Phznxcbxkayfa
New Member
I'm creating a xml parser class with TBXML. I'd like the class to load an xml doc, traverse through it, and return an array of strings to populate a table. This should take place in a background thread so it does block the UI. I'd like to add a completion block so the table's data source array is set when the xml parsing is complete. How do I implement the completion block? Here's what I have so far
arser.m\[code\]- (NSMutableArray *)loadObjects{ // Create a success block to be called when the asyn request completes TBXMLSuccessBlock successBlock = ^(TBXML *tbxmlDocument) { NSLog(@"PROCESSING ASYNC CALLBACK"); // If TBXML found a root node, process element and iterate all children if (tbxmlDocument.rootXMLElement) [self traverseElement:tbxmlDocument.rootXMLElement]; }; // Create a failure block that gets called if something goes wrong TBXMLFailureBlock failureBlock = ^(TBXML *tbxmlDocument, NSError * error) { NSLog(@"Error! %@ %@", [error localizedDescription], [error userInfo]); }; // Initialize TBXML with the URL of an XML doc. TBXML asynchronously loads and parses the file. tbxml = [[TBXML alloc] initWithURL:[NSURL URLWithString
"XML_DOC_URL"] success:successBlock failure:failureBlock]; return self.array;}- (void)traverseElement
TBXMLElement *)element{ do { // if the element has child elements, process them if (element->firstChild) [self traverseElement:element->firstChild]; if ([[TBXML elementName:element] isEqualToString"item"]) { TBXMLElement *title = [TBXML childElementNamed"title" parentElement:element]; NSString *titleString = [TBXML textForElement:title]; [self.array addObject:titleString]; }; // Obtain next sibling element } while ((element = element->nextSibling));}\[/code\]TableViewController.m\[code\]- (void)viewDidLoad{ [super viewDidLoad]; Parser *parser = [[Parser alloc] init]; self.products = [parser loadObjects]; }\[/code\]
arser.m\[code\]- (NSMutableArray *)loadObjects{ // Create a success block to be called when the asyn request completes TBXMLSuccessBlock successBlock = ^(TBXML *tbxmlDocument) { NSLog(@"PROCESSING ASYNC CALLBACK"); // If TBXML found a root node, process element and iterate all children if (tbxmlDocument.rootXMLElement) [self traverseElement:tbxmlDocument.rootXMLElement]; }; // Create a failure block that gets called if something goes wrong TBXMLFailureBlock failureBlock = ^(TBXML *tbxmlDocument, NSError * error) { NSLog(@"Error! %@ %@", [error localizedDescription], [error userInfo]); }; // Initialize TBXML with the URL of an XML doc. TBXML asynchronously loads and parses the file. tbxml = [[TBXML alloc] initWithURL:[NSURL URLWithString"XML_DOC_URL"] success:successBlock failure:failureBlock]; return self.array;}- (void)traverseElementTBXMLElement *)element{ do { // if the element has child elements, process them if (element->firstChild) [self traverseElement:element->firstChild]; if ([[TBXML elementName:element] isEqualToString"item"]) { TBXMLElement *title = [TBXML childElementNamed"title" parentElement:element]; NSString *titleString = [TBXML textForElement:title]; [self.array addObject:titleString]; }; // Obtain next sibling element } while ((element = element->nextSibling));}\[/code\]TableViewController.m\[code\]- (void)viewDidLoad{ [super viewDidLoad]; Parser *parser = [[Parser alloc] init]; self.products = [parser loadObjects]; }\[/code\]