DiffableDataSources | đź’ľ A library
kandi X-RAY | DiffableDataSources Summary
kandi X-RAY | DiffableDataSources Summary
Apple has announced a diffable data source at WWDC 2019. It's a great API that easily updating our table view and collection view items using automatic diffing. However, it's a little while before we can use it in a production service. That because it requires the latest OS to use. DiffableDataSources make it possible to introduce almost the same functionality from now on. Uses a sophisticated open source DifferenceKit for the algorithm engine. It's extremely fast and completely avoids synchronization bugs, exceptions, and crashes.
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QUESTION
I'm using the tableView using DiffableDataSource and only issue which I've faced in header.I'm using viewForheaderSections method for calling header header view appear but on bottom position not top of the list please see the code thanks.
...ANSWER
Answered 2022-Feb-15 at 08:08According to your code you are not using viewForHeaderInSection. Instead of that you are using viewForFooterInSection. So instead of a header, a footer will appear in the bottom.
If you only need a header change all the methods related to the footer to the header.
QUESTION
I am currently learning DiffableDataSource. I am using NSDiffableDataSourceSectionSnapshot(), not NSDiffableDataSourceSnapshot() to create sections for my dataSource
Depending on which section is being clicked, i want to increase section model data counter property. However, I face issue when reloading the section using the sectionSnapshot(). The total counter property later on will be displayed as sectionHeader.
Below are my structs
...ANSWER
Answered 2021-Aug-23 at 21:52Your section is a struct—a value type—so when you change the section count, you change the hash that the diffable data source is using as the identifier. It doesn’t know that you are updating a preexisting section; it thinks it is a brand new section.
In general, section identifiers should be identifiers and not contain mutable state. You can write your hash and equality methods to ignore that mutable state, but thinking about it is a pain, so just keep the actual data elsewhere and look it up based on the section identifier.
QUESTION
I've got a Git repo of Markdown articles, where people create pull requests (one per Markdown article) that eventually get merged to master and then, working directly on master, I move that article into a folder called wordpressed and commit and push to master.
And I've got a very old pull request that is still sitting there in a branch called home-base, consisting of a file dan/homebase.md which I'm thinking of editing into shape with some more commits and then merging to master.
This home-base branch is so old that the repo, seen from its point of view, is totally different from how it looks today in master. So I thought it might be good to reverse merge master into home-base just to bring it more up to date and move the merge base up a lot.
But when I try to do that, I get a merge conflict that I can't understand.
To show you the situation, I'm going to show what a ls of files and folders looks like in each branch. I'll start with master:
ANSWER
Answered 2021-Apr-15 at 23:36This particular conflict:
QUESTION
I am using a UICollectionView with UICollectionViewDiffableDataSource and fetching data both asynchronously and synchronously to populate the view. The app crashes with this message: "Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid parameter not satisfying: itemCount'."
I believe it has something to do with the combination of sync and async data fetching, as when I implement one or the other the app runs as expected.
A simple version of the code follows:
...ANSWER
Answered 2020-Sep-08 at 15:27Fix for this crash:
When setting up the collection view layout group, explicitly provide the item count:
QUESTION
I have a hard time to understand how DiffableDataSource works. I have ViewModel like this
...ANSWER
Answered 2020-Jun-08 at 19:14It's because you implemented Hashable incorrectly.
Remember, Hashable also means Equatable — and there is an inviolable relationship between the two. The rule is that two equal objects must have equal hash values. But in your ViewModel, "equal" involves comparing all three properties, id, title, and subtitle — even though hashValue does not, because you implemented hash.
In other words, if you implement hash, you must implement == to match it exactly:
QUESTION
I'm trying to implement table view with new DiffableDataSource api, but the cells simply do not load:
...ANSWER
Answered 2020-Feb-22 at 10:27First of all there is a big design mistake in your code.
With UITableViewDiffableDataSource stop thinking in index paths and data source arrays. Instead think in datasource items.
In setupDataSource you get the model item of the row always from the data source array currencyPairsArray regardless whether you are going to display the filtered data or not. Forget currencyPairsArray and the index path. Take advantage of the third parameter in the closure which represents the item.
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