问题描述
是否可以通过动画更改色调以获得更平滑的效果?
Is it possible to change the tint with animation for a smoother effect?
这对我不起作用:
[UIView beginAnimations:nil context:nil];
[self.navigationController.navigationBar setTintColor:[UIColor greenColor]];
[UIView commitAnimations];
我不确定是否可以使用原生苹果组件,因为我猜他们会使用CG生成渐变...只是想在我开始构建自己的解决方案之前找出...
I a not sure if it is even possible using native apple components as I guess they will be using CG to generate the gradient ... just want to find out before I'll start building my own solution ...
干杯们:)
推荐答案
你不会相信我经历的那么长的时间才能做到这一点;让我感到恼火的是,这不是iOS的一个特色,而且tintColor的转换看起来很难看,而推动/弹出一个viewController的动画是如此顺利。
You wouldn't believe the length I went through to actually make that possible; it annoyed me to no end that this isn't a stock iOS feature and that transition of tintColor look ugly while the animation to push/pop a viewController is so smooth.
有很多代码在淡出时检查,我甚至编写了一个名为PSPDFNavigationAppearanceSnapshot的类来保存弹出时的导航状态。 (我从很棒的中得到了这个想法)
There'a lot of code that checks when to fade, and I've even written a class called PSPDFNavigationAppearanceSnapshot to preserve the navigation state when being popped. (I got that idea from the awesome NimbusKit)
实际动画很简单:
[self.navigationController.navigationBar.layer addAnimation:PSPDFFadeTransition() forKey:nil];
CATransition *PSPDFFadeTransition(void) {
return PSPDFFadeTransitionWithDuration(0.25f);
}
CATransition *PSPDFFadeTransitionWithDuration(CGFloat duration) {
CATransition *transition = [CATransition animation];
transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
transition.type = kCATransitionFade;
transition.duration = duration;
return transition;
}
您可以进一步压缩该代码;它来自我的iOS PDF库PSPDFKit,我在各个地方使用淡入淡出,因此辅助函数。
You can compact that code even more; it's a snipped from my iOS PDF library PSPDFKit and I use the fade in various places, thus the helper functions.
这篇关于UINavigationBar用动画改变Tint颜色的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!