iphone - UIOrientation returns 0 or 5 -

i running simple function get's called in multiple areas deal layout on ipad app during orientation changes. looks this:

- (void) getwidthandheightfororientation:(uiinterfaceorientation)orientation {     nslog(@"new orientation: %d",orientation); end 

and call in various places this:

[self getwidthandheightfororientation: [[uidevice currentdevice] orientation]]; 

the function has simple code runs if orientation portrait or landscape. unfortunately wasn't working expected when app started in position 1. 0 result. later if function called in same manner device has never been rotated value of 5. mean? why throw these values?

in short why [[uidevice currentdevice] orientation] ever throw 0 or 5 instead of value between 1 , 4?

update:

because kept finding bugs in code due way orientation handled, wrote definitive post on how handle uidevice or uiinterface orientations: http://www.donttrustthisguy.com/orientating-yourself-in-ios

i recommend using uideviceorientationisvalidinterfaceorientation(orientation)

it tell if valid orientation (valid being either landscape or portrait, not faceup/facedown/unknown). can treat if portrait if unknown.

this how it:

if (uideviceorientationisvalidinterfaceorientation(interfaceorientation) && uiinterfaceorientationislandscape(interfaceorientation)) {     // handle landscape } else {     // handle portrait }