Question

h

#import <UIKit/UIKit.h>

@interface LoginViewController : UIViewController <UITextFieldDelegate>

@property (nonatomic, retain) NSDictionary *_data;

@end

m

#import "LoginViewController.h"
#import "XMLReader.h"

@implementation LoginViewController

static NSDictionary *_raceInformation;

@synthesize _data, bibInput, lastNameInput, error;

- (id)initWithCoder:(NSCoder *)aDecoder 
{
    self = [super initWithCoder:aDecoder];
    if (self) {
        NSError *e = [NSError alloc];
        NSString *xml = [NSString stringWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"testhalfmarathon" ofType:@"xml"] encoding:NSUTF8StringEncoding error:&e];

        NSDictionary *asdf = [XMLReader dictionaryForXMLString:xml error:nil];
        self._data = [XMLReader dictionaryForXMLString:xml error:nil];

        //[xml release];
        //[e release];

        // !! BREAKPOINT HERE
    }
    return self;
}

When I hit the breakpoint, the value for self._data is nil. However, the value for asdf is the correct dictionary value I would expect in self._data. What gives?

backstory: I’m a n00b when it comes to MRC as I usually use ARC/GC languages.

Answer 1

What line of code did you put the breakpoint against? If it was just a blank line it will actually break at the previous valid line of code, which may have been before self._data was set.

Try putting NSLog(@”data %@”, self._data); instead of your breakpoint and see what gets logged.

BTW, I see you had [xml release], which you commented out, presumably because it wasn’t working. The reason this line is wrong is that [XMLReader dictionaryForXMLString…] returns an autoreleased object that shouldn’t be released again.

In general, in Objective-C if a method name doesn’t begin with “new”, “alloc” or “copy” then it returns an autoreleased object that you don’t need to release yourself.