CODEWITHSUNDEEP
iosuiimageviewuianimation
user717452
user717452

Reputation: 111

Rotate iOS Image Clockwise

I am trying to animate my image by having it rotate clockwise, and shrink down. So far, it is only going counter-clockwise. I have tried both positive and negative values for the value/Key path of rotating along Z, but it changed nothing.

[window addSubview:splashView];
    [window bringSubviewToFront:splashView];
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:2.0];

    [UIView setAnimationDelegate:self];
    [UIView setAnimationDidStopSelector:@selector(startupAnimationDone:finished:context:)];
    splashView.frame = CGRectMake(160, 284, 0, 0);
    [splashView.layer setValue:[NSNumber numberWithInt:-360]
                       forKeyPath:@"transform.rotation.z"];

    [UIView commitAnimations];

Upvotes: 0

Views: 3145

Answers (3)

calimarkus
calimarkus

Reputation: 9977

Or just use M_PI directly.

  • M_PI_4 = 45 degrees
  • M_PI_2 = 90 degrees
  • M_PI = 180 degrees
  • M_PI*2 = 360 degrees

You can also set your transform more easily.

// set transform
splashView.layer.transform = CATransform3DMakeRotation(-M_PI*2, 0, 0, 1);

instead of

[splashView.layer setValue:[NSNumber numberWithInt:-360] 
                forKeyPath:@"transform.rotation.z"];

Upvotes: 1

Tricertops
Tricertops

Reputation: 8512

To rotate in specific direction more than 360°use CAKeyframeAnimation. There you can set not only the final value, but also some intermediate values.

// consider this to be pseudo code
keyFrameAnimation.values = @[ 90, 180, 270, 360, 450, 540, ... ];

I don't have any code to show you, but this is defnitely the way to do it.

Upvotes: 1

Mick MacCallum
Mick MacCallum

Reputation: 130193

That's because you're passing degrees to the animation when it wants radians. Here's an example of how to make the conversion.

float degrees = 90.0f;
float radians = degrees * (180.0f / M_PI);

Upvotes: 0

Related Questions