为深色或浅色模式启动图像

Question

有谁知道我如何为暗模式或亮模式选择一组不同的启动图像？

Answer 1

As the Launch Screen loads before the app starts executing, it would not be possible to change the launch images set programatically.

However, in the Image Set tab, you can change the Appearance option to enable a different set of images for Light and Dark modes:

So, if you set this image in the Launch Screen Storyboard, the result would be as below:

On a side note, if the need is just to change the background color, not the images, you may set the Launch Screen Storyboard view background color to System Background Color and just use transparent .png images.

Answer 2

1. Xcode 11 supports only storyboard Launch screen files. It means I should to use storyboards.
2. In storyboards we can use UIImageViews + images from .xcassets. Assets support images with different variants: Light, Dark modes. You can apply constraints for positioning them on screen.
3. If you support iOS before 11.0 you can not use system dynamic colors for backgrounds of the screen view. In this case you put additional dynamic image to screen as background and apply leading, trailing, top and bottom constraints with negative values. Negative values are needed for covering Top and Bottom Bars. (I used -64px)

Answer 3

You need to add dark appearance for your asset, or for the asset color you are using, like in the image below:

Answer 4

This WWDC'19 session gives an introduction to Dark Mode, the principles behind it, and tips on how to add support for it in an app.

If you start somewhere at 10:10, you'll get an idea of how to implement launch images for dark and light mode.

Answer 5

You should do something like this to use light and dark mode images

1. Step 1 - Create image set in assets.xassets like this

2. Step 2 - Select Image select like this

3. Steps 3 - Change appearance to Any, Light , Dark like this

4. Add your images for any light and dark mode like this and use this image wherever you need it

Answer 6

仅就我的经验而言，有时当您擦除应用程序、关闭设备并再次打开时，启动图像会发生变化。