获取所有页面的数组

   NSMutableArray *marr = [[NSMutableArray alloc]initWithArray:self.navigationController.viewControllers];

获取当前页面
BassViewController代表的是获取的页面

-(UIViewController *)getViewController
{
 NSMutableArray *marr = [[NSMutableArray alloc]initWithArray:self.navigationController.viewControllers];
                 UIViewController * popVC = nil;
                 for(int i=0;i<marr.count;i++){
                     if([marr[i] isKindOfClass:[BassViewController class]]){
                         popVC = marr[i+(index-1)];
                             break;
                         }
                 }
                 if (popVC)
                 {
                     return popVC
                 }
}