Introduction to the run-time mechanism

Introduction to the run-time mechanism

Runtime

Runtime is everything between your each function call!

The OBJECTIVE-C program can interact with the runtime system at three different levels:

The POBJECTIVE-C source program P calls the run-time function directly through the method P defined in the NSObject class

In most cases, the runtime system works only behind the scenes, primarily for writing and compiling objective-c source programs

Find the runtime documentation in the online Help

Oc/c/c++ the compilation process

Use Clang to rewrite. m files as CPP files

Open Terminal

PCD project file directory PCLANG-REWRITE-OBJC Main.mpopen main.cpp

Tip: To understand the underlying implementation mechanism, the easier The rewrite code is, the better

Runtime Walkthrough--getting an array of object properties

String Assignment

Objc_msgsend

Class_copypropertylist

About Arc & MRC

ARC is the retain and release of the object at run time without the need for programmer involvement

Apple's compiler developers have done countless tests on the arc and can say that there is little memory management error with ARC

In addition, because of the additional optimization of the compilation, the arc code is much more efficient than the code that the programmer manages the memory manually.

Q & A

Introduction to the run-time mechanism