如何使特定观察者听到的NSNotification？

Question

我想开发一个云存储应用程序，我想实现该用户可以将文件或文件夹移动到另一个文件夹。

-(void)setUpNote{ 

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(MoveCopypopViewClicked:) name:@"MoveCopypopViewClickedNotification" object:nil]; 
} 

我设置了一个标记thisIsOnTop来标记顶部的视图。

-(void)viewWillAppear:(BOOL)animated{ 
self.thisIsOnTop = YES; 

[super viewWillAppear:YES]; 

self.myPopView = [[MoveCopyPopView alloc]initWithFrame:CGRectMake(0, screenH, screenW, bottomH)]; 

[HBKeyWindow addSubview:self.myPopView]; 

[UIView animateWithDuration:0.5 animations:^{ 
    self.myPopView.frame = CGRectMake(0, screenH - bottomH, screenW, bottomH); 
}]; 
[self setupRefresh]; 
} 

-(void)viewWillDisappear:(BOOL)animated{ 
self.thisIsOnTop = NO; 
if (self.tableViewStatus == 1) { 
    //[self.tableView setEditing:!self.tableView.editing animated:YES]; 
    self.tableViewStatus = 0; 
    [self disapperPopView]; 
} 
} 

-(void)MoveCopypopViewClicked:(NSNotification *)text{ 
NSDictionary * dict = text.userInfo; 
NSString * btnClicked = [dict objectForKey:@"btnClicked"]; 
self.mycurrentPOPBtnClicked = btnClicked; 

if ([self.myChooseType isEqualToString:@"file"]) { 
    if ([btnClicked isEqualToString:@"CreateFolderBtnClicked"]) { 

     [self showNewFolderView]; 

    }else if ([btnClicked isEqualToString:@"ConfirmBtnClicked"]){ 
     [[NSNotificationCenter defaultCenter] postNotificationName:@"MoveCopypopViewClickedNotification" object:nil userInfo:self.prepareToPushFolderID]; 

     for (UIViewController *temp in self.navigationController.viewControllers) { 
      if ([temp isKindOfClass:[MyDesignTableViewController class]]) { 
       [self.navigationController popToViewController:temp animated:YES]; 
      } 
     } 

     [self disapperPopView]; 
     [self.tableView reloadData]; 
     [self.tableView.mj_header beginRefreshing]; 
    } 
}else if ([self.myChooseType isEqualToString:@"folder"]){ 
    if ([btnClicked isEqualToString:@"CreateFolderBtnClicked"]) { 
     [self showNewFolderView]; 

    }else if ([btnClicked isEqualToString:@"ConfirmBtnClicked"]){ 

     [self loadMoveFolderRequest]; 

     [self.navigationController popToViewController:[self.navigationController.viewControllers objectAtIndex:2] animated:YES]; 

     [self disapperPopView]; 
     [self.tableView reloadData]; 
     [self.tableView.mj_header beginRefreshing]; 
    } 
} 
} 

当我移动文件并选择目标文件夹并单击确认移动按钮时，文件未移动到我选择的文件夹。

Answer 1

您需要实际发布通知才能激活“观察者”。

编辑：

需要注意的是，如果你想收到folderID在loadMoveRequest方法，那么它应该是“选择”中的addObserver像这样：

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(loadMoveRequest:) name:@"MoveCopypopViewClickedNotification" object:nil]; 

将您发布的通知，并通在folderID：

[[NSNotificationCenter defaultCenter] postNotificationName:@"MoveCopypopViewClickedNotification" object:nil userInfo:[NSDictionary dictionaryWithObject:[NSNumber numberWithInteger:folderID] forKey:@"folderID"]]; 

如果你需要通过一些具体的通知数据，你可以通过设置NSDictionary到这样做而不是通过nil。

最后实现loadMoveRequest：方法如下所示：

- (void)loadMoveRequest:(NSNotification *notification) { 

    NSInteger folderId = [[[notification userInfo] objectForKey:@"folderID"] integerValue]; 

} 

Answer 2

您需要处理的观察者在类/视图 - 控制在您已写入到移动文件的功能如下：

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(MoveCopypopViewClicked:) name:@"MoveCopypopViewClickedNotification" object:nil]; 

然后，你必须写函数名称MoveCopypopViewClicked这将有代码移动在该类/ viewcontroler的文件。

然后你需要触发通知如下;

[[NSNotificationCenter defaultCenter] postNotificationName:@"MoveCopypopViewClickedNotification" object:nil userInfo:nil]; 

，并与此通知传递值，您可以通过的NSDictionary到USERINFO