How can I make a custom orientation lock action? - iphone

Question

I would like to make a custom orientation lock button for a reader app of mine, and I was thinking it wouldn't be too bad to whip up, but alas I am the one getting whipped.
To start off I do have this method:
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
return YES;
}
And then I was thinking that I could handle the actual locking in an action method like this:
- (IBAction) screenLock:(id)sender{
if([UIDevice currentDevice].orientation == UIDeviceOrientationPortrait){
[[UIDevice currentDevice] setOrientation:UIInterfaceOrientationPortrait];
}else{
[[UIDevice currentDevice] setOrientation:UIInterfaceOrientationLandscapeRight];
}
}
But alas, this code will not hold sway over the former that instructs the view to rotate...
Am I going about this all wrong? What is a better way to do it? I just want to have local, easy way to have my users lock the orientation of their screen. I guess it would be using a boolean value where they hit a button to lock and then hit again to unlock...
Thoughts?
Thanks!!

Answer 1

shouldAutorotateToInterfaceOrientation ripples up your view hierarchy so your logic needs to be put into your app delegate (or as the most senior ViewController that might return YES). Put a BOOL property in your appDelegate and set it via your lock button (e.g. target pointers/delegates (AppDelegate)) then in your appDelegate do something like this:
#define ROTATION_MASTER_ENABLED 1
//Setting MASTER_ROTATION_LOCK_ENABLED to 0 will stop the device rotating
//Landscape UP>landscape DOWN and Portrait UP>Portrait DOWN,
//This is not generally desired or app store safe, default = 1
-(BOOL)compareOrientation:(UIInterfaceOrientation)interfaceOrientation
{
UIInterfaceOrientation actual = [[UIDevice currentDevice] orientation];
if(UIInterfaceOrientationIsLandscape(interfaceOrientation) && UIInterfaceOrientationIsLandscape(actual))return YES;
else if(UIInterfaceOrientationIsPortrait(interfaceOrientation)&& UIInterfaceOrientationIsPortrait(actual))return YES;
else return NO;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
if(!MASTER_ROTATION_LOCK_ENABLED)return NO;
else if(self.rotationEnabled || [self compareOrientation:interfaceOrientation])return YES;
return NO;//self.rotationEnabled is a BOOL
}