This document is about the first component of the development environment – the programming language. This document also provides the basis for understanding the second component, the Objective-C application framework (collectively called Cocoa). The runtime environment is described in a separate document “Objective-C Runtime Programming Guide”. If you have never used object-oriented programming to create an application, you should read Object Oriented Programming using Objective-C. If you have used other object-oriented development environments (such as C ++ or Java), consider various expectations and rules different from Objective-C, so please consider reading it. Object-oriented programming using Objective-C is designed to get used to object-oriented development from the perspective of Objective-C developers.

Objective-C is a simple computer language for the implementation of complex object-oriented software applications. Objective-C is defined by the small but powerful package of the ANSI C language standard, and added to C is based primarily on Smalltalk, one of the Object-Oriented programming languages. Objective-C is intended to provide an overall object-oriented programming capability and simplification. This document is the first part of the development environment. This document basics of exploring the second component of a C-C program called Cocoa. Programming instructions for the Objective-C program that is separately documented.

Objective-C is a very “thin” layer originally situated above C, an exact superset of C, allowing object-oriented programming combining dynamic / static type paradigm. The syntax of Objective-C is derived from C and Smalltalk. The syntax of preprocessing, expressions, function declarations, and function calls is inherited from C, and the syntax of object-oriented functions came from Smalltalk.

Objective-C derives its object syntax from Smalltalk. All syntax of non-object-oriented operations (including primitive variables, preprocessing, expressions, function declarations, function calls) are the same as C syntax, and the syntax of object oriented functions is Smalltalk implementation style messages.

Objective-C ++ is a version of the GNU and Clang compiler collection language that compiles source files using C ++ and the Objective-C syntax combination. Objective-C ++ adds an extension to C ++. Objective-C is added to C. In order to combine semantics beyond the various languages of the language, nothing is done, so some restrictions are:

C / C ++ is the most important way to find an effective way of exchanging code between iOS and Android: The C-code is easy to incorporate in the C-code base (C-purpose is extended in C) and the Objective-C compiler supports. Mix C ++ and Objective-C with the same purpose C ++ source file. On Android, Java supports Java / C + C ++ (such as native code) and supports Java code from JNI’s C / C ++ server.

Care must be taken because the destructor calling conventions of Objective-C and C ++ exception runtime models do not match (that is, if Objective-C exceptions exceed the scope of C ++ objects, destroying C ++ Will not be called). function). The new 64 – bit runtime solves this problem by introducing interoperability with C ++ exceptions in this sense.

Objective-difference between C and C ++ is different; each sender can not handle other types of exceptions. Exceptions-C’s exceptions are replaced by C ++ exceptions (Apple’s operating environment) or Goals-C ++ (GNUstep libobjc2).

Objective-C supports the operation of the radiation function, while C ++ adds a small support for time-consuming C. Objective-C whether to respond to specific messages if the object may ask the property for its own property. In C ++, it is not possible to use outside libraries.

The Objective-C runtime reference describes the data structure and functionality of the Objective-C runtime support library. The program can use these interfaces to interact with the Objective-C runtime system. For example, you can add classes and methods, and get a list of all the class definitions of loaded classes.

The Objective-C implementation uses a thin runtime system written in C, so the size of the application does not increase much. In contrast, most object-oriented systems are created with large virtual machine runtimes. Objective-C applications tend to be larger than similar C or C ++ applications because Objective-C dynamic types do not allow stripping or inline expansion.

Objective-C uses dynamic text-to-action during operation, and uses all method calls (or, in some cases, system calls), Objective-C methods (for example, insertion, regular distribution, interprocedural optimization, and replacement of scalar aggregates). It also limits the performance of C C objects for similar abstracks such as C ++.

All purpose-C applications using the above-mentioned extensions-C 2.0 are not compatible with all operating systems (Leopard) up to 10.5. Fast counting does not cause the exact same binary file with a standard number, so the software will crash the Mac OS X version 10.4 or earlier.

After purchasing NeXT in 1996, Apple Computer used OpenStep on Mac OS X, including Objective-C, NeXT’s C-development tools, Project Builder, and Interface Builder design tools. one application with Xcode. Most of the Apple API API is based on an OpenStep interface object and is the most important Objective-C system used for active development.

Objective-C is the core programming language of Apple’s OS X and iOS operating system. These are the general object-oriented programming language APIs, APIs, Cocoa and Cocoa Touch APIs. This handbook will be easy to learn Objective-C programming language and will guide you in practical ways.

Like Java, Objective-C can be used to write desktop and mobile software. However, Objective-C is Apple’s territory. Swift Objective-C is the language of development for iPhone and iPad until recently in the programming language. Many major tools are still in Objective-C, and programmers for these applications are highly-demanded. If you want to work with applications for iPhone or iPad, Objective-C will be happy to learn.

According to Wilkerson, the technology industry uses all four languages (C, C ++, C #, and Objective-C) (as noted above, Apple encourages learning Swift rather than Objective ). C). Indeed, Wilkerson said that all four languages can be used for crossover purposes. For example, Wilkerson says that C / C ++ / C # code for OSX can be written as needed. “Mixing these languages in a project is very common,” C # is as follows.

In early 2014 Apple opened an alternative version of the language “Objective-C” of the Swift programming language source. Goal-C was hard-to-master, but it was a Mac and was only available on platforms developed by Apple, but Swift did not depend on open source code and platforms. For Apple, it’s a test of the future of Swift MacOS and iOS platforms.

This is because Swift was only released in 2014 and feedback on it is generally very favorable, but there are still many iOS applications built using Objective-C, and documentation on Objective-C There are also a lot. As a professional iOS developer, you need to know how to maintain or modify your code.

Objective C is one of the main choices for application development, whether it is OSX or an iOS application. However, if Apple introduces Swift to compensate for all limitations of Objective C, it will immediately receive the impact of developers. Objective C is ideal for iOS applications, but Swift has found that it can add more advantages and additional features. These benefits include enhanced security and memory management. Applications developed using Swift are also rapidly popular platforms and are expected to be used for the future.

Android apps are traditionally developed in Swift and Objective-C on Java and IOS applications. However, there are many different tools that you can use instead. Xamarin, Native and Ionic are examples of these tools. What is their purpose? What makes them different? Which is the best? We will try to answer these questions in this article.

Developing for iOS means learning Objective-C or Swift. I have a frequently asked question “Do you learn Objective-C or learn Swift directly?” Answer: Why do you want to learn about mobile application development?

For beginners of iOS development, it is easy to learn Swift, the syntax is simple, and the function is superior to Objective-C, so you should first learn about Objective-C and Swift I strongly urge you to learn. The reason why learning Swift is not the best decision is that not everybody adapted to Swift from Objective-C. I would like to say that Apple has been very successful in using a new and powerful language to facilitate the development of iOS and OS X.

The programming language Objective-C was originally developed in the early 1980’s. It was chosen as the main language of NeXT of the NeXTSTEP operating system from which Mac OS X and iOS derive. Portable Object-C programs that do not use the Cocoa or Cocoa Touch library, or programs that may be ported or reimplemented for other systems, compile to any system supported by the GNU Compiler Collection (GCC) or Clang I can do it.


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