How to capitalize the first character of sentence using Swift - swift

Question

I have a String description that holds my sentence and want to capitalize only the first letter. I tried different things but most of them give me exceptions and errors. I'm using Xcode 6.
Here is what I tried so far:
let cap = [description.substringToIndex(advance(0,1))] as String
description = cap.uppercaseString + description.substringFromIndex(1)
It gives me:
Type 'String.Index' does not conform to protocol 'IntegerLiteralConvertible'
I tried:
func capitalizedStringWithLocale(locale:0) -> String
But I haven't figured out how to make it work.

Answer 1

In Swift 2, you can do
String(text.characters.first!).capitalizedString + String(text.characters.dropFirst())

Answer 2

Another possibility in Swift 3:
extension String {
func capitalizeFirst() -> String {
let firstIndex = self.index(startIndex, offsetBy: 1)
return self.substring(to: firstIndex).capitalized + self.substring(from: firstIndex).lowercased()
}
}
For Swift 4:
Warnings from above Swift 3 code:
'substring(to:)' is deprecated: Please use String slicing subscript
with a 'partial range upto' operator.
'substring(from:)' is deprecated: Please use String slicing subscript with a 'partial range from' operator.
Swift 4 solution:
extension String {
var capitalizedFirst: String {
guard !isEmpty else {
return self
}
let capitalizedFirstLetter = charAt(i: 0).uppercased()
let secondIndex = index(after: startIndex)
let remainingString = self[secondIndex..<endIndex]
let capitalizedString = "\(capitalizedFirstLetter)\(remainingString)"
return capitalizedString
}
}

Answer 3

Swift 5.0
Answer 1:
extension String {
func capitalizingFirstLetter() -> String {
return prefix(1).capitalized + dropFirst()
}
mutating func capitalizeFirstLetter() {
self = self.capitalizingFirstLetter()
}
}
Answer 2:
extension String {
func capitalizeFirstLetter() -> String {
return self.prefix(1).capitalized + dropFirst()
}
}
Answer 3:
extension String {
var capitalizeFirstLetter:String {
return self.prefix(1).capitalized + dropFirst()
}
}

Answer 4

import Foundation
// A lowercase string
let description = "the quick brown fox jumps over the lazy dog."
// The start index is the first letter
let first = description.startIndex
// The rest of the string goes from the position after the first letter
// to the end.
let rest = advance(first,1)..<description.endIndex
// Glue these two ranges together, with the first uppercased, and you'll
// get the result you want. Note that I'm using description[first...first]
// to get the first letter because I want a String, not a Character, which
// is what you'd get with description[first].
let capitalised = description[first...first].uppercaseString + description[rest]
// Result: "The quick brown fox jumps over the lazy dog."
You may want to make sure there's at least one character in your sentence before you start, as otherwise you'll get a runtime error trying to advance the index beyond the end of the string.

Answer 5

Here is how to do it in Swift 4; just in case if it helps anybody:
extension String {
func captalizeFirstCharacter() -> String {
var result = self
let substr1 = String(self[startIndex]).uppercased()
result.replaceSubrange(...startIndex, with: substr1)
return result
}
}
It won't mutate the original String.

Answer 6

extension String {
var capitalizedFirstLetter:String {
let string = self
return string.replacingCharacters(in: startIndex...startIndex, with: String(self[startIndex]).capitalized)
}
}
Answer:
let newSentence = sentence.capitalizedFirstLetter

Answer 7

For one or each word in string, you can use String's .capitalized property.
print("foo".capitalized) //prints: Foo
print("foo foo foo".capitalized) //prints: Foo Foo Foo

Answer 8

Swift 4.2 version:
extension String {
var firstCharCapitalized: String {
switch count {
case 0:
return self
case 1:
return uppercased()
default:
return self[startIndex].uppercased() + self[index(after: startIndex)...]
}
}
}

Answer 9

Simplest soulution for Swift 4.0.
Add as a computed property extension:
extension String {
var firstCapitalized: String {
var components = self.components(separatedBy: " ")
guard let first = components.first else {
return self
}
components[0] = first.capitalized
return components.joined(separator: " ")
}
}
Usage:
"hello world".firstCapitalized