1 #import
2 
3 @interface TestOC : NSObject
4 
5 - (void)sayHello;
6 - (void)sayWhat:(NSString *)name andAge:(NSString *)age;
7 + (void)sayHelloTwo;
8 
9 @end

 1 #import "TestOC.h"
 2 
 3 @implementation TestOC
 4 - (void)sayHello
 5 {
 6     NSLog(@"hello to you");
 7 }
 8 
 9 - (void)sayWhat:(NSString *)name andAge:(NSString *)age
10 {
11     NSLog(@"%@,%@",name,age);
12 }
13 
14 + (void)sayHelloTwo
15 {
16     NSLog(@"i want to make friend with you");
17  
18 }
19 
20 @end

1 let he = TestOC()
2         he.sayHello()
3  
4         he.sayWhat("achao",andAge:"22")
5 TestOC.sayHelloTwo()