Rotate UIImageView 1 degree

Question

I have this code for rotate image view:

func rotateAgain(){
    UIView.animateWithDuration(1.0,
        delay: 0.0,
        options: .CurveLinear,
        animations: {self.imageView.transform = CGAffineTransformRotate(self.imageView.transform, 1.degreesToRadians)},
        completion: {finished in if self.rotating { self.rotateOnce() }})
}

What is wrong in the code?

score 0 · Answer 1 · answered Apr 23 '15 at 09:49

0

The second argument for the CGAffineTransformRotate is for the angle, but it is in radians, if you want to transform radians to degrees, you have to multiply the angle in degrees with 0.0174532925

Example for rotating for 240 degrees:

CGAffineTransformRotate(self.imageView.transform, 240 * 0.0174532925)

answered Apr 23 '15 at 09:49

Dejan Skledar

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Why can´t i only use 240? What is "0.0174532925"?.. And for 360 degrees is: self.imageView.transform, 360 * 0.0174532925? – Torre Yan Apr 23 '15 at 09:55
Yes, exactly, radians and degrees are different units, you should read a bit about that... – Dejan Skledar Apr 23 '15 at 09:58
Do i really need both the rotate once, and rotate again? How can i do this by using only 1 function to rotate it? – Torre Yan Apr 23 '15 at 10:01
@LeonardoSavioDabus How do i rotate it 1 degree only? – Torre Yan Apr 23 '15 at 10:10
If using his extension, then 1.degreesToRadian – Dejan Skledar Apr 23 '15 at 10:11
Like: animations: {self.imageView.transform = 1.degreesToRadian}, ? – Torre Yan Apr 23 '15 at 10:15
No, like: animations: {self.imageView.transform = CGAffineTransformRotate(self.imageView.transform, 1.degreesToRadians)}, – Dejan Skledar Apr 23 '15 at 10:16
@DejanSkledar Look at my question. I have updated it. The code does not work. – Torre Yan Apr 23 '15 at 10:27
Throws an error ? 1 degree is probally to small to notice. – Dejan Skledar Apr 23 '15 at 10:34
@DejanSkledar To small? My plan is to make the image view rotate 360 degrees 10 times, and then rotate from a random degree between 1 and 360 degrees. – Torre Yan Apr 23 '15 at 10:39
@DejanSkledar - Can you post a new answer with a full code i can try, mine is just messed up with loads of errors now. – Torre Yan Apr 23 '15 at 12:41
@DejanSkledar i have code: self.imageView.transform = CGAffineTransformRotate(self.imageView.transform, 1 * 0.0174532925) that will rotate 1 degree. But i want to make lucky wheel, so it has to rotate more then 1 degree – Torre Yan Apr 23 '15 at 15:35
Then you have to use the arc4rand() function, to generate a random degree. – Dejan Skledar May 06 '15 at 20:00

Rotate UIImageView 1 degree

1 Answers1