自定义iOS键盘中的快速键入build议
在uitextview中打开键盘时，我想要快速键入build议，以将我自己的某个应用程序级别所需的短语作为build议。
例如，如果用户键入“全部” – 在快捷键suggesstion我想显示“一切正常”或“一切都如预期”。
我可以自定义快速型build议文本吗？
如果没有，键盘打开时可以采用其他方式来显示这些build议。
由于没有（已知的）更改快捷键build议的方法，所以我将UIInputView分类为允许自定义build议作为input附件视图（透明度和转换稍微偏离，但其他一切工作相当好）。
注意 ：如果您已经在您的UITextField或UITextView上有input附件视图，这不起作用。
#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
要将这个实现成UITextField或已经子类化的UITextView ，导入SuggestionView并实现SuggestionViewViewDelegate。 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，执行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scheme，但它确实创造了预期的效果。