新浪微博-首页的普通文本转换富文本

来源：互联网发布：银行大数据分析现状编辑：程序博客网时间：2024/04/30 05:40

主要是利用正则表达式，匹配是否有【】，但是正则表达式只能反别获取匹配的字符串，和不匹配的字符串，需要匹配两次，需要把每一次取出来的的字符串和范围和是否是表情的bool值，这时候自定义一个模型

@interface LSRegexResult : NSObject//匹配到的字符串@property (nonatomic, copy) NSString *string;//匹配到的范围@property(nonatomic,assign) NSRange range;//是否是表情@property(nonatomic,assign,getter=isEmotion) BOOL emotion;

所以这时候需要一个数组把遍历取到的字符串添加到数组中，然后按照range.location进行排序，创建可变的富文本，然后在遍历排序完的数组，根据LSRegexResult.isEmotion判断是插入什么，是则创建自定义的LSTextAttachment（NSTextAttachment）即显示图片表情的配件，然后根据此配件创建一个富文本添加到可变富文本中，如果是字符串需要匹配@ 话题#话题# 还有超链接，需要利用正则表达式匹配，然后创建一个富文本，并添加属性，并让其蓝色显示，还需要把对应的字符串添加到属性中，方便在进行事件处理时判断是否是一个链接，还方便取出对应的内容，然后添加到可变富文本中

遍历普通文本，对数组排序

-(NSArray*)createAttributedArrayWithText:(NSString *)text{    NSMutableArray *results=[NSMutableArray array];    NSString *regex=@"\\[[a-zA-Z0-9\\u4e00-\\u9fa5]+\\]";    //匹配表情    [text enumerateStringsMatchedByRegex:regex usingBlock:^(NSInteger captureCount, NSString *const __unsafe_unretained *capturedStrings, const NSRange *capturedRanges, volatile BOOL *const stop) {        LSRegexResult *regexResult=[[LSRegexResult alloc]init];        regexResult.string=*capturedStrings;//        NSLog(@"string======%@",*capturedStrings);        regexResult.range=*capturedRanges;        regexResult.emotion=YES;        [results addObject:regexResult];    }];    //匹配非表情    [text enumerateStringsSeparatedByRegex:regex usingBlock:^(NSInteger captureCount, NSString *const __unsafe_unretained *capturedStrings, const NSRange *capturedRanges, volatile BOOL *const stop) {        LSRegexResult *regexResult=[[LSRegexResult alloc]init];        regexResult.string=*capturedStrings;        regexResult.range=*capturedRanges;        regexResult.emotion=NO;        [results addObject:regexResult];    }];    //对数组进行排序    [results sortUsingComparator:^NSComparisonResult(LSRegexResult * obj1, LSRegexResult* obj2) {        int loc1=obj1.range.location;        int loc2=obj2.range.location;        return  [ @(loc1) compare:@(loc2)];    }];    return results;}

遍历排序后的数组，匹配@ 话题等，

-(NSMutableAttributedString*)attributedStringWithText:(NSString*)text{    //匹配字符串    NSArray *results= [self createAttributedArrayWithText:text];    //遍历数组    NSMutableAttributedString *attributedString=[[NSMutableAttributedString alloc]init];    [results enumerateObjectsUsingBlock:^(LSRegexResult * obj, NSUInteger idx, BOOL * _Nonnull stop) {        LSEmotion *emotion=nil;        if (obj.isEmotion) {//是表情            emotion=[LSEmotionTool emotionWithText:obj.string];//是一个工具类就是遍历表情数组，直到描述和此描述相等        }        if (emotion) {//找到对应表情 <span style="background-color: rgb(240, 240, 240);">这里为什么需要判断因为有可能新浪返回的表情，本地没有</span>                        LSTextAttachment *atach=[[LSTextAttachment alloc]init];            atach.emotion=emotion;            atach.bounds=CGRectMake(0, -3, LSTextFont.lineHeight, LSTextFont.lineHeight);            NSAttributedString *att=[NSAttributedString attributedStringWithAttachment:atach];            [attributedString appendAttributedString:att];                    }else {//没找到对应表情            NSMutableAttributedString *subStr=[[NSMutableAttributedString alloc]initWithString:obj.string];            //匹配#话题#            NSString *trendRegex = @"#[a-zA-Z0-9\\u4e00-\\u9fa5]+#";            [obj.string enumerateStringsMatchedByRegex:trendRegex usingBlock:^(NSInteger captureCount, NSString *const __unsafe_unretained *capturedStrings, const NSRange *capturedRanges, volatile BOOL *const stop) {                [subStr addAttribute:NSForegroundColorAttributeName value:LSHighTextColor range:*capturedRanges];                [subStr addAttribute:LSHighLink value:*capturedStrings range:*capturedRanges];            }];            //匹配超链接            NSString *httpRegex = @"http(s)?://([a-zA-Z|\\d]+\\.)+[a-zA-Z|\\d]+(/[a-zA-Z|\\d|\\-|\\+|_./?%&=]*)?";            [obj.string enumerateStringsMatchedByRegex:httpRegex usingBlock:^(NSInteger captureCount, NSString *const __unsafe_unretained *capturedStrings, const NSRange *capturedRanges, volatile BOOL *const stop) {                [subStr addAttribute:NSForegroundColorAttributeName value:LSHighTextColor range:*capturedRanges];                [subStr addAttribute:LSHighLink value:*capturedStrings range:*capturedRanges];            }];            //匹配@            NSString *mentionRegex = @"@[a-zA-Z0-9\\u4e00-\\u9fa5\\-_]+";            [obj.string enumerateStringsMatchedByRegex:mentionRegex usingBlock:^(NSInteger captureCount, NSString *const __unsafe_unretained *capturedStrings, const NSRange *capturedRanges, volatile BOOL *const stop) {                [subStr addAttribute:NSForegroundColorAttributeName value:LSHighTextColor range:*capturedRanges];                [subStr addAttribute:LSHighLink value:*capturedStrings range:*capturedRanges];            }];            [attributedString  appendAttributedString:subStr];        }            }];    //设置字体    [attributedString addAttribute:NSFontAttributeName value:LSTextFont range:NSMakeRange(0, attributedString.length)];    return attributedString;}

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