cocoa objective c

Description 1At the beginning of this project, the only description we get about the system we want to do is a one-page Word document, which is a simple description. There is only one line in the document: we need a system that enables agents and

Examine the verbs and nouns in your use case and point out that the behavior of classes and methods is called text analysis. A good use case uses a language that is easy to understand, clear and accurate to express system behavior Pay attention to

in the objective world and their interrelationships, and establishes a hierarchical world model of object-oriented and message-based. The object-oriented program design method is based on the above object-oriented world model.2.2 Object-oriented analysis (OOA)OOA emphasizes that the object in the OOA model is set up directly for the objective things in the probl

Is it Attribute or Property? Sometimes it is troublesome. Attribute and Property can be translated into "Attribute". In some cases, Attribute is used to represent "Attribute", and in some cases Property is used. Beginners often "lose" between these two words ", I even think there is no difference between the two, but they are the same. However, Attribute is not equal to Property. What is the difference between the two? Let's start with OOA/OOD (Obje

. The two are essentially different, one is a property, a field to access the class, and the other is an attribute that identifies the additional nature of the class, method, and so on.is a Attribute , or is Property ? Attribute and property can be translated into "attributes", some places with attribute to express "attributes", and some places in the use of roperty, beginners often in these two words "lost", and even think that there is no difference between the same. But attribute is not equa

of object-oriented analysis (OOA), Object-oriented design (OOD), and object-oriented programming (OOP).Object-Oriented analysis (OOA )The first part of object-oriented approach in object-oriented analysis, the task of this part is to set up the whole object-oriented software development base by abstracting the problem and the understanding of the project into normative object and message passing. This part

properties and methods as private, only the necessary behavior is set to public. Object-oriented English full name object oriented, referred to as OO. Oo actually includes OOA (object Oriented analysis, OO parsing), OOD (object oriented design, OO), and OOP (Object oriented programming, Object-oriented programming). A typical OO programming process should be to collate the requirements, according to the requirements of

, and skills to solve the problem. Even beginners can easily master the layout of Div + CSS, create exquisite webpages, and build powerful websites. (19th). UML and pattern applications This book is a practical guide to Object-Oriented Analysis and Design (OOA/D), and describes the content of iterative development. If you are new to OOA/D, you will face the challenge of mastering this complex topic. T

Part 1: Introduction to OOAD 2 Objectives What we will learn: Introduce oo concepts. Compare and contrast analysis and design. Define object-oriented analysis and design (OOA/d ). Revoke strate a brief example. 3 What is object technology? A set of principles (Billing action, Encapsulation, Polymorphism) Guiding Software Construction, Together Ages, databases, And other tools that Support those Principles. (Object Technology- Manager's guide, Taylor,

. Property has many advantages over using member variables directly. For example, data verification can be performed before values are assigned or read, and event triggering methods can be easily provided. Of course, you can also provide read-only or write-only attributes.The introduction of attributes allows us to add some information or constraints when designing methods, attributes, and events. This makes programming easier. In C #, property and attribute are two very well-differentiated co

The first step of OOA D is to understand user needs and convert them into business use cases. Note the following three points: 1. Business Use Cases focus only on the use cases from the perspective of system business, rather than the use cases provided by the system. Business Use Cases focus on "What business should the system implement" rather than "What functions the system provides "; 2. Business Use Cases only include the content that the cu

dynamic concepts and classes are static concepts. The object-oriented approach emphasizes the use of ideas and principles that people often use in everyday logic, such as abstraction, classification, inheritance, aggregation, encapsulation and so on, which enable software developers to think more effectively.2.2 Starting from OOAThe object-oriented approach involves the analysis (OOA) and Design (OOD) that have consistent concepts, principles, and pr

module, and the coding principle makes the program flow concise, clear, and enhance readability.2. Object-oriented approachThe object-oriented approach is to simulate the objective world from the internal structure, whose basic idea is that the object is the description of the objective entity of the real world, which is composed of its attributes and related operations, and is the basic unit of the system description. The object-oriented approach emphasizes the use of methods and principles co

project size is so large that it is difficult for developers to grasp the quality of the code effectively. Thus, the idea of top-down coding is put forward, through the decomposition of the original problem, people do not need to face the large-scale complex system directly, but each time only need to care about a local problem. For such a local problem, you can design the module to solve (in practice, often use the function to implement the module).Figure 2 Top-down decomposition taskObject-or

. Object-oriented approachWhen it comes to object-oriented methods, we have to mention object-oriented, so what is object-oriented? Object-oriented refers to a programming paradigm, and also a method of program development. An object refers to a collection of classes. It takes the object as the basic unit of the program, encapsulates the program and data to improve the reusability, flexibility and extensibility of the software. Object-oriented approach is based on object concept, Object-centric,

, finally, I had to give up. What a pity! As a result, I was not aware of such a problem. The manager asked me at the time whether there was a way to develop quickly.CodeA tool that can be used after a few modifications. Unfortunately, at that time, I did not know about the content. Later I learned UML, but when I read other books very early on, I mentioned UML in the book. Now is the real start. Preface: (in some of the original articles in the book, the "I" below is the author himself. Wu.

Before you learn JavaScript object-oriented programming, you need to know and understand some of the basic common sense of object-oriented. Most of the beginners think that object-oriented programming is very important and takes up a great part of the effort. I have previously thought that OOP is the main object-oriented part, then I hold the same idea, the following first to correct this idea, really understand object-oriented.First, the initial knowledge of object-orientedObject-oriented is di

), and Structured programming (SP. Correspondingly, the object-oriented methods include Object-Oriented Analysis (OOA) and Object-Oriented Design (OOD) and object-oriented programming language (OOP ). There are many connections and differences between the two software development methods from origin, thought, analysis, design, program design, extension reuse, and application, next, I will make a comparative analysis of the two. The two methods have th

memory pool for that thread6.When retain count increase?When will memory count increase?Answer: See iOS face question (i)7.What is commonly used NSObject class methods?Which methods of class nsobject are often used?Answer: NSObject is the base class of Objetive-c, which is composed of NSObject class and a series of protocols.Class methods Alloc, Class, Description object Methods init, Dealloc, –performselector:withobject:afterdelay: etc. are often us

Refer: [1] Reference Database: programming guide for Memory Management Assign a pointer P1 to another P2, that is, P2 = p1. In fact, P1 and P2 point to the same instance object. Any operation on P1 will affect P2, because they point to the instance objects of the same address. If you need to copy an object, instead of assigning values to pointers, you can use the copy constructor in C ++ to implement this function. Objetive-C is implemented through t