正则表达式之图文混排

    目的 : 实现一句话中既有文字又有图片的功能.

             图文混排又称富文本.

  直接代码演示:

  NSAttributedString+Emoji.h 中 :       

#import <Foundation/Foundation.h>

@interface NSAttributedString (Emoji)

+ (NSAttributedString *)emojiStringWithString:(NSMutableAttributedString *)emojiString;

@end

  NSAttributedString+Emoji.m 中:             

#import "NSAttributedString+Emoji.h"
#import <UIKit/UIKit.h>

@interface EmojiAttachment : NSTextAttachment

@end

@implementation EmojiAttachment

- (CGRect)attachmentBoundsForTextContainer:(NSTextContainer *)textContainer proposedLineFragment:(CGRect)lineFrag glyphPosition:(CGPoint)position characterIndex:(NSUInteger)charIndex
{
    return CGRectMake( 0 , -3, lineFrag.size.height, lineFrag.size.height);
}

@end


@implementation NSAttributedString (Emoji)

+ (NSAttributedString *)emojiStringWithString:(NSMutableAttributedString *)emojiString
{
    NSRegularExpression *regularEx = [NSRegularExpression regularExpressionWithPattern:@"m[0-9]{3}" options:NSRegularExpressionCaseInsensitive error:nil];
    
    NSString *string = emojiString.string;
    
    NSTextCheckingResult *result = [regularEx firstMatchInString:string options:NSMatchingReportCompletion range:NSMakeRange(0, string.length)];
    if (result != nil) {
        NSString *imageName = [NSString stringWithFormat:@"%@.png", [string substringWithRange:result.range]];
        EmojiAttachment *attachment = [[EmojiAttachment alloc] initWithData:nil ofType:nil];
        attachment.image = [UIImage imageNamed:imageName];
        NSAttributedString *attrString = [NSAttributedString attributedStringWithAttachment:attachment];
        
        [emojiString replaceCharactersInRange:result.range withAttributedString:attrString];
        // 递归
        [self emojiStringWithString:emojiString];
    } else {
        return emojiString;
    }
    return emojiString;
}

    在控制器中:   

     

     NSString *string = @"菲尼模式的博客,m006m008 图文混排又称富文本m010 !!! 菲尼模式的博客,m006m008 图文混排又称富文本m010!!!菲尼模式的博客,m006m008 图文混排又称富文本m010!!!";
    self.myLabel.attributedText = [NSAttributedString emojiStringWithString:[[NSMutableAttributedString alloc]initWithString:string]];
    self.myLabel.font = [UIFont boldSystemFontOfSize:23];

     直接把.m 和.h文件放入工程中即可使用.  

实现效果 :