iOS正则表达式的使用案例-富文本

富文本(正则表达式)

一.新建工程导入图片

二 实现方式一(缺点是只能解决一个图片的替换)

_myLabel.font = [UIFont systemFontOfSize:15];

//@"家里真没人 "

//正则表达式 [] 是特殊字符

NSString *str = @"女神: s012 家里真没人 s010 202 s018 ";

//特殊文本 加表情

//    NSAttributedString *

//1.先创建一个值存放文本的字符串并且填充字符串数据

NSAttributedString *attributedString = [[NSAttributedString alloc]initWithString:str];

//2.创建一个带图片的附件对象

LHQTextAttachment *attachment = [[LHQTextAttachment alloc]init];

//给附件对象增加一个image

attachment.image = [UIImage imageNamed:@"s014.png"];

//3.在创建一个可以存放待图片文本的

NSAttributedString *strImage = [NSAttributedString attributedStringWithAttachment:attachment];

//4.可变属性字符串拼接普通文本和附件文本

NSMutableAttributedString *mAttributedString = [[NSMutableAttributedString alloc]initWithAttributedString:attributedString];

//    [mAttributedString appendAttributedString:attributedString];

//扫描位置 s012//定一个规则

NSString *pattern = @"[s][0-9]{3}";

NSRegularExpression *regular = [NSRegularExpression regularExpressionWithPattern:pattern options:0 error:NULL];

NSTextCheckingResult *result =  [regular firstMatchInString:str options:1 range:NSMakeRange(0, str.length)];

//    result.range =

[mAttributedString replaceCharactersInRange:result.range withAttributedString:strImage];

_myLabel.attributedText = mAttributedString;

实现方式二:

导入分类

#import "NSAttributedString+Emoji.h"

- (void)viewDidLoad {

[super viewDidLoad];

//    _myLabel.font = [UIFont systemFontOfSize:15];

//@"家里真没人 "

//正则表达式 [] 是特殊字符

NSString *str = @"女神: s012 家里真没人 s010 202 s018 ";

NSMutableAttributedString *mAttributedStr = [[NSMutableAttributedString alloc]initWithString:str];

NSAttributedString *attrobutedStr = [NSAttributedString emojiStringWithString:mAttributedStr];

_myLabel.attributedText = attrobutedStr;

}

实现的效果:

---

附件: 分类的代码

.h:

//

//  NSAttributedString+Emoji.h

//  MiYa

//

//  Created by 李洪强 on 17/07/06.

//  Copyright (c) 2017年 . All rights reserved.

//

#import <Foundation/Foundation.h>

@interface NSAttributedString (Emoji)

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

@end

--------------------------------------------------------------------------------------

.m:

//

//  NSAttributedString+Emoji.m

//  MiYa

//

//  Created by 李洪强 on 17/07/06.

//  Copyright (c) 2017年 . All rights reserved.

//

#import "NSAttributedString+Emoji.h"

#import <UIKit/UIKit.h>

@interface EmojiAttachment : NSTextAttachment

@end

@implementation EmojiAttachment

//I want my emoticon has the same size with line's height

- (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:@"s[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;

}

@end

李洪强  2017 07 06于北京