关于使用@property @synthesize的语法

#import<Foundation/Foundation.h>

#import"Ppoint.h"

@interface Shape : NSObject {

@protected

floatwidth;

floatheight;

}

@property(nonatomic)float width,height;

- (id) initWithWidth : (float) _width Height : (float) _height ;

-(float) area;

-(void) draw;

@end

--------------------------------------------

#import"Shape.h"

@implementation Shape

@synthesize width,height;

- (id) initWithWidth : (float) _width Height : (float) _height

{

if(self = [superinit])

{

width = _width;

height = _height;

}

returnself;

}

-(float) area

{

returnwidth * height;

}

-(void) draw

{

NSLog(@"这是父类的绘图方法");

}

@end//Shape.h

主要是代码中加粗和加下划线的部分，他取代了平时写的setXxx和getXxx的用法

至于@property(参数)中参数到底写什么：请参考：http://blog.rapeflower.com/property-synthesize.html