Set imageview orientation

Question

Im using UIImageview that moves according to a timer selector. Its center moves a certain x and y axis ammounts. Now I want this image to rotate in time, that means, I need to add a float constant called 'w' which will be the angle that my image will rotate every time the selector runs. I need to know if there is any possible way to access the UIImageView current orientation and modify it.

score 0 · Answer 1 · answered Mar 03 '15 at 13:15

If you need to rotate your UIImageView you can use this

CGAffineTransform transform = CGAffineTransformRotate(imageView.transform, M_PI / 2.0f);
imageView.transform = transform;

use this in your timer method with respect to your current rotation degree.

score 0 · Answer 2 · edited May 23 '17 at 10:09

First of all;

#define degreesToRadians( degrees ) ( ( degrees ) / 180.0 * M_PI )

this will convert from degrees to radians for transform

this is a method that you should call to turn imageview

-(void)rotateImage
{
    yourImageView.transform = CGAffineTransformMakeRotation(atan2(yourImageView.transform.b, yourImageView.transform.a)+degreesToRadians(delta));
    k++;
}

delta is the amount of rotation. as an angle.

atan2(b,a) gets the current rotation of your imageview. for more detailed answer click

Set imageview orientation

2 Answers2