二、代码

#import <Foundation/Foundation.h>

typedef enum
{
    kIColorBlack,       // 黑色
    kIColorWhite,       // 白色
    kIColorTuHaoJin,    // 土豪金
}IColor;

#pragma mark 类
@interface IPhone : NSObject
{
@public
    float _model;    // 型号
    int _cpu;        // cpu
    double _size;    // 尺寸
    IColor _color;      // 颜色  0代表黑色 1代表白色 2土豪金
}

-(void)about;
-(char *)loadMessage;
-(int) signal:(int)number;
- (int)sendMessageWithNumber:(int)number andContent:(char *)content;
+(int)sumWithValue1:(int)v1 andValue2:(int)v2;
+(void)demo;
//-(NSString *)colorWithNumber:(IColor)number;
+(NSString *)colorWithNumber:(IColor)number;
@end


#pragma mark 实现

@implementation IPhone
-(void)about
{
//    char *name;
    /*
    NSString *name;
    switch (_color) {
        case 0:
            name = @"黑色";
            break;
        case 1:
            name = @"白色";
            break;
        case 2:
            name = @"土豪金色";
            break;
            
        default:
            name = @"五颜六色";
            break;
    }
    */
//    IPhone *p = [IPhone new];
//    NSString *name =  [p colorWithNumber:_color];
    NSString *name = [IPhone colorWithNumber:_color];
//    NSLog(@"型号 = %f cpu = %i,尺寸 = %f, 颜色 =%i",_model,_cpu,_size,_color);
    NSLog(@"型号 = %f cpu = %i,尺寸 = %f, 颜色 =%@",_model,_cpu,_size,name);

}

// 工具方法, 根据传入的整数 返回对应的字符串
//-(NSString *)colorWithNumber:(IColor)number
+(NSString *)colorWithNumber:(IColor)number
{
    NSString *name;
    switch (number) {
        case 0:
            name = @"黑色";
            break;
        case 1:
            name = @"白色";
            break;
        case 2:
            name = @"土豪金色";
            break;
            
        default:
            name = @"五颜六色";
            break;
    }
    return name;
}
-(char *)loadMessage
{
    char *content = "老婆我们家我做主";
    return "lyh is cool";
}
-(int) signal:(int)number
{
    NSLog(@"打电话 %i",number);
    return 1;
}
- (int)sendMessageWithNumber:(int)number andContent:(char *)content
{
    NSLog(@"发短息 %i, 内容: %s",number,content);
    return 1;
}
+(int)sumWithValue1:(int)v1 andValue2:(int)v2;
{
    IPhone *p = [IPhone new];
    [p signal:123];
    return v1 + v2;
}

+(void)demo
{
    [IPhone sumWithValue1:30 andValue2:40];
}
@end


#pragma mark main函数
void text();
int main(int argc, const char * argv[])
{
    // 1.创建对象
    // 每次给iPhone类 发送一个new消息 都会开辟一块新的存储空间
    // 也就 意味着每次发送new 消息 创建出来的对象 都是一个新的对象
     IPhone *p = [IPhone new];
    p->_color = kIColorWhite;
    p->_cpu = 1;
    p->_size = 3.5;
    p->_model = 4;
    [p about];
    return 0;
}

void text()
{
    IPhone *p1 = [IPhone new];
    int res = [IPhone sumWithValue1:10 andValue2:20];
    NSLog(@"res = %i",res);
    
}