It seems Xcode 8 not supported, here is a Solution, and Here, use at your own risk!

A Xcode plugin to automatically generate @2x, @1x image from @3x image for you, or upscale to @3x from @2x. As easy as you press Ctrl+Shift+A, and DONE!

You have to put your .xcassets in the folder the same name with the project, which means, if your project is abc.xcodeproj, and the assets must be in the abc folder

• Only generate those missing assets, if you have already set your own @2x image, it does nothing
• Automaticaly rename those image files under N.imageset to N.png, [email protected], [email protected]
• Easy to use, don't need ask for your designer's help any more!

• Auto generate all the App icons needed。press Ctrl+Shift+Option+A to open App Icon window, choose the xcasset, then the appiconset you want to use, drag & drop 1024x1024 big icon, and click generate, DONE!

Clone this Repo, build it in Xcode, and restart your Xcode.

Install Package Manager for Xcode, search: RTImageAssets.

This plugin is NOT fully tested, if you have any problems, please let me know: https://github.com/rickytan/RTImageAssets/issues

• Prepo
• Asset Catalog Creator

• sketch-measure-downloader: A Chrome extension to download sketch-measure exported asserts as a zip file
• XPaste: A Xcode extension to power up your code paste ability
• RTComponentTableView: A Componentized UITableView implementation
• RTPlaceholderTextView: A UITextView with placeholder support
• RTIconButton: A drop-in replacement for UIButton
• RTViewAttachment: Attach a custom UIView to text view, based on NSTextAttachment
• RTRootNavigationController: Implicitly make every view controller has its own navigation bar
• RTPagedCollectionViewLayout: A paged collection view layout
• RTTinyPNGWebAPIPlugin: A Xcode plugin which calls http://tinypng.com api to minimize image assets
• RTDraggableBadge: A drag to clear badge view

MIT

本项目是一个 Xcode 插件，用来生成 @3x 的图片资源对应的 @2x 和 @1x 版本，只要拖拽高清图到 @3x 的位置上，然后按 Ctrl+Shift+A 即可自动生成两张低清的补全空位。当然你也可以从 @2x 的图生成 @3x 版本，如果你对图片质量要求不高的话。

请将您的 .xcassets 放到与项目名同名的目录下，如 abcd.xcodeproj ，那么放到 abcd 目录下！

• 只会填补空位，如果你已经设置好了自己的 @2x 图，则不会生成；
• 自动重命名，保持项目干净（把 N.imageset 下的图片名字改为 N.png [email protected] [email protected] 等）；
• 使用简单，不用再麻烦美术同学缩放了；

• 自动生成所有所需的应用程序图标。按 Ctrl+Shift+Option+A 打开 App Icon 窗口，选择 xcasset，再选择 appiconset，拖拽 1024x1024 的大图标到窗口中，点击 generate，完成！

  ***注意：***本插件从 @3x 到 @2x 的缩放保证图片在屏幕上显示的物理尺寸一样，而不是与屏幕比例一样，缩放系数是 1.5，而不是 1242 / 640 = 1.94。

下载本项目，在 Xcode 中打开，构建、重启即可。

安装 插件管理 插件，搜索：RTImageAssets。

此插件还没有经过严格测试，如果你有什么问题，请提出：https://github.com/rickytan/RTImageAssets/issues

• Prepo
• Asset Catalog Creator

• sketch-measure-downloader: A Chrome extension to download sketch-measure exported asserts as a zip file
• XPaste: A Xcode extension to power up your code paste ability
• RTComponentTableView: A Componentized UITableView implementation
• RTPlaceholderTextView: A UITextView with placeholder support
• RTIconButton: A drop-in replacement for UIButton
• RTViewAttachment: Attach a custom UIView to text view, based on NSTextAttachment
• RTRootNavigationController: Implicitly make every view controller has its own navigation bar
• RTPagedCollectionViewLayout: A paged collection view layout
• RTTinyPNGWebAPIPlugin: A Xcode plugin which calls http://tinypng.com api to minimize image assets
• RTDraggableBadge: A drag to clear badge view

MIT