Find Number of Spaces in a String in Swift

Find number of spaces in a string in Swift

Swift 5 or later

In Swift 5 we can use the new Character properties isWhitespace and isNewline

let str = "Hello, playground. Hello, playground !!!"
let spaceCount = str.reduce(0) { $1.isWhitespace && !$1.isNewline ? $0 + 1 : $0 }
print(spaceCount) // 4

---

If your intent is to count " " only

let spaceCount = str.reduce(0) { $1 == " " ? $0 + 1 : $0 }

Swift - Whitespace count in a string

If you want to consider other whitespace characters (not only space) use regular expression:

let string = "How to get count of the empty space in text,Like how we get character count like wise i need empty space count in a text, It would be more helpful if explained with an example."

let regex = try! NSRegularExpression(pattern: "\\s")
let numberOfWhitespaceCharacters = regex.numberOfMatches(in: string, range: NSRange(location: 0, length: string.utf16.count))

Regular expression \\s considers tab, cr, lf and space

How to count number of leading spaces in a string in Swift?

One way is to use prefix(while:), and count how many characters you got:

yourString.prefix(while: { $0 == " " }).count

How can i find character number except space between words

    let str = "Hello I m iOS developer"
    let filter = str.filter {!$0.isWhitespace}
    print(filter.count)

Swift - How do I count the occurrences of a specific character in a String?

To count the occurrences of a specific character all you have to do is use the filter() method like so:

var myName = "Jane Doe"
let numOccurrences = myName.filter{ $0 == "e" }.count
print(numOccurrences) // prints out 2

.filter will iterate over every character in the string, denoted by $0, and then return a list of all characters that are equal to the character "e". All you have to do after that is use .count to get the number of total occurrences.

Check if string has a space

let url = "http://www.example.com/images/pretty pic.png"
let whiteSpace = " "
if let hasWhiteSpace = url.rangeOfString(whiteSpace) {
            print ("has whitespace")
      } else {
            print("no whitespace")
}

How can I check to see if a string contains characters of whitespace/alphanumeric/etc?

Use NSCharacter on the entire string,not character-by-character:

let whitespace = NSCharacterSet.whitespaceCharacterSet()

let phrase = "Test case"
let range = phrase.rangeOfCharacterFromSet(whitespace)

// range will be nil if no whitespace is found
if let test = range {
    println("whitespace found")
}
else {
    println("whitespace not found")
}

Output:

whitespace found

How to remove all the spaces and \n\r in a String?

Swift 4:

let text = "This \n is a st\tri\rng"
let test = String(text.filter { !" \n\t\r".contains($0) })

Output:

print(test) // Thisisastring

While Fahri's answer is nice, I prefer it to be pure Swift ;)

String to Double and leading whitespace

This is fully documented. Look at the documentation for the init method that takes a StringProtocol.

Near the end of all of the examples, it states:

Passing any other format or any additional characters as text results in nil. For example, the following conversions result in nil:

Double(" 5.0")      // Includes whitespace

So your solution to trim whitespace before conversion is the correct one.

---

Related Topics