Question

I want to know why there´s no console output when testing on the iOS simulator by tracing that code in my UIViewController – it only traces by testing on a device.

- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration{
    NSLog(@"willRotateToInterfaceOrientation: ", toInterfaceOrientation);
}

And how do i print out that UIInterfaceOrientation value (type of enum)?
Would be great to get your help on that..Thanks

Answer 1

Where is your format specifier?

UIInterfaceOrientation is a typedef enum, not an object, so you cannot use %@ as the format specifier.

Should look like this:

- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration{
   NSLog(@"willRotateToInterfaceOrientation: %d", toInterfaceOrientation);
}

If you really need this kind of “pretty print” functionality, you can run it through a switch, like this:

NSString *orient;
switch(toInterfaceOrientation) {
   case UIInterfaceOrientationLandscapeRight:
       orient = @"UIInterfaceOrientationLandscapeRight";
       break;
   case UIInterfaceOrientationLandscapeLeft:
       orient = @"UIInterfaceOrientationLandscapeLeft";
       break;
   case UIInterfaceOrientationPortrait:
       orient = @"UIInterfaceOrientationPortrait";
       break;
   case UIInterfaceOrientationPortraitUpsideDown:
       orient = @"UIInterfaceOrientationPortraitUpsideDown";
       break;
   default: 
       orient = @"Invalid orientation";
}
NSLog(@"willRotateToInterfaceOrientation: %@", orient);