我也面临同样的问题。

添加一个新的图像集到XcodeAssets。 将图像添加到映像集中。 添加图像视图，以启动屏幕和设置您的imageset为图像 在Imageview的属性检查器中，取消选中“清除图形上下文” 清理生成文件夹并再次运行。

在我的情况下，重置模拟器的内容和设置解决了这个问题。

I just figured this out. My launch image was not showing up, I get a white screen when launching on a device (iPhone 6, 7+) or testFlight. Fix: Renamed "Landing_screen.png" to just "Landing_screen" removing .png part. The image icon in Xcode changed to white icon and in the launch screen storyboard the image appears as a question mark now. The Launch image now appears and not the white screen. My Setup: I am using Swift 3.1 with Xcode 8.3.1. In LaunchScreen.storyboard I added a simple image view and stretched the image to fit the view controller. I set auto layout constraints Top/Bottom/Leading/Trailing space to superview to 0 - see image below:

You have to make sure that the file name of your image has a format like .png or .jpg at the end otherwise it will not work. Also, before adding your image, you have to make sure that the image file is in your "Assets.xcassets" folder within your project. This can be done with a simple drag and drop. Also, make sure when you've added your image to your storyboard that the image name in the top left also matches the real image file name. I would try looking into Constraints too. Hope this helps. Good luck with your App.

此问题与资产相关。Xcassets修复它，你必须添加图像作为资源，但不是在Xcassets文件夹，然后应该工作得很好

在我的例子中，我有一些视图仍然链接到视图控制器那现在只是一个基本的视图控制器。如果我控制点击视图，我可以看到带有警告的出口，然而，警告并没有出现在Xcode中，这就是为什么我很难找到它们。