iOS Learning Journey--oc Object relationships

1. Anonymous object: There is no moniker
1. Anonymous objects are used only once
Usage scenarios:
1. Anonymous objects can be used when we want to invoke only one method of an object at a time

2. The anonymous object can be used as the actual parameter of the function

 #import <Foundation/Foundation.h> #import "CZPerson.h" #import "CZBook.h" @ Interface czbook:nsobject@end@implementation czbook@end@interface czperson:nsobject{int _age;//age NSString *_na me;//name}//Write method setter-(void) Setage: (int) age;//Read method getter-(int) age;-(void) SetName: (NSString *) name;-(NSString *) NA me;-(void) Readbook: (Czbook *) book; @end @implementation czperson//Write Method setter-(void) Setage: (int) age{_age = age;} Read method getter-(int) age{return _age;} -(void) SetName: (NSString *) name{_name = name;} -(NSString *) name{return _name;}    -(void) Readbook: (Czbook *) book{} @endint main (int argc, const char * argv[]) {[[Czperson new] setage:10]; /* 1, first create an anonymous person object 2, call the Readbook Method 3 of the person object that you just created, and pass in an anonymous Czbook object [Czperson new] To create an anonymous human object [Czbook        New] Creates an anonymous book object */[[Czperson New] Readbook:[czbook new];            NSLog (@ "%d", [[Czperson new] age]); return 0;} 

2. Dependency Relationship:
A object is a local variable of the B object or a method, B depends on a, and we call A and B a dependency relationship.
In object-oriented design:
Coupling degree: When changing an object. The degree of influence on another object
Low coupling: When changing an object's impact on other objects is relatively small
High cohesion: An object that only does its own related things
Object-oriented design principles: a single responsibility principle

#import <Foundation/Foundation.h> @interface czbeauty:nsobject{nsstring * _name;//name}-(void) SetName: (nsstring *) name;-(NSString *) name;/** * Call local tyrants */-(void) Calltuhaowithphone: (Czphone *) phone;-(void) sendmessagetodiaosi;@e Nd@implementation czbeauty-(void) SetName: (NSString *) name{_name = name;} -(NSString *) name{return _name;}    /** * to local tyrants call, the object as the form of the */-(void) Calltuhaowithphone: (Czphone *) phone{NSLog (@ "to local tyrants called"); [Phone call:@ "Local tyrants's phone number"];}       -(void) sendmessagetodiaosi{NSLog (@ "Send a message to the cock");//object as a local variable of another class Czphone *phone = [Czphone new]; [Phone sendmessage:@] Oh, do you want me to watch a movie? "];} @end @interface czphone:nsobject/** * Texting * * @param message content */-(void) SendMessage: (NSString *) message;/** * Power Word */-(void) Call: (NSString *) phonenum; @end @implementation czphone/** * Text message * * @param message message content */-(void) sendmess Age: (NSString *) message{NSLog (@ "Send a%@ message", message); /** * Calling */-(void) Call: (NSString *) phonenum{NSLog (@ "GivePhone number for%@ people call ", Phonenum);} @endint Main (int argc, const char * argv[]) {//Create a beauty czbeauty *beauty = [czbeauty new];//Create a phone czphone *phone        = [Czphone new];     [Beauty setname:@ "FBB"];        [Beauty Calltuhaowithphone:phone];        [Beauty Sendmessagetodiaosi]; return 0;}

3. Association relationship (multiple files)
Hasa relationship: When an object has another object,
When the A object is a member variable of the B object,
An association relationship exists between a object and a B object


Association relationships are most often used in object-oriented relationships
---------------------------------------------------below to learn about
The coupling degree of correlation relation is higher than the dependence relation

One-on-one: unilateral dependence, bilateral dependence
One-to-many relationship: classes and students, a class can have more than one student
Many-to-many relationships: students and courses. A student can learn multiple courses, a course is taught by multiple students

#import <Foundation/Foundation.h> #import "CZBeauty.h" #import "CZNewBeauty.h" int main (int argc, const char * argv[    ]) {Czbeauty *beauty = [Czbeauty new];        Czipad *ipad = [Czipad new];    Cznewbeauty *newbeauty = [Cznewbeauty new];        [NewBeauty Setipad:ipad];    [NewBeauty Lookatmovie];    [NewBeauty Listentomusic];    [NewBeauty PlayGame];        [NewBeauty Takeselfphoto]; return 0;} #import <Foundation/Foundation.h> #import "CZIPad.h"/* When we always use an object in a class as a formal parameter, we will extract the parameter as a member variable */@interface czbeauty:nsobject//use ipad to watch movies-(void) Lookatmoviewithipad: (Czipad *) ipad;//use ipad to listen to music-(void) Listentomusicwithipad: ( Czipad *) ipad;/** * Beauty play game */-(void) Playgamewithipad: (Czipad *) ipad;/** * beauty selfie */-(void) Takeselfphotowithipad: (Czipa d *) ipad, @end #import "CZBeauty.h" @implementation czbeauty//to watch movies with ipad-(void) Lookatmoviewithipad: (Czipad *) ipad{NSL OG (@ "Beauty wants to see a movie!")
"); [ipad Playmovie];} Use ipad to listen to music-(void) Listentomusicwithipad: (Czipad *) ipad{NSLog (@ "Beauty to listen to music!")    "); [ipad playmusic];} /** * Beauty play game */-(void) Playgamewithipad: (Czipad *) ipad{NSLog (@ "Beauty wants to play the game!")
"); [ipad playGame];} /** * Beauty selfie */-(void) Takeselfphotowithipad: (Czipad *) ipad{NSLog (@ "Beauty is going to take a selfie!")
"); [ipad Takephoto];} @end #import <Foundation/Foundation.h> @interface czipad:nsobject//play Movie-(void) playmovie;//play music-(void) playmusic;//Play Game-(void) playgame;//photography-(void) Takephoto; @end #import "CZIPad.h" @implementation czipad//play Movie-(void) playmovie{NSLog (@ "ipad play movie"); Play music-(void) playmusic{NSLog (@ "ipad play Music");} Play games-(void) playgame{NSLog (@ "ipad play Game");} Photo-(void) takephoto{NSLog (@ "ipad selfie");}  @end #import <Foundation/Foundation.h> #import "CZIPad.h" @interface cznewbeauty:nsobject{//let Belle have an ipad Czipad * _ipad;} Writing method. Buy a ipad-(void) Setipad: (Czipad *) ipad;//Watch movie-(void) lookatmovie;//listen to music-(void) listentomusic;/** * Beauty play Games */-(void) PLAYG ame;/** * Beauty selfie */-(void) Takeselfphoto; @end #import "CZNewBeauty.h" @implementation cznewbeauty//Write method, buy a ipad-(void) Setipad: (Czipad *) ipad{_ipad = IPad;}    See the movie-(void) lookatmovie{NSLog (@ "Beauty watch movie"); [_ipad Playmovie];}    Listen to music-(void) listentomusic{NSLog (@ "Beauty listens to Music"); [_ipad Playmusic];} /** * Beauty Play game */-(vOID) playgame{NSLog (@ "Beauty play Game"); [_ipad playGame];}    /** * Beauty selfie */-(void) takeselfphoto{NSLog (@ "beauty selfie"); [_ipad Takephoto];} @end

Learning experience:

Through the corresponding examples, proficiency in object-oriented, for future learning to lay a good foundation

iOS Learning Journey--oc Object relationships