Can I do a half m34 transformation
I want to do a full rotation, but with an image swap half way through and I can't seem to be able to do that. The full rotation can be seen below. How can I make a half of this but with the nice z axis stuff? This is in a animateWithDuration block (iOS4)
// Create perspective transformation
CATransform3D transform = CATransform3DIdentity;
transform.m34 = 1.0f / -zDistance;
myView.layer.transform = transform; //- 3d
myView.layer.transform =开发者_JAVA百科 CATransform3DMakeRotation(M_PI, -1, 0, 0);
You can do this with two blocks:
// Rotate the second 'backside' view to 90 degrees and hide it
CATransform3D transform = CATransform3DIdentity;
transform.m34 = 1.0f / -zDistance;
mySecondView.layer.transform = transform;
mySecondView.layer.transform = CATransform3DMakeRotation(M_PI / 2, -1, 0, 0);
mySecondView.hidden = YES;
// Animate to 90 degrees
[UIView animateWithDuration:0.5 animations:^{
CATransform3D transform = CATransform3DIdentity;
transform.m34 = 1.0f / -zDistance;
myView.layer.transform = transform;
myView.layer.transform = CATransform3DMakeRotation(M_PI / 2, -1, 0, 0);
} completion:^{
// Switch to the backside view
myView.hidden = YES;
mySecondView.hidden = NO;
// Animate the remaining 90 degrees
[UIView animateWithDuration:0.5 animations:^{
CATransform3D transform = CATransform3DIdentity;
transform.m34 = 1.0f / -zDistance;
mySecondView.layer.transform = transform;
mySecondView.layer.transform = CATransform3DMakeRotation(M_PI, -1, 0, 0);
}
}
You can also experiement with the myView.layer.isDoubleSided
property, which hides the back of a view - although you will still need to toggle the hidden
flag at the end of the animation otherwise the first view's buttons will still be clickable.
Hope this helps! Thanks.
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