在模拟器上起作用但在设备上不起作用的一个原因是，Max OS X默认使用不区分大小写的文件系统，而iOS使用大小写敏感的文件系统.检查并确保文件名的大小写为"Localizable.strings".

One reason that something works on the simulator, but not on the device is that Max OS X uses case-insensitive file systems by default, but iOS uses a case-sensitive file system. Check to make sure that your case for the filename is "Localizable.strings".