import UIKit
/**
A UITextView that has a UILabel embedded for placeholder text
## Important Notes ##
1. Changing the font, textAlignment or textContainerInset automatically performs the same modifications to the placeholderLabel
2. Intended to be used in an `MessageInputBar`
3. Default placeholder text is "New Message"
4. Will pass a pasted image it's `MessageInputBar`'s `InputManager`s
*/
open class InputTextView: UITextView {
// MARK: - Properties
open override var text: String! {
didSet {
textViewTextDidChange()
}
}
open override var attributedText: NSAttributedString! {
didSet {
textViewTextDidChange()
}
}
/// A UILabel that holds the InputTextView's placeholder text
open let placeholderLabel: UILabel = {
let label = UILabel()
label.numberOfLines = 0
@@ -38,47 +60,51 @@ open class InputTextView: UITextView {
return label
}()
open override var text: String! {
didSet {
placeholderLabel.isHidden = !text.isEmpty
}
}
private var placeholderLabelConstraintSet: NSLayoutConstraintSet?
/// The placeholder text that appears when there is no text
open var placeholder: String? = "New Message" {
didSet {
placeholderLabel.text = placeholder
}
}
/// The placeholderLabel's textColor
open var placeholderTextColor: UIColor? = .lightGray {
didSet {
placeholderLabel.textColor = placeholderTextColor
}
}
open override var font: UIFont! {
didSet {
placeholderLabel.font = font
}
}
open override var textAlignment: NSTextAlignment {
didSet {
placeholderLabel.textAlignment = textAlignment
}
}
/// The UIEdgeInsets the placeholderLabel has within the InputTextView
open var placeholderLabelInsets: UIEdgeInsets = UIEdgeInsets(top: 4, left: 7, bottom: 4, right: 7) {
didSet {
updateConstraintsForPlaceholderLabel()
}
}
/// The font of the InputTextView. When set the placeholderLabel's font is also updated
open override var font: UIFont! {
didSet {
placeholderLabel.font = font
}
}
/// The textAlignment of the InputTextView. When set the placeholderLabel's textAlignment is also updated
open override var textAlignment: NSTextAlignment {
didSet {
placeholderLabel.textAlignment = textAlignment
}
}
/// The textContainerInset of the InputTextView. When set the placeholderLabelInsets is also updated
open override var textContainerInset: UIEdgeInsets {
didSet {
placeholderLabelInsets = textContainerInset
}
}
open override var scrollIndicatorInsets: UIEdgeInsets {
didSet {
// When .zero a rendering issue can occur when the MessagesViewController is pushed onto a UINavigationController stack, popped and then pushed again
// When .zero a rendering issue can occur
if scrollIndicatorInsets == .zero {
scrollIndicatorInsets = UIEdgeInsets(top: .leastNonzeroMagnitude,
left: .leastNonzeroMagnitude,
@@ -87,27 +113,38 @@ open class InputTextView: UITextView {
}
}
}
public weak var messageInputBar: MessageInputBar?
/// A weak reference to the MessageInputBar that the InputTextView is contained within
open weak var messageInputBar: MessageInputBar?
/// The constraints of the placeholderLabel
private var placeholderLabelConstraintSet: NSLayoutConstraintSet?
// MARK: - Initializers
public convenience init() {
self.init(frame: .zero)
}
public override init(frame: CGRect, textContainer: NSTextContainer?) {
super.init(frame: frame, textContainer: textContainer)
setup()
}
required public init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
setup()
}
deinit {
NotificationCenter.default.removeObserver(self)
}
// MARK: - Setup
/// Sets up the default properties
open func setup() {
font = UIFont.preferredFont(forTextStyle: .body)
textContainerInset = UIEdgeInsets(top: 4, left: 4, bottom: 4, right: 4)
scrollIndicatorInsets = UIEdgeInsets(top: .leastNonzeroMagnitude,
@@ -118,18 +155,14 @@ open class InputTextView: UITextView {
layer.cornerRadius = 5.0
layer.borderWidth = 1.25
layer.borderColor = UIColor.lightGray.cgColor
addSubviews()
addConstraints()
addObservers()
addPlaceholderLabel()
}
private func addSubviews() {
/// Adds the placeholderLabel to the view and sets up its initial constraints
private func addPlaceholderLabel() {
addSubview(placeholderLabel)
}
private func addConstraints() {
placeholderLabelConstraintSet = NSLayoutConstraintSet(
top: placeholderLabel.topAnchor.constraint(equalTo: topAnchor, constant: placeholderLabelInsets.top),
bottom: placeholderLabel.bottomAnchor.constraint(equalTo: bottomAnchor, constant: -placeholderLabelInsets.bottom),
@@ -137,12 +170,31 @@ open class InputTextView: UITextView {
width: placeholderLabel.widthAnchor.constraint(equalTo: widthAnchor, constant: -(placeholderLabelInsets.left + placeholderLabelInsets.right))
).activate()
}
/// Updates the placeholderLabels constraint constants to match the placeholderLabelInsets
private func updateConstraintsForPlaceholderLabel() {
placeholderLabelConstraintSet?.top?.constant = placeholderLabelInsets.top
placeholderLabelConstraintSet?.bottom?.constant = -placeholderLabelInsets.bottom
placeholderLabelConstraintSet?.left?.constant = placeholderLabelInsets.left
placeholderLabelConstraintSet?.width?.constant = -(placeholderLabelInsets.left + placeholderLabelInsets.right)
}
/// Adds a notification for .UITextViewTextDidChange to detect when the placeholderLabel
/// should be hidden or shown
private func addObservers() {
NotificationCenter.default.addObserver(self,
selector: #selector(InputTextView.textViewTextDidChange),
name: Notification.Name.UITextViewTextDidChange,
object: nil)
}
// MARK: - Notifications
/// Updates the placeholderLabel's isHidden property based on the text being empty or not
@objc
open func textViewTextDidChange() {
placeholderLabel.isHidden = !text.isEmpty
}
}