ios - 解除控制器委托方法不起作用

Question

我有 2viewcontroller秒，第一个 VC 包含 backButton。

第一个VC.h

@protocol DVDelegate <NSObject>
-(void)DVViewControllerDismissed:(NSString *)stringForFirst;
@end

并且还包含委托属性

@property (nonatomic, assign) id<DVDelegate> myDelegat;

第一个VC.m

firstVC 的后退按钮代码

- (IBAction)backButton_Click:(id)sender {
    NSLog(@"EEEEEE:%@",_DFCJ);
    if([_DFCJ isEqual:@"DL"]){
        NSLog(@"159");
        if([self.myDelegat respondsToSelector:@selector(DVViewControllerDismissed:)])
        {
            [self.myDelegat DVViewControllerDismissed:_DFCJ];//this method not call 
            NSLog(@"aPP");
        }
        [self dismissViewControllerAnimated:YES completion:nil];
        NSLog(@"5555");
    }
}

第二VC.m

@interface DiamondListVC ()<DVDelegate>

接收以下方法

-(void)DVViewControllerDismissed:(NSString *)stringForFirst;{
    NSLog(@"AASASS");
   [self performSelector:@selector(callService) withObject:self afterDelay:0.1];
}

结果日志

2018-04-21 09:33:39.382 search[907:16573] EEEEEE:DL
2018-04-21 09:33:39.382 search[907:16573] 159
2018-04-21 09:33:39.383 search[907:16573] 5555

但firstVC不会解雇，请查看我的代码并给我一个建议。

提前致谢。

Answer 1

之所以firstVC不能解散，是因为firstVC是从推送的secondVC，而不是呈现的。

要从 to 传递数据firstVc，secondVc您不需要使用委托。您可以secondVC使用firstVC.self.navigationController.viewControllers

第一VC.m

- (IBAction)backButton_Click:(id)sender {
  NSLog(@"EEEEEE:%@",_DFCJ);
  if([_DFCJ isEqual:@"DL"]){
    NSLog(@"159");

    // Get |SecondVC| by using |self.navigationController.viewControllers|
    NSArray* viewControllers = [[self navigationController] viewControllers]; 
    SecondVC *previousViewController = viewControllers[viewControllers.count - 2]; 
    [previousViewController DVViewControllerDismissed:_DFCJ];

    [self.navigationController popViewControllerAnimated:YES];
    NSLog(@"5555");
  }
}

第二VC.h

@interface DiamondListVC : YourClass

-(void)DVViewControllerDismissed:(NSString *)stringForFirst;

@end