blocks|key|226994|text|每个自定义键盘(独立于其RequestsOpenAccess键的值)都可以通过UILexicon类访问一个基本的自动更正词典。使用这个类，连同你自己设计的词典，在用户输入文本时提供建议和自动更正。UILexicon对象包含各种来源的单词，包括：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|226995|用户通讯簿数据库文本快捷键中未配对的名字和姓氏--设置>一般>键盘>快捷键列表--一个包含苹果产品名称的常用词汇词典|226996|entityMap^0|13|9|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|N|8|@]|D|@]|E|$]]]|I|$]]

Every custom keyboard (independent of the value of its RequestsOpenAccess key) has access to a basic autocorrection lexicon through the <code>UILexicon</code> class. Make use of this class, along with a lexicon of your own design, to provide suggestions and autocorrections as users are entering text. The UILexicon object contains words from various sources, including:

Unpaired first names and last names from the user’s Address Book database
Text shortcuts defined in the Settings > General > Keyboard > Shortcuts list
A common words dictionary that includes the names of Apple products

blocks|key|784284|text|虽然我个人还没有尝试创建一个自定义键盘，但我的回答是基于我在文档中看到的内容。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|784285|在键盘中，创建一个名为entries的属性，类型为[AnyObject]+(AnyObjects数组)。|offset|length|style|CODE|784286|在init方法中，或在创建键盘的地方，调用此方法：|784287|requestSupplementaryLexiconWithCompletion(completionHandler:+{
++++lexicon+in+
++++self.entries+=+lexicon.entries
})|code-block|syntax|javascript|784288|我怀疑entries实际上是一个String或NSStrings数组，但它可能是一个字典或其他类型。在测试这一点时，试着在找出您的逻辑之前，先找出entries中包含的类型。|784289|我认为目前没有办法获得苹果默认的自动更正选项。然而，这个WWDC谈话提供了关于他们是如何在原始的iPhone操作系统中进行自动更正的(大约30分钟)。|784290|他提到使用数组的二进制搜索，这使我相信这个数组是排序的。当然，自从第一次iPhone问世后可能会有很大的变化.|784291|祝你好运，找到这个新的API！|784292|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.apple.com/videos/wwdc/2014/^0|0|B|7|P|B|0|1|4|0|0|3|7|21|7|0|S|6|0|0|0|0^^$0|@$1|2|3|4|5|6|7|14|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|15|8|@$D|16|E|17|F|G]|$D|18|E|19|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|1A|8|@$D|1B|E|1C|F|G]]|9|@]|A|$]]|$1|J|3|K|5|L|7|1D|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|1E|8|@$D|1F|E|1G|F|G]|$D|1H|E|1I|F|G]]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1J|8|@]|9|@$D|1K|E|1L|1|1M]]|A|$]]|$1|S|3|T|5|6|7|1N|8|@]|9|@]|A|$]]|$1|U|3|V|5|6|7|1O|8|@]|9|@]|A|$]]|$1|W|3|-4|5|6|7|1P|8|@]|9|@]|A|$]]]|X|$Y|$5|Z|10|11|A|$12|13]]]]

Although I have not personally tried creating a custom keyboard, I am basing this answer on what I can see in the documentation.

In your keyboard, create a property called <code>entries</code> of type <code>[AnyObject]</code> (Array of AnyObjects).

In your <code>init</code> method, or wherever you create the keyboard, call this method:

<pre><code>requestSupplementaryLexiconWithCompletion(completionHandler: {
 lexicon in 
 self.entries = lexicon.entries
})
</code></pre>

I suspect that <code>entries</code> is actually an array of Strings or NSStrings, but it could be a dictionary or some other type. When testing this out, try figuring out what type is actually contained in <code>entries</code> before figuring out your logic.

I do not believe there is a way to get Apple's default autocorrect options currently. However, this <a href="https://developer.apple.com/videos/wwdc/2014/" rel="nofollow">WWDC talk</a> gives insight about how they made autocorrect work in the original iPhone OS (around the 30 minute mark).

He mentions using a binary search of the array, which leads me to believe that this array is sorted. Of course, much could have changed since the first iPhone came out...

