UIView在情节提要中切换风景和肖像场景的动画？

Question

I'm trying to design different layouts for my view controller. After googling, I've got this answer from SO. Basically, the answer instructs me to setup 2 scenes, one for landscape and one for portrait, when the device rotates, hide one and show the other one.

And my question is what if I want to add a sweet animation for the rotation process? For example, since I can setup the same view on different scenes, can I set the motion path for these views and disappear? Or, if it is easier, can I add some rotation and fade out animation?

I'm quite green with Core Animation, so a detailed explanation is very useful for me. Big big thanks in advance!

Answer 1

There are a few options here. The main methods you are looking for to do any of this are:

- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation 
                                duration:(NSTimeInterval)duration;

and

- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation;

If you want to move the elements around the screen while the rotation is happening you will be best off changing the frames of the elements rather than creating a separate view file. Using any motion animation would require some mapping between the two and I have never heard of anything like this before. Again, if you just change the frames though, you can preform basically any screen movements you would like (for views and subviews).

To do the fading you could just throw an animation block in the first method:

[UIView animateWithDuration:duration 
                     animations:^{
    // set alphas for old and new views here.
}];