iOS - 搜索关键字在结果中高亮显示

1. 支持搜索的内容拆分为单个字符串与整体的数据进行比较

- (NSMutableAttributedString *)stringWithHighLightSubstring:(NSString *)totalString substring:(NSString *)substring{
    NSMutableAttributedString * attributedString = [[NSMutableAttributedString alloc] initWithString:totalString];
    NSString * copyTotalString = totalString;
    NSMutableString * replaceString = [NSMutableString stringWithString:@" "];
    for (int i = 0; i < substring.length; i ++) {
        NSString *singleString = [substring substringWithRange:NSMakeRange(i, 1)];
        while ([copyTotalString rangeOfString:singleString].location != NSNotFound) {
             NSRange range = [copyTotalString rangeOfString:singleString];
             //颜色如果统一的话可写在这里，如果颜色根据内容在改变，可把颜色作为参数，调用方法的时候传入
             [attributedString addAttribute:NSForegroundColorAttributeName value:[UIColor orangeColor] range:range];
             copyTotalString = [copyTotalString stringByReplacingCharactersInRange:range withString:replaceString];
         }
    }
    return attributedString;
}

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2. 搜索的内容不进行拆分，直接匹配有则显示

- (NSMutableAttributedString *)stringWithHighLightSubstring:(NSString *)totalString substring:(NSString *)substring{
    NSMutableAttributedString * attributedString = [[NSMutableAttributedString alloc] initWithString:totalString];
    NSString * copyTotalString = totalString;
    NSMutableString * replaceString = [NSMutableString stringWithString:@" "];
    for (int i = 0; i < substring.length; i ++) {
        [replaceString appendString:@" "];
    }
    while ([copyTotalString rangeOfString:substring].location != NSNotFound) {
         NSRange range = [copyTotalString rangeOfString:substring];
         [attributedString addAttribute:NSForegroundColorAttributeName value:[UIColor orangeColor] range:range];
         copyTotalString = [copyTotalString stringByReplacingCharactersInRange:range withString:replaceString];
     }
    return attributedString;
}

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