swift – 我的myClass2中没有保留周期吗？

obj2和obj1是如此相似：
?它们都有一个名为printNameLength的属性,它们都是一个闭包,它都捕获自己(或者它是？).

但obj2得到了deinit(而obj1并不是因为有一个保留周期),它让我感到惊讶,我无法弄清楚为什么.

非常感谢.

class myClass1 {

    var name: String

    lazy var printNameLength: ( () -> Int ) = { // [unowned self]
        return self.name.characters.count  // retain cycle here
    }

    init(name: String){
        self.name = name
    }

    deinit {
        print("deinit myClass1: (name)")
    }

}

var obj1: myClass1? = myClass1.init(name: "obj1")
print(obj1!.printNameLength())
obj1 = nil    //  never get deinit



class myClass2{
    var name: String

    init(name: String){
        self.name = name
    }

    var printNameLength: ( () -> Int )?

    deinit {
        print("deinit myClass2: (name)")
    }
}

var obj2: myClass2? = myClass2.init(name: "obj2")
obj2!.printNameLength = {
    return obj2!.name.characters.count   // no retain cycle here?
}
print(obj2!.printNameLength!())
obj2 = nil   //  get deinit