Good luck figuring out this new API!

blocks|key|227036|text|实现词汇表的方式大致如下所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|227037|使用requestSupplementaryLexiconWithCompletion()在启动时获得词典一次。|ordered-list-item|offset|length|style|CODE|227038|输入每个类型的文本，将其添加到NSString+(跟踪当前单词)|227039|当用户按空格(现代词的结尾)时，检查字符串与词典。|227040|如果是匹配，则计算字符数并删除该数目的字符|227041|输入词典所建议的建议|227042|清除字符串并重新启动|227043|此外，您还可以使用UITextChecker提供更高级的自动更正功能。|227044|代码(在Objective中，这可能不是我在总线上写的100%25的准确性，但它应该这样做)：|227045|UILexicon+*lexicon;
NSString+*currentString;

-(void)viewDidLoad+{
+++++[self+requestSupplementaryLexiconWithCompletion:%5E(UILexicon+*receivedLexicon)+{
+++++++++self.lexicon+=+receivedLexicon;
+++++}];
}

-(IBAction)myTypingAction:(UIButton+*)sender+{
++++[documentProxy+insertText:sender.title];+
++++[currentString+stringByAppendingString:sender.title];
}

-(IBAction)space+{
+++[documentProxy+insertText:@"+"];
+++for+(UILexiconEntry+*lexiconEntry+in+lexicon.entries)+{
+++++++if+(lexiconEntry.userInput+isEqualToString:currentString)+{
++++++++++++for+(int+i+=+0;+currentString.length+>=i+;+i%2B%2B)+{+
+++++++++++++++++[documentProxy+deleteTextBackwards];
++++++++++++}
++++++++++++[documentProxy+insertText:lexiconEntry.documentText];
++++++++++++currentString+=+@"";++
++++++++}
++++}+
}|code-block|syntax|javascript|227046|如果你还有任何问题，请随时发表评论。|227047|资料来源:使用8键盘和UILexicon的个人经验。|BOLD|227048|entityMap^0|0|2|17|0|F|8|0|0|0|0|0|9|D|0|0|0|0|7|D|0^^$0|@$1|2|3|4|5|6|7|18|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|19|8|@$E|1A|F|1B|G|H]]|9|@]|A|$]]|$1|I|3|J|5|D|7|1C|8|@$E|1D|F|1E|G|H]]|9|@]|A|$]]|$1|K|3|L|5|D|7|1F|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|1G|8|@]|9|@]|A|$]]|$1|O|3|P|5|D|7|1H|8|@]|9|@]|A|$]]|$1|Q|3|R|5|D|7|1I|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|1J|8|@$E|1K|F|1L|G|H]]|9|@]|A|$]]|$1|U|3|V|5|6|7|1M|8|@]|9|@]|A|$]]|$1|W|3|X|5|Y|7|1N|8|@]|9|@]|A|$Z|10]]|$1|11|3|12|5|6|7|1O|8|@]|9|@]|A|$]]|$1|13|3|14|5|6|7|1P|8|@$E|1Q|F|1R|G|15]]|9|@]|A|$]]|$1|16|3|-4|5|6|7|1S|8|@]|9|@]|A|$]]]|17|$]]

Implementing the lexicon would look pretty much like this:

<ol>
<li>Use <code>requestSupplementaryLexiconWithCompletion()</code> to get the lexicon upon launch once.</li>
<li>Each type text is inputted add it to a <code>NSString</code> (tracking the current word)</li>
<li>When user presses space (end of curent word) check the string against the lexicon</li>
<li>If it's a match count the number of characters and delete that number of characters</li>
<li>Input the suggestion suggested by the lexicon</li>
<li>Clear the string and start again</li>
</ol>

Additionally you could also use <code>UITextChecker</code> to offer more advanced auto-correct features.

