IOS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"]];
}