iPhone-从更高的ViewController刷新TableView VC [英] iPhone - Refreshing TableView VC from higher ViewController

问题描述

我有一个带有TableView的ViewController(A)，其中每一行都是一个目录名.每行都推送一个新的ViewController(B).在ViewController B内部，我正在运行删除当前打开的目录的方法.但是，当我弹出视图并返回TableView时，我显然仍然在目录中.我该如何解决?

I have ViewController (A) with TableView where each row is a directory name. Each row is pushing a new ViewController (B). Inside ViewController B I am running method to delete the currently opened directory. However, when I pop the view and go back to TableView I obviously still have this directory on list. How can I fix it?

如何在导航返回时刷新TableView?

不，-viewWillAppear中简单的[self.tableView reloadData]并不能真正起作用.

And no, simple [self.tableView reloadData] inside -viewWillAppear doesn't really work.

代码:

我的-viewWillAppear:

My -viewWillAppear:

- (void)viewWillAppear:(BOOL)animated {
    NSString *docDir = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
    self.arrFolders = [[NSMutableArray alloc] init];
    [self allFilesInDocuments:docDir];
}

-allFilesInDocuments只是将项目添加到数组([arrFolders addObject:folder];).

-allFilesInDocuments is just adding items to array ([arrFolders addObject:folder];).

在-tableView:cellForRowAtIndexPath:内部，我用

cell.textLabel.text = [arrFolders objectAtIndex:indexPath.row];

推荐答案

使用NSNotification.

Use a NSNotification.

在ViewController(A)的viewDidLoad中注册通知:

In the viewDidLoad of ViewController (A) register for a notification:

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

还添加选择器功能:

-(void) deleteRow:(NSNotification *)notif{
[self.tableView reloadData];

}

最后在子视图控制器中，在删除"功能中发布通知:

Finally in the child view controllers, in your Delete function post the notification:

[[NSNotificationCenter defautCenter] postNotificationName:@"deletedRow" object:nil userInfo:nil];

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