How to detect the Simulator and Device code in Xcode?

I am using AVCaptureSession class to capture video. This class only active for Device mode. Other functionality working both simulator and device. How to handle this class for Simulator mode. Whether i have开发者_如何转开发 to command this class? please advice.

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You can do this using three methods :

• At compilation, by using preprocessor directive :

  #if TARGET_IPHONE_SIMULATOR
  // simulator code
  #else
  // device code
  #endif
  

• At runtime (more complex), by checking device :

  // Simple version :
  if ([[[UIDevice currentDevice] model] isEqualToString:@"iPhone Simulator"]) {
     // code
  }
  

  OR

  // More precise version:
  - (NSString *) platform{
    size_t size;
    sysctlbyname("hw.machine", NULL, &size, NULL, 0);
    char *machine = malloc(size);
    sysctlbyname("hw.machine", machine, &size, NULL, 0);
    NSString *platform = [NSString stringWithCString:machine encoding:NSUTF8StringEncoding];
    free(machine);
    return platform;
  }
  
  - (NSString *) platformString{
    NSString *platform = [self platform];
    if ([platform isEqualToString:@"iPhone1,1"])    return @"iPhone1G";
    if ([platform isEqualToString:@"iPhone1,2"])    return @"iPhone3G";
    if ([platform isEqualToString:@"iPhone2,1"])    return @"iPhone3GS";
    if ([platform isEqualToString:@"iPhone3,1"])    return @"iPhone4";
    if ([platform isEqualToString:@"iPod1,1"])      return @"iPodTouch1G";
    if ([platform isEqualToString:@"iPod2,1"])      return @"iPodTouch2G";
    if ([platform isEqualToString:@"iPod3,1"])      return @"iPodTouch3G";
    if ([platform isEqualToString:@"iPod4,1"])      return @"iPodTouch4G";
    if ([platform isEqualToString:@"iPad1,1"])      return @"iPad";
    if ([platform isEqualToString:@"iPad2,1"])      return @"iPad2Wifi";
    if ([platform isEqualToString:@"iPad2,2"])      return @"iPad2GSM";
    if ([platform isEqualToString:@"iPad2,3"])      return @"iPad2CDMA";
    if ([platform isEqualToString:@"i386"])         return @"iPhoneSimulator";
    return platform;
  }
  

• At project build settings by excluding files depending on SDK (even more complex, but useful for librairies) :

  "EXCLUDED_SOURCE_FILE_NAMES[sdk=iphoneos*][arch=*]" = ...
  

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There is a better way now! As of Xcode 9.3 beta 4 you can use #if targetEnvironment(simulator) to check.