mirror of
https://github.com/Instagram/IGListKit
synced 2026-05-06 06:58:26 +00:00
81955e4106
Summary: Issue fixed: #770 - [ ] All tests pass. Demo project builds and runs. - [ ] I added tests, an experiment, or detailed why my change isn't tested. - [x] I added an entry to the `CHANGELOG.md` for any breaking changes, enhancements, or bug fixes. - [x] I have reviewed the [contributing guide](https://github.com/Instagram/IGListKit/blob/master/.github/CONTRIBUTING.md) Closes https://github.com/Instagram/IGListKit/pull/783 Differential Revision: D5137558 Pulled By: rnystrom fbshipit-source-id: e8c94d5d6d0ffde4f283915a21cd015604938c88
66 lines
2.3 KiB
Objective-C
66 lines
2.3 KiB
Objective-C
/**
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* Copyright (c) 2016-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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#import <UIKit/UIKit.h>
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#import <IGListKit/IGListDiffable.h>
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@class IGListAdapter;
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@class IGListSectionController;
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NS_ASSUME_NONNULL_BEGIN
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/**
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Implement this protocol to provide data to an `IGListAdapter`.
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*/
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NS_SWIFT_NAME(ListAdapterDataSource)
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@protocol IGListAdapterDataSource <NSObject>
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/**
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Asks the data source for the objects to display in the list.
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@param listAdapter The list adapter requesting this information.
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@return An array of objects for the list.
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*/
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- (NSArray<id <IGListDiffable>> *)objectsForListAdapter:(IGListAdapter *)listAdapter;
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/**
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Asks the data source for a section controller for the specified object in the list.
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@param listAdapter The list adapter requesting this information.
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@param object An object in the list.
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@return A new section controller instance that can be displayed in the list.
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@note New section controllers should be initialized here for objects when asked. You may pass any other data to
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the section controller at this time.
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Section controllers are initialized for all objects whenever the `IGListAdapter` is created, updated, or reloaded.
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Section controllers are reused when objects are moved or updated. Maintaining the `-[IGListDiffable diffIdentifier]`
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guarantees this.
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*/
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- (IGListSectionController *)listAdapter:(IGListAdapter *)listAdapter sectionControllerForObject:(id)object;
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/**
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Asks the data source for a view to use as the collection view background when the list is empty.
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@param listAdapter The list adapter requesting this information.
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@return A view to use as the collection view background, or `nil` if you don't want a background view.
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@note This method is called every time the list adapter is updated. You are free to return new views every time,
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but for performance reasons you may want to retain the view and return it here. The infra is only responsible for
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adding the background view and maintaining its visibility.
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*/
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- (nullable UIView *)emptyViewForListAdapter:(IGListAdapter *)listAdapter;
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@end
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NS_ASSUME_NONNULL_END
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