Object-c traverse a Web page to get the image URL in the <img> tab of a Web page

Objective:

The project meets a need to traverse all the tags in the page and the URL of the destination image

The first step: write a regular expression that gets the tag, with the following code:

-(nsarray*) Getimgtags: (NSString *) htmltext{if(HTMLText = =Nil) {        returnNil; } nserror*error; NSString*regulastr =@"]+src\\s*=\\s*[' \"]([^'\"]+)['\"][^>]*>"; Nsregularexpression*regex =[Nsregularexpression Regularexpressionwithpattern:regulastr                                                                             Options:nsregularexpressioncaseinsensitive Error:&ERROR]; Nsarray*arrayofallmatches = [Regex matchesinstring:imagetext options:0Range:nsmakerange (0, [htmltext length])]; returnarrayofallmatches;}

Step two: Get the image URL based on the HTML tag element

-(NSString *) Getimageurl: (NSString *) imgtagstr{  //  extract URL        * data = [imgtagstr Datausingencoding:nsutf8stringencoding];     *doc = [[Tfhpple alloc] initwithxmldata:data];         *e = [doc peekatsearchwithxpathquery:@ "//img"];         return [Self encodestringfromstring:[e objectforkey:@ "src"];}

Object-c traverse a Web page to get the image URL in the tab of a Web page