如何从 AppDelegate.m 重新加载 TableView 数据? [英] How to reload TableView data from AppDelegate.m?

问题描述

我尝试从 AppDelegate.m 重新加载 TableView 数据，但没有成功.

I've tryed to reload TableView data from AppDelegate.m but with no success.

这是代码(在 HomeViewController 中工作):

Here is code (whis is working in HomeViewController):

AppDelegate.m

...
- (void)applicationWillEnterForeground:(UIApplication *)application
{
[self refreshTableData];
}

-(void)refreshTableData{

    UINavigationController *navController = [[self.tabBarController viewControllers] objectAtIndex:0];
    HomeViewController *home = [[navController viewControllers] objectAtIndex:0];

    NSEntityDescription *entity = [NSEntityDescription entityForName:@"MYTable" inManagedObjectContext:home.context];

    NSFetchRequest *request = [[NSFetchRequest alloc] init];

    [request setFetchBatchSize:20];

    [request setEntity:entity];

    NSSortDescriptor *sort = [[NSSortDescriptor alloc] initWithKey:@"orderEnt" ascending:YES];

    NSArray *newArray = [NSArray arrayWithObject:sort];

    [request setSortDescriptors:newArray];

    NSError *error;

    NSMutableArray *results = [[home.context executeFetchRequest:request error:&error] mutableCopy];

    [home setArr:results];

    //NSLog(@"%@", home.arr);//here is showed correct data

    home.context = self.managedObjectContext;

    [home.myTableView reloadData];


}
...

有人知道如何从 AppDelegate.m 重新加载数据吗?

Does anybody know how to reload data from AppDelegate.m?

推荐答案

你可以实施

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

在你的 viewDidLoad() 方法和

- (void)reloadTableViewData{
  [self.myTableView reloadData];
}

在要重新加载数据的类中.

in the class where you want to reload the Data.

然后你发送这样的通知

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

每当您想重新加载数据时.

whenever you want to reload the data.

多年 iOS 开发经验后的注意事项:虽然这是一个非常简单和舒适的解决方案，但它并不是 100% 可靠的.在某些情况下，通知可能会延迟几秒钟.我强烈建议为您的 UITableViewController 创建一个快速可靠的委托连接.

Note after some years of iOS development experience: While this is a very easy and comfortable solution, it is not 100% reliable. Notifications can be delayed by several seconds under certain circumstances. I would highly recommend to create a fast and reliable delegate connection to your UITableViewController.

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