Object-c 遍历网页获取网页中<img>标签中的图片url

-(NSArray*)getImgTags:(NSString *)htmlText
{
    if (htmlText == nil) {
        return nil;
    }

    
    NSError *error;
    NSString *regulaStr = @"<img[^>]+src\\s*=\\s*[‘\"]([^‘\"]+)[‘\"][^>]*>";
    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:regulaStr
                                                                           options:NSRegularExpressionCaseInsensitive
                                                                             error:&error];
    NSArray *arrayOfAllMatches = [regex matchesInString:imageText options:0 range:NSMakeRange(0, [htmlText length])];

    return arrayOfAllMatches;
}

-(NSString *)getImageUrl:(NSString *)imgTagStr{  // 提取url
    
    NSData * data = [imgTagStr dataUsingEncoding:NSUTF8StringEncoding];
    TFHpple *doc = [[TFHpple alloc] initWithXMLData:data];
    
    TFHppleElement *e = [doc peekAtSearchWithXPathQuery:@"//img"];
    
    return [self encodeStringFromString:[e objectForKey:@"src"]];
}