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POconnect XML file to Label (objective-C)
 

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    <p>I have an <code>UIViewController</code> page with one button and one <strong>label</strong> . I added xml parser on my project and everything works (I test it in console), right now I want to connect my XML file to my label to just get one attribute of XML file(for test). My question is how can I connect XML to my label. Would you please give me some hint for implementing this?</p> <p>I'm new to objective-C</p> <p>Here is my code:</p> <p>I just want to see how we can connect xml file to label</p> <pre><code> - (void)viewDidLoad { //appDelegate = (testAppDelegate *)[[UIApplication sharedApplication] delegate]; label.textColor = [UIColor greenColor]; // label.text = aBook.title; //it not working, I don't know what should I write to get one // element of xml file to this label or first element of xml file [super viewDidLoad]; } </code></pre> <p>Here is my xml file</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;&lt;Books&gt; &lt;Book id="1"&gt; &lt;title&gt; Circumference&lt;/title&gt; &lt;author&gt;Nicholas Nicastro&lt;/author&gt; &lt;summary&gt;Eratosthenes and the Ancient Quest to Measure the Globe.&lt;/summary&gt; &lt;/Book&gt; &lt;Book id="2"&gt; &lt;title&gt;Copernicus Secret&lt;/title&gt; &lt;author&gt;Jack Repcheck&lt;/author&gt; &lt;summary&gt;How the scientific revolution began&lt;/summary&gt; &lt;/Book&gt; &lt;Book id="3"&gt; &lt;title&gt;Angels and Demons&lt;/title&gt; &lt;author&gt;Dan Brown&lt;/author&gt; &lt;summary&gt;Robert Langdon is summoned to a Swiss research facility to analyze a cryptic symbol seared into the chest of a murdered physicist.&lt;/summary&gt; &lt;/Book&gt; &lt;Book id="4"&gt; &lt;title&gt;Keep the Aspidistra Flying&lt;/title&gt; &lt;author&gt;George Orwell&lt;/author&gt; &lt;summary&gt;A poignant and ultimately hopeful look at class and society, Keep the Aspidistra Flying pays tribute to the stubborn virtues of ordinary people who keep the aspidistra flying. &lt;/summary&gt; &lt;/Book&gt; </code></pre> <p></p> <p>and if it's needed here is my parser class:</p> <pre><code>- (Presentation1NameXML *) initXMLParser { appDelegate = (testAppDelegate *)[[UIApplication sharedApplication] delegate]; return self; } - (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qualifiedName attributes:(NSDictionary *)attributeDict { if([elementName isEqualToString:@"Books"]) { //Initialize the array. appDelegate.books = [[NSMutableArray alloc] init]; } else if([elementName isEqualToString:@"Book"]) { //Initialize the book. aBook = [[Presentation1Name 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:@"Books"]) return; //There is nothing to do if we encounter the Books element here. //If we encounter the Book element howevere, we want to add the book object to the array // and release the object. if([elementName isEqualToString:@"Book"]) { [appDelegate.books addObject:aBook]; aBook = nil; } else [aBook setValue:currentElementValue forKey:elementName]; currentElementValue = nil; } @end </code></pre> <p><strong>Edit:</strong> </p> <p>when I used </p> <pre><code> NSLog(@"%@", aBook.title); I got NULL </code></pre> <p><strong>Edit</strong></p> <p>in some sample that I saw they have something like this also</p> <pre><code> Book *aBook = [appDelegate.books objectAtIndex:indexPath.row]; </code></pre> <p>since they use it in tableView But I don't have any table what should I write instead of objectAtIndex:indexPath.row];</p>
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    1. COare you sure the [aBook setValue:currentElementValue forKey:elementName]; is working? and where do you read and parse the xml? in another viewController? how do you set the book for the viewController where you have the label?
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    2. CO@jcesar yes it's worekd , I pars xml in another viewController
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    3. COSince you say that everything has worked (by that you mean parsing XML, I suppose) we can cross that off the list. Next, is your application delegate actually accumulating the books? Next, how does your view controller get the `PresentationName` object that you want it to display? I don't see any code in `viewDidLoad` that references a `PresentationName` object a.k.a "book".
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      1. USFluffulousChimp
 

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