iOS 7 UINavigationController NavBar每个控制器的颜色动画

问题描述

有任何方法可以有不同的 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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