Get string from substring - ios

Question

I have following string "#[Hema](hema_ramburuth), #[Ilesh P](ilesh.panchal), #[Lewis Murphy](lewis) how are you?". I want to display this screen like this "Hema, Ilesh P, Lewis Murphy how are you?" also I want to identify the screen for the click event.
I have used the ActiveLabel repo for the click.

Answer 1

Hey I have had encountered a similar requirement. So this is how I have handled.
I have created an extension for String
extension String {
/// Returns range of text in the string
func getRange(OfText text: String) -> NSRange {
let nsRepresentation = self as NSString
return nsRepresentation.range(of: text)
}
}
In your View Controller,
var tapPrivacyGesture = UITapGestureRecognizer()
#IBOutlet weak var yourLabel: UILabel!
var displayText = String()
func matchesForRegexInText(regex: String, text: String, firstBracket: String, lastBracket: String) -> [String] {
do {
let regex = try NSRegularExpression(pattern: regex, options: [])
let nsString = text as NSString
let results = regex.matches(
in: text,
options: [],
range: NSRange(location: 0, length: nsString.length))
return results.map { nsString.substring(with: $0.range) }.map { $0.replacingOccurrences(of: firstBracket, with: "") }.map { $0.replacingOccurrences(of: lastBracket, with: "") }
} catch let error as NSError {
print("invalid regex: \(error.localizedDescription)")
return []
}
}
var givenString = "#[Hema](hema_ramburuth), #[Ilesh P](ilesh.panchal), #[Lewis Murphy](lewis) how are you?"
let nameStrings = matchesForRegexInText(regex: "\\[(.*?)\\]", text: givenString, firstBracket: "[", lastBracket: "]")
let removeForUIStrings = matchesForRegexInText(regex: "\\((.*?)\\)", text: givenString, firstBracket: "(", lastBracket: ")")
removeForUIStrings.forEach {
givenString = givenString.replacingOccurrences(of: "(\($0))", with: "")
}
nameStrings.forEach {
givenString = givenString.replacingOccurrences(of: "[\($0)]", with: $0)
}
givenString = givenString.replacingOccurrences(of: "#", with: "")
print(givenString)
displayText = givenString
tapPrivacyGesture.addTarget(self, action: #selector(self.handlePolicyTap(tap:)))
yourLabel.addGestureRecognizer(tapPrivacyGesture)
yourLabel.isUserInteractionEnabled = true
func handlePolicyTap(tap: UITapGestureRecognizer) {
let storage = NSTextStorage(attributedString: yourLabel.attributedText ?? NSAttributedString())
let layoutManager = NSLayoutManager()
storage.addLayoutManager(layoutManager)
let textContainer = NSTextContainer(size: CGSize(width: yourLabel.frame.size.width, height: yourLabel.frame.size.height+100))
textContainer.lineFragmentPadding = 0.0
textContainer.lineBreakMode = (yourLabel.lineBreakMode)
textContainer.maximumNumberOfLines = yourLabel.numberOfLines
layoutManager.addTextContainer(textContainer)
let location: CGPoint = tap.location(in: yourLabel)
let characterIndex: Int = layoutManager.characterIndex(for: location, in: textContainer, fractionOfDistanceBetweenInsertionPoints: nil)
guard
characterIndex < storage.length,
let question = currentQuestion else {
return
}
nameStrings.forEach {
let range = displayText.getRange(OfText: $0)
if range.contains(characterIndex) {
/// Perform actions on click of this string
}
}
}

Answer 2

As from your question, just hard-code parsing done below.
let fullString = "#[Hema](hema_ramburuth), #[Ilesh P](ilesh.panchal), #[Lewis Murphy](lewis) how are you?"
let allarray = fullString.split(separator: ",")
let messageArray = allarray.last
let message = messageArray?.split(separator: ")")
let correctMessage = message?.last
var allNames : String = ""
for namesString in allarray {
if allNames.count > 0 {
allNames += ", "
}
let name = String(namesString)
allNames += name.slice(from: "#[", to: "]") ?? ""
}
if allNames.count > 0 {
allNames += correctMessage ?? ""
}
print("Name and Message --- > \(allNames)")
Slicing string using String extension
extension String {
func slice(from: String, to: String) -> String? {
return (range(of: from)?.upperBound).flatMap { substringFrom in
(range(of: to, range: substringFrom..<endIndex)?.lowerBound).map { substringTo in
substring(with: substringFrom..<substringTo)
}
}
}
}
I've printed output as below:
Name and Message --- > Hema, Ilesh P, Lewis Murphy how are you?