How to create a rotating circle?

Question

I'm trying to make a simple "rotating gear animation." Basically, I want to put a circle on the screen at a certain position, and give this circle an image of gear (or just make the image rotating without creating a circle at first). Also, the gear should keep rotating. How can I achieve that?

I'm beginner to ios development. If anyone can provide a simple sample code, I will really appreciate that!

You forgot to post the code you currently have. – Aug 03 '13 at 10:16 — , Aug 03 '13 at 10:16
https://github.com/jonasschnelli/UIView-i7Rotate360 – Wain Aug 03 '13 at 10:16 — Wain, Aug 03 '13 at 10:16
Thanks! I'll have a look at the code – user2633210 Aug 03 '13 at 10:19 — user2633210, Aug 03 '13 at 10:19

score 0 · Accepted Answer · edited May 23 '17 at 12:28

You have to actually rotate a UIImageView infinitely.

Firstly #import <QuartzCore/QuartzCore.h>

  - (void) runSpinAnimationOnView:(UIView*)view duration:(CGFloat)duration rotations:    (CGFloat)rotations repeat:(float)repeat;
{
    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 = repeat;

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

Assume that you have a UIImageView and assign an image on it and named ImgView. On viewDidLoad, add your code as below:

[UIView beginAnimations:nil context:nil];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationCurve:UIViewAnimationCurveEaseIn];
[UIView setAnimationRepeatCount:MAXFLOAT];
ImgView.transform = CGAffineTransformMakeRotation(M_PI);
[UIView commitAnimations];

From the links :-

UIView Infinite 360 degree rotation animation?

Infinite rotating image background UIImageView

wouldn't it be better to use block-based animations as the Apple recommends for iOS4+? now, we are almost iOS7... — holex, Aug 03 '13 at 14:05

How to create a rotating circle?

1 Answers1