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方法声明:
方法调用:
*冒号也是方法名的一部分
*同一个类中不允许两个对象方法同名
练习
给Car类设计一个方法,用来和其他车比较车速,如果快返回1,慢返回-1,相同返回0
#import <Foundation/Foundation.h> @interface Car : NSObject { @public int speed; } - (int)compareSpeedWithOther:(Car *)other; @end @implementation Car - (int)compareSpeedWithOther:(Car *)other; { //speed //调用方法的speed //other->speed//访问传入的speed return speed - other->speed; } @end int main() { Car *c1 = [Car new]; c1->speed = 300; Car *c2 = [Car new]; c2->speed = 280; int a = [c1 compareSpeedWithOther:c2]; CSLog(@"a=%d", a); //输出20 }
匿名:(不推荐写)
int main() { Car *c; //定义指针 c = [Car new]; //创建对象,赋值给指针 //可以合成为一句:Car *c = [Car new]; [c run]; return 0; } //匿名 int main() { [Car new]->speed = 300; [[Car new] run]; //speed 为0 ,与上边无关系 return 0; }
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原文地址:http://www.cnblogs.com/IDRI/p/4944912.html