OBJECTIVE-C Study Notes

Super class

That is, the parent class can call the superclass method through [Super SetName: @ "a"]

Composite

Refers to an object that consists of several other objects

Object initialization

@interface*engine;)@end@implementation  Car-(ID)　　init{  if(self =new]; }  return//init@end

To get the superclass to complete the desired one-time initialization, you need to invoke [Super Init]. Assigning the result of [super Init] to self is the standard practice of OC. Prevents the superclass from returning objects that are not the same as the objects originally created during initialization.

#import

1, import the system header file with <>, import the project local header file with ""

2, A.M. implementation need to #import "A.H"

3, @interface, A.M. can use @class Engine to tell the compiler will know what this is, implementation still need #import. #import会告诉编译器类的详细信息, and @class will only tell you that this is a class. The #import loop-dependent reference will be an error, and @class will not, a reference b,b reference a. You cannot use @class to reference a superclass in a subclass, because the compiler does not yet know the superclass information.

OBJECTIVE-C Study Notes