如何在程序中判读程序是运行在真机上还是在模拟器上

最新推荐文章于 2021-11-05 00:49:34 发布

转载最新推荐文章于 2021-11-05 00:49:34 发布 · 731 阅读

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本文介绍了如何在iOS应用开发中使用预处理器宏来决定代码是在模拟器还是设备上编译，通过`TARGET_IPHONE_SIMULATOR`和`TARGET_OS_IPHONE`宏实现代码的条件编译。

Compiling Source Code Conditionally for iOS Applications
There may be times when you need to run code on the simulator but not on a device, and the other way around. On those occasions, you can use the preprocessor macros TARGET_OS_IPHONE and TARGET_IPHONE_SIMULATOR to conditionally compile code.
Listing 2-1 shows how to use the TARGET_IPHONE_SIMULATOR macro to determine whether code meant for iOS is being compiled for the simulator or devices.
Listing 2-1  Determining whether you’re compiling for the simulator
// Set hello to "Hello, <device or simulator>"!
#if TARGET_IPHONE_SIMULATOR
   NSString *hello = @"Hello, iOS Simulator!";
#else
   NSString *hello = @"Hello, iOS device!";
#endif
Listing 2-2 shows how to use the TARGET_OS_IPHONE macro in a source file to be shared between Mac OS X and iOS.
Listing 2-2  Determining whether you’re compiling for iOS
#if TARGET_OS_IPHONE
   #import <UIKit/UIKit.h>
#else
   #import <Cocoa/Cocoa.h>
#endif
The TARGET_OS_IPHONE and TARGET_IPHONE_SIMULATOR macros are defined in the TargetConditionals.h header file.

例子：

#ifdef __APPLE__
   #include "TargetConditionals.h"
#endif

#if TARGET_IPHONE_SIMULATOR
NSString *hello = @”Hello, iPhone simulator!”;
#elif TARGET_OS_IPHONE
NSString *hello = @”Hello, device!”;
#else
NSString *hello = @”Hello, unknown target!”;
#endif