I have implemented the shouldChangeCharactersIn textfield delegate method. I have formatted the value in textfield so that textfield string becomes a comma separated currency type value. For that, I am explicitly handling the cursor to support conditions like inserting 2 commas at a time. The code used is :
let textBeforeEditing = textField.text!
if ((string == "0" || string == "") && (textField.text! as NSString).range(of: ".").location < range.location) {
return true
}
var currentPosition = 0
if let selectedRange = textField.selectedTextRange {
currentPosition = textField.offset(from: textField.beginningOfDocument, to: string == "" ? selectedRange.end : selectedRange.start)
}
let allowedCharacterSet = NSCharacterSet(charactersIn: "0123456789.").inverted
let filtered = string.components(separatedBy: allowedCharacterSet)
let component = filtered.joined(separator: "")
let isNumeric = string.replacingOccurrences(of: ",", with: "") == component
var textFieldString : String = ""
var numberWithoutCommas : String = ""
guard isNumeric else {
return false
}
let formatter = NumberFormatter()
formatter.numberStyle = .decimal
textFieldString = (textField.text! as NSString).replacingCharacters(in: range, with: string)
numberWithoutCommas = textFieldString.replacingOccurrences(of: ",", with: "")
let formattedNumberWithoutCommas = formatter.number(from: numberWithoutCommas)
guard let formattedNumber = formattedNumberWithoutCommas, var formattedString = formatter.string(from: formattedNumber) else {
textField.text = nil
return false
}
if string == "." && range.location == textField.text?.count {
formattedString = formattedString.appending(".")
}
var filteredRegex = [NSTextCheckingResult]()
filteredRegex = Constant.Regex.decimalRegex.matches(in: formattedString, options: [], range: NSMakeRange(0, formattedString.count))
guard filteredRegex.count == 1 else {
return false
}
textField.text = formattedString
currentPosition = getCursorPositionForTextField(string: string, cursorPosition: currentPosition, formattedString: formattedString, textBeforeEditing: textBeforeEditing)
handleTextFieldCursor(cursorPosition: currentPosition, textField: textField)
return false
So when I type 1234567890, it gets formatted to 1,234,567,890
The issue here is that when I cut any characters from textfield, I am unable to paste it anywhere else. I am unable to detect the reason why it isn't getting pasted. Please could someone help me out.
Is there any way to detect the cut operation for the same? Cut operation is getting overridden by the above code it seems.
For example string = "Hello #manan123 and #man"
i am doing tagging functionality in textview and i want when user press backspace if word contains # then whole word will delete not single character.
but i am facing problem while two tagged word have same characters. So in above example when i am trying to delete last word #man then #manan123 also convert to the an123.
Here is my code on textview delegate method
func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
if text == "" {
if let selectedRange = textView.selectedTextRange {
let cursorOffset = textView.offset(from: textView.beginningOfDocument, to: selectedRange.start)
if let myText = textView.text {
let index = myText.index(myText.startIndex, offsetBy: cursorOffset)
let substring = myText[..<index]
if let lastword = substring.components(separatedBy: " ").last {
if lastword.hasPrefix("#") {
//Check complete word
let completeLastword = myText.components(separatedBy: " ").filter{$0.contains(lastword)}.last
textView.text = myText.replacingOccurrences(of: completeLastword!, with: "")
return false
}
}
}
}
}
return true
}
Hi I have updated your code please check it.
if text == "" {
if let selectedRange = textView.selectedTextRange {
let cursorOffset = textView.offset(from: textView.beginningOfDocument, to: selectedRange.start)
if let myText = textView.text {
let index = myText.index(myText.startIndex, offsetBy: cursorOffset)
let substring = myText[..<index]
if let lastword = substring.components(separatedBy: " ").last {
if lastword.hasPrefix("#") {
var newText = myText
let start = newText.index(myText.startIndex, offsetBy: cursorOffset - lastword.count);
let end = newText.index(myText.startIndex, offsetBy: (cursorOffset - lastword.count) + lastword.count);
newText.replaceSubrange(start..<end, with: "")
textView.text = newText
return false
}
}
}
}
}
Hope this helps.
