可点击的富文本字符串

UILabel+attributeTextAction.h

#import <UIKit/UIKit.h>

@interface TextModel : NSObject

@property (nonatomic, copy) NSString *str;

@property (nonatomic, assign) NSRange range;

@end


@interface UILabel (attributeTextAction)


/**
 给文本添加点击事件（使用字符串标记）

 @param strings 需要添加点击事件的字符串数组
 @param tapClick 点击的回调block
 */
- (void)addAttributeActionWithStrings:(NSArray *)strings
                                 tapTargetAction:(void (^) (NSString *string ,                                                               NSRange range ,
                                    NSInteger index))tapClick;

/**
 给文本添加点击事件（使用范围标记）

 @param tapRange 需要添加点击事件的范围数组
 @param tapClick 点击的回调block
 */
- (void)addAttributeActionWithRange:(NSArray*)tapRange
                         tapTargetAction:(void (^)
                                          (NSString *string , NSRange range , NSInteger index))tapClick;


@end

#import "UILabel+attributeTextAction.h"
#import <objc/runtime.h>
#import <CoreText/CoreText.h>
#import <Foundation/Foundation.h>

@implementation TextModel


@end


@implementation UILabel (attributeTextAction)

#pragma mark - AssociatedObjects
- (NSMutableArray *)attributeStrings
{
    return objc_getAssociatedObject(self, _cmd);
}

- (void)setAttributeStrings:(NSMutableArray *)attributeStrings
{
    objc_setAssociatedObject(self, @selector(attributeStrings), attributeStrings, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}

- (void (^)(NSString *, NSRange, NSInteger))tapBlock
{
    return objc_getAssociatedObject(self, _cmd);
}

- (void)setTapBlock:(void (^)(NSString *, NSRange, NSInteger))tapBlock
{
    objc_setAssociatedObject(self, @selector(tapBlock), tapBlock, OBJC_ASSOCIATION_COPY_NONATOMIC);
}

#pragma mark - mainFunction
- (void)addAttributeActionWithStrings:(NSArray *)strings
                      tapTargetAction:(void (^) (NSString *string ,NSRange range ,NSInteger index))tapClick
{
    [self getRangesWithStrings:strings];

    if (self.tapBlock != tapClick) {
        self.tapBlock = tapClick;
    }
}

- (void)addAttributeActionWithRange:(NSArray*)tapRange
                    tapTargetAction:(void (^)(NSString *
                        string , NSRange range , NSInteger index))tapClick
{
    
    __block  NSString *totalStr = self.attributedText.string;
    NSMutableArray *stringArray = [[NSMutableArray alloc] init];
    for (NSValue *value in tapRange) {
        NSRange range = [value rangeValue];
        NSString *subString = [totalStr substringWithRange:range];
        [stringArray addObject:subString];
    }
    [self getRangesWithStrings:stringArray];
    
    if (self.tapBlock != tapClick) {
        self.tapBlock = tapClick;
    }
}

#pragma mark - getRange
- (void)getRangesWithStrings:(NSArray <NSString *>  *)strings
{
    
    __block  NSString *totalStr = self.attributedText.string;
    
    self.attributeStrings = [NSMutableArray array];
    
    __weak typeof(self) weakSelf = self;
    
    [strings enumerateObjectsUsingBlock:^(NSString * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
        
        NSRange range = [totalStr rangeOfString:obj];
        
        if (range.length != 0) {
            totalStr = [totalStr stringByReplacingCharactersInRange:range withString:[weakSelf getStringWithRange:range]];
            
            TextModel *model = [[TextModel alloc] init];
            model.range = range;
            model.str = obj;
            [weakSelf.attributeStrings addObject:model];
        }
    }];
}

- (NSString *)getStringWithRange:(NSRange)range
{
    NSMutableString *string = [NSMutableString string];
    
    for (int i = 0; i < range.length ; i++) {
        
        [string appendString:@" "];
    }
    return string;
}

#pragma mark - touchAction
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    
    UITouch *touch = [touches anyObject];
    
    CGPoint point = [touch locationInView:self];
    
    __weak typeof(self) weakSelf = self;
    
    [self yb_getTapFrameWithTouchPoint:point result:^(NSString *string, NSRange range, NSInteger index) {
        
        if (weakSelf.tapBlock) {
            weakSelf.tapBlock (string , range , index);
        }
        
//        if (weakSelf.delegate && [weakSelf.delegate respondsToSelector:@selector(yb_attributeTapReturnString:range:index:)]) {
//            [weakSelf.delegate yb_attributeTapReturnString:string range:range index:index];
//        }
        
    }];
}

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
    
//    if (self.isTapAction) {
        if ([self yb_getTapFrameWithTouchPoint:point result:nil]) {
            return self;
        }
//    }
    return [super hitTest:point withEvent:event];
}

#pragma mark - getTapFrame
- (BOOL)yb_getTapFrameWithTouchPoint:(CGPoint)point result:(void (^) (NSString *string , NSRange range , NSInteger index))resultBlock
{
    CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((CFAttributedStringRef)self.attributedText);
    
