非常令人沮丧。最终成功的解决方案:

是否硬重启设备 删除应用程序 从Xcode安装app

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

我的问题。

原因:我在拖拽到Xcode后重命名了图片。 解决方案:在拖拽到Xcode后不要重命名图像。这给理解Xcode带来了问题。在拖动或添加到Xcode之前重命名图像。

希望它能帮助你!

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.

我也摆弄了好几个小时。但我现在找到解决办法了。您需要将图像添加到项目和资产中。Xcassets通过拖放。

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: