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I have heard that Apple's spell checker for UITextView maintains some kind of logging of what you type in individual applications. I have a secure application where spell checking is a useful feature, however I don't want new words logged to somewhere outside of my application. Can anyone refer me to an Apple reference document or technical description of what information is captured by spell check, and where it is captured too?
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Auto-Correction uses your keyboard dictionary to spellcheck words as you type, automatically correcting misspelled words for you. To use it, just type in a text field. To make sure that this setting is turned on, use these steps: Open the Settings app.
Spell check identifies and corrects misspelled words. It also allows you to search a document yourself for words you know you've misspelled. In Microsoft Word, spell check options, like spelling and grammar may be found under the 'review' tab and 'proofing' window.
Not all misspellings and grammar mistakes that Word identifies will be actual mistakes. For example, names will often be marked as misspelled words, even when they're properly spelled. You can ignore these errors so that they'll no longer be underlined and won't appear in spelling and grammar checks.
Spell checkers can use approximate string matching algorithms such as Levenshtein distance to find correct spellings of misspelled words. An alternative type of spell checker uses solely statistical information, such as n-grams, to recognize errors instead of correctly-spelled words.
Not sure if this helps much, but you could do spell checking manually with the UITextChecker class which allows setting a list of ignored words:
- (void)setIgnoredWords:(NSArray *)words
More here: https://developer.apple.com/library/ios/#documentation/UIKit/Reference/UITextChecker_Class/Reference/Reference.html
You can also check whether the word has been learned with:
+ (BOOL)hasLearnedWord:(NSString *)word
I don't know definitively, but using fseventer, learning the word "aple" in TextEdit saves that word to ~/Library/Spelling/LocalDictionary. Ignoring a word seems not to modify the filesystem at all, and indeed, if the document is closed and not saved, and a new document with that previously-ignored word is opened, it is no longer ignored. This is consistent with +learnWord: being a class method, and -ignoreWord: being an instance method. So for security, you could probably just never call +learnWord:, and instead have your own backend to persistently/securely store a list of ignored words.
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