UIInputViewController自定义键盘

@protocol UITextDocumentProxy <UIKeyInput>

@property (nullable, nonatomic, readonly) NSString *documentContextBeforeInput;
@property (nullable, nonatomic, readonly) NSString *documentContextAfterInput;
@property (nullable, nonatomic, readonly) NSString *selectedText API_AVAILABLE(ios(11.0));

// An app can store UITextInputMode in its document context, when user switches to the document, the host will pass the inputMode as documentInputMode to the UIInputViewController,
// which can switch to the inputMode and set primaryLanguage if it supports it.
@property (nullable, nonatomic, readonly) UITextInputMode *documentInputMode NS_AVAILABLE_IOS(10_0);

@property (nonatomic, readonly, copy) NSUUID *documentIdentifier API_AVAILABLE(ios(11.0));

• (void)adjustTextPositionByCharacterOffset:(NSInteger)offset;

@end

NS_CLASS_AVAILABLE_IOS(8_0) @interface UIInputViewController : UIViewController <UITextInputDelegate>

@property (nullable, nonatomic, strong) UIInputView *inputView;

@property (nonatomic, readonly) id <UITextDocumentProxy> textDocumentProxy;

// The primary language of the UIInputViewController. A BCP 47 language identifier such as en-US
// If specified, this will supersede any PrimaryLanguage in the Info.plist.
@property (nullable, nonatomic, copy) NSString *primaryLanguage;

// When this property is set to YES, the system dictation key, if provided, will be disabled.
@property (nonatomic) BOOL hasDictationKey;

@property (nonatomic, readonly) BOOL hasFullAccess API_AVAILABLE(ios(11.0));
@property (nonatomic, readonly) BOOL needsInputModeSwitchKey API_AVAILABLE(ios(11.0));

• (void)dismissKeyboard;
• (void)advanceToNextInputMode;

// Launch inputMode list above the view when long pressing or swiping up from the view,
// Advance to nextInputMode when short tapping on the view.
// Example: [KeyboardButton addTarget:self action:@selector(handleInputModeListFromView:withEvent:) forControlEvents:UIControlEventAllTouchEvents].

• (void)handleInputModeListFromView:(nonnull UIView *)view withEvent:(nonnull UIEvent *)event NS_AVAILABLE_IOS(10_0);

// This will not provide a complete repository of a language's vocabulary.
// It is solely intended to supplement existing lexicons.

• (void)requestSupplementaryLexiconWithCompletion:(void (^)(UILexicon *))completionHandler;