Saving a starting speedo reading in SwiftUI

UI Frameworks SwiftUI
Ghard123 OP
Created Sep ’22
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I want to save the start speedo reading that a user inputs to a textField. I know how to set the @State property but am not sure how to save the Speedo reading and prevent the entry of a different reading in the future. Can anyone help please??

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Saving a starting speedo reading in SwiftUI
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