object-c笔记一
(本笔记只是简单的记录,只给自己看)
接口的定义:
@interface Circle:NSObject{ShapeColor fillColor;ShapeRect bounds;}-(void)setFillColor:(ShapeColor)fillColor;-(void)setBounds:(ShapeRect)bounds;-(void)draw;@end?
?实现 :
@implementation Circle-(void)setFillColor:(ShapeColor)c{fillColor = c;} //setFillColor-(void)setBounds:(ShapeRect)b{bounds = b;} //setBounds-(void)draw{NSLog(@"drawing a circle at(%d %d %d %d) in %@",bounds.x,bounds.y,bounds.width,bounds.height,colorName(fillColor));}//draw?
?实例化:
int main(int argc,const char* argv[]){id shape[1]; //定义类型为id指针,长度为1名字为shapes的数组ShapeRect rect0 = {0,0,10,30}; //定义一个矩形并为其提交4个坐标点参数shape[0] = [Circle new]; //为数组第一个元素实例化一个Circle类[shapes[0] setBounds:rect0]; // 数组元素调用Circle类的方法[shapes[0] setFillColor:kRedColor];[shapes[0] draw];return (0);}?
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继承:Objective-C中只能继承一个类
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