UIContextualAction 图标是否有推荐的图像大小? [英] Is there a recommended image size for UIContextualAction icons?

问题描述

iOS 11 中的新功能，UIContextualAction 提供了一种在UITableView 单元格，带有标题和/或图像图标.

New in iOS 11, UIContextualAction provides a convenient way to implement swipe actions on UITableView cells, with a title and/or image icon.

我在人机界面指南中没有发现 UIContextualAction 使用的图像的任何提及.是否存在定义此图标图像的标准尺寸或其他设计指南的信息?

I haven't found any mention in the Human Interface Guidelines of the image used by UIContextualAction. Does any information exist that defines a standard size or other design guidance for this icon image?

我试图通过测试一些图像大小来解决这个问题，看看 iOS 是否会将它缩放到一致的大小，但它似乎只显示你给它的任何东西，没有缩放或裁剪，所以没有提供任何线索.

I tried to figure this out by testing a few image sizes to see if iOS would scale it to a consistent size, but it seems to just display whatever you give it with no scaling or cropping, so that didn't provide any clues.

推荐答案

我使用 30 x 30.你可以很容易地在代码中将图像渲染到那个大小.

I use 30 by 30. You can render your image down to that size in code easily enough.

    let d = UIContextualAction(style: .destructive, title: nil) {
        action, view, completion in
        // ... whatever ...
        completion(true)
    }
    d.image = UIGraphicsImageRenderer(size: CGSize(width: 30, height: 30)).image { _ in
        UIImage(named: "trash")?.draw(in: CGRect(x: 0, y: 0, width: 30, height: 30))
    }

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