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# UITextChecker

An object to check a string (usually the text of a document) for misspelled words.

```
@MainActor class UITextChecker
```

## Overview

[`UITextChecker`](/documentation/UIKit/UITextChecker) spell-checks using a lexicon for a specific language. You can tell it to ignore specific words when spell-checking a particular document and you can have it learn words, which adds those words to the lexicon. You generally use one instance of [`UITextChecker`](/documentation/UIKit/UITextChecker) per document, although you can use a single instance to spell-check related pieces of text if you want to share ignored words and other state.

You may also use a text checker to obtain completions for partially entered words, as well as possible replacements for misspelled words, which you then can present to users.

## Topics

### Initiating a Spell Check

[`rangeOfMisspelledWord(in:range:startingAt:wrap:language:)`](/documentation/UIKit/UITextChecker/rangeOfMisspelledWord(in:range:startingAt:wrap:language:))

Initiates a search of a range of a string for a misspelled word.

### Obtaining Word Guesses and Completions

[`guesses(forWordRange:in:language:)`](/documentation/UIKit/UITextChecker/guesses(forWordRange:in:language:))

Returns a list of words that are possible valid replacements for a misspelled word.

[`completions(forPartialWordRange:in:language:)`](/documentation/UIKit/UITextChecker/completions(forPartialWordRange:in:language:))

Returns an array of strings that are possible completions for a partially entered word.

### Learning and Ignoring Words

[`ignoreWord(_:)`](/documentation/UIKit/UITextChecker/ignoreWord(_:))

Tells the text checker to ignore the specified word when spell-checking.

[`ignoredWords`](/documentation/UIKit/UITextChecker/ignoredWords)

Returns the words that the text checker ignores when spell-checking.

[`learnWord(_:)`](/documentation/UIKit/UITextChecker/learnWord(_:))

Tells the text checker to learn the specified word so that it doesn’t evaluate it as misspelled.

[`unlearnWord(_:)`](/documentation/UIKit/UITextChecker/unlearnWord(_:))

Tells the text checker to unlearn the specified word.

[`hasLearnedWord(_:)`](/documentation/UIKit/UITextChecker/hasLearnedWord(_:))

Returns whether the text checker has learned the specified word.

### Getting the Available Languages

[`availableLanguages`](/documentation/UIKit/UITextChecker/availableLanguages)

Returns the languages that the text checker’s class can perform spell-checking for.


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