新浪微博客户端(51)-将表情图片转换为文本

DJEmotionTextView 转换方法

- (NSMutableString *)fullText {

    NSMutableString *text = [[NSMutableString alloc] init];
    // 遍历当前attributedText,此API会自动分割attributedText中存在的文本,Emoji,表情，且每遍历一次会调用usingBlock,block中传入的
    // attrs,range 分别代表文本或表情的属性和范围
    [self.attributedText enumerateAttributesInRange:NSMakeRange(0, self.attributedText.length) options:0 usingBlock:^(NSDictionary<NSString *,id> * _Nonnull attrs, NSRange range, BOOL * _Nonnull stop) {

        DJEmotionAttachment *attachment = attrs[@"NSAttachment"];
        // 取出属性字典中的NSAttachment属性所对应的值
        if (!attachment) { // 没有附件(纯文本,Emoji)
            
            // 根据返回的range截取指定的attributedText
            NSAttributedString *str = [self.attributedText attributedSubstringFromRange:range];
            [text appendString:str.string]; // 将NSAttributedString转换为NSString 拼接文本
            
        } else { // 有附件(表情图片) 需要取出表情图片对应的文本
            [text appendString:attachment.emotion.chs]; // 拼接文本
        }
        
    }];

    return text;
}

DJEmotionAttachment.h

#import <UIKit/UIKit.h>

@class DJEmotion;
@interface DJEmotionAttachment : NSTextAttachment

/** 表情实体 */
@property (nonatomic,strong) DJEmotion *emotion;

@end

DJEmotionAttachment.m

#import "DJEmotionAttachment.h"
#import "DJEmotion.h"


@implementation DJEmotionAttachment

- (void)setEmotion:(DJEmotion *)emotion {
    _emotion = emotion;
    
    NSString *emotionName = emotion.png;
    NSString *imagePath;
    if ([emotionName hasPrefix:@"d_"] || [emotionName hasPrefix:@"f_"] ||
        [emotionName hasPrefix:@"h_"] || [emotionName hasPrefix:@"l_"] || [emotionName hasPrefix:@"o_"] || [emotionName hasPrefix:@"w_"]) {
        imagePath = [NSString stringWithFormat:@"EmotionIcons/default/%@",emotion.png]; // 默认表情路径
    } else if ([emotionName hasPrefix:@"lxh_"]) {
        imagePath = [NSString stringWithFormat:@"EmotionIcons/lxh/%@",emotion.png]; // 浪小花表情路径
    }

    // 设置当前attachment的image
    self.image = [UIImage imageNamed:imagePath];
}


@end

最终效果：

待发送的文本为：