How to Create a Property Wrapper

Wrap common logic in a reusable property wrapper.

Steps

Paste the code into a Swift file or playground.
Run it once to verify the output.
Adjust the inputs to match your use case.

Copy and paste

import Foundation

@propertyWrapper
struct Clamped {
    private var value: Int
    let range: ClosedRange<Int>

    init(wrappedValue: Int, _ range: ClosedRange<Int>) {
        self.range = range
        self.value = min(max(wrappedValue, range.lowerBound), range.upperBound)
    }

    var wrappedValue: Int {
        get { value }
        set { value = min(max(newValue, range.lowerBound), range.upperBound) }
    }
}

struct Settings {
    @Clamped(0...100) var volume: Int = 120
}

print(Settings().volume)

Notes

Keep functions small and focused for reuse.
Prefer safe APIs like optionals and guards.