为什么我的初始 ViewController 没有出现在模拟器上，只有 Hello World？

Question

I am following the Udemy Advanced iOS and Firebase tutorial. His tutorial is on ios 8 and I am on 10, plus I am on Xcode 11.3 and he is on 9 I think.

Anyway, I followed the tutorial and when I launch it I get an error about LaunchScreen cannot use custom classes. So I unchecked use as Launch Screen. This now allows the simulator to run, but when it does I don't see the app I have built. All is show is a white screen with "Hello World" on it?

For some reason when I created a Single View app in Xcode it only created a LaunchScreen.storyboard so that is where I built my UI. I have noticed other tutorials Xcode automatically creates the Luanch storyboard and the Main storyboard?

Answer 1

The reason why you see the "Hello, World!"is you have created a SwiftUI app

For Xcode 11

When creating a new Xcode project and the user interface option is selected as SwiftUI as shown below

Then the initial project files will only contain the LaunchScreen.storyboard and the other files listed below. To configure the UI one needs to write SwiftUI code in the ContentView.swift

When creating a new Xcode project and the user interface option is selected as Storyboard as shown below

Then the initial project files will contain the LaunchScreen.storyboard and the Main.storyboard as shown below.