iOS 7 UINavigationController NavBar每个控制器的颜色动画 [英] iOS 7 UINavigationController NavBar per controller color animation

问题描述

有任何方法可以有不同的 barTintColor UINavigationController ' UINavigationBar 在不同的推动控制器上使用平滑的颜色过渡动画？

Is there any way to have different barTintColor of UINavigationController's UINavigationBar on different pushed controllers with smooth color transition animation?

我想要一个平滑的动画 UINavigationBar 在 UINavigationController 的推/弹动动画，最理想的是 based controller pop）。

I'd like to have a smooth animation of UINavigationBar's tint color during UINavigationController's push/pop animation and ideally also interactive pop (gesture based controller pop).

为什么需要这个？我想在导航堆栈中有一个控制器，以具有不同的颜色指示某些任务的状态（红/绿等）。

Why do I need this? I'd like to have 1 controller in the navigation stack to have different tint color indicating status of some task (red / green etc.).

我试过的far：

• viewWillAppear （查看生命周期）方法，但没有办法动画 barTintColor （如 setBarTintColor：animated：）


• code> barTintColor 在 [UIView animation ...] 块，但是只是奇怪地动画框架 c> [UIView transitionWithView：...] 更改 barTintColor c $ c>阻塞与 UIViewAnimationOptionTransitionCrossDissolve ，但不是动画变化。


• 我想在实施新的iOS 7自定义过渡计算和改变导航条的颜色，但是似乎是大的过度杀戮特别是如果我想保持原始动画出现无处不在）

• viewWillAppear (view lifecycle) methods, but there is no way to animate the barTintColor (like setBarTintColor:animated:)
• To change barTintColor in [UIView animation...] block, but that just weirdly animates frame of (probably) some background layer instead of smooth color transition.
• To change barTintColor in [UIView transitionWithView:...] block with UIViewAnimationOptionTransitionCrossDissolve, but that does not animate change. Just instantly changes to new tint color after the animation duration
• I had an idea of implementing new iOS 7 custom transition calculating and changing color of navbar during progress, but that seems to be big overkill (specially if I want to keep original animation appearance everywhere)

感谢大家的任何想法和答案

Thank you everyone for any ideas and answers

推荐答案

您可以使用 UIViewControllerTransitionCoordinator 获得这个。

1. 将示例代码复制到 AController 并自定义颜色。


2. 复制示例代码到 BController 并自定义颜色。


3. 就是这样！在 UINavigationController 的push / pop转换期间， AController 的样式将平滑地淡入/ $ c> BController 的样式。

1. Copy the example code to the AController and customize the colors.
2. Copy the example code to the BController and customize the colors.
3. That's it! During UINavigationController's push/pop transition, the AController's style will smoothly fade in/out to BController's style.

示例代码：

-(void) viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];

    [[self transitionCoordinator] animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext> context) {
        self.navigationController.navigationBar.translucent = NO;
        self.navigationController.navigationBar.barStyle = UIBarStyleDefault;

        // text color
        [self.navigationController.navigationBar setTitleTextAttributes:@{NSForegroundColorAttributeName : [UIColor whiteColor]}];

        // navigation items and bar button items color
        self.navigationController.navigationBar.tintColor = [UIColor whiteColor];

        // background color
        self.navigationController.navigationBar.barTintColor = [UIColor blueColor];
    } completion:nil];
}

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