在我的情况下，我必须选择两个复选标记:

用作启动屏幕 是初始视图控制器

在重新启动Xcode后，清理构建和一些关于这个问题的其他建议。对我来说，真正解决问题的是重新启动设备。(我在这上面浪费了一个多小时)

我想这只是表明，老话说你关闭了它，然后再打开它仍然适用于最新的小玩意!

如何重启iPhone XS或iPhone XS Max

快速按下并释放音量增大按钮 快速按下并释放音量调低按钮 按住侧边键，直到苹果logo出现

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.

xCode中的资源缓存似乎有一些问题。有同样的问题，重新启动xCode和一切工作正常之后。

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

在我的情况下，重置模拟器的内容和设置解决了这个问题。