cocoa objective c

Objetive-C learning _ Block learning notes, objetive-c_block Block: an anonymous function with an automatic variable (local variable. Block: used to save a piece of code and can be called when appropriate. Block essence: struct, which contains a function pointer Block application scenarios: animation, multithreading, set traversal, and network request callback Block format: ^ return value type parameter li

instancevi. Relationship between OC instance object class object meta-Object(1) Each object is an instance of a class.(2) Each object has a pointer to the object named Isa, which points to its class.(3) Each class describes the characteristics of a series of its instances, including a list of member variables, a list of member functions, and so on.(4) Each object can accept the message, and the message list that the object can receive is saved in the class it corresponds to. Copyright NOTICE: T

Some time ago, during sokcet communication under Objetive-C, when the C ++ program was used as the server, everything was normal. When Java was used as the server, neither party received the data, after reading some documents, sort out the notes 1. Press enter and line feed at the end of the message. When Objetive-C sends data, add "\ r \ n" to the end" _ Datatosend = [nsdata datawithbytes: "This is a

atomic operation. If multipleWhen a thread calls the setter at the same time, one thread does not appear before the entire setter statement is executed, and the otherWhen a thread starts executing a setter, it is the same as the method ends with a lock.Nonatomic: The atomicity of Setter/getter is not guaranteed, and data may be problematic in multithreaded situations.nonatomic, non-atomic access, non-synchronous, multi-threaded concurrent access improves performance. First release the originalv

Ooa-ood-oop IntroductionI. OOA OOA: (object-oriented Analysis, object-oriented parsing method). is to analyze the problem according to the object-oriented thought after conducting the system business investigation in a system development process. There is a big difference between OOA and structu

Note: This article comes from " what is Ooa in Java?" What is Ood? What is OOP? "In Java, what is OOA? What is Ood? What is OOP?OoaObject-oriented Analysis: An object-oriented analytical approachis to analyze the problem according to the object-oriented thought after conducting the system business investigation in a system development process. There is a big difference between

1. OOA (object-oriented analysis): Object-Oriented Analysis Method OOA refers to the analysis of problems based on the object-oriented thinking after the system business investigation is conducted during system development. There is a big difference between OOA and structured analysis. OOA emphasizes the classification

Objective Most of the time, we only have access to OOP, for the Java Core Foundation, OOP thought in the moment of stepping into Java has been engraved on theBrain, but what is OOA? What is Ood? These concepts, can not see touch, usually do not pay attention to, at first glance what thingI've never heard of it. But these conceptual things really should be understood. The so-called thought controls human behavior.Ooa:object-oriented Analysis: An object

OoaObject-oriented Analysis: An object-oriented analytical approachis to analyze the problem according to the object-oriented thought after conducting the system business investigation in a system development process. There is a big difference between OOA and structural analysis. OOA emphasizes the analysis and collation of the material for the OO method based on the systematic investigation data, rather th

Review OOA, OOD, OOPOoaObject-oriented Analysis: An object-oriented analytical approachis to analyze the problem according to the object-oriented thought after conducting the system business investigation in a system development process. There is a big difference between OOA and structural analysis. OOA emphasizes the analysis and collation of the material for th

OoaObject-oriented Analysis: An object-oriented analytical approachis to analyze the problem according to the object-oriented thought after conducting the system business investigation in a system development process. There is a big difference between OOA and structural analysis. OOA emphasizes the analysis and collation of the material for the OO method based on the systematic investigation data, rather th

Object-Oriented Analysis This article studies problem domains and user requirements, and uses object-oriented perspectives to discover objects related to system responsibilities in the problem domains, as well as the characteristics and relationships of objects. The goal is to build a OOA model that maps problem domains directly and meets user needs. Object-Oriented Design Based on the OOA model, the

Reprint Address: http://javajiao.iteye.com/blog/152956 This is a story: "The engineer built a tunnel at one end of the tunnel that was beautiful, and many people would drive through the tunnel. Although there are lights in the tunnel, the designer is worried that the tunnel will stop, so there is a sign at the entrance of the tunnel, Remind the pilot to turn on the light before entering the tunnel. But it made the pilots forget about the lights when they saw the beautiful scenery.Draw the under

Part 1:Software Development Process Overview-Head first OOA DReading Notes(1) In the first part(Http://www.cnblogs.com/lihongchao/archive/2008/01/12/1036586.html), Briefly introduces a typical process of software development, that is, the so-called lifecycle. to build a software project, all the steps here are essential, not to say that these steps are indispensable, but the specific work contained in them will certainly be taken into account, eit

Code Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--> Take the name, phonenumber, and age fields as an example. Input data in the text box on the iPhone, load the data into the array, and write

GCD: A solution to the parallel operation of the Apple for multi-coreGCD automatically manages the life cycle of threads (create threads, schedule tasks, destroy threads)Queue: Used to hold tasks (serial queue, parallel queue)Task: What action to

Risks everywhereIn the previous article, we wrote a list of features. Then, can I analyze the requirements? Unfortunately, we still have a lot of work to do. The first thing after getting the feature list is to minimize risks. Here we will not give

Analysis phase: Establish a clear view of business problem domains List the core tasks that must be completed by the System Create a public vocabulary for the problem domain List the best solutions for this problem domain Design phase: How to

1. What is polymorphism? Object-orientedProgramAnother important concept in design is polymorphism. At runtime, you can call methods in the derived class by pointing to the base class pointer. You can put a group of objects in an array and call

Three steps for developing excellent software: 1,Develop the desired Software First, the software must meet all user needs. When the developed software has not completed the basic requirementsOO princleIt will be a waste of time to add and change