Detect verticality of iPhone

Question

Possible Duplicate:
Get pitch, roll and yaw relative to geographic north on iOS?

Is there a way to detect that iPhone is vertical?

Gyroscope gives us absolute angle relative to a position.

But how can I know if this relative position corresponds to a vertical position?

score 2 · Answer 1 · answered Jul 21 '12 at 17:12

2

if (UIInterfaceOrientationIsPortrait([[UIDevice currentDevice] orientation])) {
    // device is currently in portrait (vertical) orientation
}

answered Jul 21 '12 at 17:12

melsam

As I noted in my answer, be sure to read the class docs for info on ensuring you get a valid value back. – Conrad Shultz Jul 21 '12 at 17:14
I wanna make AR app. Put some annotation to building :) – Jakikiller Jul 21 '12 at 17:26

score 2 · Answer 2 · answered Jul 21 '12 at 17:13

2

If you're not looking for precise angular information, just macro orientation, inspect [[UIDevice currentDevice] orientation].

Be sure to read the class documentation for some important implementation details.

answered Jul 21 '12 at 17:13

Conrad Shultz

^^ this solve my problem http://stackoverflow.com/questions/9313474/get-pitch-roll-and-yaw-relative-to-geographic-north-on-ios – Jakikiller Jul 21 '12 at 17:25

2 Answers2