Swift_运行时获取class的属性

    class func propertyList() -> [String] {
        var count: UInt32 = 0
        //获取类的属性列表,返回属性列表的数组,可选项
        let list = class_copyPropertyList(self, &count)
        print("属性个数:\(count)")
        //遍历数组
        for i in 0..<Int(count) {
            //根据下标获取属性
            let pty = list?[i]
            //获取属性的名称<C语言字符串>
            //转换过程:Int8 -> Byte -> Char -> C语言字符串
            let cName = property_getName(pty!)
            //转换成String的字符串
            let name = String(utf8String: cName)
            print(name!)
        }
        free(list) //释放list
        return []
    }

class func guard_propertyList() -> [String] {
        var count: UInt32 = 0
        //1.获取类的属性列表,返回属性列表的数组,可选项
        let list = class_copyPropertyList(self, &count)
        print("属性个数:\(count)")
        for i in 0..<Int(count) {
            //使用guard语法,一次判断每一项是否有值,只要有一项为nil,就不再执行后续的代码
            guard let pty = list?[i],
                let cName = property_getName(pty),
                let name = String(utf8String: cName)
                else {
                    //继续遍历下一个
                    continue
            }
            print(name)
        }
        free(list)
        return []
    }