Swift键盘扩展程序更新NSUserDefaults

Question

I'm trying to make an iOS keyboard extension but I'm having trouble syncing/updating the data from the containing app to the extension.

As the doc states, I'm using

NSUserDefaults *mySharedDefaults = [[NSUserDefaults alloc] initWithSuiteName:@"com.example.domain.MyShareExtension"];
[mySharedDefaults setObject:theAccountName forKey:@"lastAccountName"];

That works perfectly. Before launching the keyboard in the containing app, I use that, and in the keyboard's viewdidLoad I check NSUserDefault and everything works fine.

The problem is if in my containing app I update my NSUserDefaults, how can I know in my keyboard app that the NSUserDefaults have been updated.

I tried KVO, does not work. I tried NSUserDefaultsStandard, with NSUserDidChangeNotification, does not work. NSUserDefaultsStandard does not work at all for the keyboard extension.

I was thinking of using an NSTimer in my keyboard extension, and check the NSUserDefaults every X ms. But it's overkill.

I know it's possible since apps are doing it in the AppStore. BrightKey or CoolKey change the keyboard design from the containing app. So they definitely have a callback or something to update their data.

Thanks in advance for anyone coming up with a clean solution.

Answer 1

您可以在每次键盘输入和包含应用加载时向共享用户默认值读取/写入值。

Answer 2

Mt trick is:

Just add a UITextField to your containing app, and set the Hidden property On , so the textfield is invisible.

After user selected any theme, just call textView.becomeFirstResponder() so it seems that you have loaded keyboard after user selected theme. after user selected another theme, just call textView.resignFirstResponder() and wait for about 0.6 seconds (so NSUserDefaults updates) and then again call textView.becomeFirstResponder() and your keyboard will load with new theme! :)