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.
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
}
}
}
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?
Problem: NSAttributedString takes an NSRange while I'm using a Swift String that uses Range
let text = "Long paragraph saying something goes here!"
let textRange = text.startIndex..<text.endIndex
let attributedString = NSMutableAttributedString(string: text)
text.enumerateSubstringsInRange(textRange, options: NSStringEnumerationOptions.ByWords, { (substring, substringRange, enclosingRange, stop) -> () in
if (substring == "saying") {
attributedString.addAttribute(NSForegroundColorAttributeName, value: NSColor.redColor(), range: substringRange)
}
})
Produces the following error:
error: 'Range' is not convertible to 'NSRange'
attributedString.addAttribute(NSForegroundColorAttributeName, value: NSColor.redColor(), range: substringRange)
Swift String ranges and NSString ranges are not "compatible".
For example, an emoji like 😄 counts as one Swift character, but as two NSString
characters (a so-called UTF-16 surrogate pair).
Therefore your suggested solution will produce unexpected results if the string
contains such characters. Example:
let text = "😄😄😄Long paragraph saying!"
let textRange = text.startIndex..<text.endIndex
let attributedString = NSMutableAttributedString(string: text)
text.enumerateSubstringsInRange(textRange, options: NSStringEnumerationOptions.ByWords, { (substring, substringRange, enclosingRange, stop) -> () in
let start = distance(text.startIndex, substringRange.startIndex)
let length = distance(substringRange.startIndex, substringRange.endIndex)
let range = NSMakeRange(start, length)
if (substring == "saying") {
attributedString.addAttribute(NSForegroundColorAttributeName, value: NSColor.redColor(), range: range)
}
})
println(attributedString)
Output:
😄😄😄Long paragra{
}ph say{
NSColor = "NSCalibratedRGBColorSpace 1 0 0 1";
}ing!{
}
As you see, "ph say" has been marked with the attribute, not "saying".
Since NS(Mutable)AttributedString ultimately requires an NSString and an NSRange, it is actually
better to convert the given string to NSString first. Then the substringRange
is an NSRange and you don't have to convert the ranges anymore:
let text = "😄😄😄Long paragraph saying!"
let nsText = text as NSString
let textRange = NSMakeRange(0, nsText.length)
let attributedString = NSMutableAttributedString(string: nsText)
nsText.enumerateSubstringsInRange(textRange, options: NSStringEnumerationOptions.ByWords, { (substring, substringRange, enclosingRange, stop) -> () in
if (substring == "saying") {
attributedString.addAttribute(NSForegroundColorAttributeName, value: NSColor.redColor(), range: substringRange)
}
})
println(attributedString)
Output:
😄😄😄Long paragraph {
}saying{
NSColor = "NSCalibratedRGBColorSpace 1 0 0 1";
}!{
}
Update for Swift 2:
let text = "😄😄😄Long paragraph saying!"
let nsText = text as NSString
let textRange = NSMakeRange(0, nsText.length)
let attributedString = NSMutableAttributedString(string: text)
nsText.enumerateSubstringsInRange(textRange, options: .ByWords, usingBlock: {
(substring, substringRange, _, _) in
if (substring == "saying") {
attributedString.addAttribute(NSForegroundColorAttributeName, value: NSColor.redColor(), range: substringRange)
}
})
print(attributedString)
Update for Swift 3:
let text = "😄😄😄Long paragraph saying!"
let nsText = text as NSString
let textRange = NSMakeRange(0, nsText.length)
let attributedString = NSMutableAttributedString(string: text)
nsText.enumerateSubstrings(in: textRange, options: .byWords, using: {
(substring, substringRange, _, _) in
if (substring == "saying") {
attributedString.addAttribute(NSForegroundColorAttributeName, value: NSColor.red, range: substringRange)
}
})
print(attributedString)
Update for Swift 4:
As of Swift 4 (Xcode 9), the Swift standard library
provides method to convert between Range<String.Index> and NSRange.
