另一个属性的Swift类属性

class MyClass {
    static var count: Int = 0
    
    class var description: String {
        return "This is a class property."
    }
}

// 访问类属性
print(MyClass.count) // 输出: 0
print(MyClass.description) // 输出: This is a class property.

// 修改类属性
MyClass.count = 10
print(MyClass.count) // 输出: 10

// 子类重写类属性
class MySubclass: MyClass {
    override class var description: String {
        return "This is a subclass property."
    }
}

print(MySubclass.description) // 输出: This is a subclass property.