popViewControllerAnimated 无效的问题解决

//类C
#import "OpenBankSystemVC.h"
- (void)viewDidLoad {
//注册通知
NSNotificationCenter *aNC = [NSNotificationCenter defaultCenter];

[aNC addObserver:self
selector:@selector(openBankBack)
name:BS_OPEN_BANK_BACK
object:nil];

｝
//接收通知后
- (void)openBankBack
{
//pop掉当前界面C，然后发通知给界面B
[self.navigationController popViewControllerAnimated:NO];//问题的重点就在这个NO上，一定是NO，为YES的话，界面B的pop方法则无效

[[NSNotificationCenter defaultCenter] postNotificationName:@"openBankSysSuccessFromPop" object:nil];

}

//类B
#import "BankHomeVC.h"

- (void)viewDidLoad {
//注册通知
NSNotificationCenter *aNC = [NSNotificationCenter defaultCenter];

[aNC addObserver:self
selector:@selector(openBankBack)
name:@"openBankSysSuccessFromPop"
object:nil];

｝

//接收通知
- (void)openBankBack {
[self.navigationController popViewControllerAnimated:NO];//pop掉自己，返回类A
}