objective-c - UIStatusBarAnimationFade 持续时间

Question

我有一个应用程序，其中有一个使屏幕逐渐变黑的按钮。我也想让状态栏变黑，所以我使用以下代码:

[[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation:UIStatusBarAnimationFade];

我可以设置淡入淡出的持续时间吗？如果那不可行，是否可以获取官方的淡入淡出持续时间(例如使用 UIKeyboardAnimationDurationUserInfoKey 获取键盘滑动持续时间)。

---

好吧，我没有从任何人那里得到任何返回，但我认为我至少应该分享我的技巧。经过一些实验，我确定淡出为 1 秒，淡入为 0.25 秒。

- (IBAction)fadeToBlack:(id)sender
{
    UIView *view = [[[UIView alloc] initWithFrame:self.view.window.frame] autorelease];
    view.backgroundColor = [UIColor blackColor];
    view.alpha = 0.0;
    [self.view.window addSubview:view];

    // NOTE: Fading the black view at the same rate as the status bar. Duration is just a guess.
    [[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation:UIStatusBarAnimationFade];
    [UIView animateWithDuration:1.0 animations:^{
        view.alpha = 1.0;
    } completion:^(BOOL finished) {
        [view addGestureRecognizer:self.dismissViewGesture];
    }];
}

- (void)dismissViewWithGesture:(UIGestureRecognizer *)gesture
{
    UIView *view = gesture.view;
    [view removeGestureRecognizer:gesture];

    // NOTE: Fading the black view at the same rate as the status bar. Duration is just a guess.
    [[UIApplication sharedApplication] setStatusBarHidden:NO withAnimation:UIStatusBarAnimationFade];
    [UIView animateWithDuration:0.25 animations:^{
        view.alpha = 0.0;
    } completion:^(BOOL finished) {
        [view removeFromSuperview];
    }];
}

Answer 1

我有同样的问题，我的值是 0.5 表示隐藏，0.2 表示导航栏和状态栏一起显示。至少对于 iOS 6.1/iOS Simulator，这些值更符合现实。