iphone UIImageView rotation

Question

Can anyone tell me how to rotate an image in circular motion

score 28 · Answer 1 · answered Sep 14 '09 at 19:42

You can rotate a view, by some number of radians, regardless of whether it is less than a full rotation or many multiples of a full rotation, without having to split the rotation into pieces. As an example, the following code will spin a view, once per second, for a specified number of seconds. You can easily modify it to spin a view by a certain number of rotations, or by some number of radians.

- (void) runSpinAnimationWithDuration:(CGFloat) duration;
{
    CABasicAnimation* rotationAnimation;
    rotationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
    rotationAnimation.toValue = [NSNumber numberWithFloat: M_PI * 2.0 /* full rotation*/ * rotations * duration ];
    rotationAnimation.duration = duration;
    rotationAnimation.cumulative = YES;
    rotationAnimation.repeatCount = 1.0; 
    rotationAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut];

    [myView.layer addAnimation:rotationAnimation forKey:@"rotationAnimation"];
}

rotations is a const. Replace it with the number of times you want the view to rotate in duration amount of time. — mahboudz, Sep 17 '09 at 11:31

score 3 · Answer 2 · answered May 30 '12 at 23:40

3

based on mahboudz's answer, you can set it to infinitely spin by setting:
rotationAnimation.repeatCount = HUGE_VALF;

answered May 30 '12 at 23:40

kentb

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score 2 · Answer 3 · answered Sep 14 '09 at 12:06

2

If you mean, "How do you make an image follow a circular path?", then the pseudocode would be:

image.x = circleCentre.x + cos(angle) * circleRadius;
image.y = circleCentre.y + sin(angle) * circleRadius;
angle += 5;

answered Sep 14 '09 at 12:06

Sam

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score 1 · Answer 4 · edited May 23 '17 at 12:33

1

This question asks the same thing, although in different words. The answers in that question, as well as in this question should provide a way to animate a UIView (UIImageView is simply a subclass of this) about its center for 360 degrees or more.

edited May 23 '17 at 12:33

Community

1
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answered Sep 14 '09 at 13:35

Brad Larson

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Probably u r confused about rotation and revolution. The above question is about revolution. – Biranchi Apr 30 '10 at 05:28

score 1 · Answer 5 · answered Aug 10 '16 at 08:46

Creating the animation

- (CABasicAnimation *)spinAnimationWithDuration:(CGFloat)duration clockwise:(BOOL)clockwise repeat:(BOOL)repeats
{
    CABasicAnimation *anim = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
    anim.toValue = clockwise ? @(M_PI * 2.0) : @(M_PI * -2.0);
    anim.duration = duration;
    anim.cumulative = YES;
    anim.repeatCount = repeats ? CGFLOAT_MAX : 0;
    return anim;
}

Add it to a view

CABasicAnimation *animation = [self spinAnimationWithDuration:1.0 clockwise:YES repeat:YES];
[self.spinningView.layer addAnimation:animation forKey:@"rotationAnimation"];

How is this answer different from @mahboudz's answer? You will have way cleaner code if most of your functions returns objects instead of just manipulating some objects here and there.

iphone UIImageView rotation

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