Code (in Objective-C, this may not be 100% accurate I wrote in SO while on the bus but it should do):

<pre><code>UILexicon *lexicon;
NSString *currentString;

-(void)viewDidLoad {
 [self requestSupplementaryLexiconWithCompletion:^(UILexicon *receivedLexicon) {
 self.lexicon = receivedLexicon;
 }];
}

-(IBAction)myTypingAction:(UIButton *)sender {
 [documentProxy insertText:sender.title]; 
 [currentString stringByAppendingString:sender.title];
}

-(IBAction)space {
 [documentProxy insertText:@" "];
 for (UILexiconEntry *lexiconEntry in lexicon.entries) {
 if (lexiconEntry.userInput isEqualToString:currentString) {
 for (int i = 0; currentString.length &gt;=i ; i++) { 
 [documentProxy deleteTextBackwards];
 }
 [documentProxy insertText:lexiconEntry.documentText];
 currentString = @""; 
 }
 } 
}
</code></pre>

Feel free to comment if you have any more questions.

Source: Personal experience with iOS 8 keyboards and UILexicon

blocks|key|784349|text|如果有人还在研究这个问题，我发现了一个非常好的C%2B%2B预测文本库，名为预兆。它似乎做得很好，基于演示，但我有很多困难，试图把它作为一个库(请参阅我的问题这里)。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|784350|让我知道，如果有人有任何想法，非常有兴趣使这个工作！|784351|entityMap|0|LINK|mutability|MUTABLE|url|http://presage.sourceforge.net/|1|https://stackoverflow.com/questions/27016612/compiling-external-c-library-for-use-with-ios-project^0|Y|2|0|23|2|1|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]|$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|X|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]|N|$5|I|J|K|C|$L|O]]]]

In case anyone is still looking into this, I found a really nice C++ predictive text library called <a href="http://presage.sourceforge.net" rel="nofollow noreferrer">Presage</a>. It seems to do a good job based on the demo but I'm having a lot of trouble trying to integrate it as a library (see my question <a href="https://stackoverflow.com/questions/27016612/compiling-external-c-library-for-use-with-ios-project">here</a>). 

Let me know if anyone has any ideas, very interested in getting this working!

blocks|key|784392|text|这就是你真正可以访问词汇词的方式：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|784393|[self+requestSupplementaryLexiconWithCompletion:%5E(UILexicon+*receivedLexicon)+{
++++self.lexicon+=+receivedLexicon;

++++for+(UILexiconEntry+*word+in+self.lexicon.entries)+{
++++++++//+Text+to+be+inserted+into+a+text+input+object+by+a+custom+keyboard,+corresponding+to+the+userInput+value+in+the+same+lexicon+entry.
++++++++NSLog(@"%25@",word.documentText);
++++++++//+Text+to+match,+during+user+input,+to+provide+appropriate+output+to+a+text+document+from+the+documentText+value+in+the+same+lexicon+entry.
++++++++NSLog(@"%25@",word.userInput);
++++}
}];|code-block|syntax|javascript|784394|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This is the way you can actually access Lexicon words:

<pre><code>[self requestSupplementaryLexiconWithCompletion:^(UILexicon *receivedLexicon) {
 self.lexicon = receivedLexicon;

 for (UILexiconEntry *word in self.lexicon.entries) {
 // Text to be inserted into a text input object by a custom keyboard, corresponding to the userInput value in the same lexicon entry.
 NSLog(@"%@",word.documentText);
 // Text to match, during user input, to provide appropriate output to a text document from the documentText value in the same lexicon entry.
 NSLog(@"%@",word.userInput);
 }
}];
</code></pre>

blocks|key|784418|text|关于自动校正，我可以使用链接添加它.下面是我从链接中使用的代码片段：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|784419|UITextChecker+*checker+=+[[UITextChecker+alloc]+init];

++NSRange+checkRange+=+NSMakeRange(0,+self.txView.text.length);

++NSRange+misspelledRange+=+[checker+rangeOfMisspelledWordInString:self.txView.text+
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++range:checkRange
++++++++++++++++++++++++++++++++++++++++++++++++++++++++startingAt:checkRange.location
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++wrap:NO+
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++language:@"en_US"];

++NSArray+*arrGuessed+=+[checker+guessesForWordRange:misspelledRange+inString:self.txView.text+language:@"en_US"];

