Möglich, programmgesteuert feed der iOS-predictive keyboard Kontext/Quelltext?

Streng Eingabe Vorschläge, um die Standard-Tastatur ist nicht möglich. Jedoch, wenn Sie wollen, zu geben, die äquivalente Erfahrung für den Benutzer, würde ich hide iOS-Vorschlag-Leiste mit myTextView.autocorrectionType = UITextAutocorrectionTypeNo; und ersetzen Sie diese Ansicht mit meiner eigenen Ansicht, dass ahmt den Vorschlag in Sicht, bis. Sobald der Benutzer einen Charakter oder wählt eine option, dann verstecken Sie die benutzerdefinierte Vorschlag, Ansicht und aktivieren Sie die iOS-Vorschlag bar.

Ich Unterklassen UIInputView nur für diese (die Transparenz und der übergang ist ein wenig off, aber alles andere funktioniert ziemlich gut).

#import <UIKit/UIKit.h>

@protocol SuggestionViewDelegate <NSObject>

@required
- (void)suggestionSelected:(NSString *)suggestion;

@end

@interface SuggestionView : UIInputView

- (instancetype)init;
- (instancetype)initWithFrame:(CGRect)frame;

/**
 *  The list of suggestions being displayed.
 *  The array contains 0-3 strings.
 *
 *  @return Array of NSString's representing the current suggested strings
 */
- (NSArray *)suggestions;

/**
 *  Add a suggestion to display in the view.
 *  If there are already maxSuggestionCount suggestions, the added suggestion will push one of them out.
 *  If there are already maxSuggestionCount suggestions and the input is 'nil' then the last suggestion will be removed.
 *
 *  @param suggestion String to suggest to the user
 */
- (void)addSuggestion:(NSString *)suggestion;

/**
 *  Removes the suggestion from the list of displayed suggestions.
 *  If the string is not in the set then there is no change made.
 *
 *  @param suggestion NSString to remove from the suggested strings
 */
- (void)removeSuggestion:(NSString *)suggestion;

/**
 *  Takes in either NSArray or NSSet and replaces 'suggestions' with the input. 
 *  Only the first three arguments are recognized.
 *  Objects should be strings. Undefined behavior otherwise.
 *
 *  @param suggestions NSArray or NSSet with 0-3 NSStrings
 */
- (void)setSuggestions:(NSObject *)suggestions;

@property (weak) id <SuggestionViewDelegate> delegate;

/**
 *  The maximum number of suggestions allowed. Default is 3.
 */
@property (nonatomic) NSInteger maxSuggestionCount;

@end

#import "SuggestionView.h"

#define kScreenWidth [UIScreen mainScreen].bounds.size.width

@implementation SuggestionView {
    NSMutableOrderedSet *_suggestions;
    NSMutableArray *_suggestionButtons;
}

- (instancetype)init {
    self = [self initWithFrame:CGRectMake(0.0f, 0.0f, kScreenWidth, 36.0f)];

    if (self) {

    }

    return self;
}

- (instancetype)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame inputViewStyle:UIInputViewStyleKeyboard];

    if (self) {
        _suggestions = [[NSMutableOrderedSet alloc] initWithCapacity:3];
        self.maxSuggestionCount = 3;
        _suggestionButtons = [[NSMutableArray alloc] init];
        self.backgroundColor = [UIColor colorWithWhite:0.0f alpha:0.04f];
    }

    return self;
}

#pragma mark - Modifying Suggestions

- (void)addSuggestion:(NSString *)suggestion {
    if (suggestion) {
        [_suggestions addObject:suggestion];
    }

    while (_suggestions.count > self.maxSuggestionCount) {
        [_suggestions removeObjectAtIndex:self.maxSuggestionCount];
    }
}

- (void)removeSuggestion:(NSString *)suggestion {
    [_suggestions removeObject:suggestion];
}

- (void)setSuggestions:(NSObject *)suggestions {
    if ([suggestions respondsToSelector:@selector(countByEnumeratingWithState:objects:count:)]) {
        [_suggestions removeAllObjects];

        for (NSString *suggestion in (NSArray *)suggestions) {
            if (_suggestions.count < self.maxSuggestionCount) {
                [_suggestions addObject:suggestion];
            } else {
                break;
            }
        }
    }
}

