編譯期間確定目標名稱

Question

我有幾個目標，根據他們我需要導入標題。我可以定義一些預處理值，然後使用#ifdef來檢查它做到這一點，但我想知道，如果有什麼辦法可以這樣做：

#if TARGET_NAME = "FirstTarget" 
#import "SomeHeader.h" 
#endif 

Answer 1

ü可以使用如下例如，

//Your current target's are defined 
#define FIRST_TARGET "FirstTarget" 
#define SECOND_TARGET "SecondTarget" 
#define THIRD_TARGET "ThirdTarget" 

//set which target u want to run 
#define TARGET_NAME FIRST_TARGET //SECOND_TARGET //THIRD_TARGET 

//use like below 

#if (TARGET_NAME == FIRST_TARGET) //or u can directly specify name instead of defining at the beginning 
    #import "SomeHeader.h" 
    //other headers 
#elif (TARGET_NAME == SECOND_TARGET) 
    //header to be in second target 
#elif (TARGET_NAME == THIRD_TARGET) 
    // other header 
#endif 

編輯：

我得到它，它給了錯誤，因爲宏並不比可變長度值，詳細內容見本hear。

所以爲了工作ü可以改變它像下面，

//Your current target's are defined, instead of strings give some constant values 
#define FIRST_TARGET 1//@"FirstTarget" 
#define SECOND_TARGET 2//@"SecondTarget" 
#define THIRD_TARGET 3//@"ThirdTarget" 

//set which target u want to run 
#define TARGET_NAME FIRST_TARGET //SECOND_TARGET //THIRD_TARGET 

//use like below 
#if TARGET_NAME == FIRST_TARGET 
#import "SomeHeader.h" 
//other headers 
#elif (TARGET_NAME == SECOND_TARGET) 
//header to be in second target 
#elif (TARGET_NAME == THIRD_TARGET) 
// other header 

#endif