SwiftUI Text Field Integer/Decimal Problem - ios

Question

I'm trying to suss out a problem I'm having. Basically, I have a text field for medical lab values, and I want it to display a symbol when out of range (out of normal medical limits) and another symbol when within normal range. These values are then used in formulae in another view in the app.
This is now my second post on this platform, so please forgive any posting faux pas, I'm trying to adhere to the rules as best as possible re: minimum reproducible and making sure my code is formatted properly in the posting. Here's what I have so far:
import SwiftUI
struct EntryMRE: View {
#Environment(\.managedObjectContext) private var viewContext
#State private var showingResults: Int? = 1
#FocusState private var isTextFieldFocused: Bool
#State var isDone = false
#State var isSaving = false //used to periodically save data
#State var saveInterval: Int = 5 //after how many seconds the data is automatically saved
//DataPoints Chemistry
#State var potassium = ""
var body: some View {
List {
Section(header: Text("🧪 Chemistry")) {
Group {
HStack {
Text("K")
+ Text("+")
.font(.system(size: 15.0))
.baselineOffset(4.0)
Spacer()
TextField("mEq/L", text: $potassium)
.focused($isTextFieldFocused)
.foregroundColor(Color(UIColor.systemBlue))
.modifier(TextFieldClearButton(text: $potassium))
.multilineTextAlignment(.trailing)
.keyboardType(.decimalPad)
if potassium != "" && Int(potassium) != nil {
if Int(potassium)! >= Int(Double(Int(3.5))) && Int(potassium)! <= Int(Double(4.5)) {
Image(systemName: "checkmark.circle.fill")
.foregroundColor(Color(UIColor.systemGreen))
}
else {
Image(systemName: "exclamationmark.circle.fill")
.foregroundColor(Color(UIColor.systemRed))
}
}
}
}
}
}
}
I've tried making it >= Double(3.5) which then pops the same error and says it should be Int(Double(3.5)) which does allow the code to build, but doesn't actually display the symbol when in range with a decimal (ExhibitA), only with a whole integer. (ExhibitB)
I've added some pictures that'll hopefully help show what I mean.
Thanks in advance!

Answer 1

This fails because you are converting a Double to an Int and vice versa and casting your String to an Int instead of a Double. You are loosing your digits when you do this.
Try:
if let numberValue = Double(potassium) { // Cast String to Double
if (3.5...4.5) ~= numberValue { //Check if casted value is in customRange
Image(systemName: "checkmark.circle.fill")
.foregroundColor(Color(UIColor.systemGreen))
}
else {
Image(systemName: "exclamationmark.circle.fill")
.foregroundColor(Color(UIColor.systemRed))
}
}