Objective-C categories ans autorotation

Question

Hello everyone,
I'm nut sure if I fully understand the [Reference|http://developer.apple.com/documentation/Cocoa/Conceptual/ObjectiveC /Articles/chapter4_section_2.html#//appleref/doc/uid/TP30001163-CH20-TPXREF139] regarding categories (Yes, I've read it thoroughly).
First of all, this piece of code works fine:
@interface RotatingUIViewController : UIViewController
@end
@implementation RotatingUIViewController : UIViewController
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
return YES; // I want some autorotation for my app
- (void) viewWillAppear:(BOOL)animated {
NSLog(@"%@ will appear",[self className]); // just for testing
@end
// now add a RotatingViewController in the main app delegate
Autorotation does work, and I get "+RotatingUIViewController will appear+" as expected.
Now let's try the same thing with a categorized UIViewController:
@interface UIViewController (foobar)
@end
@implementation UIViewController (foobar)
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
return YES; // I want some autorotation for my app
- (void) viewWillAppear:(BOOL)animated {
NSLog(@"%@ will appear",[self className]); // just for testing
@end
// use UIViewController as usual
Okay, I do get a "+UIViewController will appear+" in the console, but the view does not autorotate.
Any ideas what's wrong?
Regards, Thomas

Answer 1

Actually I was concerned with the object, variable result is pointing to in the method add. By this I mean when the function returns, the reference to the object that result was pointing to will be returned and stored in ans. (Will the reference count) of that object will be affected. And also since the function returned we can no longer access the result hence creating a memory leak