《OC基础教程》读书笔记2-面向对象

接口

以@interface开始，@end结束

@interface Circle:NSObject{

int radius;

NSString* fillColor;

}

-(void)setRadius:(int)r;

-(void)setFillColor:(NSString*)color;

-(void)draw;

@end;

//:NSObject表示该类继承自NSObject;

//{}中放实例变量，没有实例变量可省略，这与很多语言不一样！

实现

@implementation Circle

-(void)setRadius:(int)r{

radius = r;

}

-(void)setFillColor:(NSString*)color{

fillColor = color;

}

-(void)draw{

NSLog(@"this radius is %d",radius);

NSLog(@"this fillColor is %@",fillColor);

}

@end;

实例化

id c = [Circle new];

[c setRadius:3];

[c setFillColor:@"red"];

[c draw];