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This is a creation in Article, where the information may have evolved or changed. Today I'm going to teach you some useless skills, or you can call it artifice or black magic. Good use can improve performance, the use of bad will attract demons, hey. Introduction to Black Magic In order to let everyone learn the basic

This black magic should belong to OC, it is based on runtime implementation of bogus DAFA.So what is method swizzling? From the literal point of view is called the method of coordination, probably this means. Use this magic to replace an existing method with a custom method, a bogus, a rescue.Using the method is simple, the code is basically the following framewo

PHP black magic we learned in those years CollationHere we must talk about the importance of = and =. = Is a comparison operation. It does not check the type of conditional expressions === is constant. It checks whether the value and type of the query expression are equal to NULL, 0, "0 ″, when array () is compared with = and false, true is returned, but = is not the basic knowledge point that everyone shou

This article mainly introduces the python black magic encoding conversion and analyzes the python encoding conversion methods. interested partners can refer to this article to introduce the python black magic encoding conversion, this article analyzes the python encoding and conversion methods. if you are interested, r

Introduction Descriptors (descriptor) is a deep but important black magic in the Python language, which is widely used in the kernel of the Python language, and mastering the descriptor will add an extra skill to the Python programmer 's toolbox. In this article I will describe the definition of descriptors and some common scenarios, and at the end of the article I will add that the getattr getattribute get

Clang Attributes black Magic Little MemoryClang Attributes is a source code annotation provided by Clang, which allows developers to express certain requirements to the compiler, participate in control such as Static Analyzer, Name mangling, code Generation and so on, generally In __attribute__(xxx) the form of code; for ease of use, some commonly used properties are also defined by COCOA macro, such as the

This article mainly introduces the python black magic encoding conversion and analyzes the python encoding conversion methods. If you are interested, please refer to the code conversion process in libraries of other languages, for characters that cannot be understood, there are usually only two (or three) Types of processing ): Throw an exception Replace with a replacement character Skip However,

that is marked private, even if it is a subclass of NSObject. If we need to use the dynamic nature of these content, we need to manually add @objc modifiers to them.Adding a @objc modifier does not mean that the method or property will become dynamically distributed, and Swift may still optimize it for static invocation. If you need the same runtime attributes as the dynamic call in Objective-c, the modifier you need to use is the dynamic. In general, when doing app development should not be us

In my best friend's recommendation, I watched this video:The Black Magic of SSHIn this video, we introduce some of the advanced applications of SSH, and in combination with the experience of the work, two types of questions will help us a lot in our usual work:1. Two people how to see the same terminal interface2. How to do port forwarding with a single serverShell sharingYou can think of this as a characte

used on its own computer before. It is not as simple as ctypes. Of course, the main reason why I didn't use it was that I didn't want to include too many things during deployment. What we can see on Quora is not a black technology, but it feels interesting. turtle is a built-in library. ========================================================== ==================================== Add one that was recently seen: You need to assign values to the

Following the previous PHP version of the posture (different version of the use of features), the article summarizes the PHP version differences, and now in a local diary summary of the PHP black Magic, is used to do the CTF encountered and recorded, it is very suitable for the CTF code audit time to look over.One, the requirement variable original value is different but MD5 or SHA1 the same case1.0e all eq

Black Magic Collection for the creation of classes omit selfFrom types import functiontypefrom byteplay import Code, Opmapdef metaclassfactory (function): Class Metaclass (Type): def __new__ (Meta, classname, bases, classdict): For AttributeName, attribute in Classdict.items (): If type (attribute) = = Functiontype:attribute = function (attribute) newclassdict [AttributeName] = attribute retu

Recently found JavaScript garden this JS black magic collection, but there are some things are not very thorough, so while looking at the document or do experiments, write some notes, conveniently placed on the blog. After watching you don ' t know JS talk about this and prototype part, perhaps again will write a little.Function name is optionalWhere anonymous functions are usually used, anonymous functions

Http://soj.me/show_problem.php? Pid = 1001 cid = 10041001. Black MagicDescription Believe it or not, there is a powerful black magic, lost ted by Mage Philia, which will make one person fall in love with an OTAKU. needless to say, this is the ultimate goal for all of you. however, in order to learn this spell, you need to solve a problem first. First, Mage Phil

);Objc_setassociatedobject (self, bottomnamekey, [NSNumber Numberwithfloat:bottom], Objc_association_copy_ Nonatomic);Objc_setassociatedobject (self, leftnamekey, [NSNumber Numberwithfloat:left], objc_association_copy_nonatomic) ;}-(CGRect) Enlargedrect{nsnumber* TopEdge = Objc_getassociatedobject (self, topnamekey);nsnumber* Rightedge = Objc_getassociatedobject (self, rightnamekey);nsnumber* Bottomedge = Objc_getassociatedobject (self, bottomnamekey);nsnumber* Leftedge = Objc_getassociatedobjec

(Swizzledmethod), method_ Gettypeencoding (Swizzledmethod));if (Didaddmethod) { class_replacemethod (Class,swizzledselector,method_getimplementatino ( Originalmethod), method_gettypeencoding (Originalmethod)); }else{method_ Exchangeimplementations (Originalmethod,swizzledmethod); }} 8. In order to use the swizzled_viewdidappear we have written in the classification: replace the Viewdidappear: method in the controller. Use a more special method + (void) load. In general, the method in the categ

Split () Usage:#!/usr/bin/pythonstr = "Line1-abcdef \nline2-abc \nline4-abcd";p rint str.split ();p rint str.split (', 1);　　The result of the above example output is as follows:['line1-abcdef ',' line2-abc ',' LINE4-ABCD '][' Line1-abcdef ', ' \nline2-abc \nline4-abcd ']Points:1. Using split () without parameters, it treats all spaces (space characters, tabs, newline characters) as delimiters.2.filter (None, S.split ("))A = ' hello++world!+ ' #如何取得 ' hello ' and ' world '? >>>a.split (' + ')