Objective-c Study Notes (i)

How to master a high-level programming language:(here specifically objective-c)

bottom-up thinking: down, how to think about the process of running the program from the bottom of the machine.

Focus on language constructs, compilation transformations, memory models, run-time mechanisms

Abstract thinking: upward, when the complexity of the software is high, the design needs to be abstracted into a code program.

Focus on object-oriented, component encapsulation, design patterns, architectural patterns

"Space-time Man" Trinity Analysis method:

Time: Complie-time VS run-time Time node division between compile time and run time

Space: Stack VS heap (heap) to differentiate stacks and heaps, because it determines the lifetime of the program

People: Programmer VS Compiler/runtime/framework distinguishes which code is written by itself and which is written by the compiler/runtime/framework.

Two kinds of development methods:

Compiler (clang or GCC) command line

Clang-fobjc-arc HELLOWORLD.M

Xcode Project

Develop in project units

must-see documents:

Programming with OBJECTIVE-C:

https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/ProgrammingWithObjectiveC/

iOS zone:

https://developer.apple.com/library/ios/navigation/

Apple Developer Conference WWDC

Practice:

1. Print out HelloWorld with clang compilation

* * Write HELLOWORLD.M

* * Enter the folder where the file is located on the terminal, input Clang-fobjc-arc helloworld.m-o Hello

Generate a hello file after compiling with the./hello to execute

2. Print out HelloWorld with Xcode compilation

Objective-c Study Notes (i)