－Ben's PHOTO－

最近手邊進行一項工程，要將 Object-C 的程式碼「移植」到 C# 的機器上。Object-C 是拿手的，但 C# 完全不熟啊～於是上網找了一些資料，練習嘗試設計一個小範例，用Object-C 與 C# 各寫了一份，體會其中的奧妙。

範例是設計一個類別 iPhone4S，用實例與單例宣告為物件並賦予預設值。

Object-C

iPhone4S.h
#import <Foundation/Foundation.h>

@interface iPhone4S : NSObject

@property (nonatomic,retain) NSString *simCode;

+ (instancetype)shareInstance;

- (NSString *)doCallOut:(NSString *)phoneNumber;

- (NSString *)handUp;

- (NSString *)volumeChanged:(NSInteger)volumeVal;

- (NSString *)doVibrate;

- (NSString *)doSiri:(NSString *)speakCommand;

@end

iPhone4S.m
#import "iPhone4S.h"

@implementation iPhone4S

static iPhone4S *theiPhone4s = nil;

- (instancetype)init{
    self = [super init];
    if (self) {
        self.simCode = @"0000";
    }
    return self;
}

+ (instancetype)shareInstance{
    @synchronized (theiPhone4s) {
        if (theiPhone4s == nil) {
            theiPhone4s = [[iPhone4S alloc] init];
        }
        else{
            NSLog(@"NOT NEW 新建iphone4S");
        }
    }
    return theiPhone4s;
}


- (NSString *)doCallOut:(NSString *)phoneNumber{
    NSLog(@"iOS打電話給%@",phoneNumber);
    return @"撥號中";
    
}

- (NSString *)handUp{
    NSLog(@"iOS將通話中電話結束");
    return @"結束通話";
}

- (NSString *)volumeChanged:(NSInteger)volumeVal{
    NSLog(@"iOS將音量調整為%li",(long)volumeVal);
    return @"完成調音量";
}

- (NSString *)doVibrate{
    NSLog(@"iOS將轉振動");
    return @"完成轉振動";
}

- (NSString *)doSiri:(NSString *)speakCommand{
    return [@"Siri說:" stringByAppendingString:speakCommand] ;
}

@end

C#

iPhone4S.cs

using System;

public class iPhone4S
{
    #region 宣告變數名稱
    public string simCode { set; get; } //姓名

    #endregion

    private static readonly object locker = new object();
    private static iPhone4S theiPhone4s = null;

    /* 使用 private 則禁止從外部產生實例，用於Singleton
    private iphone4S()
    {
        simcode = "0000";
        Console.WriteLine("iphone4S 電話:" + phonenumber);
    }
    */
    public iPhone4S()
    {
       simCode = "0000";
    }

    public static iPhone4S shareInstance()
    {
        lock (locker)
        {
            if (theiPhone4s == null)
            {
                theiPhone4s = new iPhone4S();
            }
            else
            {
                Console.WriteLine("NOT NEW 新建iphone4S");
            }
        }
        
        return theiPhone4s;
    }

    public string doCallOut(string phoneNumber)
    {
        Console.WriteLine("iOS打電話給" + phoneNumber);
        return "撥號中";
    }

    public string handUp()
    {
        Console.WriteLine("iOS將通話中電話結束");
        return "結束通話";
    }

    public string volumeChanged(int volumeVal)
    {
        Console.WriteLine("iOS將音量調整為" + volumeVal);
        return "完成調音量";
    }

    public string doVibrate()
    {
        Console.WriteLine("iOS將轉振動");
        return "完成轉振動";
    }

    public string doSiri(string speakCommand)
    {
        return "Siri說:" + speakCommand;
    }
}

驗證：設計一個按鈕，print 結果

Object-C

-(IBAction)btnLogSimCode_Click:(id)sender{
    iPhone4S *myPhone = [[iPhone4S alloc] init];
    iPhone4S *companyPhone = [iPhone4S shareInstance];
    iPhone4S *companyPhone2 = [iPhone4S shareInstance];
    
    myPhone.simCode = @"1234";
    companyPhone2.simCode = @"5678";
    
    NSLog(@"myPhone 電話 Sim Code:%@" , myPhone.simCode);
    NSLog(@"companyPhone 電話 Sim Code:%@" , companyPhone.simCode);
    NSLog(@"companyPhone2 電話 Sim Code:%@" , companyPhone2.simCode);
}

結果輸出：
[1742:111130] NOT NEW 新建iphone4S
[1742:111130] myPhone 電話 Sim Code:1234
[1742:111130] companyPhone 電話 Sim Code:5678
[1742:111130] companyPhone2 電話 Sim Code:5678

C#

private void btnLogSimCode_Click(object sender, EventArgs e)
{
    iPhone4S myPhone = new iPhone4S();
    iPhone4S companyPhone = iPhone4S.shareInstance();
    iPhone4S companyPhone2 = iPhone4S.shareInstance();

    myPhone.simCode = "1234";
    companyPhone2.simCode = "5678";

    Console.WriteLine("myPhone 電話 Sim Code:" + myPhone.simCode);
    Console.WriteLine("companyPhone 電話 Sim Code:" + companyPhone.simCode);
    Console.WriteLine("companyPhone2 電話 Sim Code:" + companyPhone2.simCode);
}

結果輸出:
NOT NEW 新建iphone4S
myPhone 電話 Sim Code:1234
companyPhone 電話 Sim Code:5678
companyPhone2 電話 Sim Code:5678

其實數十種程式語言發展到現在，只要現在還在主流的，不管是哪一種，概念上都有共通和相同的部分。只是語法上的差異還真令人腦袋糾結，