zoukankan      html  css  js  c++  java
  • 第12月第26天 swift 下划线

    1.


    The _ is used to define that the parameter is not named

    If you have multiple _ it states that you do not need to name the parameters in your function call

    func myFunc(name:String, _ age:String){
    }

    myFunc(“Milo", "I'm a really old wizard")
    If you do not use the underscore you would use

    myFunc(“Milo”, age: "I'm a really old wizard")
    The _ is not necessary in function calls. It is just used to indicate that something does not to have a name.

    In regards to how you would refer to your function, You would not have to pass any name for the function call.
    But since you also don’t define a parameter type this seems to me like a invalid example (it at least doesn’t work in xCode 7 with swift 2.0)

    Edit:
    Since swift 3.0

    myFunc(name: “Milo”, age: "I'm a really old wizard")
    Should be used

    http://www.cnblogs.com/bhlsheji/p/4746072.html

    https://stackoverflow.com/questions/30876068/what-is-in-swift-telling-me

    2.

    // Set up the quad vertices with respect to the orientation and aspect ratio of the video.

    CGRect vertexSamplingRect = AVMakeRectWithAspectRatioInsideRect(self.presentationRect, self.layer.bounds);

  • 相关阅读:
    Spring IOC 源码解析
    spring AOP之代理模式
    HashMap的工作原理

    数据结构 (1)----线性表
    php简单的查找当前目录下的非法文件
    Js中Prototype、__proto__、Constructor、Object、Function关系介绍 ,JS原型
    js的变量,变量作用域,作用域链
    JS的类型转换
    sql 的join
  • 原文地址:https://www.cnblogs.com/javastart/p/7594951.html
Copyright © 2011-2022 走看看