Can KVO be used to deeply observe variable collections?

Can KVO be used to deeply observe variable collections?

By : pelegtz
Date : November 17 2020, 11:58 AM
I wish this helpful for you You can't key-value observe through arrays. You have to observe the to-many property (spans) for changes to its content and separately observe the elements.
Once you handle addition and removal of elements so that you start and stop observing their properties, you can leverage that for the initial setup by specifying NSKeyValueObservingOptionInitial when you start observing the to-many property itself. You'll essentially be told that the initial elements have been "added".
code :

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Howto observe converted collections?

Howto observe converted collections?

By : Mani S Kartha
Date : March 29 2020, 07:55 AM
hope this fix your issue I don't know if it helps, but often in a ViewModel, I declare IList or another less specific interface as the property type instead of a specific one.
Then I can bind quasi all collections and lists to this propery.
code :
void YourDPValueChanged(DependencyPropertyChangedEventArgs e) {
    INotifyCollectionChanged newCollection = e.NewValue as INotifyCollectionChanged;
    INotifyCollectionChanged oldCollection = e.OldValue as INotifyCollectionChanged;
    if (null != newCollection) {
        newCollection.CollectionChanged += new NotifyCollectionChangedEventHandler(Collection_CollectionChanged);
    if (null != oldCollection) {
        oldCollection.CollectionChanged -= new NotifyCollectionChangedEventHandler(Collection_CollectionChanged);
What's the best way to reset deeply nested collections?

What's the best way to reset deeply nested collections?

By : u-and-i
Date : March 29 2020, 07:55 AM
This might help you Have you considered using Backbone-Relational? It'll handle most of these. I found a race condition doing this kind of stuff a few weeks ago, but it looks like Paul's fixed it.
Prototype JavaScript Event.observe - how to observe an element that may or may not be present

Prototype JavaScript Event.observe - how to observe an element that may or may not be present

By : Peter
Date : March 29 2020, 07:55 AM
wish of those help I am using Prototype JavaScript, I have a button and I want to use the Event.observe method to observe for a click action. , I hope that I understood your question :)
code :
var element = $('week_backward'),
    method = this.backward;

// Get a second element if first doesn't exist.
if (!element) {
    element = $('week_backward_second');
    method = this.backwardSecond;

element.observe('click', method.bind(this));
Is WorkManager.getInstance(applicationContext).getWorkInfoByIdLiveData(id).observe guaranteed to observe WorkInfo.State.

Is WorkManager.getInstance(applicationContext).getWorkInfoByIdLiveData(id).observe guaranteed to observe WorkInfo.State.

By : user3551686
Date : March 29 2020, 07:55 AM
hop of those help? Yes, it is guaranteed to observe though there few things that you have to keep on mind related to this API. Below is description is from google:
code :
* Adds the given observer to the observers list. This call is similar to
 * {@link LiveData#observe(LifecycleOwner, Observer)} with a LifecycleOwner, which
 * is always active. This means that the given observer will receive all events and will never
 * be automatically removed. You should manually call {@link #removeObserver(Observer)} to stop
 * observing this LiveData.
 * While LiveData has one of such observers, it will be considered
 * as active.
 * <p>
 * If the observer was already added with an owner to this LiveData, LiveData throws an
 * {@link IllegalArgumentException}.
WorkManager.getInstance(applicationContext).getWorkInfoByIdLiveData(myWorkRequest.id).observe(lifeCycleOwner, Observer {
    if (it != null && it.state == WorkInfo.State.ENQUEUED) {
How to sort deeply nested collections with ActiveRecord?

How to sort deeply nested collections with ActiveRecord?

By : Jacob Hash
Date : March 29 2020, 07:55 AM
I wish this help you I'm building a music-managing Rails app, and my app's users will be able to make ordered playlists of albums, and each album will have an ordered list of songs. , have you tried:
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