The document discusses the UITextChecker class in iOS, which allows checking text for mistakes while typing and provides functionality like spell checking, getting word guesses and completions, and learning, unlearning, or ignoring words. It describes how to initialize a spell check, get guesses for misspelled words, get word completions, and manage the dictionary by learning, unlearning, or ignoring words. The technical introduction section provides an overview of the class's inheritance, protocol conformance, and available features and methods.

1. UITextChecker
Check text
Make silly mistakes
while TYPING…

2. Introduction
• We all are human being & generally make
mistakes while making decisions, learning,
typing etc…
TYPING MISTAKE
• So from iOS 3.2, if you made any kind of
typing mistake, you can easily check it by using
class
UITextChecker

3. Usage
• Now you must be thinking out, Apple already
provides us the same in UITextField and
UITextView , so where should we use them???
• You can use them while editing any
documents, by ignoring few words or
learning/unlearning new words.
• You can even learn email’ids and
first/middle/last name… so from next time
user can type fast.

4. Technical Introduction
• Inherit from only NSObject
NSObject -> UITextChecker
• Confirm to single protocol only NSObject
• Features-
– Get all available languages for text checking.
– Initializing spelling checking.
– Getting word guesses & completions.
– Learn/Unlearn/Ignore words.

5. Available Languages
+ (NSArray *)availableLanguages
OR
class func availableLanguages() -> [AnyObject]
Will return the languages where string checker class
can perfom spell-checking.

6. Initializing a Spell Check
- (NSRange)rangeOfMisspelledWordInString:(NSString
*)stringToCheck range:(NSRange)range
startingAt:(NSInteger)startingOffset wrap:(BOOL)
wrapFlag language:(NSString *)language
- We can begin search in a string for a misspelled word, for a specific
range or by not wrapping(i.e Full String) in a particular language. It
would provide us first wrong/misspelled word found.

7. Guess Correct Word
- (NSArray
*)guessesForWordRange:(NSRange)range inStri
ng:(NSString *)string language:(NSString
*)language
- Use this method to get an array of strings which
might be correct replacement for “spell checking
string” using specific language in given range of
string.

8. Word Completions
- (NSArray
*)completionsForPartialWordRange:(NSRange)range
inString:(NSString
*)string language:(NSString *)language
It will return an array of possible words, which is
combination of entered characters(Partial word). If
nothing found it will return an empty array.

9. Learn/Unlearn/Ignore
We can easily add a new word in our dictionary,
we can also remove a wrong word entered into
dictionary by mistakenly. Also, We can ignore
few words which are not relevant…
• + (void)learnWord:(NSString *)word
• + (void)unlearnWord:(NSString *)word

10. Learn/Unlearn/Ignore
We can easily ignore a single word or multiple
words using below methods:-
• - (void)ignoreWord:(NSString *)wordToIgnore
• - (void)setIgnoredWords:(NSArray *)words
• + (BOOL)hasLearnedWord:(NSString *)word
• - (NSArray *)ignoredWords

11. Cool References
• http://nshipster.com/uitextchecker/
• https://developer.apple.com/library/ios/docu
mentation/UIKit/Reference/UITextChecker_Cl
ass/