包含在多个类中的iOS 6外观 [英] iOS 6 appearance when contained in multiple classes

问题描述

我在我想要在iOS 6应用中自定义的某些UI元素上使用 appearanceWhenContainedIn 方法。我发现的问题是，如果我尝试提供多个容器类，则不会应用任何自定义项，如下所示：

I’m using the appearanceWhenContainedIn method on certain UI elements that I want to customise in my iOS 6 app. The problem I found is that none of my customisations are applied if I try to provide more than one container class, like so:

// Works neither for toolbar nor navbar items
[UIBarButtonItem appearanceWhenContainedIn:[UINavigationBar class], [UIToolbar class], nil]

// Works fine (but only for navbar items, obviously)
[UIBarButtonItem appearanceWhenContainedIn:[UINavigationBar class], nil]

官方文档说明这个方法的参数可以是一个nil终止的多个类列表，但在我的情况下，它永远不会按照它应该的方式工作。我在这里遗漏了什么吗？

The official docs say that the parameter for this method can be a nil-terminated list of multiple classes, but in my case it never works the way it should. Am I missing something here?

推荐答案

来自文档：

appearanceWhenContainedIn：

...

给定包含
层次结构中接收者的外观代理。

The appearance proxy for the receiver in a given containment hierarchy.

这实际上意味着没有-terminated list不定义UIBarButtonItem的容器类列表，而是从上到下定义容器层次结构，所以

That actually means that nil-terminated list defines not the list of the container classes for UIBarButtonItem, but container hierarchy from top to bottom, so

[UIBarButtonItem appearanceWhenContainedIn:[UINavigationBar class], [UIToolbar class], nil]

返回里面的UIBarButtonItem的外观代理UINavigationBar和UINavigationBar依次在UIToolbar中。

returns appearance proxy for UIBarButtonItem that is inside UINavigationBar, and UINavigationBar in turn is inside UIToolbar.

或

[[UIBarButtonItem appearanceWhenContainedIn:[UIToolbar class],[ViewController class], nil] setTintColor:[UIColor redColor]];

为ViewController类中任何UIToolBar中的UIBarButtonItems设置红色色调。

set red tint color for UIBarButtonItems that are in any UIToolBar which are in ViewController class.

因此，要分别为UINavigationBar和UIToolBar设置外观，您需要对 + appearanceWhenContainedIn：方法进行2次单独调用

So to set appearance for UINavigationBar and UIToolBar separately you'll need 2 separate calls to the +appearanceWhenContainedIn: method

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