gistfile1.swift

enum Size: Int {
    case L = 1
    case M = 2
    case S = 3
}

var size: Size? = nil
    
func onSizeSelected(size: Size) {
    self.size = size
}
    
func onSizeCleared() {
    self.size = nil
}
    
@IBAction func onSendButtonTouched() {
    if let size = self.size {
        send(size)
    } else {
        // Dialog.show("サイズを選択してください")
    }
}

func send(size: Size) {
    // Post.request(url,parameter:["size" : size.rawValue]).execute()
}