Defining Classes

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Classes Are Blueprints for Objects

Basic 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 and Storage Considerations

all declare properties that are intended for complete public access.

@interface Person : NSObject

@property (readonly) NSString *firstName;

@property (readonly) NSString *lastName;

@end

Method Declarations Indicate the Messages an Object Can Receive

void SomeFunction(); 

-> - (void)someMethod;

-: for instance method, +: for static method

Methods Can Take Parameters

void SomeFunction(SomeType value); 

->  - (void) someMethodWithValue: (SomeType) value;

void SomdFunction(SomeType value1, SomeType value2)

-> - (void) someMethodWithValue: (SomeType) value1 secondValue:(SomeType) value2;

Class Names Must Be Unique

당연하지

Basic Syntax

#import "XYZPerson.h"

@implementation XMYPerson

@end

Implementing Methods

@interface XYZPerson : NSObject

- (void) sayHello;

@end

#import "XYZPerson.h"

@implementation XYZPerson

- (void)sayHello {

NSLog(@"Hello, World!");

}

@end