Add convenience to your SwiftUI Previews by using `.previewDevice(.iPhone12)` instead of initializing by String.

PreviewDevice.swift

import SwiftUI

extension PreviewDevice: Identifiable {

    public var id: String { rawValue } // Support for each loops over an array of Preview Devices

    static var iPhoneSE1: PreviewDevice { .init(.iPhoneSE1) }
    static var iPhone7: PreviewDevice { .init(.iPhone7) }
    static var iPhone7Plus: PreviewDevice { .init(.iPhone7Plus) }
    static var iPhone8: PreviewDevice { .init(.iPhone8) }
    static var iPhone8Plus: PreviewDevice { .init(.iPhone8Plus) }
    static var iPhoneX: PreviewDevice { .init(.iPhoneX) }
    static var iPhoneXs: PreviewDevice { .init(.iPhoneXs) }
    static var iPhoneXsMax: PreviewDevice { .init(.iPhoneXsMax) }
    static var iPhoneXʀ: PreviewDevice { .init(.iPhoneXʀ) }
    static var iPhone11: PreviewDevice { .init(.iPhone11) }
    static var iPhone11Pro: PreviewDevice { .init(.iPhone11Pro) }
    static var iPhone11ProMax: PreviewDevice { .init(.iPhone11ProMax) }
    static var iPhoneSE2: PreviewDevice { .init(.iPhoneSE2) }
    static var iPhone12mini: PreviewDevice { .init(.iPhone12mini) }
    static var iPhone12: PreviewDevice { .init(.iPhone12) }
    static var iPhone12Pro: PreviewDevice { .init(.iPhone12Pro) }
    static var iPhone12ProMax: PreviewDevice { .init(.iPhone12ProMax) }

    private enum iPhone {
        case iPhoneSE1
        case iPhone7
        case iPhone7Plus
        case iPhone8
        case iPhone8Plus
        case iPhoneX
        case iPhoneXs
        case iPhoneXsMax
        case iPhoneXʀ
        case iPhone11
        case iPhone11Pro
        case iPhone11ProMax
        case iPhoneSE2
        case iPhone12mini
        case iPhone12
        case iPhone12Pro
        case iPhone12ProMax
    }

    private init(_ iPhone: iPhone) {
        switch iPhone {
        case .iPhoneSE1: self = PreviewDevice(rawValue: "iPhone8,4")
        case .iPhone7: self = PreviewDevice(rawValue: "iPhone9,3")
        case .iPhone7Plus: self = PreviewDevice(rawValue: "iPhone9,4")
        case .iPhone8: self = PreviewDevice(rawValue: "iPhone10,4")
        case .iPhone8Plus: self = PreviewDevice(rawValue: "iPhone10,5")
        case .iPhoneX: self = PreviewDevice(rawValue: "iPhone10,6")
        case .iPhoneXs: self = PreviewDevice(rawValue: "iPhone11,2")
        case .iPhoneXsMax: self = PreviewDevice(rawValue: "iPhone11,6")
        case .iPhoneXʀ: self = PreviewDevice(rawValue: "iPhone11,8")
        case .iPhone11: self = PreviewDevice(rawValue: "iPhone12,2")
        case .iPhone11Pro: self = PreviewDevice(rawValue: "iPhone12,3")
        case .iPhone11ProMax: self = PreviewDevice(rawValue: "iPhone12,5")
        case .iPhoneSE2: self = PreviewDevice(rawValue: "iPhone12,8")
        case .iPhone12mini: self = PreviewDevice(rawValue: "iPhone13,1")
        case .iPhone12: self = PreviewDevice(rawValue: "iPhone13,2")
        case .iPhone12Pro: self = PreviewDevice(rawValue: "iPhone13,3")
        case .iPhone12ProMax: self = PreviewDevice(rawValue: "iPhone13,4")
        }
    }

}