[[UIApplication sharedApplication] setStatusBarHidden:hide withAnimation:UIStatusBarAnimationSlide];
[self.navigationController setNavigationBarHidden:hide animated:animated];
然而，这两个动画的持续时间并不相同。状态栏动画需要更长的时间。 我找不到指定任何一个动画持续时间的方法。 我错过了什么明显的东西吗？
ios-lizard的回答几乎满足了我的要求，但是在旋转设备时，导航栏会重新出现，除非正确设置hidden。因此，对我而言，以下内容有效：
隐藏动画很好看！太棒了！！
显示动画还不错（我希望能让状态栏与导航栏一起滑动，但至少我们不再看到间隙了。:D）
- (void)toggleFullscreen {
UINavigationBar *navBar = self.navigationController.navigationBar;
CGRect statusBarFrame = [[UIApplication sharedApplication] statusBarFrame];
float animationDuration;
if(statusBarFrame.size.height > 20) { // in-call
animationDuration = 0.5;
} else { // normal status bar
animationDuration = 0.6;
}
_fullscreen = !_fullscreen;
if (_fullscreen) {
// Change to fullscreen mode
// Hide status bar and navigation bar
[[UIApplication sharedApplication] setStatusBarHidden:YES
withAnimation:UIStatusBarAnimationSlide];
[UIView animateWithDuration:animationDuration animations:^{
navBar.frame = CGRectMake(navBar.frame.origin.x,
-navBar.frame.size.height,
navBar.frame.size.width,
navBar.frame.size.height);
} completion:^(BOOL finished) {
[self.navigationController setNavigationBarHidden:YES animated:NO];
}];
} else {
// Change to regular mode
// Show status bar and navigation bar
[[UIApplication sharedApplication] setStatusBarHidden:NO
withAnimation:UIStatusBarAnimationSlide];
[UIView animateWithDuration:animationDuration animations:^{
navBar.frame = CGRectMake(navBar.frame.origin.x,
statusBarFrame.size.height,
navBar.frame.size.width,
navBar.frame.size.height);
} completion:^(BOOL finished) {
[self.navigationController setNavigationBarHidden:NO animated:NO];
}];
}
}
CGRect statusBarFrame = [[UIApplication sharedApplication] statusBarFrame];
// delta is the amount by which the nav bar will be moved
delta = statusBarFrame.size.height + self.navigationController.navigationBar.frame.size.height;
if(statusBarFrame.size.height>20) { // in-call
animationDuration = 0.5;
}
else { // normal status bar
animationDuration = 0.6;
}
// hide status bar
[[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation:UIStatusBarAnimationSlide];
// hide nav bar
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:animationDuration];
self.navigationController.navigationBar.frame = CGRectOffset(self.navigationController.navigationBar.frame, 0.0, -delta);
[UIView commitAnimations];
nacho4d的回答几乎符合我的要求。但是，他在navBar可见之前更改了navBar的frame。因此，我们看不到过渡动画。它看起来像navBar突然出现。更重要的是，在显示时，statusBarFrame.size.height等于0。这是他的代码：
[[UIApplication sharedApplication] setStatusBarHidden:NO
withAnimation:UIStatusBarAnimationSlide];
[UIView animateWithDuration:animationDuration animations:^{
navBar.frame = CGRectMake(navBar.frame.origin.x,
statusBarFrame.size.height,
navBar.frame.size.width,
navBar.frame.size.height);
} completion:^(BOOL finished) {
[self.navigationController setNavigationBarHidden:NO animated:NO];
}];
UINavigationBar *navBar = self.navigationController.navigationBar;
[[UIApplication sharedApplication] setStatusBarHidden:hidden withAnimation:UIStatusBarAnimationSlide];
[UIView animateWithDuration:0.35 delay:0 options:UIViewAnimationOptionCurveEaseOut animations:^{
// make navigationBar visual
if (!hidden)
{
[self.navigationController setNavigationBarHidden:hidden animated:NO];
}
navBar.frame = CGRectMake(navBar.frame.origin.x,
hidden ? -navBar.frame.size.height : 20,
navBar.frame.size.width,
navBar.frame.size.height);
} completion:^(BOOL finished) {
if (hidden)
{
[self.navigationController setNavigationBarHidden:hidden animated:NO];
}
}];
- (IBAction)toggleControls:(id)sender {
BOOL isHidden = ! [UIApplication sharedApplication].statusBarHidden;
if (isHidden)
statusBarHeight = [UIApplication sharedApplication].statusBarFrame.size.height;
[UIView animateWithDuration:[UIApplication sharedApplication].statusBarOrientationAnimationDuration animations:^{
self.navigationBar.frame = CGRectMake(self.navigationBar.frame.origin.x,
isHidden ? -self.navigationBar.frame.size.height : statusBarHeight,
self.navigationBar.frame.size.width,
self.navigationBar.frame.size.height);
}];
[[UIApplication sharedApplication] setStatusBarHidden:isHidden withAnimation:UIStatusBarAnimationSlide];
}
显然，没有简单的解决方案来正确地完成这个任务。苹果必须修复它。
当然，一个解决方法是使用 Ephraim 建议的 alpha fading。如果你坚持要滑动行为，我发现最好只是动画化导航栏并隐藏/显示状态栏而不进行任何动画。这比滑动状态栏看起来更好，因为在动画期间两个栏之间的间隙非常明显。
这不算是一个很好的答案，但它能够工作。所以我做的是：
// This method gets called by whatever action you want
- (void) toggleShowStatusNavBars:(id)sender {
// Assuming you have a ivar called barsHidden
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.4]; // This is IMPORTANT, 0.4s
self.navigationController.navigationBar.alpha = (barsHidden?1.0:0.0);
barsHidden = !barsHidden;
[UIView setAnimationDelegate:self];
[UIView setAnimationWillStartSelector:@selector(setStatusBarHidden)];
[UIView commitAnimations];
}
- (void) setStatusBarHidden {
[[UIApplication sharedApplication] setStatusBarHidden:barsHidden animated:YES];
}
这将基本上同步动画的开始（因为您在导航栏动画开始时调用了setStatusBarHidden）。关键部分是状态栏动画似乎需要0.4秒。
这对我有用，但如果您找到更好的方法，请在此处发布。
self.navigationController setNavigationBarHidden:hide animated:animated];
_shouldHideStatusBar = hide;
并实现以下函数：
- (BOOL)prefersStatusBarHidden{
return _shouldHideStatusBar;
}
setNavigationBarHidden:animated函数将自动调用prefersStatusBarHidden函数。如果没有，则可以使用以下UIViewController方法调用该函数：
[self setNeedsStatusBarAppearanceUpdate];
当然，您可以使用以下代码选择状态栏隐藏动画样式：
- (UIStatusBarAnimation) preferredStatusBarUpdateAnimation {
return UIStatusBarAnimationSlide;
}