我正在视图控制器之间实现自定义过渡动画，但出于某种原因，我的导航栏会随着过渡动画一起动画化。这是某种自动布局问题吗？我不确定它会是怎样的。 这是我用来显示和关闭具有自定义转换的视图控制器的代码。
我希望导航栏不会动画，任何想法为什么会发生这种情况？
-(void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext
{
// Grab the from and to view controllers from the context
UIViewController *fromViewController = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
UIViewController *toViewController = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
if (self.presenting) {
fromViewController.view.userInteractionEnabled = NO;
[transitionContext.containerView addSubview:fromViewController.view];
[transitionContext.containerView addSubview:toViewController.view];
int frameHeight = fromViewController.view.frame.size.height;
CGRect startFrame = fromViewController.view.frame;
startFrame.origin.y = frameHeight;
toViewController.view.frame = startFrame;
//create a view with the same background color to cover up background on bounce effect
UIView *bottomCover = [[UIView alloc]initWithFrame:CGRectMake(0, startFrame.size.height-30, startFrame.size.width, 30)];
[bottomCover setBackgroundColor:[UIColor colorWithRed:0.956 green:0.962 blue:0.956 alpha:1]];
[transitionContext.containerView insertSubview:bottomCover belowSubview:toViewController.view];
__block CGRect endFrame = toViewController.view.frame;
[UIView animateWithDuration:[self transitionDuration:transitionContext] delay:0 usingSpringWithDamping:.75 initialSpringVelocity:1.0 options:UIViewAnimationOptionCurveEaseIn animations:^{
endFrame.origin.y = 0;
toViewController.view.frame = endFrame;
} completion:^(BOOL finished) {
[bottomCover removeFromSuperview];
toViewController.view.frame = endFrame;
[transitionContext completeTransition:YES];
}];
}
else {
toViewController.view.userInteractionEnabled = YES;
[transitionContext.containerView addSubview:toViewController.view];
[transitionContext.containerView addSubview:fromViewController.view];
CGRect endFrame = toViewController.view.frame;
endFrame.origin.y = 0;
fromViewController.view.frame = endFrame;
[UIView animateWithDuration:[self transitionDuration:transitionContext] delay:0 usingSpringWithDamping:.9 initialSpringVelocity:1.0 options:UIViewAnimationOptionCurveEaseIn animations:^{
int frameHeight = toViewController.view.frame.size.height;
CGRect startFrame = fromViewController.view.frame;
startFrame.origin.y = frameHeight;
fromViewController.view.frame = startFrame;
} completion:^(BOOL finished) {
[transitionContext completeTransition:YES];
//Because there is a bug in Xcode apparently.
[[UIApplication sharedApplication].keyWindow addSubview:toViewController.view];
}];
}
}