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 

我有启动屏幕文件命名，但它不存在。当我删除这个我的发射图像出现。

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:

到目前为止，有视网膜设备可用，我忽略了Assets.xcassets中的@1x图像。

在我的情况下，我有应用程序的logo在启动屏幕是不可见的，当我运行应用程序。

在浪费了这么多时间后，我发现我只提供了@2x和@3x图像的标志图像。

通过添加该图像的@1x版本，可以解决此问题。

重新启动设备并清除x-code衍生数据