获取iOS当前版本号

//此获取的版本号对应bundle，打印出来对应为12345这样的数字
NSNumber *number = [[[NSBundle mainBundle] infoDictionary] objectForKey:(NSString*)kCFBundleVersionKey];

//此获取的版本号对应version，打印出来对应为1.2.3.4.5这样的字符串
NSString *string = [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleShortVersionString"];