135 lines
3.8 KiB
Swift
135 lines
3.8 KiB
Swift
//
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// Copyright (c) 2021 Open Whisper Systems. All rights reserved.
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//
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import Foundation
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public protocol TextFieldWithPlaceholderDelegate: AnyObject {
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func textFieldDidBeginEditing(_ textField: UITextField)
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func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool
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}
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// MARK: -
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public class TextFieldWithPlaceholder: UIView {
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// MARK: - Public Properties
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public weak var delegate: TextFieldWithPlaceholderDelegate?
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public var placeholderText: String = "" {
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didSet {
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placeholderLabel.text = placeholderText
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textfield.accessibilityLabel = placeholderText
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}
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}
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public func acceptAutocorrectSuggestion() {
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textfield.acceptAutocorrectSuggestion()
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}
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public var text: String? {
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get { textfield.text?.nilIfEmpty }
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set {
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textfield.text = newValue
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updatePlaceholderVisibility()
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}
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}
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@discardableResult
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public override func becomeFirstResponder() -> Bool {
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textfield.becomeFirstResponder()
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}
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@discardableResult
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public override func resignFirstResponder() -> Bool {
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textfield.resignFirstResponder()
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}
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public override var canBecomeFirstResponder: Bool {
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textfield.canBecomeFirstResponder
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}
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public override var isFirstResponder: Bool {
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textfield.isFirstResponder
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}
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public var font: UIFont? {
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get { textfield.font }
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set { textfield.font = newValue }
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}
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// MARK: - Private Properties
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private lazy var textfield = UITextField()
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private lazy var placeholderLabel = UILabel()
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// MARK: - Lifecycle
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public override init(frame: CGRect) {
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super.init(frame: frame)
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applyTheme()
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textfield.delegate = self
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placeholderLabel.isUserInteractionEnabled = false
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// The placeholderLabel is perfectly aligned with the textView to allow for us to easily
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// hide/show placeholder text without needing to manipulate the text property of our primary
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// text view. This makes VoiceOver navigation by dragging a bit tricky, since a user won't be
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// able to find the placeholder text. Let's disable it in VoiceOver. Instead, placeholderText
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// will be an accessibility label on the primary text view.
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placeholderLabel.accessibilityElementsHidden = true
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// Layout + Constraints
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for subview in [textfield, placeholderLabel] {
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addSubview(subview)
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subview.autoPinEdgesToSuperviewEdges()
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subview.setCompressionResistanceHigh()
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}
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textfield.addTarget(self, action: #selector(textFieldDidChange), for: .editingChanged)
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NotificationCenter.default.addObserver(self, selector: #selector(applyTheme), name: .ThemeDidChange, object: nil)
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updatePlaceholderVisibility()
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}
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required init?(coder: NSCoder) {
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fatalError("init(coder:) has not been implemented")
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}
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// MARK: -
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@objc
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private func textFieldDidChange(sender: UITextField) {
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Logger.info("")
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updatePlaceholderVisibility()
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}
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private func updatePlaceholderVisibility() {
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placeholderLabel.isHidden = text != nil
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}
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// MARK: - Private
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@objc private func applyTheme() {
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placeholderLabel.textColor = Theme.placeholderColor
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textfield.textColor = Theme.primaryTextColor
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}
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}
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// MARK: -
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extension TextFieldWithPlaceholder: UITextFieldDelegate {
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public func textFieldDidBeginEditing(_ textField: UITextField) {
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delegate?.textFieldDidBeginEditing(textField)
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}
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public func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
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delegate?.textField(textField, shouldChangeCharactersIn: range, replacementString: string) ?? true
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}
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}
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