UIBarButtonItem图像应该有多大？ [英] How big should a UIBarButtonItem image be?

问题描述

我正在寻找创建我自己的自定义按日期排序和按数字排序按钮，我计划将其作为右按钮放置在导航栏中。

I'm looking to create my own custom Sort By Date and Sort By Number buttons that I plan on placing in the navigation bar as the right button.

如何我的形象应该适当填补空间 - UIBarItem 文档页面没有列出图像大小的任何内容。

How big should my image be to appropriately fill the space -- the UIBarItem documentation page doesn't list anything about the size the image should be.

推荐答案

从iOS 11开始，人机界面指南建议字形大约为25次;工具栏和导航栏中的25个点，最多大约28个点。 （如果您正在使用iOS应用程序，那么HIG肯定会出现在您的书签中！）

As of iOS 11, the Human Interface Guidelines suggest glyphs be about 25×25 points in toolbars and navigation bars, up to a maximum of about 28 points. (And the HIG should definitely be in your bookmarks if you're working on iOS apps!)

对于像iPad 2 / Mini这样的旧设备，这将转换为25像素的图像，大多数现有设备（如iPhone 8或iPad）为50像素，而Retina HD设备为75像素（iPhone 6/7/8 Plus或iPhone X）。资产目录将极大地帮助保持不同资产规模的组织（Xcode甚至可以从中生成它们矢量来源这些天）。

That would translate to images 25px square for older devices like iPad 2 / Mini, 50px square for most current devices like iPhone 8 or iPad, and 75px square for Retina HD devices (the iPhone 6/7/8 Plus, or iPhone X). Asset catalogs will help immensely in keeping the different asset sizes organized (and Xcode can even generate them from vector sources these days).

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