    CGMutablePathRef Path = CGPathCreateMutable();
    
    CGPathAddRect(Path, NULL, CGRectMake(0, 0, self.bounds.size.width, self.bounds.size.height));
    
    CTFrameRef frame = CTFramesetterCreateFrame(framesetter, CFRangeMake(0, 0), Path, NULL);
    
    CFRange range = CTFrameGetVisibleStringRange(frame);
    
    if (self.attributedText.length > range.length) {
        
        UIFont *font ;
        
        if ([self.attributedText attribute:NSFontAttributeName atIndex:0 effectiveRange:nil]) {
            
            font = [self.attributedText attribute:NSFontAttributeName atIndex:0 effectiveRange:nil];
            
        }else if (self.font){
            font = self.font;
            
        }else {
            font = [UIFont systemFontOfSize:17];
        }
        
        CGPathRelease(Path);
        
        Path = CGPathCreateMutable();
        
        CGPathAddRect(Path, NULL, CGRectMake(0, 0, self.bounds.size.width, self.bounds.size.height + font.lineHeight));
        
        frame = CTFramesetterCreateFrame(framesetter, CFRangeMake(0, 0), Path, NULL);
    }
    
    CFArrayRef lines = CTFrameGetLines(frame);
    
    if (!lines) {
        CFRelease(frame);
        CFRelease(framesetter);
        CGPathRelease(Path);
        return NO;
    }
    
    CFIndex count = CFArrayGetCount(lines);
    
    CGPoint origins[count];
    
    CTFrameGetLineOrigins(frame, CFRangeMake(0, 0), origins);
    
    CGAffineTransform transform = [self yb_transformForCoreText];
    
    CGFloat verticalOffset = 0;
    
    for (CFIndex i = 0; i < count; i++) {
        CGPoint linePoint = origins[i];
        
        CTLineRef line = CFArrayGetValueAtIndex(lines, i);
        
        CGRect flippedRect = [self yb_getLineBounds:line point:linePoint];
        
        CGRect rect = CGRectApplyAffineTransform(flippedRect, transform);
        
        rect = CGRectInset(rect, 0, 0);
        
        rect = CGRectOffset(rect, 0, verticalOffset);
        
        NSParagraphStyle *style = [self.attributedText attribute:NSParagraphStyleAttributeName atIndex:0 effectiveRange:nil];
        
        CGFloat lineSpace;
        
        if (style) {
            lineSpace = style.lineSpacing;
        }else {
            lineSpace = 0;
        }
        
        CGFloat lineOutSpace = (self.bounds.size.height - lineSpace * (count - 1) -rect.size.height * count) / 2;
        
        rect.origin.y = lineOutSpace + rect.size.height * i + lineSpace * i;
        
        if (CGRectContainsPoint(rect, point)) {
            
            CGPoint relativePoint = CGPointMake(point.x - CGRectGetMinX(rect), point.y - CGRectGetMinY(rect));
            
            CFIndex index = CTLineGetStringIndexForPosition(line, relativePoint);
            
            CGFloat offset;
            
            CTLineGetOffsetForStringIndex(line, index, &offset);
            
            if (offset > relativePoint.x) {
                index = index - 1;
            }
            
            NSInteger link_count = self.attributeStrings.count;
            
            for (int j = 0; j < link_count; j++) {
                
                TextModel *model = self.attributeStrings[j];
                
                NSRange link_range = model.range;
                if (NSLocationInRange(index, link_range)) {
                    if (resultBlock) {
                        resultBlock (model.str , model.range , (NSInteger)j);
                    }
                    CFRelease(frame);
                    CFRelease(framesetter);
                    CGPathRelease(Path);
                    return YES;
                }
            }
        }
    }
    CFRelease(frame);
    CFRelease(framesetter);
    CGPathRelease(Path);
    return NO;
}

//- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
//{
//    if (self.isTapEffect) {
//        
//        [self performSelectorOnMainThread:@selector(yb_tapEffectWithStatus:) withObject:nil waitUntilDone:NO];
//        
//    }
//}
//
//- (void)touchesCancelled:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
//{
//    if (self.isTapEffect) {
//        
//        [self performSelectorOnMainThread:@selector(yb_tapEffectWithStatus:) withObject:nil waitUntilDone:NO];
//        
//    }
//}

- (CGAffineTransform)yb_transformForCoreText
{
    return CGAffineTransformScale(CGAffineTransformMakeTranslation(0, self.bounds.size.height), 1.f, -1.f);
}

- (CGRect)yb_getLineBounds:(CTLineRef)line point:(CGPoint)point
{
    CGFloat ascent = 0.0f;
    CGFloat descent = 0.0f;
    CGFloat leading = 0.0f;
    CGFloat width = (CGFloat)CTLineGetTypographicBounds(line, &ascent, &descent, &leading);
    CGFloat height = ascent + fabs(descent) + leading;
    
    return CGRectMake(point.x, point.y , width, height);
}




@end