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UITextViewに入力されている文字数をカウントする

Last updated at Posted at 2022-01-31

TextViewに入力されている文字数のリアルタイムカウントを実装します。
文字列中の全ての空白や改行はカウントしません。

環境

  • Xcode 13.2.1
  • Swift 5.5.2

手順

StringProtocolを拡張します。

Extension.swift
extension StringProtocol where Self: RangeReplaceableCollection {
  var removeWhitespacesAndNewlines: Self {
    filter { !$0.isNewline && !$0.isWhitespace}
  }
}

使用例

ViewController.swift
extension ViewController: UITextViewDelegate {
  func textViewDidChange(_ textView: UITextView) {
    let textLength = textView.text.removeWhitespacesAndNewlines.count
    navigationTitle.text = "total: \(textLength)"
  }
}

終わりに

 
終わりです。

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