objective c delegate

On the Windows platformProgramIn design, events are an important concept. In almost all Windows applications, a large number of asynchronous calls are involved, such as responding to and Clicking buttons and processing Windows system messages, all these asynchronous calls must be completed through events. It is no exception even on the next-generation development platform --. net. So what is an event? An event is a message sent from an object. The message indicates a specific action or a speci

There are several outstanding features of JQuery's event binding:1. Can bind an unlimited number of processing functions2. Events can be delegated to an ancestor node, not necessarily tied to the corresponding node, so that the added node can be processed as well.3. Chain-Operated　　The following is the principal analysis of the event's delegate design. The event source we become the delegate node, the

Title delegate and event in C #sam1111 (original) keywords. NET, C # Event is a very important concept in windows-based program design. Because in almost all Windows applications, there are a lot of asynchronous calls involved, such as responding to click Buttons, handling Windows system messages, and so on, which need to be done in the way of events. Even in the next generation development platform ——. NET is no exception. So what is an incident? A

Preface: The previous article introduced the next multi-threaded knowledge: C # Basic series-Multi-threading common use of the details, which refers to the delegate variable. This article briefly describes the use of the delegate. Of course, many of the articles commissioned in the garden will say: The concept of the Commission and the event is like a barrier, the person who passed the threshold, it is real

What is a delegate first to know what a delegate is, in the most understandable words, you can think of a delegate as a thing to execute a method (function). How to use a delegate when you use a delegate, you can treat it as if you were a class. It is declared first, then in

Encapsulates a method that has only one parameter and does not return a value.namespaces: SystemAssembly: mscorlib (in mscorlib.dll)GrammarC#public delegate void ActionType parameter In T The parameter type of the method encapsulated by this delegate. This type parameter is contravariant. That is, you can use a specified type or a lower-derived type. For more information a

Original http://www.cnblogs.com/skm-blog/archive/2013/05/24/3096294.html Delegation plays an extremely important role in C # programming. A delegate can encapsulate a function into a delegate object, and multiple delegates can be combined into one delegate, the delegate object can be stored and transferred like a norma

Original address http://www.tracefact.net/CSharp-Programming/Delegates-and-Events-in-CSharp.aspx thank Bo Master share!IntroductionDelegates and events are widely used in the. Net framework, however, a good understanding of delegates and events is not easy for many people who are not in touch with C # for a long time. They are like a sill, the person who passed the threshold, think it is too easy, and not the past people every time to see the Commission and events feel the heart Don't (Biè) pani

Delegate and event in C # Event is an important concept in Windows-based programming. In almost all Windows applications, a large number of asynchronous calls are involved, such as responding to and Clicking buttons and processing Windows system messages. These asynchronous calls must be completed through events. It is no exception even on the next-generation development platform --. net.So what is an event? An event is a message sent from a

Let's look at an example:A person has three sons, asking them to take one thing out and bring back one prey.It can be understood as a father's commitment to his son:Prey method (Tool)The methods for entrusting the three members are different.Rabbit hunting (Tool bow)Buy pheasant (Tool money)Wolf Trap (Tool trap)What is delegation?A delegate is a type used to indicate all methods in the same form (the return values are of the same type and parameters a

1. Sort the classpublic class Bubblesorter {static public void sortBOOL swapped = true;do {swapped = false;for (int i = 0; i if (comparison (sortarray[i + 1], Sortarray[i])) {T tmp = Sortarray[i];Sortarray[i] = sortarray[i + 1];Sortarray[i + 1] = tmp;swapped = true;}}} while (swapped);}}2. Define a method for comparing datapublic static bool CompareValue (int x, int y){return x }3. Calling method OrderingilistBubblesorter.sort (ArraySort, CompareValue);for (int i = 0; i Console.WriteLine ("{0}",

The use of On () is recommended after jquery version 1.7$ (document). On ("click", "#green", function () {$ (the). After (' $ (document). Delegate ("#green", "click", Function () {$ (this). After (' $ ("#green"). Live ("Click", Function () {$ (this). After ('

JS Event Delegate

. getElementById ("UL");varOLi = Oul.getelementsbytagname ("Li")varOBTN =Document. getElementById ("Input");varInow =4;Oul.onmouseover= function (EV) {varEV = EV | | window.event; Event source, regardless of the event, as long as the element you are manipulating is the source of the eventvar Target= Ev.targe | | Ev.srcelement;if (EV.Target. nodename.tolocalelowercase () = ="Li"){Ev.Target.style.background="Red"}}Oul.onmouseout= function (EV) {varEV = EV | | window.event;var Target= Ev.targe | |

Copy Code code as follows: /** * Delegate Mode sample * * @create_date: 2010-01-04 */ Class PlayList { var $_songs = array (); var $_object = null; function PlayList ($type) { $object = $type. " Playlistdelegation "; $this->_object = new $object (); } function Addsong ($location, $title) { $this->_songs[] = Array ("Location" => $location, "title" => $title); } function Getplaylist () { return $this->_object->getplaylist ($thi

Copy CodeThe code is as follows: /** * Delegate Mode sample * * @create_date: 2010-01-04 */ Class PlayList { var $_songs = array (); var $_object = null; function PlayList ($type) { $object = $type. " Playlistdelegation "; $this->_object = new $object (); } function Addsong ($location, $title) { $this->_songs[] = Array ("Location" => $location, "title" => $title); } function Getplaylist () { return $this->_object->getplaylist ($this->_songs); } } Clas

Event Delegate Closed Package When to apply closures var li = 5; function my () { var t = N; Console.log (LI); 5 } my (); Console.log (t); The defined function can directly visit global variables, but it is impossible to access local variables outside of the function. The closure comes to the definition: A closure is a function that is called outside the scope of the function declaration at Thef () The scope of the function dec

(obtain market information, produce what product), only need to tell the secretary to send me a market report or we do not produce an atom bomb to turn to produce a hydrogen bomb. Then the secretary according to the command of the leadership of the choice to find which employee, and then the information returned to the leadership of the staff. The three employees are transparent to the leader, and the leader does not know who is executing the order. 4. How to define and use And then the examp

1. Delegation Overview In short, the delegate is to pass the method as a parameter. A delegate is a type of dynamic calling method. It is referenced in the same way as classes, interfaces, and arrays. In C #, you can declare the delegate type, create a delegate instance, and encapsulate methods in the

A delegate is a special class that encapsulates the operation objects and specified methods during calls. The constructor of the Delegate. Two parameters, target and methodPtr, are required to specify the object and method of the operation respectively. The call of the delegate uses the Invoke method. The prototype and delega