I've ported my apps to Swift in the first year. Looking back it was not the best approach, but for new applications it makes perfect sense to start with swift only. Regarding SwiftUI, I will wait at least 1 year :).
I still maintain applications that were started in Swift 1.x. But it looks a lot more like my old Objective-C code, it really took a while before my approaches changed.
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I've ported my apps to Swift in the first year. Looking back it was not the best approach, but for new applications it makes perfect sense to start with swift only. Regarding SwiftUI, I will wait at least 1 year :).
I still maintain applications that were started in Swift 1.x. But it looks a lot more like my old Objective-C code, it really took a while before my approaches changed.