Rotate a UIImageView

[haza100]

Hi,
I am trying to rotate a UIImageView constantly using this code i found, but it doesn't seem to work:

-(void) awakeFromNib {
	angle = 0;
}

- (IBAction) gotoGame {
	[MenuView removeFromSuperview];
	[self addSubview:GameView];
	rotationTimer = [NSTimer scheduledTimerWithTimeInterval:0.01 target:self selector:@selector(rotationFunction:) userInfo:nil repeats:YES];
}

-(void)rotationFunction:(NSTimer *)rotationTimer{
	angle +=0.01;
	if (angle > 6.283) { 
		angle = 0;
	}
	CGAffineTransform transform=CGAffineTransformMakeRotation(angle);
		Laser.transform = transform;
}

The strange thing is that if "angle +=0.01" is changed to "angle +=1" it works, but it sucks because it is not a smooth animation.

Thanks!
Harry.

[haza100]

Any help on getting the animation to run smoothly?
Thanks!
Harry.

[rocotilos]

Hi Harry.

If this is a continuous rotation, you might want to use CAnimation. If not, then there is no other way except to make the interval smaller. (0.01, 0.025, etc) Test in actual device to be sure.

Btw,

rotationTimer = [NSTimer scheduledTimerWithTimeInterval:0.01 target:self selector:@selector(rotationFunction:) userInfo:nil repeats:YES];

the above line indicates userInfo as nil. so you don't really need that parameter of rotationTimer in the method.

-(void)rotationFunction:(NSTimer *)rotationTimer{

Just plain

-(void)rotationFunction {

will work fine. remember to remove the : in @selector() above.

[haza100]

Hi,

Thanks for replying, I have tested it on a ipod touch and it still doesn't work, if i add anything less that 1 to the int "angle" it doesn't work :/

Thanks
Harry.

[SoulRed12]

You can't add non-integers to an int variable It'll just chop off the decimal and add that, which means if you add 0.01 to an int it'll chop off the .01 and just add 0 (i.e. do nothing).

Change "angle" to a float type (which allows decimals) and it'll work.

[haza100]

Thanks so much, ha, i reallllly suck for missing that. thanks for the help

[jjardim]

Originally Posted by haza100

Thanks so much, ha, i reallllly suck for missing that. thanks for the help

I created a helper class last week and open sourced it. Search for mshelper on github. I have image rotation, scale, zoom, play sound etc.

On my website you can see videos of my apps and the movement/ rotation is all done with the methods in the class. Take a look at App Layout video, that's how i do all the animation
JSquared
MacSpots - software written by jay

[SoulRed12]

Originally Posted by haza100

Thanks so much, ha, i reallllly suck for missing that. thanks for the help

Nah, I've done that a dozen times myself. Glad it worked out for you