UIBarButtonItem突出显示的颜色 [英] UIBarButtonItem Highlighted Color

问题描述

我为 UINavigationBar （在 UINavigationController 内）设置了自定义色调颜色，插入到 UINavigationBar 中的 UIBarButtonItems 的适当匹配颜色。然而，当我选择一个 UIBarButtonItem 按钮变成（大概）突出显示的状态，并呈现一种不同的颜色，看起来相当有点，不能很好地匹配的色彩颜色。有没有办法改变这个突出显示的状态颜色为自定义颜色？

理想情况下，我想只是创建一个类别 UIBarButtonItem ，这会更改 UIBarButtonItem 的所有实例的突出显示的颜色，因为这将避免需要显式子类化 UIBarButtonItems 然后更改我的应用程序中的每个引用使用子类（这将是棘手的，因为我使用一些第三方库只是使用 UIBarButtonItem

解决方案。

任何帮助将非常感谢。从我记得面对一个类似的问题，UINavigationBar将只是采取tintColor和使它更暗的UIBarButtonItem（除非风格设置为BarStyleBlack，在这种情况下，它使它成为一个暗灰色）。

要做你想要的，我将创建一个自定义的UIButton与背景图像为不同的控制状态匹配您的配色方案，然后使用此UIButton作为视图自定义UIBarButtonItem。

  UIButton * customButton = [UIButton buttonWithType：...] 
 
 //normal_button.png和selected_button.png需要由你创建
 [customButton setBackgroundImage：[UIImage imageNamed：@normal_button.png] forState：UIControlStateNormal]; 
 [customButton setBackgroundImage：[UIImage imageNamed：@selected_button.png] forState：UIControlStateSelected]; 
 
 UIBarButtonItem * barButtonItem = [[UIBarButtonItem alloc] initWithCustomView：customButton]; 
  

如果你想尝试并封装这个，你总是可以创建一个工厂或自定义init方法UIBarButtonItem（通过类别），并使用上面的代码（稍作修改）。

我知道我没有完全解决你的第二点只是覆盖控制状态与类别。我不知道什么方法重写在UIBarButtonItem做这样的事情，但你可以能够通过方法swizzling（http://cocoadev.com/index.pl?MethodSwizzling）一旦你找到了哪个

我应该注意，我只使用swizzling进行测试/调试。

I have set a custom tint color for a UINavigationBar (within a UINavigationController) which, in turn, sets an appropriate matching color for the UIBarButtonItems which are inserted into the UINavigationBar. However, when I select a UIBarButtonItem the button turns into (presumably) the highlighted state and presents a different color, which looks quite a bit out and does not nicely match the tint color. Is there a way to change this highlighted state color to a custom color?

Ideally, I would like to just create a category on UIBarButtonItem which changes the highlighted color for all instances of UIBarButtonItem, as this would avoid the need to explicitly subclass UIBarButtonItems and then change every reference in my app to use the subclass (which will be tricky, as I am using some third-party libraries which just use UIBarButtonItem and I don't want to go messing with their implementation).

Any help would be greatly appreciated.

解决方案

From what I remember from facing a similar issue, UINavigationBar will just take the tintColor and make it darker for the UIBarButtonItem (unless the style is set to BarStyleBlack, in which case it makes it a dull gray).

To do what you ask, I would create a custom UIButton with background images for the different control states that match your color scheme, then use this UIButton as the view for a custom UIBarButtonItem.

UIButton *customButton = [UIButton buttonWithType:...];

//normal_button.png and selected_button.png need to be created by you
[customButton setBackgroundImage: [UIImage imageNamed:@"normal_button.png"] forState:UIControlStateNormal];
[customButton setBackgroundImage: [UIImage imageNamed:@"selected_button.png"] forState:UIControlStateSelected];

UIBarButtonItem *barButtonItem = [[UIBarButtonItem alloc] initWithCustomView: customButton];

If you want to try and encapsulate this, you could always create a factory or a custom init method on UIBarButtonItem (via a category) and use the above code (with slight modifications).

I am aware that I am not fully addressing your second point on just overriding the control state with a category. I don't know what method to override in UIBarButtonItem to do such a thing, but you may be able to accomplish what you want via method swizzling (http://cocoadev.com/index.pl?MethodSwizzling) once you find out which method you want to exchange.

I should note that I've only ever used swizzling for testing/debugging.

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