++self.txView.text+=+[self.txView.text+stringByReplacingCharactersInRange:misspelledRange+
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++withString:[arrGuessed+objectAtIndex:0]];|code-block|syntax|javascript|784420|苹果的全部文档都可以找到这里。|784421|entityMap|0|LINK|mutability|MUTABLE|url|http://www.raywenderlich.com/forums/viewtopic.php?f=2&t=2296|1|https://developer.apple.com/library/prerelease/ios/documentation/UIKit/Reference/UITextChecker_Class/index.html#//apple_ref/occ/clm/UITextChecker/availableLanguages^0|C|2|0|0|0|C|2|1|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|Z|8|@]|9|@$A|10|B|11|1|12]]|C|$]]|$1|K|3|-4|5|6|7|13|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]|S|$5|N|O|P|C|$Q|T]]]]

With regards to auto-correction, I was able to add it using <a href="http://www.raywenderlich.com/forums/viewtopic.php?f=2&amp;t=2296" rel="noreferrer">link</a>. Here's the code snippet I used from the link:

<pre><code>UITextChecker *checker = [[UITextChecker alloc] init];

 NSRange checkRange = NSMakeRange(0, self.txView.text.length);

 NSRange misspelledRange = [checker rangeOfMisspelledWordInString:self.txView.text 
 range:checkRange
 startingAt:checkRange.location
 wrap:NO 
 language:@"en_US"];

 NSArray *arrGuessed = [checker guessesForWordRange:misspelledRange inString:self.txView.text language:@"en_US"];

 self.txView.text = [self.txView.text stringByReplacingCharactersInRange:misspelledRange 
 withString:[arrGuessed objectAtIndex:0]];
</code></pre>

The full documentation from Apple can be found <a href="https://developer.apple.com/library/prerelease/ios/documentation/UIKit/Reference/UITextChecker_Class/index.html#//apple_ref/occ/clm/UITextChecker/availableLanguages" rel="noreferrer">here</a>.

blocks|key|2392532|text|实际上，UILexicon只是获取一些特定于用户的单词的一种方式，而您的拼写检查系统不应该试图修复这些单词。也许，使用它的最常见的方法是填写UITextChecker被忽略的单词列表。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2392533|let+lexicon:+UILexicon+=+...
let+checker:+UITextChecker+=+...

for+entry+in+lexicon.entries+{
++++if+entry.documentText+==+entry.userInput+{
++++++++checker.ignoreWord(entry.documentText)
++++}
}|code-block|syntax|javascript|2392534|此外，UILexicon可以作为自动替换快捷键("omw“=+"On+my+way!")的来源，但就拼写而言，它不是自动更正。|2392535|entityMap^0|4|9|1Y|D|0|0|3|9|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|X|8|@]|D|@]|E|$]]]|N|$]]

Actually, <code>UILexicon</code> is just a way to get some user-specific words that your spellchecking system should't try to fix. Probably, the most common way to use it is to fill out <code>UITextChecker</code>'s list of ignored words.

<pre><code>let lexicon: UILexicon = ...
let checker: UITextChecker = ...

for entry in lexicon.entries {
 if entry.documentText == entry.userInput {
 checker.ignoreWord(entry.documentText)
 }
}
</code></pre>

Additionally, <code>UILexicon</code> can be used as source of autoreplaced shortcuts like ("omw" = "On my way!"), but it is not autocorrection in terms of spelling.

blocks|key|784465|text|您可以为AutoCorrect使用下面的逻辑&它也将在iOS+10中工作|type|unstyled|depth|inlineStyleRanges|entityRanges|data|784466|-(void)didClickAtAlphaNumericKeyboardKey:(NSString+*)value+{

++++if+([value+isEqualToString:@"+"])+{
++++++++++++UITextChecker+*checker+=+[[UITextChecker+alloc]+init];
++++++++++++currentString+=+self.textDocumentProxy.documentContextBeforeInput;
++++++++++++NSCharacterSet+*charSet+=+[NSCharacterSet+whitespaceAndNewlineCharacterSet];
++++++++++++NSArray+*components+=+[currentString+componentsSeparatedByCharactersInSet:charSet];
++++++++++++NSString+*lastWord+=+components.lastObject;

