自定义tabar,看了很多网上的例子, 和我要做的效果不一样,一直没有找到合适的.看了一篇How to Customize UITabBar on iOS 5效果非常的好.
Building the new version of the app Blocos de Rua I was challenged to customize the UITabBar
so it meets what the designer wants. In iOS 5 this is pretty easy to do but I haven’t figured out the proper way to do it from the beginning, this post is my findings on how to do it properly by correctly using the new iOS 5 APIs to customize appearance.
The final look:
Keep reading to see the code.
The appearance APIs in iOS 5 are great. They reduce lots of custom drawRect:
that used to be necessary to customize the default UIKit components. The first time I tried to customized the tab bar I had some problems with images been offset upwards because I was using the wrong methods. First thing I learned, the setFinishedSelectedImage:finishedUnselectedImage:
from UITabBarItem
is the tab’s icon not a image for the whole tab with background, icon and label.
Customize the UITabBar
is a peace of cake when you understand how the APIs should be used, take a look:
From inside out, the UITabBar
First - usually in your app delegate - set the image for the entire tab bar’s background, which represents the “normal” state of all tabs. The dimension is 320 x 49 points.
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Then configure the selected state of a tab. This is necessary because in this app I don’t want the default white highlight that represents the selected tab. Pay attention to the image’s width, it must be the same of a single tab. In my case 320/4, 80 points wide.
这个是选中按钮背景的状态
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Last but not least, the UITabBarItem
Unlike the default behavior the image shouldn’t change when the tab is selected, this is why I set the same image in both states. For each UIViewController
that will be part of the tab bar you need to configure the tab image like this:
在这设置选中图片和未选中状态的图片. 30*30px @2x-> 60*60px
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The last detail is the title’s color on the unselected tab, they can’t be the default gray color. To change the color we need a dictionary of attributes whit the UITextAttributeTextColor
key:
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That’s all folks.