示例代码：
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ljTempModel = UserModel.init(userName: "sww", userID: 12, phone: "123", email: "deew")
ljTempModel?.ljArray.append("sww")
print("可选绑定前:\(ljTempModel?.ljArray)")
//可选绑定成功，然后赋值
if let modle : UserModel = ljTempModel{
modle.ljArray.append("123")
print("可选绑定后:\(String(describing: ljTempModel?.ljArray))")
print("\(modle.ljArray)可选绑定成功，然后赋值")
//此处modle 和ljTempModel有相同的内存地址空间，所以对modle添加“123”，就相当于对ljTempModel添加“123”，实际打印结果也是如此
}else{
//绑定失败
print("可选绑定失败")
}
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import Foundation
open class UserModel : NSObject {
var userName: String ///< store user's name, optional
var userID: Int ///< store user's ID
var phone: String? ///< store user's telephone number
var email: String? ///< store user's email
var responseData = NSMutableData()
var ljArray = Array<Any>()
// designated initializer
init(userName: String, userID: Int, phone: String?, email: String?) {
self.userName = userName
self.userID = userID
self.phone = phone
self.email = email
super.init()
}
}
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原文链接：http://blog.csdn.net/robinson_911/article/details/74578789