After the releases of SwiftUI and Apple’s new betas (macOS 10.15, iOS 13, and Xcode 11), I began developing an application built on the new technologies.
Development had gone smoothly, considering all the software and systems involved were in beta. However, upon trying to run the SwiftUI-based app on a real device (iPhone 8 Plus, running iOS 13 beta 2), the application refused to start, instead crashing on launch with a simple (lldb) in the Xcode debugger. The app had worked properly in the simulator, and Xcode has provided no helpful messages as to why the app will not run on a real device.
tl;dr after running successfully in the iOS 13 simulator, SwiftUI app crashes on launch on real iOS 13 device.
Thanks in advance!
Thanks to matt!
It turns out the issue was just a bug in Xcode 11 beta 1, preventing SwiftUI-based apps from being testing on real devices. Upgrading to Xcode 11 beta 2 resolved the issue.
来源：https://stackoverflow.com/questions/56654995/ios-13-swiftui-app-crashes-upon-launch-on-real-device