Can't get NSXMLParser data into textfield, menu item, or label

Question

I am using the code below to parse an online XML file. When I run the application, my textfields are empty. How do I extract the strings from the NSXMLParser and put them into IBOutlets such as textfields, menu items, or labels?

interface file:

#import <Foundation/Foundation.h>

@interface XMLCurrent : NSObject <NSXMLParserDelegate> {
    IBOutlet NSTextField *location;
    IBOutlet NSTextField *condition;
    IBOutlet NSTextField *degreesF;

    NSMutableString *xmlLocation;
    NSMutableString *xmlWeather;
    NSMutableString *xmlTempF;
}

- (void)fetchCurrentWeather:(id)sender;

@end

implementation file:

#import "XMLCurrent.h"

@implementation XMLCurrent

- (void)fetchCurrentWeather:(id)sender {

    NSURL *xmlURL = [NSURL URLWithString:@"http://www.weather.gov/xml/current_obs/KCLT.xml"];

    NSXMLParser *parser = [[NSXMLParser alloc] initWithContentsOfURL:xmlURL];
    [parser setDelegate:self];
    [parser parse];
}

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict {

    if ([elementName isEqual:@"location"]) {
        xmlLocation = [[NSMutableString alloc] init];
    }

    if ([elementName isEqual:@"weather"]) {
        xmlWeather = [[NSMutableString alloc] init];
    }

    if ([elementName isEqual:@"temp_f"]) {
        xmlTempF = [[NSMutableString alloc] init];
    }
}

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string {

    [xmlLocation appendString:string];
    [xmlWeather appendString:string];
    [xmlTempF appendString:string];
}

- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName {

    if ([elementName isEqual:@"location"]) {
        [location setStringValue:xmlLocation];
    }

    if ([elementName isEqual:@"weather"]) {
        [condition setStringValue:xmlWeather];
    }

    if ([elementName isEqual:@"temp_f"]) {
        [degreesF setStringValue:xmlTempF];
    }
}

@end

Answer 1

I think there could be two reasons of your problem:

1. You're parsing XML before the viewDidLoad was called, and that's why all your outlets are nil

2. You didn't connect them in Interface Builder.