Swift NSAttributedString Trim
Create extension of NSAttributedString as below.
extension NSAttributedString {
public func attributedStringByTrimmingCharacterSet(charSet: CharacterSet) -> NSAttributedString {
let modifiedString = NSMutableAttributedString(attributedString: self)
modifiedString.trimCharactersInSet(charSet: charSet)
return NSAttributedString(attributedString: modifiedString)
}
}
extension NSMutableAttributedString {
public func trimCharactersInSet(charSet: CharacterSet) {
var range = (string as NSString).rangeOfCharacter(from: charSet as CharacterSet)
// Trim leading characters from character set.
while range.length != 0 && range.location == 0 {
replaceCharacters(in: range, with: "")
range = (string as NSString).rangeOfCharacter(from: charSet)
}
// Trim trailing characters from character set.
range = (string as NSString).rangeOfCharacter(from: charSet, options: .backwards)
while range.length != 0 && NSMaxRange(range) == length {
replaceCharacters(in: range, with: "")
range = (string as NSString).rangeOfCharacter(from: charSet, options: .backwards)
}
}
}
and use in viewController where you want to use. like this
let attstring = NSAttributedString(string: "this is test message. Please wait. ")
let result = attstring.attributedStringByTrimmingCharacterSet(NSCharacterSet.whitespaceAndNewlineCharacterSet())
This works even with emoji in the text
extension NSAttributedString {
/** Will Trim space and new line from start and end of the text */
public func trimWhiteSpace() -> NSAttributedString {
let invertedSet = CharacterSet.whitespacesAndNewlines.inverted
let startRange = string.utf16.description.rangeOfCharacter(from: invertedSet)
let endRange = string.utf16.description.rangeOfCharacter(from: invertedSet, options: .backwards)
guard let startLocation = startRange?.upperBound, let endLocation = endRange?.lowerBound else {
return NSAttributedString(string: string)
}
let location = string.utf16.distance(from: string.startIndex, to: startLocation) - 1
let length = string.utf16.distance(from: startLocation, to: endLocation) + 2
let range = NSRange(location: location, length: length)
return attributedSubstring(from: range)
}
}
USAGE
let attributeString = NSAttributedString(string: "\n\n\n Hi ð ð©ð©ð§ð©ð©ð¦ð¦ð©ð©ð§ð§ð¨ð¨ð¦ð©ð¦ð¨ð¨ð§ð§ð¨ð¨ð¦ð¦ð¨ð¨ð§ð¦ð©ð§ð¦ð©ð¦ð¦ð©ð§ð§ð¨ð¦ buddy. ")
let result = attributeString.trimWhiteSpace().string // Hi ð ð©ð©ð§ð©ð©ð¦ð¦ð©ð©ð§ð§ð¨ð¨ð¦ð©ð¦ð¨ð¨ð§ð§ð¨ð¨ð¦ð¦ð¨ð¨ð§ð¦ð©ð§ð¦ð©ð¦ð¦ð©ð§ð§ð¨ð¦ buddy.