wehub-resource-sync
74 lines
3.3 KiB
Objective-C
74 lines
3.3 KiB
Objective-C
//
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// NSString+Message.m
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// TLChat
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//
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// Created by 李伯坤 on 16/3/15.
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// Copyright © 2016年 李伯坤. All rights reserved.
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//
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#import "NSString+Message.h"
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#import "TLExpressionHelper.h"
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@implementation NSString (Message)
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- (NSAttributedString *)toMessageString;
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{
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//1、创建一个可变的属性字符串
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NSMutableAttributedString *attributeString = [[NSMutableAttributedString alloc] initWithString:self];
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[attributeString addAttribute:NSFontAttributeName value:[UIFont fontTextMessageText] range:NSMakeRange(0, self.length)];
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//2、通过正则表达式来匹配字符串
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NSString *regex_emoji = @"\\[[a-zA-Z0-9\\/\\u4e00-\\u9fa5]+\\]"; //匹配表情
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NSError *error = nil;
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NSRegularExpression *re = [NSRegularExpression regularExpressionWithPattern:regex_emoji options:NSRegularExpressionCaseInsensitive error:&error];
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if (!re) {
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NSLog(@"[NSString toMessageString]: %@", [error localizedDescription]);
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return attributeString;
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}
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NSArray *resultArray = [re matchesInString:self options:0 range:NSMakeRange(0, self.length)];
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//3、获取所有的表情以及位置
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//用来存放字典，字典中存储的是图片和图片对应的位置
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NSMutableArray *imageArray = [NSMutableArray arrayWithCapacity:resultArray.count];
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//根据匹配范围来用图片进行相应的替换
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for(NSTextCheckingResult *match in resultArray) {
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//获取数组元素中得到range
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NSRange range = [match range];
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//获取原字符串中对应的值
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NSString *subStr = [self substringWithRange:range];
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TLExpressionGroupModel *group = [[TLExpressionHelper sharedHelper] defaultFaceGroup];
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for (TLExpressionModel *emoji in group.data) {
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if ([emoji.name isEqualToString:subStr]) {
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//face[i][@"png"]就是我们要加载的图片
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//新建文字附件来存放我们的图片,iOS7才新加的对象
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NSTextAttachment *textAttachment = [[NSTextAttachment alloc] init];
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//给附件添加图片
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textAttachment.image = [UIImage imageNamed:emoji.name];
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//调整一下图片的位置,如果你的图片偏上或者偏下，调整一下bounds的y值即可
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textAttachment.bounds = CGRectMake(0, -4, 20, 20);
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//把附件转换成可变字符串，用于替换掉源字符串中的表情文字
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NSAttributedString *imageStr = [NSAttributedString attributedStringWithAttachment:textAttachment];
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//把图片和图片对应的位置存入字典中
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NSMutableDictionary *imageDic = [NSMutableDictionary dictionaryWithCapacity:2];
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[imageDic setObject:imageStr forKey:@"image"];
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[imageDic setObject:[NSValue valueWithRange:range] forKey:@"range"];
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//把字典存入数组中
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[imageArray addObject:imageDic];
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}
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}
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}
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//4、从后往前替换，否则会引起位置问题
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for (int i = (int)imageArray.count -1; i >= 0; i--) {
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NSRange range;
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[imageArray[i][@"range"] getValue:&range];
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//进行替换
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[attributeString replaceCharactersInRange:range withAttributedString:imageArray[i][@"image"]];
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}
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return attributeString;
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}
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@end
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