++++++++++++NSRange+checkRange+=+NSMakeRange(0,+lastWord.length);
++++++++++++NSRange+misspelledRange+=+[checker+rangeOfMisspelledWordInString:lastWord
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++range:checkRange
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++startingAt:checkRange.location
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++wrap:NO
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++language:@"en_US"];

++++++++++++NSArray+*guessedWord+=+[checker+guessesForWordRange:misspelledRange+inString:lastWord+language:@"en_US"];

++++++++++++if+(guessedWord+&&+guessedWord.count+>+0)+{
++++++++++++++++for+(int+i+=+0;+lastWord.length+>i+;+i%2B%2B)+{
++++++++++++++++++++[self.textDocumentProxy+deleteBackward];
++++++++++++++++}
++++++++++++++++[self.textDocumentProxy+insertText:[guessedWord+objectAtIndex:0]];
++++++++++++}
++++}

++++[self.textDocumentProxy+insertText:value];
}|code-block|syntax|javascript|784467|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can use below logic for AutoCorrect &amp; it will also work in iOS 10

<pre><code>-(void)didClickAtAlphaNumericKeyboardKey:(NSString *)value {

 if ([value isEqualToString:@" "]) {
 UITextChecker *checker = [[UITextChecker alloc] init];
 currentString = self.textDocumentProxy.documentContextBeforeInput;
 NSCharacterSet *charSet = [NSCharacterSet whitespaceAndNewlineCharacterSet];
 NSArray *components = [currentString componentsSeparatedByCharactersInSet:charSet];
 NSString *lastWord = components.lastObject;

 NSRange checkRange = NSMakeRange(0, lastWord.length);
 NSRange misspelledRange = [checker rangeOfMisspelledWordInString:lastWord
 range:checkRange
 startingAt:checkRange.location
 wrap:NO
 language:@"en_US"];

 NSArray *guessedWord = [checker guessesForWordRange:misspelledRange inString:lastWord language:@"en_US"];

 if (guessedWord &amp;&amp; guessedWord.count &gt; 0) {
 for (int i = 0; lastWord.length &gt;i ; i++) {
 [self.textDocumentProxy deleteBackward];
 }
 [self.textDocumentProxy insertText:[guessedWord objectAtIndex:0]];
 }
 }

 [self.textDocumentProxy insertText:value];
}
</code></pre>

blocks|key|227059|text|Rachit在上面的答案在斯威夫特4.与iOS+12工作|type|unstyled|depth|inlineStyleRanges|entityRanges|data|227060|我有这个助手来检查是否要由UITextChecker测试的当前字符串不是空格|227061|func+validate(string:+String?)+->+Bool+{
++++guard+let+text+=+string,
++++++++!text.trimmingCharacters(in:+CharacterSet.whitespacesAndNewlines).isEmpty+else+{
++++++++++++return+false
++++}
++++return+true
}|code-block|syntax|javascript|227062|然后文本检查器在我的“空格”、“空格键双击”和“返回”方法中。下面的示例在我的"Space“方法中。|227063|let+textChecker+=+UITextChecker()
++++let+currentString+=+self.textDocumentProxy.documentContextBeforeInput
++++if+validate(string:+currentString)+{
++++++++let+charSet+=+NSCharacterSet.whitespacesAndNewlines
++++++++let+components+=+currentString?.components(separatedBy:+charSet)
++++++++let+lastWord+=+components?.last
++++++++let+checkRange+=+NSMakeRange(0,+lastWord?.count+??+0)
++++++++let+misspelledRange+=+textChecker.rangeOfMisspelledWord(in:+lastWord!,+range:+checkRange,+startingAt:+checkRange.location,+wrap:+false,+language:+"en_US")
++++++++if+misspelledRange.length+!=+0+{
++++++++++++let+guessedWord:+Array+=+textChecker.guesses(forWordRange:+misspelledRange,+in:+lastWord!,+language:+"en_US")!
++++++++++++if++guessedWord.count+>+0+{
++++++++++++++++var+i+=+0
++++++++++++++++while+(lastWord?.length)!+>+i+{
++++++++++++++++++++textDocumentProxy.deleteBackward()
++++++++++++++++++++i+%2B=+1
++++++++++++++++}
++++++++++++++++self.textDocumentProxy.insertText(guessedWord[0])

