removing white spaces at beginning and end of string - ios

Question

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.

Answer 1

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)

Answer 2

String trimming first and last whitespaces and newlines in Swift 4+
" 2 space ".trimmingCharacters(in: .whitespacesAndNewlines)
result:
"2 space"

Answer 3

//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)
}

Answer 4

You can use this extension and just call "yourString".trim()
extension String
{
func trim() -> String
{
return self.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceAndNewlineCharacterSet())
}
}

Answer 5

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 ""
}
`

Answer 6

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
}

Answer 7

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
}
}

Answer 8

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()

Answer 9

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
}
}

Answer 10

let string = " exam ple "
let trimmed = string.replacingOccurrences(of: "(^\s+)|(\s+)$", with: "", options: .regularExpression)
print(">" + trimmed3 + "<")
// prints >exam ple<