mirror of
https://github.com/Instagram/IGListKit
synced 2026-05-17 06:18:32 +00:00
6faddd99c9
Summary: * Issue: `[IGListAdapter scrollToObject ...]` currently calls `[collectionView layoutIfNeeded]` before scrolling which creates the current visible cells that will no longer be visible after the scroll. This causes perf issues when we scroll immediately after creating the view controller. * Fix: Instead of asking the layout object for the attributes, lets go throught the `UICollectionView`. So if the attributes are not ready, the `UICollectionView` will call `-prepareLayout`, return the attributes, but doesn't generate the cells just yet. Differential Revision: D17326459 fbshipit-source-id: 745942225e0311fea7c3efb07ac1e8b8e0a82996
79 lines
2.3 KiB
Objective-C
79 lines
2.3 KiB
Objective-C
/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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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 "IGListTestSection.h"
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@interface IGListTestSection () <IGListDisplayDelegate>
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@end
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@implementation IGListTestSection
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- (instancetype)init {
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if (self = [super init]) {
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_size = CGSizeMake(100, 10);
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self.displayDelegate = self;
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}
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return self;
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}
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- (NSArray <Class> *)cellClasses {
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return @[UICollectionViewCell.class];
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}
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- (NSInteger)numberOfItems {
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return self.items;
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}
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- (CGSize)sizeForItemAtIndex:(NSInteger)index {
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return self.size;
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}
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- (UICollectionViewCell *)cellForItemAtIndex:(NSInteger)index {
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return [self.collectionContext dequeueReusableCellOfClass:UICollectionViewCell.class
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forSectionController:self
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atIndex:index];
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}
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- (void)didUpdateToObject:(id)object {
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if ([object isKindOfClass:[NSNumber class]]) {
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self.items = [object integerValue];
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}
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}
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- (void)didSelectItemAtIndex:(NSInteger)index {
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self.wasSelected = YES;
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}
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- (void)didDeselectItemAtIndex:(NSInteger)index {
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self.wasDeselected = YES;
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}
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- (void)didHighlightItemAtIndex:(NSInteger)index {
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self.wasHighlighted = YES;
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}
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- (void)didUnhighlightItemAtIndex:(NSInteger)index {
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self.wasUnhighlighted = YES;
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}
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#pragma mark - IGListDisplayDelegate
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- (void)listAdapter:(IGListAdapter *)listAdapter willDisplaySectionController:(IGListSectionController *)sectionController {
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_wasDisplayed = YES;
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}
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- (void)listAdapter:(IGListAdapter *)listAdapter didEndDisplayingSectionController:(IGListSectionController *)sectionController {}
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- (void)listAdapter:(IGListAdapter *)listAdapter willDisplaySectionController:(IGListSectionController *)sectionController
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cell:(UICollectionViewCell *)cell
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atIndex:(NSInteger)index {}
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- (void)listAdapter:(IGListAdapter *)listAdapter didEndDisplayingSectionController:(IGListSectionController *)sectionController
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cell:(UICollectionViewCell *)cell
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atIndex:(NSInteger)index {}
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@end
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