Swiftui with delegate functions for mkmapview and uitextfield

To dismiss the keyboard when pressing return button in TextField, you can use:

UIApplication.shared.keyWindow?.endEditing(true)

Calling it on TextField's onCommit method:

TextField($searchString, placeholder: Text("Search...")) {
     UIApplication.shared.keyWindow?.endEditing(true)
   }
   .font(.system(size: 23))
   .padding()