Mix CABasicAnimation with CGAffineTransform animation

Question

I need to rotate an UIImageView continuously. To do this I found this code :

if ([self.image.layer animationForKey:@"SpinAnimation"] == nil) {

        CABasicAnimation* animation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
        animation.fromValue = [NSNumber numberWithFloat:0.0f];
        animation.toValue = [NSNumber numberWithFloat: 2 * M_PI];
        animation.duration = 90.0f;
        animation.repeatCount = INFINITY;
        [self.image.layer addAnimation:animation forKey:@"SpinAnimation"];
    }

Then, I need to make a transform translation on the image view, animating it. If I do this :

CGAffineTransform transform = self.image.transform;
transform = CGAffineTransformTranslate(transform, 0, 350);
[UIView animateWithDuration:1.0f animations:^{

        [self.view layoutIfNeeded];
        self.image.transform = transform;
    } completion:^(BOOL finished) {

        self.isMiddleViewOpened = YES;
    }];

When the animation is performed, the image float all around the view before arriving to the end point of the translation. Thanks ☺️

EDIT I have issue because in my second transform I edit only the y value, but the image doesn't move only on y axis. If you try this code, you'll see the issue

Answer 1

There is no way to mix both animations, you can use Core animation to do all your animation stuff.

I use this in my splash screen to rotate four image blocks and combine them into one in the end.

The animation would like this:

Code for one image block: Top left block , I call it 00 block

- (void)addSplashScreenAnimationWithCompletion:(void (^)(BOOL finished))completionBlock
{
    [self addSplashScreenAnimationWithBeginTime:0 andFillMode:kCAFillModeBoth andRemoveOnCompletion:NO completion:completionBlock];
}

- (void)addSplashScreenAnimationWithBeginTime:(CFTimeInterval)beginTime andFillMode:(NSString *)fillMode andRemoveOnCompletion:(BOOL)removedOnCompletion completion:(void (^)(BOOL finished))completionBlock
{
    CAMediaTimingFunction *linearTiming = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];

    if (completionBlock)
    {
        CABasicAnimation *representativeAnimation = [CABasicAnimation animationWithKeyPath:@"not.a.real.key"];
        representativeAnimation.duration = 8.500; //your duration
        representativeAnimation.delegate = self;
        [self.layer addAnimation:representativeAnimation forKey:@"SplashScreen"];

    }

    CAKeyframeAnimation *_00RotationAnimation = [CAKeyframeAnimation animationWithKeyPath:@"transform.rotation.z"];
    _00RotationAnimation.duration = 8.500;
    _00RotationAnimation.values = @[@(0.000), @(18.829), @(18.829)];
    _00RotationAnimation.keyTimes = @[@(0.000), @(0.353), @(1.000)];
    _00RotationAnimation.timingFunctions = @[linearTiming, linearTiming];
    _00RotationAnimation.beginTime = beginTime;
    _00RotationAnimation.fillMode = fillMode;
    _00RotationAnimation.removedOnCompletion = removedOnCompletion;


    CAKeyframeAnimation *_00OpacityAnimation = [CAKeyframeAnimation animationWithKeyPath:@"opacity"];
    _00OpacityAnimation.duration = 8.500;
    _00OpacityAnimation.values = @[@(0.000), @(0.497), @(0.553), @(0.759), @(0.921), @(1.000), @(0.642), @(0.341), @(0.000), @(0.000)];
    _00OpacityAnimation.keyTimes = @[@(0.000), @(0.059), @(0.118), @(0.176), @(0.235), @(0.353), @(0.471), @(0.647), @(0.765), @(1.000)];
    _00OpacityAnimation.timingFunctions = @[linearTiming, linearTiming, linearTiming, linearTiming, linearTiming, linearTiming, linearTiming, linearTiming, linearTiming];
    _00OpacityAnimation.beginTime = beginTime;
    _00OpacityAnimation.fillMode = fillMode;
    _00OpacityAnimation.removedOnCompletion = removedOnCompletion;


    CAKeyframeAnimation *_00ScaleXAnimation = [CAKeyframeAnimation animationWithKeyPath:@"transform.scale.x"];
    _00ScaleXAnimation.duration = 8.500;
    _00ScaleXAnimation.values = @[@(0.600), @(0.600), @(1.187), @(1.187)];
    _00ScaleXAnimation.keyTimes = @[@(0.000), @(0.353), @(0.765), @(1.000)];
    _00ScaleXAnimation.timingFunctions = @[linearTiming, linearTiming, linearTiming];
    _00ScaleXAnimation.beginTime = beginTime;
    _00ScaleXAnimation.fillMode = fillMode;
    _00ScaleXAnimation.removedOnCompletion = removedOnCompletion;

    CAKeyframeAnimation *_00ScaleYAnimation = [CAKeyframeAnimation animationWithKeyPath:@"transform.scale.y"];
    _00ScaleYAnimation.duration = 8.500;
    _00ScaleYAnimation.values = @[@(0.688), @(0.688), @(1.359), @(1.359)];
    _00ScaleYAnimation.keyTimes = @[@(0.000), @(0.353), @(0.765), @(1.000)];
    _00ScaleYAnimation.timingFunctions = @[linearTiming, linearTiming, linearTiming];
    _00ScaleYAnimation.beginTime = beginTime;
    _00ScaleYAnimation.fillMode = fillMode;
    _00ScaleYAnimation.removedOnCompletion = removedOnCompletion;


    CAKeyframeAnimation *_00TranslationXAnimation = [CAKeyframeAnimation animationWithKeyPath:@"transform.translation.x"];
    _00TranslationXAnimation.duration = 8.500;
    _00TranslationXAnimation.values = @[@(0.000), @(107.423), @(211.936), @(211.936)];
    _00TranslationXAnimation.keyTimes = @[@(0.000), @(0.353), @(0.765), @(1.000)];
    _00TranslationXAnimation.timingFunctions = @[linearTiming, linearTiming, linearTiming];
    _00TranslationXAnimation.beginTime = beginTime;
    _00TranslationXAnimation.fillMode = fillMode;
    _00TranslationXAnimation.removedOnCompletion = removedOnCompletion;


    CAKeyframeAnimation *_00TranslationYAnimation = [CAKeyframeAnimation animationWithKeyPath:@"transform.translation.y"];
    _00TranslationYAnimation.duration = 8.500;
    _00TranslationYAnimation.values = @[@(0.000), @(390.498), @(476.237), @(476.237)];
    _00TranslationYAnimation.keyTimes = @[@(0.000), @(0.353), @(0.765), @(1.000)];
    _00TranslationYAnimation.timingFunctions = @[linearTiming, linearTiming, linearTiming];
    _00TranslationYAnimation.beginTime = beginTime;
    _00TranslationYAnimation.fillMode = fillMode;
    _00TranslationYAnimation.removedOnCompletion = removedOnCompletion;


}

The above method contains series of animations like rotating, opacity changin,,scaling along x and y axis,translating along x and y axis. You need to subclass the UIImageView or UIView and put the animation in there.

You can call the above method like:

 //Here _splashView can be UIView or UIImageView

[_splashView addSplashScreenAnimationWithCompletion:^(BOOL finished) {

      //Do your stuff after animation is completed
}];

You can use repeatCount for CAKeyFrameAnimation too, and you should give HUGE_VALF to get the infinity time rotation.