Converting to NSString is no longer necessary:
let text = "😄😄😄Long paragraph saying!"
let attributedString = NSMutableAttributedString(string: text)
text.enumerateSubstrings(in: text.startIndex..<text.endIndex, options: .byWords) {
(substring, substringRange, _, _) in
if substring == "saying" {
attributedString.addAttribute(.foregroundColor, value: NSColor.red,
range: NSRange(substringRange, in: text))
}
}
print(attributedString)
Here substringRange is a Range<String.Index>, and that is converted to the
corresponding NSRange with
NSRange(substringRange, in: text)
For cases like the one you described, I found this to work. It's relatively short and sweet:
let attributedString = NSMutableAttributedString(string: "follow the yellow brick road") //can essentially come from a textField.text as well (will need to unwrap though)
let text = "follow the yellow brick road"
let str = NSString(string: text)
let theRange = str.rangeOfString("yellow")
attributedString.addAttribute(NSForegroundColorAttributeName, value: UIColor.yellowColor(), range: theRange)
The answers are fine, but with Swift 4 you could simplify your code a bit:
let text = "Test string"
let substring = "string"
let substringRange = text.range(of: substring)!
let nsRange = NSRange(substringRange, in: text)
Be cautious, as the result of range function has to be unwrapped.
Possible Solution
Swift provides distance() which measures the distance between start and end that can be used to create an NSRange:
let text = "Long paragraph saying something goes here!"
let textRange = text.startIndex..<text.endIndex
let attributedString = NSMutableAttributedString(string: text)
text.enumerateSubstringsInRange(textRange, options: NSStringEnumerationOptions.ByWords, { (substring, substringRange, enclosingRange, stop) -> () in
let start = distance(text.startIndex, substringRange.startIndex)
let length = distance(substringRange.startIndex, substringRange.endIndex)
let range = NSMakeRange(start, length)
// println("word: \(substring) - \(d1) to \(d2)")
if (substring == "saying") {
attributedString.addAttribute(NSForegroundColorAttributeName, value: NSColor.redColor(), range: range)
}
})
For me this works perfectly:
let font = UIFont.systemFont(ofSize: 12, weight: .medium)
let text = "text"
let attString = NSMutableAttributedString(string: "exemple text :)")
attString.addAttributes([.font: font], range:(attString.string as NSString).range(of: text))
label.attributedText = attString
Swift 4:
Sure, I know that Swift 4 has an extension for NSRange already
public init<R, S>(_ region: R, in target: S) where R : RangeExpression,
S : StringProtocol,
R.Bound == String.Index, S.Index == String.Index
I know in most cases this init is enough. See its usage:
let string = "Many animals here: 🐶🦇🐱 !!!"
if let range = string.range(of: "🐶🦇🐱"){
print((string as NSString).substring(with: NSRange(range, in: string))) // "🐶🦇🐱"
}
But conversion can be done directly from Range< String.Index > to NSRange without Swift's String instance.
Instead of generic init usage which requires from you the target parameter as String and
if you don't have target string at hand you can create conversion directly
extension NSRange {
public init(_ range:Range<String.Index>) {
self.init(location: range.lowerBound.encodedOffset,
length: range.upperBound.encodedOffset -
range.lowerBound.encodedOffset) }
}
or you can create the specialized extension for Range itself
extension Range where Bound == String.Index {
var nsRange:NSRange {
return NSRange(location: self.lowerBound.encodedOffset,
length: self.upperBound.encodedOffset -
self.lowerBound.encodedOffset)
}
}
Usage:
let string = "Many animals here: 🐶🦇🐱 !!!"
