iOS 判断iPhone机型的方法

+ (BOOL)isNotIphone3G {
	static BOOL done = FALSE;
	static BOOL result;
	if (!done) {
		size_t size;
		sysctlbyname("hw.machine", NULL, &size, NULL, 0);
		char *machine = malloc(size);
		sysctlbyname("hw.machine", machine, &size, NULL, 0);
		NSString *platform = [[NSString alloc] initWithUTF8String:machine];
		free(machine);

		result = ![platform isEqualToString:@"iPhone1,2"];

		done = TRUE;
	}
	return result;
}