iPhone identifier对应设备类型（含iPhone 11系列）

/**
 *  取设备型号标识符，e.g. iPhone8,1
 *
 *  @return 设备型号标识符
 */
- (NSString *_Nonnull)identifier {
    struct utsname systemInfo;
    uname(&systemInfo);
    NSString *platform = [NSString stringWithCString:systemInfo.machine encoding:NSUTF8StringEncoding];
    if ([platform isEqualToString:@"x86_64"])     return @"Simulator";
    if ([platform isEqualToString:@"i386"])       return @"Simulator";
    if ([platform isEqualToString:@"iPhone1,1"])  return @"iPhone";
    if ([platform isEqualToString:@"iPhone1,2"])  return @"iPhone 3G";
    if ([platform isEqualToString:@"iPhone2,1"])  return @"iPhone 3GS";
    if ([platform isEqualToString:@"iPhone3,1"])  return @"iPhone 4";
    if ([platform isEqualToString:@"iPhone3,2"])  return @"iPhone 4";
    if ([platform isEqualToString:@"iPhone3,3"])  return @"iPhone 4";
    if ([platform isEqualToString:@"iPhone4,1"])  return @"iPhone 4S";
    if ([platform isEqualToString:@"iPhone5,1"])  return @"iPhone 5";
    if ([platform isEqualToString:@"iPhone5,2"])  return @"iPhone 5c";
    if ([platform isEqualToString:@"iPhone5,3"])  return @"iPhone 5c";
    if ([platform isEqualToString:@"iPhone5,4"])  return @"iPhone 5c";
    if ([platform isEqualToString:@"iPhone6,1"])  return @"iPhone 5s";
    if ([platform isEqualToString:@"iPhone6,2"])  return @"iPhone 5s";
    if ([platform isEqualToString:@"iPhone7,1"])  return @"iPhone 6 Plus";
    if ([platform isEqualToString:@"iPhone7,2"])  return @"iPhone 6";
    if ([platform isEqualToString:@"iPhone8,1"])  return @"iPhone 6s";
    if ([platform isEqualToString:@"iPhone8,2"])  return @"iPhone 6s Plus";
    if ([platform isEqualToString:@"iPhone8,4"])  return @"iPhone SE";
    if ([platform isEqualToString:@"iPhone9,1"])  return @"iPhone 7";
    if ([platform isEqualToString:@"iPhone9,3"])  return @"iPhone 7";
    if ([platform isEqualToString:@"iPhone9,2"])  return @"iPhone 7 Plus";
    if ([platform isEqualToString:@"iPhone9,4"])  return @"iPhone 7 Plus";
    if ([platform isEqualToString:@"iPhone10,1"]) return @"iPhone 8";
    if ([platform isEqualToString:@"iPhone10,4"]) return @"iPhone 8";
    if ([platform isEqualToString:@"iPhone10,2"]) return @"iPhone 8 Plus";
    if ([platform isEqualToString:@"iPhone10,5"]) return @"iPhone 8 Plus";
    if ([platform isEqualToString:@"iPhone10,3"]) return @"iPhone X";
    if ([platform isEqualToString:@"iPhone10,6"]) return @"iPhone X";
    if ([platform isEqualToString:@"iPhone11,2"]) return @"iPhone XS";
    if ([platform isEqualToString:@"iPhone11,4"]) return @"iPhone XS Max";
    if ([platform isEqualToString:@"iPhone11,6"]) return @"iPhone XS Max";
    if ([platform isEqualToString:@"iPhone11,8"]) return @"iPhone XR";
    if ([platform isEqualToString:@"iPhone12,1"]) return @"iPhone 11";
    if ([platform isEqualToString:@"iPhone12,3"]) return @"iPhone 11 Pro";
    if ([platform isEqualToString:@"iPhone12,5"]) return @"iPhone 11 Pro Max";

    return platform;
}