if let range = string.range(of: "🐶🦇🐱"){
print((string as NSString).substring(with: NSRange(range))) // "🐶🦇🐱"
}
or
if let nsrange = string.range(of: "🐶🦇🐱")?.nsRange{
print((string as NSString).substring(with: nsrange)) // "🐶🦇🐱"
}
Swift 5:
Due to the migration of Swift strings to UTF-8 encoding by default, the usage of encodedOffset is considered as deprecated and Range cannot be converted to NSRange without an instance of String itself, because in order to calculate the offset we need the source string which is encoded in UTF-8 and it should be converted to UTF-16 before calculating offset. So best approach, for now, is to use generic init.
Swift 5 Solution
Converting Range into NSRange
As the 'encodedOffset' is deprecated, so now in order to convert String.Index to Int we need the reference of original string from which Range<String.Index> was derived.
A convenient detailed extension for NSRange could be as below:
extension NSRange {
public init(range: Range<String.Index>,
originalText: String) {
let range_LowerBound_INDEX = range.lowerBound
let range_UpperBound_INDEX = range.upperBound
let range_LowerBound_INT = range_LowerBound_INDEX.utf16Offset(in: originalText)
let range_UpperBound_INT = range_UpperBound_INDEX.utf16Offset(in: originalText)
let locationTemp = range_LowerBound_INT
let lengthTemp = range_UpperBound_INT - range_LowerBound_INT
self.init(location: locationTemp,
length: lengthTemp)
}
}
While the shorthand extension is as below
extension NSRange {
public init(range: Range<String.Index>,
originalText: String) {
self.init(location: range.lowerBound.utf16Offset(in: originalText),
length: range.upperBound.utf16Offset(in: originalText) - range.lowerBound.utf16Offset(in: originalText))
}
}
Now we can use any Range to convert it into NSRange as below, sharing my own requirement which led me to write above extensions
I was using below String extension for finding all the ranges of specific word from the String
extension String {
func ranges(of substring: String, options: CompareOptions = [], locale: Locale? = nil) -> [Range<Index>] {
var ranges: [Range<Index>] = []
while let range = range(of: substring, options: options, range: (ranges.last?.upperBound ?? self.startIndex)..<self.endIndex, locale: locale) {
ranges.append(range)
}
return ranges
}
}
My requirement was to change the colour of specific words in a String, so for that I wrote this extension which does the job
extension NSAttributedString {
static func colored(originalText:String,
wordToColor:String,
currentColor:UIColor,
differentColor:UIColor) -> NSAttributedString {
let attr = NSMutableAttributedString(string: originalText)
attr.beginEditing()
attr.addAttribute(NSAttributedString.Key.foregroundColor,
value: currentColor,
range: NSRange(location: 0, length: originalText.count))
// FOR COVERING ALL THE OCCURENCES
for eachRange in originalText.ranges(of: wordToColor) {
attr.addAttribute(NSAttributedString.Key.foregroundColor,
value: differentColor,
range: NSRange(range: eachRange, originalText: originalText))
}
attr.endEditing()
return attr
}
}
Finally I was using it from my main code as below
let text = "Collected".localized() + " + " + "Cancelled".localized() + " + " + "Pending".localized()
myLabel.attributedText = NSAttributedString.colored(originalText: text,
wordToColor: "+",
currentColor: UIColor.purple,
differentColor: UIColor.blue)
And the result is as below, having the colour of + sign changed as blue from the main text colour which is purple.
Hope this helps someone in need. Thanks!
Swift 4
I think, there are two ways.
