如何在Xcode中检测模拟器和设备代码？

Question

我正在使用AVCaptureSession类来捕获视频.此类仅对设备模式有效.其他功能同时适用于模拟器和设备.如何为Simulator模式处理此类.我是否必须指挥这门课程？请指教.

Answer 1

您可以使用三种方法执行此操作:

• 在编译时,通过使用预处理器指令:

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

• 在运行时(更复杂),通过检查设备:

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

  要么

  // 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;
  }
  

• 在项目构建设置中,通过根据SDK排除文件(甚至更复杂,但对于库(librairies)有用):

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