클레스 정의Classes Are Blueprints for ObjectsBasic Syntax@interface SimpleClass : NSObject// do something@end Properties Control Access to and Object's Values@interface Person : NSObject @property NSString *firstName;@property NSString* lastName;@end -> 이것도 알아 두기 @property NSNumber *yearOfBirth;@property int yearOfBirth;@property NSInteger myInteger; Property Attributes Indicate Data Accessibility an..