NSThread Showing SIGABRT - ios

Question

I'm new to IOS I need to implement NSThread in my program, but when it invoked it shows an SIGABRT error. my current code is given below
XMLParser.m
-(void)loadXML
{
categories =[[NSMutableArray alloc]init];
NSString *filepath =[[NSBundle mainBundle]pathForResource:#"cd_catalog" ofType:#"xml"];
NSData *data =[NSData dataWithContentsOfFile:filepath];
parser=[[NSXMLParser alloc]initWithData:data];
parser.delegate =self;
[parser parse];
}
ViewController.m
- (void)viewDidLoad
{
xmlParser =[[XMLParser alloc]init];
NSThread *myThread =[[NSThread alloc]initWithTarget:self selector:#selector(loadXML) object:nil];
[myThread start];
[super viewDidLoad];
}
please tell me what is wrong with my program

Answer 1

Use this code to solve your problem...
ViewController.m
- (void)viewDidLoad
{
NSThread *myThread =[[NSThread alloc]initWithTarget:self selector:#selector(doParsing) object:nil];
[myThread start];
[super viewDidLoad];
}
-(void)doParsing
{
xmlParser =[[XMLParser alloc]init];
[xmlParser loadXML];
}

Answer 2

Instead of creating a NSThread object you can start a thread using
//performSelectorInBackground:withObject: is NSObject's method
[self performSelectorInBackground:#selector(loadXML) withObject:nil];
I didn't find any buggy code but enable NSZombie and seee which object is causing this.

Answer 3

loadXML is not define on ViewController so your thread code should be changed to use an instance of XMLParser instead of self like so:
XMLParser *parser = [[XMLParser alloc] init];
NSThread *thread = [[NSThread alloc] initWithTarget:parser selector:#selector(loadXML) object:nil];
[thread start];

Answer 4

Since Apple introduced GCD, you may solve it without creating any NSThread instance.
dispatch_async(dispatch_get_global_object(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
[self loadXML];
});