1. NSRange(range, in: )
2. NSRange(location:, length: )
Sample code:
let attributedString = NSMutableAttributedString(string: "Sample Text 12345", attributes: [.font : UIFont.systemFont(ofSize: 15.0)])
// NSRange(range, in: )
if let range = attributedString.string.range(of: "Sample") {
attributedString.addAttribute(.foregroundColor, value: UIColor.orange, range: NSRange(range, in: attributedString.string))
}
// NSRange(location: , length: )
if let range = attributedString.string.range(of: "12345") {
attributedString.addAttribute(.foregroundColor, value: UIColor.green, range: NSRange(location: range.lowerBound.encodedOffset, length: range.upperBound.encodedOffset - range.lowerBound.encodedOffset))
}
Screen Shot:
Swift 3 Extension Variant that preserves existing attributes.
extension UILabel {
func setLineHeight(lineHeight: CGFloat) {
guard self.text != nil && self.attributedText != nil else { return }
var attributedString = NSMutableAttributedString()
if let attributedText = self.attributedText {
attributedString = NSMutableAttributedString(attributedString: attributedText)
} else if let text = self.text {
attributedString = NSMutableAttributedString(string: text)
}
let style = NSMutableParagraphStyle()
style.lineSpacing = lineHeight
style.alignment = self.textAlignment
let str = NSString(string: attributedString.string)
attributedString.addAttribute(NSParagraphStyleAttributeName,
value: style,
range: str.range(of: str as String))
self.attributedText = attributedString
}
}
func formatAttributedStringWithHighlights(text: String, highlightedSubString: String?, formattingAttributes: [String: AnyObject]) -> NSAttributedString {
let mutableString = NSMutableAttributedString(string: text)
let text = text as NSString // convert to NSString be we need NSRange
if let highlightedSubString = highlightedSubString {
let highlightedSubStringRange = text.rangeOfString(highlightedSubString) // find first occurence
if highlightedSubStringRange.length > 0 { // check for not found
mutableString.setAttributes(formattingAttributes, range: highlightedSubStringRange)
}
}
return mutableString
}
I love the Swift language, but using NSAttributedString with a Swift Range that is not compatible with NSRange has made my head hurt for too long. So to get around all that garbage I devised the following methods to return an NSMutableAttributedString with the highlighted words set with your color.
This does not work for emojis. Modify if you must.
extension String {
func getRanges(of string: String) -> [NSRange] {
var ranges:[NSRange] = []
if contains(string) {
let words = self.components(separatedBy: " ")
var position:Int = 0
for word in words {
if word.lowercased() == string.lowercased() {
let startIndex = position
let endIndex = word.characters.count
let range = NSMakeRange(startIndex, endIndex)
ranges.append(range)
}
position += (word.characters.count + 1) // +1 for space
}
}
return ranges
}
func highlight(_ words: [String], this color: UIColor) -> NSMutableAttributedString {
let attributedString = NSMutableAttributedString(string: self)
for word in words {
let ranges = getRanges(of: word)
for range in ranges {
attributedString.addAttributes([NSForegroundColorAttributeName: color], range: range)
}
}
return attributedString
}
}
Usage:
// The strings you're interested in
let string = "The dog ran after the cat"
let words = ["the", "ran"]
// Highlight words and get back attributed string
let attributedString = string.highlight(words, this: .yellow)
// Set attributed string
label.attributedText = attributedString
My solution is a string extension that first gets the swift range then get's the distance from the start of the string to the start and end of the substring.
These values are then used to calculate the start and length of the substring. We can then apply these values to the NSMakeRange constructor.
This solution works with substrings that consist of multiple words, which a lot of the solutions here using enumerateSubstrings let me down on.
extension String {
func NSRange(of substring: String) -> NSRange? {
// Get the swift range
guard let range = range(of: substring) else { return nil }
// Get the distance to the start of the substring
let start = distance(from: startIndex, to: range.lowerBound) as Int
//Get the distance to the end of the substring
let end = distance(from: startIndex, to: range.upperBound) as Int
//length = endOfSubstring - startOfSubstring
//start = startOfSubstring
return NSMakeRange(start, end - start)
}
}
let text:String = "Hello Friend"
let searchRange:NSRange = NSRange(location:0,length: text.characters.count)
let range:Range`<Int`> = Range`<Int`>.init(start: searchRange.location, end: searchRange.length)