ios - 更改键窗口不会调用视图将/确实显示/出现

Question

当我更改键窗口时，rootViewController(s) 不接收视图将/确实出现/消失。

    SplashViewController *screenLockViewController = [[SplashViewController alloc] initWithNibName:@"SplashViewController" bundle:nil];
    [self.splashWindow.rootViewController presentViewController:splashViewController animated:NO completion:nil];

    [self.splashWindow makeKeyWindow];

    __weak typeof(self) welf = self;
    [UIView transitionWithView:self.window
                      duration:0.25
                       options:UIViewAnimationOptionTransitionNone
                    animations:^{
                        welf.window.alpha = 0.0f;
                    } completion:^(BOOL finished) {
                        [welf.window setHidden:YES];
                    }];

更新： 手动调用– beginAppearanceTransition:animated:和– endAppearanceTransition来自https://stackoverflow.com/a/25033107/2287841

    SplashViewController *screenLockViewController = [[SplashViewController alloc] initWithNibName:@"SplashViewController" bundle:nil];
    [self.splashWindow.rootViewController presentViewController:splashViewController animated:NO completion:nil];

    [self.window.rootViewController beginAppearanceTransition:NO animated:shouldAnimate]; // call view will disappear
    [self.splashWindow makeKeyWindow];

    __weak typeof(self) welf = self;
    [UIView transitionWithView:self.window
                      duration:0.25
                       options:UIViewAnimationOptionTransitionNone
                    animations:^{
                        welf.window.alpha = 0.0f;
                        [welf.window.rootViewController endAppearanceTransition]; // call view did disappear
                    } completion:^(BOOL finished) {
                        [welf.window setHidden:YES];
                    }];