runtime

Objective-C中的runtime详解_1

﹥>﹥吖頭↗ 提交于 2020-01-07 17:40:40
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> Objective-C中的runtime详解 本文介绍自己用到过的或者遇到过的runtime函数, 持续更新中... 首先要想使用runtime中的函数, 必须引入 #import <objc/runtime.h> 头文件. 1.objc打头的方法 1.1 objc_getClass() OBJC_EXPORT Class objc_getClass(const char *name); 这个方法作用是根据类名字的字符串, 创建class进而可以创建对象. 如下代码所示: const char *className = [@"ViewController" UTF8String]; Class class = objc_getClass(className); id instance = [[class alloc] init]; NSLog(@"%@", [instance class]); 1.2 关联 /////////////////////////关联策略, 枚举类型的 typedef OBJC_ENUM(uintptr_t, objc_AssociationPolicy) { OBJC_ASSOCIATION_ASSIGN = 0, /**< Specifies a weak reference

vue学习笔记runtime-only和runtime-compiler

风格不统一 提交于 2020-01-07 16:10:53
一、 vue内部过程    1.首先将vue中的模板进行解析解析成abstract syntax tree (ast)抽象语法树   2.将抽象语法树在编译成render函数   3.将render函数再翻译成virtual dom 虚拟dom   4.将虚拟dom显示在浏览器上 二、 runtime-only和runtime-compiler的区别    runtime-only比runtime-compiler更快,因为它省略了vue内部过程中的第一个过程,如果是runtime-compiler   那么main.js中就会出现template从而需要过程一导致增加了一个过程,同时增加了大小 三、 runtime-only中的render函数 render函数 render:function(createElement){ //1.createElement('标签',{标签的属性},[标签中的内容]) returncreateElement('h2',{class:'box'},['hello word']) } render传入组件 render:function(createElement){ //1.createElement('标签',{标签的属性},[标签中的内容]) returncreateElement(组件对象) } //那么

Changing Class Variables in runtime?

若如初见. 提交于 2020-01-07 04:25:07
问题 Let me give an idea of what I wish to do: I have a structure or class called student , which contains variables like int roll_no and int reg_no If the user wishes to add a new variable like char name at run time how can it be done? 回答1: Based on the word "Structure" and the variable declarations, I'm going to guess this question is about some flavor of C. How exactly to do this will depend on the language, but as a general rule, if the language is compiled (e.g. C/C++, Java), this is not

How to close application when System.exit(0) does not works?

生来就可爱ヽ(ⅴ<●) 提交于 2020-01-07 02:17:22
问题 I have a application. On Close button click I am calling System.exit(0) . But on a machine it is not getting close that application. It is happening on few systems not all. I read some docs and forums and found that the exit() with 0 (zero) int value is used for normal exit . and normally this method never returns normally (means close the application). BUT if a security manager exists and its checkExit method doesn't allow exit with the specified status. My application is not creating any

this class is not key value coding-compliant for the key error

一曲冷凌霜 提交于 2020-01-06 20:34:26
问题 My problem is when I build the application it has this error Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<FirstViewController 0x717ea40> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key hourTimeOutOfBraceChanged.' Here is my header file #import <UIKit/UIKit.h> #import "Brace.h" @interface FirstViewController : UIViewController @property (weak, nonatomic) IBOutlet UILabel *timeOutOfBraceLabel; @property (weak, nonatomic)

Using jQuery tooltip at runtime by livequery

邮差的信 提交于 2020-01-06 17:47:28
问题 Does anybody know how to use tooltip at runtime using livequery? I found some infos, but for me it doesnt work. jQuery('.button').bind('click', function () { std(); }); function std () { jQuery('.abcd').livequery.run(function() { jQuery('.abcd').tooltip(); }); } 回答1: I interpret your code to mean this: When .button is clicked you want to enable the tooltip functionality on all elements with class .abcd . If this is your intention simply use jQuery('.button').bind('click', function () { std();

python3调用微软js引擎ChakraCore

佐手、 提交于 2020-01-06 15:40:34
有关ChakraCore介绍请移步: https://github.com/Microsoft/ChakraCore 使用案例GitHub源码: https://github.com/pyAppman/ChakraCore 本文主要讲下python调用ChakraCore.dll 参考文献有: https://xz.aliyun.com/t/2450 以及 https://bbs.125.la/forum.php?mod=viewthread&tid=14495171&highlight=ChakraCore python是解释性语言,网上能搜到的基本都是C、C#、C++、易语言的ChakraCore使用,并没有python使用方法,参考了上面大佬们的相关介绍使用以及官方文档,写了如下可以成功调用的python例子。之所以写这个是因为:第一,暂目前python用于执行js的工具有node,pyv8,js2py,windows系统下的com组件,node性能不好,v8不够全安装费劲不说,对python2更友好,js2py运行小js还可以,大了就不行了,com不够全面比不上node内置的js函数,也不能跨平台,ChakraCore综合了node的全面跟v8的性能,还能跨平台。第二、网上也有不少关于ChakraCore的文章,但是没有python的,而易语言,C,C+

Choose title- and file name at runtime

£可爱£侵袭症+ 提交于 2020-01-06 15:07:02
问题 I am trying to automate file upload in two browsers but the window name is "File Upload" in Firefox and "Open" in Chrome. I don't want to write two different scripts. How to choose title- and file name at runtime to achieve cross browser compatibility? I use Selenium and testNG, AutoIt only for file upload. 回答1: Set a variable based off the web browser being used, then use that variable. The code below should get you on the right track. $FirefoxUpload = "File upload" $ChromeUpload = "Open" if

change movieclip instance name in runtime

末鹿安然 提交于 2020-01-06 13:56:50
问题 I'm trying change movieclip instance name in runtime, with name property but I have error Error #2078: The name property of a Timeline-placed object cannot be modified. I tried to create new movieclip in runtime asign my old movie clip and change name property but I have same error... and is any way to change instance name of movieClip in runtime? 回答1: So far the only workaround I've found is to use an array: import flash.display.MovieClip; import flash.geom.ColorTransform; var t:Boolean; //

why we can't Serialize these objects?

女生的网名这么多〃 提交于 2020-01-06 08:23:29
问题 why we can't Serialize objects into Random Access file ? and on the other hand we can serialize objects into sequential access file ? ""C# does not provide a means to obtain an object’s size at runtime. This means that, if we serialize the class, we cannot guarantee a fixed-length record size "" (from the book that i read in). so we cannot read the the random access file because we don't know every object size in the file so how we could do seeking ?????? 回答1: Any object marked with the