class self

After learning the C language, today began the study of OC language, the main learning today is the OC in the description of the class and inheritance.1. Definition and use of classRight-click on the folder and select New File ... -cocoa class-The

In a class, self can only be used in a function, which represents an instance property, where each instance can be set to be worthless without affecting each other.If you use a property that does not have self at the class level, it is a class

Transfer from http://blog.csdn.net/windyitian/article/details/19810875A relatively simple English, the focus is to explain meta-class. Translate, deepen understanding.Original title: What's a meta-class in objective-c?Original address:

recently encountered a feature is based on the user's current network, users do not need to prompt the Internet, if it is WiFi can recommend some picture news, if the 3G mode is set to no Diagram mode, access to network status is relatively simple,

On this day, we will consider using php (as the mainstream development language) for singleton. We will see a comprehensive summary of several implementations of the singleton mode. the summary of php (as the mainstream development language) 5

The static keyword is described in a class where member properties and member methods are static, and where are the benefits of static members? Before we declare the "person" of the human beings, in the class "people" if we add a "human state"

1. The core idea of object-oriented program design is data abstraction, dynamic binding and inheritance.Inheritance: roots are called base classes, and inherited classes are called derived classes. A derived class must explicitly indicate which base

Python special member methods for reflection and classes, python reflection Member Reflection Reflection refers to four built-in functions: getattr, hasattr, setattr, and delattr to obtain members, check members, set members, and delete

A static member is a class variable that you can think of as belonging to an entire class and not to an instance of a class. Unlike a typical instance variable, a static member retains only one variable value, and the value of that variable is valid

son‘ has no initializers-‘Person‘ 类没有实例化器sCause: If a required attribute is defined in a class, you must allocate space for these required properties through the constructor and set the initial value 重写The constructor of the parent class

Details on how to bind attributes and methods to classes and instances in python, and python examples Preface When calling python and instance methods, you may feel confused. After thinking, you can record your thoughts to deepen your understanding

JAVA 28th (Common Object API)-String class Multithreading has come to an end. You need to back up common object APIs !!! Developed in the future, the most common object is text, or string. String type A string is a special object. The string cannot

Basic python tutorials-some object-oriented concepts, basic python tutorials Python uses classes and objects to program object-oriented (OOP. The main purpose of object-oriented is to improve the reuse of programs. The reason for getting started

Https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/ObjCRuntimeGuide/Articles/ocrtTypeEncodings.htmlhttp://blog.csdn.net/windyitian/article/details/19810875A relatively simple English, the focus is to explain meta-class. Translate,

BKJIA exclusive Article] There are too many slots on the Internet about the comparison between Ruby and Python, but I have not found any useful discussions, because we always argue about the functional differences between the two sides, it makes no

Java Origin, Development, features, working methods, composition of development systems, technical applications, java technical applications 1. Origin of java Oak (poor portability) ------> Java (platform portability not fixed) 2. Java

Look at the code:@implementation son:father-(ID) init{ = [Super init]; if (self) { } return to self ;}What is self and what is super ?In dynamic methods : Self stands for "object"; In static methods : Self stands for "class"; One

16, provide "all-round initialization method"Provides an all-in-one initialization method in the class and is indicated in the document. This method should be called by the other initialization methods.If the almighty initialization method differs

Mr. Mak introduction: In Learning PHP object-oriented programming ideas, we will encounter a lot of automatic call magic method, each magic method has its own specific triggering scenario, but its fundamental purpose is to write and actual use of

Programming Paradigm　　programming is a programmer with a specific syntax + data structure + algorithm composed of code to tell the computer how to perform the task of the process, a program is a programmer in order to get a task result and a set of