I have a sample SwiftUI iOS app. As shown in the screenshot below, my project has three configurations: Debug, MyDebug, Release. If I select the Debug or MyDebug scheme, I get a preview. But if I select the Release scheme, I get an error that says the following. ”***.app” needs -Onone Swift optimization level to use previews (current setting is -O) , where *** is the app name. It probably has nothing to do with the Preview error, but the Info.plist has a dictionary such that the key name is devMode, and the value is $(DEVMODE). And I have a user-defined setting as shown below. My ContentView has the following. import SwiftUI struct ContentView: View { @State private var state: String = var body: some View { VStack { Text(Hello, world!: (state)) } .onAppear { if let devMode = Bundle.main.object(forInfoDictionaryKey: devMode) as? String { print(Development mode: (devMode)) state = devMode } if let path = Bundle.main.path(forResource: Info, ofType: plist) { if let dict = NSDictionary(contentsO
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