++++++++++++}
++++++++}
++++}


++++self.textDocumentProxy.insertText("+")|227064|我不得不对Rachits代码做两次修改。首先验证currentString，因为如果您按两次空格键，它会抛出一个异常。第二，检查拼写错误的范围是否不是0，因为这也抛出了一个异常，我还没有弄清楚原因。但现在这对我来说是可行的。|227065|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

Rachits answer above in swift 4. Works with iOS 12

I have this helper to check wether the current string to be tested by UITextChecker is not a space 

<pre><code>func validate(string: String?) -&gt; Bool {
 guard let text = string,
 !text.trimmingCharacters(in: CharacterSet.whitespacesAndNewlines).isEmpty else {
 return false
 }
 return true
}
</code></pre>

The text checker is then in my "Spacebar", "Spacebar double tapped" &amp; "return" methods. The example below is in my "Space" method

<pre><code>let textChecker = UITextChecker()
 let currentString = self.textDocumentProxy.documentContextBeforeInput
 if validate(string: currentString) {
 let charSet = NSCharacterSet.whitespacesAndNewlines
 let components = currentString?.components(separatedBy: charSet)
 let lastWord = components?.last
 let checkRange = NSMakeRange(0, lastWord?.count ?? 0)
 let misspelledRange = textChecker.rangeOfMisspelledWord(in: lastWord!, range: checkRange, startingAt: checkRange.location, wrap: false, language: "en_US")
 if misspelledRange.length != 0 {
 let guessedWord: Array = textChecker.guesses(forWordRange: misspelledRange, in: lastWord!, language: "en_US")!
 if guessedWord.count &gt; 0 {
 var i = 0
 while (lastWord?.length)! &gt; i {
 textDocumentProxy.deleteBackward()
 i += 1
 }
 self.textDocumentProxy.insertText(guessedWord[0])

 }
 }
 }


 self.textDocumentProxy.insertText(" ")
</code></pre>

I had to make two changes to Rachits code. First to validate the currentString since it throws an exception if you press space bar twice. And second to check if the misspelled range is not 0 because that was also throwing an exception which I am yet to figure out why. But this works for me now as is.

I want to use the autocorrection and shortcut list like default English keyboard with my custom keyboard.
I check the in keyboard document but don't know how to use it.

In <a href="https://developer.apple.com/library/prerelease/ios/documentation/General/Conceptual/ExtensibilityPG/Keyboard.html#//apple_ref/doc/uid/TP40014214-CH16-SW1">keyboard documentation</a>.

Every custom keyboard (independent of the value of its RequestsOpenAccess key) has access to a basic autocorrection lexicon through the UILexicon class. Make use of this class, along with a lexicon of your own design, to provide suggestions and autocorrections as users are entering text. The UILexicon object contains words from various sources, including:

<ul>
<li>Unpaired first names and last names from the user’s Address Book database</li>
<li>Text shortcuts defined in the Settings > General > Keyboard > Shortcuts list</li>
<li>A common words dictionary</li>
</ul>

How to access shortcut list and input from our dictionary in Objective-C?

How to use UILexicon with requestSupplementaryLexiconWithCompletion?

How to use autocorrection and shortcut list in iOS8 custom keyboard?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我想使用自动更正和快捷方式列表，像默认英语键盘与我的自定义键盘。我检查了键盘文档，但不知道如何使用它。在中。每个自定义键盘(独立于其RequestsOpenAccess键的值)都可以通过UILexicon类访问一个基本的自动更正词典。使用这个类，连同你自己设计的词典，在用户输入文本时提供建议和自动更正。UILexico...

问如何在iOS8自定义键盘中使用自动更正和快捷方式列表？
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问如何在iOS8自定义键盘中使用自动更正和快捷方式列表？EN