I am complete beginner so I am sorry if my question will sound dumb.. But where should I add the if statement in the actual app? All the tutorials I could find are either from the Xcode playground or aren't helpful at all.. Thanks in advance

I am trying to do something like this: (Basically I want the oneRepMax to be equal to weight if the number of reps is 1)

if reps == 1 {
    oneRepMax == weight
} else {
    oneRepMax = weight*(1 (0.0333*reps))-2
}

Here is my code:

//
//  ContentView.swift
//  overload
//
//  Created by / on 25.08.2022.
//
 
import SwiftUI
 
 
struct ContentView: View {
    
    @State private var weight = 1.0
    @State private var reps = 1.0
    
    var body: some View {
        VStack{
            Stepper("Reps : \(reps.formatted())", value: $reps, in: 1...10)
            
            TextField("Weight: \(weight.formatted())kg", value: $weight, format: .number)
                    .keyboardType(.numberPad)
        
            
            let oneRepMax=weight*(1 (0.0333*reps))-2
 
            Text(String(format: "Your 1RM is %.1f kg", oneRepMax, oneRepMax)).padding()
            
            
            Group { 
                Text(String(format: "Your 2RM is %.1f kg", oneRepMax/(1 (0.0333*2)) 2, oneRepMax/(1 (0.0333*2)) 2))                
                    
                Text(String(format: "Your 3RM is %.1f kg", oneRepMax/(1 (0.0333*3)) 2, oneRepMax/(1 (0.0333*3)) 2))
                    
                Text(String(format: "Your 4RM is %.1f kg", oneRepMax/(1 (0.0333*4)) 2, oneRepMax/(1 (0.0333*4)) 2))
                    
                Text(String(format: "Your 5RM is %.1f kg", oneRepMax/(1 (0.0333*5)) 2, oneRepMax/(1 (0.0333*5)) 2))
                    
                Text(String(format: "Your 6RM is %.1f kg", oneRepMax/(1 (0.0333*6)) 2, oneRepMax/(1 (0.0333*6)) 2))
                    
                Text(String(format: "Your 7RM is %.1f kg", oneRepMax/(1 (0.0333*7)) 2, oneRepMax/(1 (0.0333*7)) 2))
                    
                Text(String(format: "Your 8RM is %.1f kg", oneRepMax/(1 (0.0333*8)) 2, oneRepMax/(1 (0.0333*8)) 2))
                    
                Text(String(format: "Your 9RM is %.1f kg", oneRepMax/(1 (0.0333*9)) 2, oneRepMax/(1 (0.0333*9)) 2))
                    
                Text(String(format: "Your 10RM is %.1f kg", oneRepMax/(1 (0.0333*10)) 2, oneRepMax/(1 (0.0333*10)) 2))   
            }                
        }
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}
 

CodePudding user response：

try this example code:

struct ContentView: View {
    @State private var weight = 1.0
    @State private var reps = 1.0
    
    var body: some View {
        VStack{
            Stepper("Reps : \(reps.formatted())", value: $reps, in: 1...10)
            TextField("Weight: \(weight.formatted())kg", value: $weight, format: .number)
                .keyboardType(.numberPad)

            let oneRepMax = Int(reps) == 1 ? weight : weight*(1 (0.0333*reps))-2  // <-- here

            // -- here, no need for the second oneRepMax...
            Text(String(format: "Your 1RM is %.1f kg", oneRepMax)).padding()
            Group {
                // -- here, no need for the second oneRepMax...
                Text(String(format: "Your 2RM is %.1f kg", oneRepMax/(1 (0.0333*2)) 2))
                Text(String(format: "Your 3RM is %.1f kg", oneRepMax/(1 (0.0333*3)) 2))
                Text(String(format: "Your 4RM is %.1f kg", oneRepMax/(1 (0.0333*4)) 2))
                Text(String(format: "Your 5RM is %.1f kg", oneRepMax/(1 (0.0333*5)) 2))
                Text(String(format: "Your 6RM is %.1f kg", oneRepMax/(1 (0.0333*6)) 2))
                Text(String(format: "Your 7RM is %.1f kg", oneRepMax/(1 (0.0333*7)) 2))
                Text(String(format: "Your 8RM is %.1f kg", oneRepMax/(1 (0.0333*8)) 2))
                Text(String(format: "Your 9RM is %.1f kg", oneRepMax/(1 (0.0333*9)) 2))
                Text(String(format: "Your 10RM is %.1f kg", oneRepMax/(1 (0.0333*10)) 2))
            }
        }
    }
}

CodePudding user response：

All you need to do is create a computed property that returns the result you need, like so:

struct ContentView: View {
    
    @State private var weight = 1.0
    @State private var reps = 1.0
    
    private var oneRepMax: Double {
        if reps == 1 {
            return weight
        } else {
            return weight*(1 (0.0333*reps))-2
        }
    }

    var body: some View {
        ...
    }
}

Here, every time ContentView is redrawn, that is every time one of the @State properties changes, the oneRepMax property will be recalculated, staying up-to-date.