I've got a problem with removing whitespaces at the beginning and end of string. For e.g. I've got a string like:
\r\n\t- Someone will come here?\n- I don't know for sure...\r\n\r\n
And I need to remove whitespaces only at the end and beginning (string should be look like: - Someone will come here?\n- I don't know for sure... Also there could be a lot of variants of string end: "\r\n\r\n", "\r\n", "\n\r\n" and so on...
Thanks.
Your string contains not only whitespace but also new line characters.
Use stringByTrimmingCharactersInSet with whitespaceAndNewlineCharacterSet.
let string = "\r\n\t- Someone will come here?\n- I don't know for sure...\r\n\r\n" let trimmedString = string.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceAndNewlineCharacterSet()) In Swift 3 it's more cleaned up:
let trimmedString = string.trimmingCharacters(in: .whitespacesAndNewlines) 
String trimming first and last whitespaces and newlines in Swift 4+
" 2 space ".trimmingCharacters(in: .whitespacesAndNewlines) result: "2 space"
//here i have used regular expression and replaced white spaces at the start and end let stringPassing : NSString? = "hdfjkhsdj hfjksdhf sdf " do { print("old->\(stringPassing)") let pattern : String = "(^\\s+)|(\\s+)$" let regex = try NSRegularExpression(pattern: pattern , options: []) let newMatched = regex.matchesInString(stringPassing! as String, options: [], range: NSMakeRange(0,stringPassing!.length)) if(newMatched.count > 0){ let modifiedString = regex.stringByReplacingMatchesInString(stringPassing! as String, options: [] , range: NSMakeRange(0,stringPassing!.length), withTemplate: "") print("new->\(modifiedString)") } } catch let error as NSError { print(error.localizedDescription) } You can use this extension and just call "yourString".trim()
extension String { func trim() -> String { return self.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceAndNewlineCharacterSet()) } } If you want to remove Whitespace from the start of the string Try this Code.
func removeSpace()->String{ let txt = myString var count:Int! = 0 for i in txt{ if i == " "{ count += 1 }else{ if count != 0{ return String(txt.dropFirst(count)) }else{ return txt } } } return "" } `
Remove all whiteSpaces from the start of string
func removeWhiteSpaces(str:String) -> String{ var newStr = str for i in 0..<str.count{ let index = str.index(str.startIndex, offsetBy: i) print(str[index]) if str[index] != " "{ return newStr } else{ newStr.remove(at: newStr.startIndex) } } return newStr } In this code to restrict Textfield beginning white space
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool { if (textField.text?.count)! == 0 && string == " " { return false } else{ return true } } In Swift 4 Use it on any String type variable.
extension String { func trimWhiteSpaces() -> String { let whiteSpaceSet = NSCharacterSet.whitespaces return self.trimmingCharacters(in: whiteSpaceSet) } } And Call it like this
yourString.trimWhiteSpaces() You could first remove from the beginning and then from the end like so:
while true { if sentence.characters.first == "\r\n" || sentence.characters.first == "\n" { sentence.removeAtIndex(sentence.startIndex) } else { break } } while true { if sentence.characters.last == "\r\n" || sentence.characters.last == "\n" { sentence.removeAtIndex(sentence.endIndex.predecessor()) } else { break } } let string = " exam ple "
let trimmed = string.replacingOccurrences(of: "(^\s+)|(\s+)$", with: "", options: .regularExpression)
print(">" + trimmed3 + "<")
// prints >exam ple<
