Objective-C
类、对象、方法
1.编写一个复数类:
#import <Foundation/Foundation.h>
@interface Complex: NSObject //类声明,Complex继承NSObject
{
int iReal;//成员变量声明,在括号内
int iImag;
} //成员函数声明,在括号外
-(void) print;
-(void) setReal : (int) n;
-(void)setImag : (int) d; @end //@interface ....@end区域完成类声明 @implementation Complex //成员函数实现部分 -(void) print //开头的负号(-)告诉编译器是实例方法,
{
NSLog(@"iReal = %i, iImag = %i \n", iReal, iImag);//"\n"和C/C++,表示换行
} -(void)setReal : (int) n // 返回值为void,输入参数为int n
{
iReal = n;
} -(void)setImag: (int) d
{
iImag = d;
} @end //@implementation ... @end区域完成类成员函数实现
2.使用Complex类
int main(int argc, const char* argv[])
{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; //使用方法语法: [ClassOrInstance method]
myComplex = [Complex alloc];
myComplex = [Complex init];
//可以合成一句 myComplex = [ [Complex alloc] init]
//或者myComplex = [ Complex new] [myComplex setReal : ];//调用带参数的方法,实部设置为1
[myComplex setImag : ]; [myComplex print];//调用print方法 [myComplex release];//释放alloc的myComplex
[pool drain];
return ; }
3.自己编程规范
(1).类首个字母大写
(2).函数和变量、对象首个字母小写
(3).变量加上类型修饰,可以区分对象