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POiOS: a Complete 360 Degree-Rotation Using Block, Not CABasicAnimation
 

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  1. POiOS: a Complete 360 Degree-Rotation Using Block, Not CABasicAnimation
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    <p>It should be something really simple, but I have not been successful in getting this to work using blocks. There are questions and answers to this, but all of them I found are solved by the use of <code>CABasicAnimation</code> and not by <code>UIView</code> Block-Based Animation, which is what I am after.</p> <p>The following code doesn't work (Block-Based), no animation:</p> <pre><code>CGAffineTransform spin = CGAffineTransformRotate(spiningView.transform, DEGREES_RADIANS(360)); CATransform3D identity = CATransform3DIdentity; CATransform3D spin2 = CATransform3DRotate(identity, DEGREES_RADIANS(360), 0.0f, 0.0f, 1.0f); [UIView animateWithDuration:3.0f delay:0.0f options:UIViewAnimationOptionCurveLinear animations:^ { spiningView.transform = spin; //spiningView.layer.transform = spin2; //Have also tried the above, doesn't work either. } completion:^(BOOL finished) { spiningView.transform = spin; //spiningView.layer.transform = spin2; }]; </code></pre> <p>From my understanding, when every time we use Block-Based, no animation would occur, when <code>UIViewAnimation</code> Block "sees" that the begin value is the same as the final value. Fair enough, setting it to move to 360 degree would mean that the object stays where it is. But it has to be a way to use Block-Based Animation to make this animate, because the following <code>CABasicAnimation</code> would work flawlessly:</p> <pre><code>CABasicAnimation* rotationAnimation; rotationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"]; rotationAnimation.fromValue = [NSNumber numberWithFloat:0.0f]; rotationAnimation.toValue = [NSNumber numberWithFloat: M_PI * 2.0f]; rotationAnimation.duration = 3.0f; rotationAnimation.cumulative = YES; rotationAnimation.repeatCount = 1; [spiningView.layer addAnimation:rotationAnimation forKey:@"rotationAnimation"]; </code></pre> <p>In Addition, the following Block-Based works, but there is a stop in between animations (first it rotates to 180 degrees, then therefrom to make another 180 degrees to complete the rotation), which is not what I am after:</p> <pre><code>[UIView animateWithDuration:3.0f delay:0.0f options:UIViewAnimationOptionCurveLinear animations:^ { spiningView.transform = CGAffineTransformRotate(spiningView.transform, DEGREES_RADIANS(180));; } completion:^(BOOL finished) { [UIView animateWithDuration:3.0f delay:0.0f options:UIViewAnimationOptionCurveLinear animations:^ { spiningView.transform = CGAffineTransformRotate(spiningView.transform, DEGREES_RADIANS(360)); } completion:^(BOOL finished) { }]; }]; </code></pre> <p>I know I could save a lot of time and just surrender myself to using <code>CABasicAnimation</code> and be done with it, but I would like to <strong>know</strong> why one works and the other doesn't in this case (making a 360 degree rotation). I hope that you can give me a detailed explanation regarding this between the 2 in this case and some code (Block-Based) that can carry out a complete 360 degree rotation.</p> <p>Thanks in advance. </p>
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    1. COShouldn't the second transform (in the block-based solution) use 180 degrees, since it's a transformation over the current transform property at that point (which is already 180 degrees)? Also have you tried just using `CGAffineTransformMakeRotation(M_PI*2)` in a single `animations` block?
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    2. CO@matehat Within the second animation block in the second block-based solution is in fact 360 degrees, if I used 180 degrees, it would just rotate to 180 degrees (by the first animation block) and stops there. It also seems strange to me that I have to set 360 degrees within the second nested-block instead of 180.
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