UILabel长按识别文本

WordDetectLabel.h

#import <UIKit/UIKit.h>

NS_ASSUME_NONNULL_BEGIN

@interface WordDetectLabel : UILabel


@end

NS_ASSUME_NONNULL_END

WordDetectLabel.m

#import "WordDetectLabel.h"
@interface WordDetectLabel()
@property (nonatomic, strong) UILabel *highlightLabel;  // 用于显示放大的单词
@property (nonatomic, strong) NSString *selectedWord;   // 被选中的单词
@end
@implementation WordDetectLabel



// 初始化
- (instancetype)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (self) {
        [self initialize];
    }
    return self;
}

- (void)awakeFromNib {
    [super awakeFromNib];
}

- (void)initialize {
    self.userInteractionEnabled = YES;
    UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleLongPress:)];
    [self addGestureRecognizer:longPress];
}

// 布局更新时调整文本容器大小
- (void)layoutSubviews {
    [super layoutSubviews];
}

// 长按手势处理
- (void)handleLongPress:(UILongPressGestureRecognizer *)gesture {
    CGPoint touchPoint = [gesture locationInView:self];
    
    if (gesture.state == UIGestureRecognizerStateBegan) {
        // 更新 textStorage 数据
        NSLayoutManager *layoutManager = [[NSLayoutManager alloc] init];
        NSTextContainer *textContainer = [[NSTextContainer alloc] initWithSize:CGSizeZero];
        NSTextStorage *textStorage;

        NSMutableParagraphStyle *paragraphStyle = NSMutableParagraphStyle.new;
        paragraphStyle.alignment = self.textAlignment;
        // Configure textContainer
        textContainer.lineFragmentPadding = 0.0;
        textContainer.lineBreakMode = self.lineBreakMode;
        textContainer.maximumNumberOfLines = self.numberOfLines;

        CGPoint locationOfTouchInLabel = touchPoint;
        CGSize labelSize = gesture.view.bounds.size;
        textContainer.size = self.bounds.size;

        NSMutableAttributedString *attributedText = [[NSMutableAttributedString alloc] initWithAttributedString:self.attributedText];
        [attributedText addAttributes:@{NSFontAttributeName: self.font, NSParagraphStyleAttributeName: paragraphStyle} range:NSMakeRange(0,self.attributedText.string.length)];
        textStorage = [[NSTextStorage alloc] initWithAttributedString:attributedText];

        // Configure layoutManager and textStorage
        [layoutManager addTextContainer:textContainer];
        [textStorage addLayoutManager:layoutManager];

        CGRect textBoundingBox = [layoutManager usedRectForTextContainer:textContainer];
        CGPoint textContainerOffset = CGPointMake((labelSize.width - textBoundingBox.size.width) * 0.5 - textBoundingBox.origin.x,
                                                  (labelSize.height - textBoundingBox.size.height) * 0.5 - textBoundingBox.origin.y);

        CGPoint locationOfTouchInTextContainer = CGPointMake(locationOfTouchInLabel.x - textContainerOffset.x,
                                                             locationOfTouchInLabel.y - textContainerOffset.y);

        NSInteger indexOfCharacter = [layoutManager characterIndexForPoint:locationOfTouchInTextContainer
                                                                inTextContainer:textContainer
                                       fractionOfDistanceBetweenInsertionPoints:nil];

        NSRange range = [self wordRangeAtIndex:indexOfCharacter inText:self.text];
        if (range.location != NSNotFound) {
            NSString *value = [self.text substringWithRange:range];
            NSLog(@"选中的单词%@" , value);
        } else {
            NSLog(@"未获取到单词");
        }
        
    } else if (gesture.state == UIGestureRecognizerStateEnded || gesture.state == UIGestureRecognizerStateCancelled) {
        [self removeHighlightedWord];
    }
}
// 正则匹配触摸点所在的单词范围
- (NSRange)wordRangeAtIndex:(NSUInteger)index inText:(NSString *)text {
    NSRange range = NSMakeRange(0, text.length);
    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"\\b\\w+\\b" options:0 error:nil];
    NSArray *matches = [regex matchesInString:text options:0 range:range];
    
    for (NSTextCheckingResult *result in matches) {
        if (NSLocationInRange(index, result.range)) {
            return result.range; // 返回匹配单词的范围
        }
    }
    return NSMakeRange(NSNotFound, 0);
}

// 显示高亮的单词
- (void)showHighlightedWord:(NSString *)word atPoint:(CGPoint)point {

}

// 移除高亮显示
- (void)removeHighlightedWord {

}