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let notepad = Notepad(frame: view.bounds, themeFile: "one-dark")
view.addSubview(notepad)

Notepad is just like any other UITextView, but you need to use the convenience initializer in order to use the themes. To create a new theme, copy one of the existing themes and edit the JSON.

Check out the Xcode project for an example. For full documentation read the code.

Take a look at all of the themes and swatches when choosing the theme for your Notepad, or as inspiration for a new one.

You can find all of the raw themes in the themes folder, and the file names are case-sensitive.

Using regex, you can match custom patterns in your Notepad editor by passing a regex attribute in your theme. For example, one that highlights Twitter handles in a teal color:

"handle": {
  "regex": "[@＠][a-zA-Z0-9_]{1,20}",
  "color": "#78ddd5"
}

Copy the source from the Notepad folder to your project, or add Notepad to your Podfile if you're using CocoaPods.