【iOS开发】emoji表情的输入思路

1.自定义一个表情包类继承NSTextAttachment

#import <UIKit/UIKit.h>

/** 表情包的自定义类*/
@interface EmojiTextAttach : NSTextAttachment

@property (nonatomic,assign) NSRange  range;

/** 绑定NSTextAttachment所表示的表情和与其对应的标志*/
@property (nonatomic, copy) NSString *emojiTag;

/** 表情名称*/
@property (nonatomic, copy) NSString *emojiName;


@end

2.每个emoji表情其实就是一张图片，并且每张图片都有统一的编号，也就是说一个emoji

3.将emoji的图片赋值给自定义的表情包类image属性，并且将emoji转为富文本

#pragma mark - 选择了emoji表情
-(void)emojiView:(FacialView *)emojiView didSelectEmoji:(NSString *)emoji withEmojiPng:(UIImage *)emojiPng
{
    EmojiTextAttach *emojiAttch = [[EmojiTextAttach alloc] init];
    emojiAttch.image = emojiPng;
    emojiAttch.emojiTag = emoji;
    // 当前插入的富文本
    NSAttributedString *addEmoji = [NSAttributedString attributedStringWithAttachment:emojiAttch];
    
    // 输入框所有的可变富文本
    NSMutableAttributedString *allText = [[NSMutableAttributedString alloc] initWithAttributedString:_textView.attributedText];
      NSLog(@"allText-->%@",allText);
    
    // 将选择的表情插入到输入框
    [allText insertAttributedString:addEmoji atIndex:_textView.selectedRange.location];
    
    [allText addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:18.0] range:NSMakeRange(0, allText.length)];
    
    _textView.attributedText = allText;
    
    NSLog(@"allText-->%@",allText);
    //光标位置
    _textView.selectedRange = NSMakeRange(_textView.selectedRange.location + 1, 0);
    
    //[_textView setText:[_textView.text stringByAppendingString:emoji]];
    
    [self textViewDidChange:_textView];
}

4.发送时将富文本转为对应图片编号的纯文本发送给服务器

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
   
    
    if ([text hasSuffix:@"@"]) {    //输入过程
      
        if ([self.delegate respondsToSelector:@selector(showGroupMemberVC)]) {
            [self.delegate showGroupMemberVC];
        }
    }
    
    if (_chatAuth) {
        if ([_chatAuth isEqual:@"noAuth"]) {
            
            [ErrorMessage showErrorMessage:@"您暂时没有发言权限！" inView:[UIApplication sharedApplication].keyWindow];
            return NO;
        }else if ([_chatAuth isEqual:@"isSaid"]) {
            //[ErrorMessage showErrorMessage:@"您今天已经发过言了，明天再来吧！" inView:[UIApplication sharedApplication].keyWindow];
            //return NO;
        }else{
            
        }
    }
  
    // 得到纯文本发送
    NSString *attrStr = textView.attributedText.getPlainString;

    
    if (![attrStr isEqual:@""]) {
        if ([text isEqual:@"
"]) {
            
            NSString * headerData = [CommonTool removeHeaderOrTrailSpaceWithContent:attrStr];
            
            if ([self messageLengthToolong:headerData]) {
                [ErrorMessage showErrorMessage:@"消息内容过长！" inView:_superView];
                return NO;
            }
            
            if (![headerData isEqual:@""]) {
                if ([self.delegate respondsToSelector:@selector(sendMessage:)]) {
                    [self.delegate sendMessage:headerData];
                }
            }else{
                [ErrorMessage showErrorMessage:@"消息不能为空！" inView:_superView];
            }
            
            textView.text = @"";
            [self recoverInputTextViewFrame:textView];
            
            return NO;
        }
    }
    return YES;
}