用翻转过渡改变leftBarButtonItem？ [英] Changing leftBarButtonItem with flip transition?

问题描述

在我的代码中，我以编程方式将带有UIButton的leftBarButtonItem更改为UIActivityIndi​​catorView，我想知道如何在更改时执行翻转过渡，任何想法？

In my code I programmatically change leftBarButtonItem with a UIButton to a UIActivityIndicatorView, I would like to know how to perform a flip transition when changing, any idea ?

谢谢很多。

推荐答案

嗯..我觉得要做一个翻转过渡，你需要有一个UIView。

Hmm.. I have a feeling that to do a flip transition, you need to have a UIView.

所以..你可以制作一个自定义barButtonItem并添加一个flipView：

So.. you could make a custom barButtonItem and add to it a flipView:

UIView *flipView = [[UIView alloc] init....];
BarButtonItem *barbutton = [[BarButtonItem alloc] initWithCustomView:flipView];

然后将原始视图添加到flipView，这可以包含您喜欢的任何内容......

then add your original view to the flipView, this can contain whatever you like...

[flipView addSubview:<original view>];

然后将其转换为UIActivityIndi​​catorView，我想你需要做这样的事情：

Then to flip this into a UIActivityIndicatorView, I think you need to do something like this:

[UIView beginAnimations:@"flip" context:NULL];
[UIView setAnimationDuration:1];
[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:flipView cache:YES];

[<original view> removeFromSuperView];
[flipView addSubview:<activityIndicatorView>];

[UIView commitAnimations];

您可能需要在某个地方保留对flipView的引用，以便您可以返回对当你想要执行翻转时。

You'll probably have to keep a reference to your flipView somewhere so you can bring back a reference to it when you want to perform the flip.

希望这会有所帮助！

Nick。

这篇关于用翻转过渡改变leftBarButtonItem？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IT屋！