Objective-C

Parsing xmlin this paper, for example, to parse local XML, the return value obtained by the network can only be converted into NSData type, and parsing is the same The XML file that needs to be parsed is as follows, Users.xml user

This example for you to share the Objective-c translucent navigation of the specific implementation code for your reference, the specific contents are as follows #define KSCREENWIDTH [[UIScreen mainscreen] bounds].size.width #define

There are three ways to implement regular expression matching in iOS. Now record them all here: 1. Using nspredicate (predicate) matchingFor example, to match a valid mailbox: NSString *email = @ "nijino_saki@163.com"; nsstring *regex = @ "

Objective-c class, instance member, static variable, object method, class method (static method), object, First, the class In iOS, the declaration of a class is separated from its implementation, that is, it

Let's assume that we've created a class today. We are named MyObject and inherit from NSObject.Inheritance know, it is you this subclass (MyObject) assumes that nothing is written, and the parent class (NSObject) is exactly the same. Almost all of

Objective-c is similar to object-oriented languages such as C + +, Java, but in many ways different. If you use another object-oriented language, you can understand many of the paradigms and templates used by objective-c. However, the syntax may

There is only a things in computer science:cache invalidation and naming things.There are only two difficult things in computer science: Cache invalidation and naming. –phil Karlton Computer language is the medium of communication between

Synchronous Asynchronous Parallel Serial Task Group Time to wait There are two types of Dispatch queues: 1.Serial Dispatch queue, serial queue, can only perform one of the tasks that are appended to the thread at a

I. Polymorphism1. Polymorphism concept, definitionWhat is polymorphism: polymorphism is the multiple forms of a certain class of things;Representation: Animal *ani = [Dog new];Polymorphic conditions: 1. There is an inheritance relationship 2.

////Student.h//OOP////Created by acgity on 16/5/16.//copyright©2016 year acgity. All rights reserved.//#importtypedefenum{Male,female} SEX;@interfacestudent:nsobject{@publicNSString*_name; int_age; SEX _sex;}+(void) walk;-(void) Talk;-(instancetype)

Summary: nil is used to assign values to objects (any object of object-c is of type ID), NULL assigns any pointer, null and nil are not interchangeable, nil is used for class pointer assignment (in OBJECT-C class is an object, is an instance of

Variable group construction method //The definitions of the two sentences below are immutable //Nsmutablearray *marray1 = [[Nsarray alloc]init];//Nsmutablearray * marray1 = @[@ "xx", @ "yy"];     // default array has no elements nsmutablearray *

Compounding:Composition in programming (composition) is like composing music (composition): Combine multiple components together to use them to get a complete work. In Objective-c, a composite is implemented by including an object pointer that is an

The copies between objects in the objective-c are divided into shallow and deep copies. Plainly, a shallow copy of a non-container class is the address of the copied object, and the contents of the object are still a copy, and no new memory is

Today I used some of the usual strings in my project, so I created a constant.h file that was defined by # define.Later on the internet to see the big gods are recommended to use string constants to define, so I have all the macro definitions are

First, the Knowledge point1. Introduction to Data selection controls Uipickerview and date selection controls Uidatepicker controls* Case of Uipickerview* Ordering System* City Selection* Flag Selection* Case of Uidatepicker* Introduction and basic

Objective-c PropertiesApple introduced properties, a combination of new compiler directivesand a new attribute accessor syntax.Apple introduced the concept of attributes. New compiler commands and new attribute access syntax.1.1 Shrinking The

Objective-c Chapter 1 Hello World1.11.2.On The Welcome screen, click "Create a new Xcode project" (see Figure 2-1), or just chooseFile->new->new Project.1.3. Write the following code in main#import int Main (int argc, const char * argv[]) {

As with C and C + +, Objective-c also uses the header file and the implementation file (implementation files) to partition the code. The standard way to write "class" in the Objective-c language is to create two files with the name of the class name,

Most of the features in the runtime are described in the previous sections, including the processing of classes and objects, member variables and properties, methods and messages, classification and protocols. Most of the runtime's functions are