object property Manipulation-ios

#import <Foundation/Foundation.h> @class Author, @interface books:nsobject{     @private    nsstring *color;    int book_id;    NSString *box;    Author *author;    Nsarray *relationbook;    float price;    @public    nsstring *name;    } @property (nonatomic) int size;-(void) Setbox: (NSString *) box;-(NSString *) box;-(NSString *) method; @end

#import "Books.h" @implementation books@synthesize  size=_size;-(void) Setbox: (NSString *) _box{    Box=_box;} -(NSString *) box{    return box; -(NSString *) method{    return @ "This method can be called by [], or by point syntax;} @end

#import <Foundation/Foundation.h> @interface author:nsobject@property (nonatomic,copy) nsstring *name; @end

#import "Author.h" @implementation author@synthesize name=_name; @end

        Books *book=[[books alloc] init];        When the property is public, it can be manipulated by pointers, KVO,KVC operation Book->[email protected] "ISO development";        NSLog (@ "%@", book->name);        [Book setvalue:@ "iphone" forkeypath:@ "name"];                NSLog (@ "%@", [Book valueforkey:@ "Name"]);        When the attribute is private, the Get,set method can be generated by the property and synthesize, and then the book.size=12 is manipulated by the point syntax or by invoking the automatic generation method;        NSLog (@ "%d", book.size); [book setsize:14];//automatically generated set method NSLog (@ "%d", [book size]);//auto-generated Get method [book Setvalue:[nsnumber Numberwithint:        2323] forkeypath:@ "size"];                NSLog (@ "%@", [book valueforkey:@ "Size"]);        When the property is private, it can be generated manually and then manipulated by point syntax or by invoking the method NSString *[email protected] "The contents of the book";        Book.box=content;        NSLog (@ "%@", Book.box);         [Book Setbox:content];        NSLog (@ "%@", [book Box]);        [Book setvalue:@ "forkeypath:@" box "];        NSLog (@ "%@", [Book valueforkey:@ "box"]);   Declares that the normal method can be called by point syntax or [] call NSLog (@ "%@", [book Method]);     NSLog (@ "%@", Book.method);        When the property is private, it is possible to access//-----property for normal type operation via KVO,KVC, [book setvalue:@ "Android Development" forkey:@ "name"];        [Book setvalue:@ "Whilte" forkey:@ "color"];                NSLog (@ "%@:%@", [Book valueforkey:@ "name"],[book valueforkey:@ "color"]);        ----property for custom object Operation Author *author=[[author alloc] init];        [email protected] "Caicai";        [Book Setvalue:author forkey:@ "author"];        Author *author2=[book valueforkey:@ "Author"];                NSLog (@ "%@", author2.name);        ----property for custom object Operation 2--Object--Path access [book setvalue:@ "Caitou" forkeypath:@ "Author.name"];                NSLog (@ "%@", [Book valueforkeypath:@ "Author.name"]);        ----property for custom object operation 2--Object array--path access Nsmutablearray *relationbook=[nsmutablearray Arraywithcapacity:3];            for (int i=0; i<3; i++) {Books *book=[[books alloc] init];            NSString *name=[nsstring stringwithformat:@ "job_%d", I]; [Book Setvalue:namE forkeypath:@ "name"];            [Book setvalue:@ (12+i) forkeypath:@ "Price"];        [Relationbook Addobject:book];        } [book Setvalue:relationbook forkeypath:@ "Relationbook"];        Nsarray *names=[book valueforkeypath:@ "Relationbook.name"];        NSLog (@ "%@", names);         KVC simple operation sum max avg Count NSLog (@ "%@", [Book valueforkeypath:@ "[email protected]"]);        NSLog (@ "%@", [Book valueforkeypath:@ "[email protected]"]);        NSLog (@ "%@", [Book valueforkeypath:@ "[email protected]"]);         NSLog (@ "%@", [Book valueforkeypath:@ "[email protected]"]);