How to parse Multiple .xml files in iphone? - iphone

Question

Its my first experience with xmls so please don't be harsh on me if my question is low quality. I am working on app where I retrieve all data using xml files from server.
Before posting question here I read some Tutorials about xml file parsing. But when I start to implement it in my app, then I am totally confused at the point when I am trying to parse the second Xml file and so on.
Now I want to explain my app flow using some screenshot so that it become easy for everyone that what I want.
First view
Second view
Third view
Now when I click in any row in first view it goes to second view and show all related data in second view and when I click any item in Second view it goes to the third view and show detail information about that particular item.
After explanation of app flow, now I show my code what I tried so far. Following a tutorial I just simply drag classes (XMLParser, Book) to my app for testing purpose.
Code:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
NSURL *url = [[NSURL alloc] initWithString:#"Firstviewxmlurl"];
NSXMLParser *xmlParser = [[NSXMLParser alloc] initWithContentsOfURL:url];
XMLParser *parser = [[XMLParser alloc] initXMLParser];
[xmlParser setDelegate:parser];
BOOL success = [xmlParser parse];
if(success)
NSLog(#"No Errors");
else
NSLog(#"Error Error Error!!!");
}
Now my XMLParser.m code is
- (XMLParser *) initXMLParser {
[super init];
appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
return self;
}
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName
namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qualifiedName
attributes:(NSDictionary *)attributeDict {
if([elementName isEqualToString:#"Collections"]) {
//Initialize the array.
appDelegate.books = [[NSMutableArray alloc] init];
}
else if([elementName isEqualToString:#"Collection"]) {
//Initialize the book.
aBook = [[Book alloc] init];
//Extract the attribute here.
aBook.bookID = [[attributeDict objectForKey:#"id"] integerValue];
NSLog(#"Reading id value :%i", aBook.bookID);
}
NSLog(#"Processing Element: %#", elementName);
}
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string {
if(!currentElementValue)
currentElementValue = [[NSMutableString alloc] initWithString:string];
else
[currentElementValue appendString:string];
NSLog(#"Processing Value: %#", currentElementValue);
}
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName
namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName {
if([elementName isEqualToString:#"Collections"])
return;
if([elementName isEqualToString:#"Collection"]) {
[appDelegate.books addObject:aBook];
[aBook release];
aBook = nil;
}
else
[aBook setValue:currentElementValue forKey:elementName];
[currentElementValue release];
currentElementValue = nil;
}
Finaly my First view Class code is
#pragma mark Table Methods
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
//return [tblViewData count];
return [appDelegate.books count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"SimpleTableIdentifier";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil)
{
cell=[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:CellIdentifier];
cell.selectionStyle=UITableViewCellSelectionStyleGray;
cell.accessoryType=UITableViewCellAccessoryDisclosureIndicator;
}
//cell.textLabel.text=[[tblViewData objectAtIndex:indexPath.row]
// stringByReplacingOccurrencesOfString:#"*" withString:#""];
Book *aBook = [appDelegate.books objectAtIndex:indexPath.row];
cell.textLabel.text = aBook.title;
if([deviceType isEqualToString:#"ipad"])
{
[cell.textLabel setFont:[UIFont fontWithName:#"Helvetica-Bold" size:20]];
}
//cell.textLabel.font=[UIFont fontWithName:#"Walkway_SemiBold" size:16];
return cell;
}
After implementation of all the above Code i got the result in form of this Now at this point i confuse how can i pass my Second view xml file url and then third view url.my xml files are in this format
First xml file
<?xml version="1.0" encoding="UTF-8"?>
<Collections> <Collection id="5"><title>Allegroo</title> </Collection>
Second xml file
<?xml version="1.0" encoding="UTF-8"?>
<Collection id="5"><colletciontitle>Allegroo</colletciontitle> <weaveimage>"imageurl" </weaveimage><Rug id="48"><Rugthumb>"firstimageurl"</Rugthumb><RugSku>AL-637</RugSku></Rug><Rug id="51"><Rugthumb>"Secondimageurl"</Rugthumb><RugSku>AL-641</RugSku></Rug>
Third xml file
<?xml version="1.0" encoding="UTF-8"?>
<Rug id="47"><Rugmainimage>"imageurl"</Rugmainimage> <Rugtitle>AL-636 Aged Indigo / Vintage Beige</Rugtitle> <Rugdiscription>Hand Knotted
Distressed Wool Pile / Cotton Foundation </Rugdiscription><Availablesizes><Size>10x14</Size><Size>12x15</Size><Size>2x3</Size><Size>3x5</Size><Size>4x6</Size><Size>6x9</Size><Size>8x10</Size><Size>9x12</Size><Runner>2'6"x10'</Runner><Runner>2'6"x12'</Runner><Runner>2'6"x8'</Runner></Availablesizes></Rug>
Any help in the form of link or sample code releated to my issue and suggestion will be highly appriated.Thanks

