RootViewController animation transition, initial orientation is wrong
So I followed this thread: RootViewController Switch Transition Animation to transit the window.rootViewController from A to B to C. Code looks like this:
[UIView transitionWithView:self.window
duration:0.5
options: UIViewAnimationOptionTransitionFlipFromLeft
animations:^{
self.window.rootViewController = newViewController;
}
completion:nil];
The problem is my app shall only support landscape, but during the rootViewController transition, the new view controller appears in portrait mode than quickly rotate to landscape mode.
I'm sure that:
What could be the other reason?
I looked into this just now because I kept getting the same issue. I randomly tried the following, and it worked perfectly:
[UIView
transitionWithView:window
duration:0.5
options:UIViewAnimationOptionTransitionCrossDissolve
animations:^(void) {
BOOL oldState = [UIView areAnimationsEnabled];
[UIView setAnimationsEnabled:NO];
[(ICApp *)sharedApplication.delegate window].rootViewController = self;
[UIView setAnimationsEnabled:oldState];
}
completion:nil];
I know it's a bit odd to disable/enable animations inside an animation block, but the cross dissolve animates, and the rotation does not -- the view controller appears already rotated and ready to roll.
只需放入另一个动画选项UIViewAnimationOptionAllowAnimatedContent ：
[UIView transitionWithView:self.window duration:0.5 options:(UIViewAnimationOptionTransitionFlipFromLeft | UIViewAnimationOptionAllowAnimatedContent) animations:^{
self.window.rootViewController = newViewController;
} completion:nil];