watchAppExtension中的NSUserDefault更改通知处理 [英] NSUserDefault change notification handling in watchAppExtension

问题描述

我正在创建一个Watch应用，目的只是为了在用户点击iPhone/主机应用中的表格视图时在手表上显示一个值.

I'm creating a  Watch app just to display a value on the watch when the user taps on a table view in the iPhone/host app.

我想收到有关共享UserDefault上的值更改的通知.它在WatchKit应用程序和iOS(主机)应用程序之间共享，因此，当用户在主机应用程序中进行任何更改时，我都希望收到通知.我已完成以下操作:

I would like to get a notification the value changes on a shared UserDefault. It is shared between WatchKit app and the iOS (host) app, so when the user makes any changes in the host app I'm expecting to get the notification. I've done the following:

当用户在应用程序(主机应用程序)中执行某些操作时:

When user do some action in application (host app):

NSUserDefaults *shared = [[NSUserDefaults alloc] initWithSuiteName:@"group.app"];
id object = [self.plantsArray objectAtIndex:[self.plantsTable indexPathForSelectedRow].row];
[shared setObject:object forKey:@"data"];
[shared synchronize];

在Watchkit扩展程序中已经注册了通知:

In the Watchkit extension have registered for the notification:

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(print) name:NSUserDefaultsDidChangeNotification object:nil];

但不幸的是，我没有收到任何通知，有人解决方案吗?

but unfortunately I'm not getting any notification, has anyone a solution?

推荐答案

我不认为iOS在应用程序和扩展之间具有distributed notifications的功能，通知在两者之间均不起作用，而是需要找到一种方式两者都可以监视更改.例如文件.

I don't think iOS has capability of distributed notifications between app and extension, notifications will not work between both, instead you need to find a way in which both can monitor changes. For example files.

您已经创建了group，您可以将文件保留在组文件夹中，并在扩展名中添加filewatcher，从app更新文件，然后filewatcher会捕获到更改，完成您的工作

As you already have created group, you can keep a file in the group folder and add a filewatcher in extension, update the file from app, and filewatcher will catch the change, and your work is done.

对于filewatcher，请参见代码此处.

希望有帮助.

干杯.

更新

找到File watcher Swift version 此处.感谢@rivera添加.

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