Answer 1

Hmm, So Defining long story short, you want to parse multiple urls in sequence ?
So here is the answer,
Use a variable / identifier in appDelegate that tells you which xml is being parsed.
Use your xml parser as delegate class object
Use delegate method to swich to next xml parsing
- (void)parserDidEndDocument:(NSXMLParser *)parser {
// Change URL accordingly
NSURL *url = [[NSURL alloc] initWithString:#"Firstviewxmlurl"];
NSXMLParser *xmlParser = [[NSXMLParser alloc] initWithContentsOfURL:url];
XMLParser *parser = [[XMLParser alloc] initXMLParser];
[xmlParser setDelegate:parser];
BOOL success = [xmlParser parse];
}

Answer 2

I have added some of the code to make you understand. Try to implement according to your condition. Below code is just to refer as i havn't made all the changes u need to understand first and then implement accordingly
//int i = 0; // in AppDelegate
Code:
//Or ViewDidLoad Method
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
int = 1; //For First View
NSURL *url = [[NSURL alloc] initWithString:#"Firstviewxmlurl"];
NSXMLParser *xmlParser = [[NSXMLParser alloc] initWithContentsOfURL:url];
XMLParser *parser = [[XMLParser alloc] initXMLParser];
[xmlParser setDelegate:parser];
BOOL success = [xmlParser parse];
if(success)
NSLog(#"No Errors");
else
NSLog(#"Error Error Error!!!");
}
XMLParser.m
- (XMLParser *) initXMLParser
{
[super init];
appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
return self;
}
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName
namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qualifiedName
attributes:(NSDictionary *)attributeDict {
if([elementName isEqualToString:#"Collections"])
{
//Initialize the array.
if (int == 1)
appDelegate.books = [[NSMutableArray alloc] init];
else if (int == 2)
appDelegate.secondArray = [[NSMutableArray alloc] init];
else if (int == 3)
appDelegate.thirdArray = [[NSMutableArray alloc] init];
}
else if([elementName isEqualToString:#"Collection"])
{
if (i == 1)
{
//Initialize the book.
aBook = [[Book alloc] init];
//Extract the attribute here.
aBook.bookID = [[attributeDict objectForKey:#"id"] integerValue];
NSLog(#"Reading id value :%i", aBook.bookID);
}
else if (i == 2)
{
//Second Xml
}
else if (i == 3)
{
//Third Xml
}
}
NSLog(#"Processing Element: %#", elementName);
}
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string {
//Check condition
if(!currentElementValue)
currentElementValue = [[NSMutableString alloc] initWithString:string];
else
[currentElementValue appendString:string];
NSLog(#"Processing Value: %#", currentElementValue);
}
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName
namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName {
//Check COndition
if([elementName isEqualToString:#"Collections"])
return;
if([elementName isEqualToString:#"Collection"]) {
[appDelegate.books addObject:aBook];
[aBook release];
aBook = nil;
}
else
[aBook setValue:currentElementValue forKey:elementName];
[currentElementValue release];
currentElementValue = nil;
}