- (NSArray *)suggestions {
    NSMutableArray *suggestionsArray = [[NSMutableArray alloc] initWithCapacity:_suggestions.count];
    for (NSString *suggestion in _suggestions) {
        [suggestionsArray addObject:suggestion];
    }

    return suggestionsArray;
}

#pragma mark - Visual Layout of Suggestions

- (void)layoutSubviews {
    [self layoutSuggestions];
}

- (void)layoutSuggestions {
    for (UIView *subview in _suggestionButtons) {
        [subview removeFromSuperview];
    }

    [_suggestionButtons removeAllObjects];

    for (int i = 0; i < _suggestions.count; i++) {
        NSString *suggestion = _suggestions[i];
        UIButton *suggestionButton = [[UIButton alloc] initWithFrame:CGRectMake(i * self.bounds.size.width/_suggestions.count, 0.0f, self.bounds.size.width/_suggestions.count, self.bounds.size.height)];
        [suggestionButton setTitle:suggestion forState:UIControlStateNormal];
        suggestionButton.titleLabel.adjustsFontSizeToFitWidth = YES;
        suggestionButton.titleLabel.textAlignment = NSTextAlignmentCenter;
        [suggestionButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
        [suggestionButton addTarget:self action:@selector(buttonTouched:) forControlEvents:UIControlEventTouchUpInside];
        [self addSubview:suggestionButton];

        if (i > 0) {
            UIView *whiteLine = [[UIView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 0.5f, self.bounds.size.height)];
            whiteLine.backgroundColor = [UIColor whiteColor];
            [suggestionButton addSubview:whiteLine];
        }

        [_suggestionButtons addObject:suggestionButton];
    }
}

#pragma mark - Selecting a Suggestion

- (void)buttonTouched:(UIButton *)button {
    NSTimeInterval animationDuration = 0.09f;
    [UIView animateWithDuration:animationDuration animations:^{
        [button setBackgroundColor:[UIColor whiteColor]];

        if ([self.delegate respondsToSelector:@selector(suggestionSelected:)]) {
            [self performSelector:@selector(suggestionSelected:) withObject:button.currentTitle afterDelay:animationDuration * 0.9f];
        }

        [button performSelector:@selector(setBackgroundColor:) withObject:[UIColor clearColor] afterDelay:animationDuration];
    }];
}

- (void)suggestionSelected:(NSString *)suggestion {
    if ([self.delegate respondsToSelector:@selector(suggestionSelected:)]) {
        [self.delegate suggestionSelected:suggestion];
    }
}

@end

Implementieren diese in eine UITextField oder UITextView dass Sie bereits untergeordnet haben, importieren Sie die SuggestionView und Umsetzung der SuggestionViewDelegate. Dann, in der UITextFieldDelegate (oder UITextViewDelegate) Methoden hinzufügen:

- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField {
    if ([textField isEqual:self.messageTextField]) {
        if (self.suggestionView.suggestions.count > 0 && textField.text.length == 0) {
            textField.inputAccessoryView = self.suggestionView;
            textField.autocorrectionType = UITextAutocorrectionTypeNo;
            [textField reloadInputViews];
        }
    }

    return YES;
}

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
    if ([textField isEqual:self.messageTextField]) {
        if (string.length > 0) {
            [self removeSuggestionView];
        }
    }

    return YES;
}


- (void)removeSuggestionView {
    self.messageTextField.inputAccessoryView = nil;
    [self.messageTextField setInputAccessoryView:nil];
    self.messageTextField.autocorrectionType = UITextAutocorrectionTypeYes;
    [self.messageTextField reloadInputViews];

    [self.messageTextField performSelector:@selector(resignFirstResponder) withObject:self afterDelay:0.0f];
    [self.messageTextField performSelector:@selector(becomeFirstResponder) withObject:self afterDelay:0.0f];
}

Dann implementieren Sie die SuggestionViewDelegate:

- (void)suggestionSelected:(NSString *)suggestion {
    [self.messageTextField setText:[NSString stringWithFormat:@"%@%@ ", self.messageTextField.text, suggestion]];
    [self removeSuggestionView];
}

Zwar ist dies nicht eine perfekte Lösung, es erzeugt den gewünschten Effekt.