gistfile1.m

//Start at negative kWiggleAnimationAngle so we animate to positive kWiggleAnimationAngle
view.layer.transform = CATransform3DMakeRotation(-kWiggleAnimationAngle, 0, 0, 1.0);

//Setup a transform that will rotate our view to positive kWiggleAnimationAngle
CATransform3D transform = CATransform3DMakeRotation(kWiggleAnimationAngle, 0, 0, 1.0);

//Setup our animation with the transform
CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"transform"];
animation.toValue = [NSValue valueWithCATransform3D:transform];
animation.repeatCount = HUGE_VALF;
animation.duration = 0.1;
animation.autoreverses = YES;
[view.layer addAnimation:animation forKey:@"wiggle"];