objective c delegate

First of all, we should all understand that the Commission is a kind of agreement, as the name implies, is to entrust others to help themselves to do something. That is, when you do something inconvenient, you can create a delegate, so you can entrust others to help themselves to achieve what method.Secondly, I briefly summed up the role of the delegate I used to have two, one is the value of the transfer,

1. What is a commission? In fact, I have been thinking about how to explain the Commission, so that the Commission can be more thorough. To be honest, everyone is commissioned to have different opinions, because the point of view of the problem is different. Personally, it can be understood from the following 2 points: (1) In terms of data structure, a delegate is a user-defined type like a class. (2) In terms of design patterns, delegates (classes

I have been engaged in OC work for more than a year now, and I have learned a lot from the "protocol" that I first came into contact with OC, to the delegation and protocols that can be seen everywhere in the code.First, we should understand that delegation is a type of agreement. As the name suggests, it is to entrust others to do something for themselves. That is, when it is not convenient for you to do anything, you can establish a delegate so that

Introduction: The previous topic has shared with you why I need to delegate in C #. The topic briefly introduces what delegation is and simple application of delegation, in this topic, we will further introduce the delegation. This topic mainly discusses the nature of the Committee and the delegation chain. I. Nature of delegation Usually we can easily use delegation-use C #DelegateDefine delegation with keywords, and then useNewOperator to construct

In the C # version prior to 2.0, the only way to declare a delegate was to use a named method. C # 2.0 introduces an anonymous method (delegate), and in C # 3.0 and later, LAMBDA expressions replace anonymous methods as the preferred way to write inline code. Anonymous Delegate (method):Anonymous delegation is not an accurate term, it should be called anonymous m

SummaryDelegation is a very important concept in C # programming, and it is also a difficult point. This article will explain the system details of the delegation.1. What is a delegate?In fact, I have been thinking about how to explain the Commission in order to make the delegation more thorough. To tell the truth, everyone has a different opinion because of the angle of the problem. Personally, it can be understood from the following 2 points: (1) fr

The secret behind Delegate On the surface, using delegate is quite simple.Use the delegate keyword to define an instance, use the old new Method to create an instance, and use the familiar method call method to call the instance, but not the method name, but the delegate name. But behind this, the CLR has done a lot fo

C # differences between delegate and event, In general, a delegate is a class that maintains a field internally and points to a method. An event can be considered as a delegate type variable. Multiple delegates or methods can be registered or canceled through the event. This document describes the differences between the two methods by

Definition : Delegate It is a type of method reference stored in an object, and also a type of safe function pointer. One way to understand delegation can regard the role of delegation as specifying a name for the method signature. The delegate definition is similar to the method definition, but there is no method body. The keyword delegate must be added before

SummaryDelegation is a very important concept in C # programming, and it is also a difficult point. This article will explain the system details of the delegation.1. What is a delegate?In fact, I have been thinking about how to explain the Commission in order to make the delegation more thorough. To tell the truth, everyone has a different opinion because of the angle of the problem. Personally, it can be understood from the following 2 points: (1) fr

DelegatePreface: C#1 already has the concept of entrust, but its complicated usage does not arouse much attention of the developer, in the c#2, some compiler optimizations are made, and an anonymous method can be used to create a delegate. At the same time, the conversion of method groups and delegates is also supported. By the way, the covariance and contravariance of delegates are increased in the c#2.Method Group ConversionsThe meaning of a method

Not long ago, I gave the students training about C # Language delegation. It took me one day. The delegate is introduced to the LINQ expression. However! The students did not respond very well. It seems that you have not thoroughly understood the process. I wrote this article. This is a summary for the students! What is delegation? In fact, we can understand the delegate as an object that contains one or

Valid C # Principle 21: Delegate the callback Item 21: Express callbacks with delegates Me: "Son, weed in the yard. I want to read books ."SCOTT: "Dad, I have cleaned the yard ."SCOTT: "Dad, I have already put the grass on the render server ."SCOTT: "Dad, the host cannot be started ."Me: "Let me start it ."SCOTT: "Dad, I'm done ." This simple interaction shows the callback. I gave my son a task and he could report the status to interrupt me. Whi

delegate, which occupies a very important place in C # programming, a delegate can encapsulate a function into a delegate object, and multiple delegates can be merged into a delegate, which can be stored, passed, and invoked as normal objects, so that the implementation of the function callback mechanism in C # is esse

parameterless member function:myuobject* MyObj = NULL; // This assumes the creation of Myuobject if (MYOBJ) { = Mygamemode->oninitialize (). Adduobject (MYOBJ, myuobject::testfun); } Note: Any uobject normal function can be set to the callback function of the event, but if the function is ufunction, you need to replace Adduobject with addufunction.3, triggering event, here is assumed to be triggered in Beginplay:void Amygamemode::beginplay () { initevent.broadcast (); } 4, r

One, what is an event delegate?When it comes to event delegation, the event mechanism of JavaScript is first mentioned. In JS, it is divided into DOM level 0 events and DOM Level 2 events. Let's see what is a dom0 level event:The disadvantage of DOM level 0 events is that events written after you bind multiple events to an object overwrite the first-written eventThe following are the DOM2 level events:DOM Level 2 Events:AddEventListener (' Event type

1. First we need to construct a class for transmitting data and hosting the callback functionFor example: (custom constructs as needed)1 usingUnityengine;2 usingSystem.Collections;3 4 //callback function5 Public Delegate voidWarningresult ();6 Public classWarningmodel:monobehaviour7 {8 //callback function9 PublicWarningresult result;Ten //Warning Text One Public stringvalue; A - //construct a warning structure body - Publ

Defines a proxy for other objects to control access to this object Class diagram Generic Code Abstract topic class public interface Subject {public void request ();} Real topic class Public classes Realsubject implements Subject {@Overri De public void request () {//Specific business process}} proxy class public class Proxy implements Subject {//To delegate which implementation class private Subject Subject = n ull; Default by proxy public proxy

The delegate function in. Net is similar to the method pointer in c or c ++. It can call the delegate to complete a function like calling a method, or return a certain type of result. However. net is a more advanced language, and the Delegate is also more advanced. The Delegate is a data interface that contains the poi

Preface Once upon a while, the source code of Microsoft products was just a fantasy, but now it has become a reality, and Microsoft finally opened its products to the outside world.Source codeIt is always a good thing to let us get a glimpse of the secrets of excellent products by throwing away the old-generation hatred between the open-source movement and Microsoft and the original intention of Microsoft. Two days ago, I saw a comment in the essay, saying that he thought ". the Design Patte