我正在开发一个消息应用程序,并希望iOS 8中的预测键盘能够识别正在撰写消息的用户正在回复上一个消息.
所以我希望能够将一个字符串提供给键盘,为它提供预测的上下文.因此,如果用户被问及一个可以解释为极性的问题(是/否),那么预测键盘应该是“是”不|也许
这是开发人员可以使用的吗？
请注意,我不是在说自定义键盘,只是给标准键盘提供了一些上下文,因为它是预测的.我也不关心实际定制快速类型的回复as in this question.我只是希望键盘知道它是什么打字.
解决方法
严格地将建议输入到默认键盘是不可能的.但是,如果您想为用户提供相同的体验,我将使用myTextView.autocorrectionType = UITextAutocorrectionTypeNo隐藏iOS建议栏;然后用我自己的自定义视图替换该视图,模仿建议视图直到.一旦用户键入字符或选择了一个选项,然后隐藏自定义建议视图并重新启用iOS建议栏.
我的子类UIInputView只是为了这个(透明度和转换是一点点,但一切都很好).
#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,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,0.5f,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
要将其实现为您已经子类化的UITextField或UITextView,请导入SuggestionView并实现SuggestionViewDelegate.然后,在UITextFieldDelegate(或UITextViewDelegate)方法中,添加：
- (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];
}
然后,实现SuggestionViewDelegate：
- (void)suggestionSelected:(NSString *)suggestion {
[self.messageTextField setText:[NSString stringWithFormat:@"%@%@ ",self.messageTextField.text,suggestion]];
[self removeSuggestionView];
}
虽然这不是一个完美的解决方案,但它确实产生了预期的效果.
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