NSTextView momentarily disable automatic spelling correction - objective-c

Question

Question
In some applications, such as mail clients or Twitter clients, I find myself typing away at something, everything looks good and right when I press the send/Tweet button the text view automatically corrects the last word to an incorrect spelling. Obviously at that point I waited just the wrong amount of time after finishing typing before sending it so the spell checking was still going on.
I guess the first question here really should be what do you think about removing that functionality? Because on the other hand I'm sure that exact same thing happens to people but it actually fixes the spelling of the last word as opposed to messing it up. Otherwise if you think this is a valid idea is there a way to disable automatic spelling correction when a NSTextView loses focus?
What I've looked at:
This question on how to deal with spelling stuff in NSTextViews
This question on turning off spell checking all together.
The NSTextInput Protocol
The NSIgnoreMisspelledWords Protocol
The NSChangeSpelling Protocol
NSSpellChecker specifically it's Auto Spelling Correction methods (I really thought this would get me somewhere) I finished wondering why a NSSpellCheckerDelegate doesn't exist
This question about NSSpellChecker's misleading (read the comments) NSNotifications
NSTextCheckingTypes (at the bottom) specifically NSTextCheckingTypeCorrection
This question about doing spell checking in general
NSTextView specifically the 'Working With the Spelling Checker' and 'Text Checking and Substitutions' methods
This question just about turning the functionality on and off
The Spell Checking Programming Topics which really only talks about non-automatic spell checking
NSTextViewDelegate specifically the 'Working With the Spelling Checker' methods
What I actually tried (in Xcode in an empty project)
Implementing the NSTextDelegate textShouldBeginEditing: and textShouldEndEditing: and inside of calling [self.textView setAutomaticSpellingCorrectionEnabled:true]; and [self.textView setAutomaticSpellingCorrectionEnabled:false]; respectively (at first I also called NSTextView's setAutomaticTextReplacementEnabled: but that's just for user settings like (c) to the copyright symbol)
In the same textShouldBeginEditing: and textShouldEndEditing: (from above) setting the NSTextView's enabledTextCheckingTypes to NSTextCheckingAllTypes and NSTextCheckingAllTypes - NSTextCheckingTypeCorrection respectively.
Subclassing NSTextView and implementing becomeFirstResponder and resignFirstResponder and in them changing the same properties as above.
Calling NSSpellChecker methods from either resignFirstResponder or textShouldEndEditing: (this works with [[NSSpellChecker sharedSpellChecker] dismissCorrectionIndicatorForView:self];) to hide the popup but it still corrects the spelling)
Example
I've noticed this functionality in Tweetbot you can test it using foriegn vs foreign. If you type it in and Tweet it while the bubble is still up it will Tweet the incorrect spelling.

Answer 1

The solution is to subclass NSTextView and override the handleTextCheckingResults: method.
- (void)handleTextCheckingResults:(NSArray<NSTextCheckingResult *> *)results forRange:(NSRange)range types:(NSTextCheckingTypes)checkingTypes options:(NSDictionary<NSTextCheckingOptionKey,id> *)options orthography:(NSOrthography *)orthography wordCount:(NSInteger)wordCount {
for (NSTextCheckingResult *result in results) {
if (result.resultType == NSTextCheckingTypeSpelling) {
// you can either suppress all corrections by using `return` here
// or you can compare the original string to the replacement like this:
NSString *originalString = [self.string substringWithRange:result.range];
NSString *replacement = result.replacementString;
// or you can do something more complex (like suppressing correction only under
// certain conditions
return; // we don't do the correction
}
}
// default behaviors, including auto-correct
[super handleTextCheckingResults:results forRange:range types:checkingTypes options:options orthography:orthography wordCount:wordCount];
}
This works for all of the NSTextCheckingTypes.