方法
1.对象方法都是以减号 -
2.对象方法的声明必须写在@interface和@end之间
对象方法的实现必须写在@implementation和@end之间
3.对象方法只能由对象来调用
4.对象方法归类\对象所有
函数
1.函数能写在文件中的任意位置(@interface和@end之间除外)，函数归文件所有
2.函数调用不依赖于对象
3.函数内部不能直接通过成员变量名访问某个对象的成员变量
1: #import <Foundation/Foundation.h>
2:
3: @interface Person : NSObject
4: @end
5:
6: @implementation Person
7: @end
8:
9: @interface Car : NSObject
10: {// 成员变量\实例变量
11: //int wheels = 4; 不允许在这里初始化
12: //static int wheels; 不能随便将成员变量当做C语言中的变量来使用
13: @public
14: int wheels;
15: }
16:
17: - (void)run;
18: - (void)fly;
19: @end
20:
21: int main()
22: {
23: // wheels = 10;
24: /*
25: Car *c = [Car new];
26: c->wheels = 4;
27: //run();
28:
29: [c run];
30: */
31:
32: void test2();
33:
34: test2();
35:
36: return 0;
37: }
38:
39: @implementation Car
40:
41: - (void) fly
42: {
43:
44: }
45:
46: /*
47: void test2()
48: {
49: NSLog(@"调用了test2函数-%d", wheels);
50: }*/
51:
52: void test()
53: {
54: NSLog(@"调用了test函数");
55: }
56:
57: - (void)run
58: {
59: test();
60: NSLog(@"%d个轮子的车跑起来了", wheels);
61: }
62: @end
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