IPhone / iPad rotation

Question

How to determine the start of rotation and end of rotation on these devices?

EDIT: So, after your answers, how can I determine the beginning and end of a change in orientation.

Answer 1

The following two methods can be implemented in your UIViewController.

To detect the beginning of rotation, implement willRotateToInterfaceOrientation: duration: and to determine the final implant didRotateFromInterfaceOrientation: .

i.e.

- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {
    NSLog(@"I am starting to rotate");
}

- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation {
    NSLog(@"I have finished rotating");
}

Answer 2

You can use UIAccelerometer api for this

EDIT to clarify the question:

UIAccelerometer api. AccelerometerGraph, 3 . , .

Answer 3

You cannot detect a turn on any of these devices. The accelerometer detects only speed changes.

You can get a rough orientation measure from the CLLocationManager class that reports the header. This value is slowly updated, which limits its usefulness.