NavigationController中popToViewController时，回传参数问题

------------SelecViewController.h------------

@interface SelecViewController : UIViewController

@property (nonatomic) BOOL isOK; //需要被回传的参数

@end

------------SelecViewController.m------------

#import "SelecViewController.h"

#import "LongEditViewController.h"

// 实现push

LongEditViewController *longController = [[LongEditViewController alloc] init];

[self.navigationController pushViewController:longController animated:YES];

=======

------------LongEditViewController.m------------

#import "LongEditViewController.h"

#import "SelecViewController.h"

//实现pop 并回传isOk参数

SelecViewController *selecController = [self.navigationController.viewControllers objectAtIndex:self.navigationController.viewControllers.count - 2];

selecController.isOK = YES;

[self.navigationController popToViewController:selecController animated:YES];