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class RNUITextView: UIView {
var textView: UITextView
@objc var numberOfLines: Int = 0 {
didSet {
textView.textContainer.maximumNumberOfLines = numberOfLines
}
}
@objc var selectable: Bool = true {
didSet {
textView.isSelectable = selectable
}
}
@objc var ellipsizeMode: String = "tail" {
didSet {
textView.textContainer.lineBreakMode = self.getLineBreakMode()
}
}
@objc var onTextLayout: RCTDirectEventBlock?
override init(frame: CGRect) {
if #available(iOS 16.0, *) {
textView = UITextView(usingTextLayoutManager: false)
} else {
textView = UITextView()
}
// Disable scrolling
textView.isScrollEnabled = false
// Remove all the padding
textView.textContainerInset = .zero
textView.textContainer.lineFragmentPadding = 0
// Remove other properties
textView.isEditable = false
textView.backgroundColor = .clear
// Init
super.init(frame: frame)
self.clipsToBounds = true
// Add the view
addSubview(textView)
let tapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(callOnPress(_:)))
tapGestureRecognizer.isEnabled = true
textView.addGestureRecognizer(tapGestureRecognizer)
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
// Resolves some animation issues
override func reactSetFrame(_ frame: CGRect) {
UIView.performWithoutAnimation {
super.reactSetFrame(frame)
}
}
func setText(string: NSAttributedString, size: CGSize, numberOfLines: Int) -> Void {
self.textView.frame.size = size
self.textView.textContainer.maximumNumberOfLines = numberOfLines
self.textView.attributedText = string
self.textView.selectedTextRange = nil
if let onTextLayout = self.onTextLayout {
var lines: [String] = []
textView.layoutManager.enumerateLineFragments(
forGlyphRange: NSRange(location: 0, length: textView.attributedText.length))
{ (rect, usedRect, textContainer, glyphRange, stop) in
let characterRange = self.textView.layoutManager.characterRange(forGlyphRange: glyphRange, actualGlyphRange: nil)
let line = (self.textView.text as NSString).substring(with: characterRange)
lines.append(line)
}
onTextLayout([
"lines": lines
])
}
}
@IBAction func callOnPress(_ sender: UITapGestureRecognizer) -> Void {
// If we find a child, then call onPress
if let child = getPressed(sender) {
if textView.selectedTextRange == nil, let onPress = child.onPress {
onPress(["": ""])
} else {
// Clear the selected text range if we are not pressing on a link
textView.selectedTextRange = nil
}
}
}
// Try to get the pressed segment
func getPressed(_ sender: UITapGestureRecognizer) -> RNUITextViewChild? {
let layoutManager = textView.layoutManager
var location = sender.location(in: textView)
// Remove the padding
location.x -= textView.textContainerInset.left
location.y -= textView.textContainerInset.top
// Get the index of the char
let charIndex = layoutManager.characterIndex(
for: location,
in: textView.textContainer,
fractionOfDistanceBetweenInsertionPoints: nil
)
var lastUpperBound: String.Index? = nil
for child in self.reactSubviews() {
if let child = child as? RNUITextViewChild, let childText = child.text {
let fullText = self.textView.attributedText.string
// We want to skip over the children we have already checked, otherwise we could run into
// collisions of similar strings (i.e. links that get shortened to the same hostname but
// different paths)
let range = fullText.range(of: childText, options: [], range: (lastUpperBound ?? String.Index(utf16Offset: 0, in: fullText) )..<fullText.endIndex)
if let lowerBound = range?.lowerBound, let upperBound = range?.upperBound {
let lowerOffset = lowerBound.utf16Offset(in: fullText)
let upperOffset = upperBound.utf16Offset(in: fullText)
if charIndex >= lowerOffset,
charIndex <= upperOffset
{
return child
} else {
lastUpperBound = upperBound
}
}
}
}
return nil
}
func getLineBreakMode() -> NSLineBreakMode {
switch self.ellipsizeMode {
case "head":
return .byTruncatingHead
case "middle":
return .byTruncatingMiddle
case "tail":
return .byTruncatingTail
case "clip":
return .byClipping
default:
return .byTruncatingTail
}
}
}
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