KVC

1、先建一個Person類和Book類

@class Book;

@interface Person :NSObject <NSCoding>

@property (strong,nonatomic)NSString *name;

@property (assign,nonatomic)NSInteger age;

@property (assign,nonatomic)double height;

@property (strong,nonatomic)Book *book;

@end

@interface Book : NSObject

@property (strong,nonatomic)NSString *bookName;

@property (assign,nonatomic)double price;

@end

2、在別的.m文件中使用

    self.person = [[Personalloc]init];

    self.person.book = [[Bookalloc]init];

    

    [self.personsetValue:@"lili"forKey:@"name"];

    [self.personsetValue:@"20"forKey:@"age"];

    [self.personsetValue:@"200"forKey:@"height"];

    

    [self.personsetValue:@"ios"forKeyPath:@"book.bookName"];

    [self.personsetValue:@"11.5"forKeyPath:@"book.price"];

    

    NSLog(@"%@",self.person.book);