CBUUID instantiation

cbuuid.swift

extension CBUUID {
    var type: UUID {
        return UUID(rawValue: uuidString)!
    }
    
    enum UUID: String {
        case main = "xxx"
        
        case measure = "3749FA03-4CED-524B-33D5-F00FD858C4F2"
        case alert = "3749FA05-4CED-524B-33D5-F00FD858C4F2"
        
        var cbuuid: CBUUID { return CBUUID(string: self.rawValue) }
    }
    
    static func common(_ type: UUID) -> CBUUID {
        return type.cbuuid
    }
}

// usage
peripheral.discoverServices([.common(.main)])
print(CBUUID(string: "xxx").type == .alert)

cbuuid2.swift

import Foundation
import CoreBluetooth

struct CBDevice {
}

extension CBUUID {
    static var device: CBDevice { return CBDevice() }
}

/*
extension CBUUID: ExpressibleByStringLiteral {
    typealias StringLiteralType = String
    
    init(stringLiteral value: String) {
        self = CBUUID(string: value)
    }
    init(unicodeScalarLiteral value: String) {
        self = CBUUID(string: value)
    }
    init(extendedGraphemeClusterLiteral value: String) {
        self = CBUUID(string: value)
    }
}
 */

extension CBDevice {
    var uuid: UUID.Type { return UUID.self }
    
    enum UUID: String {
        case main = "3749FA00-4CED-524B-33D5-F00FD858C4F2"
        
        case info = "3749FA01-4CED-524B-33D5-F00FD858C4F2"
        case config = "3749FA02-4CED-524B-33D5-F00FD858C4F2"
        case measure = "3749FA03-4CED-524B-33D5-F00FD858C4F2"
        case protection = "3749FA04-4CED-524B-33D5-F00FD858C4F2"
        case alert = "3749FA05-4CED-524B-33D5-F00FD858C4F2"
        
        var cbuuid: CBUUID { return CBUUID(string: self.rawValue) }
    }
}

extension CBUUID {
    var type: CBDevice.UUID? {
        return CBDevice.UUID(rawValue: uuidString)
    }
}


let service = CBMutableService(type: CBUUID.device.uuid.alert.cbuuid, primary: true)
service.uuid.type

CBUUID.device.uuid.alert