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

最后，重启电话对我有用!!

我在这个问题上花了好几个小时。尝试过更改图像名称，删除整个图像资产，修改信息。plist，重新启动Xcode，甚至试图设置所有的图像属性(你可以看出我是多么绝望)。

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:

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。

在投入了大量的时间后，我得到了解决方案:-

Step 1:- Quit Xcode
Step 2:- Delete the app from device/simulator
Step 3:- Restart your device (if you are using simulator then you have to quit simulator)
Step 4:- Clear all derived data 
Step 5:- Clear Bin
Step 6:- Open Xcode and relaunch the app, it will work