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This commit is contained in:
Michael Schneider
2016-04-29 07:50:53 -07:00
parent 1f55ef8945
commit 3e8ea64a1b
4 changed files with 72 additions and 127 deletions
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94
AsyncDisplayKit/ASPagerNode.m
View File

@@ -12,26 +12,25 @@
#import "ASPagerFlowLayout.h"
#import "UICollectionViewLayout+ASConvenience.h"
@interface ASPagerNode () <ASCollectionDataSource, ASCollectionViewDelegateFlowLayout, ASDelegateProxyInterceptor, ASPagerFlowLayoutPageProvider>
@interface ASPagerNode () <ASCollectionDataSource, ASCollectionViewDelegateFlowLayout, ASDelegateProxyInterceptor>
{
ASPagerFlowLayout *_flowLayout;
ASPagerNodeProxy *_dataSourceProxy;
ASPagerNodeProxy *_delegateProxy;
ASPagerNodeProxy *_proxy;
__weak id <ASPagerNodeDataSource> _pagerDataSource;
BOOL _pagerDataSourceImplementsNodeBlockAtIndex;
BOOL _pagerDataSourceImplementsConstrainedSizeForNode;
}
@property (nonatomic, assign, readonly) NSInteger numberOfPages;
@end
@implementation ASPagerNode
@dynamic view, delegate, dataSource;
#pragma mark - Lifecycle
- (instancetype)init
{
ASPagerFlowLayout *flowLayout = [[ASPagerFlowLayout alloc] initWithPageProvider:self];
ASPagerFlowLayout *flowLayout = [[ASPagerFlowLayout alloc] init];
flowLayout.scrollDirection = UICollectionViewScrollDirectionHorizontal;
flowLayout.minimumInteritemSpacing = 0;
flowLayout.minimumLineSpacing = 0;
@@ -45,11 +44,12 @@
self = [super initWithCollectionViewLayout:flowLayout];
if (self != nil) {
_flowLayout = flowLayout;
_currentPageIndex = 0;
}
return self;
}
#pragma mark - ASDisplayNode
- (void)didLoad
{
[super didLoad];
@@ -67,10 +67,6 @@
// our view is only horizontally scrollable. This causes UICollectionViewFlowLayout to log a warning.
// From here we cannot disable this directly (UIViewController's automaticallyAdjustsScrollViewInsets).
cv.zeroContentInsets = YES;
// Set the super delegate to the pager for now to inject the scroll delegate calls. If the API consumer
// set's the delegate on the ASPagerNode we add an ASPagerNodeProxy in between in setDelegate:
super.delegate = self;
ASRangeTuningParameters minimumRenderParams = { .leadingBufferScreenfuls = 0.0, .trailingBufferScreenfuls = 0.0 };
ASRangeTuningParameters minimumPreloadParams = { .leadingBufferScreenfuls = 1.0, .trailingBufferScreenfuls = 1.0 };
@@ -83,34 +79,23 @@
[self setTuningParameters:fullPreloadParams forRangeMode:ASLayoutRangeModeFull rangeType:ASLayoutRangeTypeFetchData];
}
#pragma mark - Getter / Setter
#pragma mark - Getters / Setters
- (NSInteger)numberOfPages
- (NSInteger)currentPageIndex
{
return [_pagerDataSource numberOfPagesInPagerNode:self];
return (self.view.contentOffset.x / CGRectGetWidth(self.view.bounds));
}
#pragma mark - Helpers
- (void)scrollToPageAtIndex:(NSInteger)index animated:(BOOL)animated
{
// Prevent an exception to scroll to an index path that is invalid
if (index >= 0 && index < self.numberOfPages) {
NSIndexPath *indexPath = [NSIndexPath indexPathForItem:index inSection:0];
[self.view scrollToItemAtIndexPath:indexPath atScrollPosition:UICollectionViewScrollPositionLeft animated:animated];
_currentPageIndex = index;
}
NSIndexPath *indexPath = [NSIndexPath indexPathForItem:index inSection:0];
[self.view scrollToItemAtIndexPath:indexPath atScrollPosition:UICollectionViewScrollPositionLeft animated:animated];
}
#pragma mark - ASCollectionViewDataSource
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
ASDisplayNodeAssert(_pagerDataSource != nil, @"ASPagerNode must have a data source to load nodes to display");
return self.numberOfPages;
}
- (ASCellNodeBlock)collectionView:(ASCollectionView *)collectionView nodeBlockForItemAtIndexPath:(NSIndexPath *)indexPath
{
ASDisplayNodeAssert(_pagerDataSource != nil, @"ASPagerNode must have a data source to load nodes to display");
@@ -121,6 +106,12 @@
return [_pagerDataSource pagerNode:self nodeBlockAtIndex:indexPath.item];
}
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
ASDisplayNodeAssert(_pagerDataSource != nil, @"ASPagerNode must have a data source to load nodes to display");
return [_pagerDataSource numberOfPagesInPagerNode:self];
}
- (ASSizeRange)collectionView:(ASCollectionView *)collectionView constrainedSizeForNodeAtIndexPath:(NSIndexPath *)indexPath
{
if (_pagerDataSourceImplementsConstrainedSizeForNode) {
@@ -129,7 +120,7 @@
return ASSizeRangeMake(CGSizeZero, self.view.bounds.size);
}
#pragma mark - Proxies
#pragma mark - Data Source Proxy
- (id <ASPagerDataSource>)dataSource
{
@@ -142,59 +133,20 @@
_pagerDataSource = pagerDataSource;
_pagerDataSourceImplementsNodeBlockAtIndex = [_pagerDataSource respondsToSelector:@selector(pagerNode:nodeBlockAtIndex:)];
_pagerDataSourceImplementsConstrainedSizeForNode = [_pagerDataSource respondsToSelector:@selector(pagerNode:constrainedSizeForNodeAtIndexPath:)];
// Data source must implement pagerNode:nodeBlockAtIndex: or pagerNode:nodeAtIndex:
ASDisplayNodeAssertTrue(_pagerDataSourceImplementsNodeBlockAtIndex || [_pagerDataSource respondsToSelector:@selector(pagerNode:nodeAtIndex:)]);
_dataSourceProxy = pagerDataSource ? [[ASPagerNodeProxy alloc] initWithTarget:pagerDataSource interceptor:self] : nil;
_pagerDataSourceImplementsConstrainedSizeForNode = [_pagerDataSource respondsToSelector:@selector(pagerNode:constrainedSizeForNodeAtIndexPath:)];
super.dataSource = (id <ASCollectionDataSource>)_dataSourceProxy;
_proxy = pagerDataSource ? [[ASPagerNodeProxy alloc] initWithTarget:pagerDataSource interceptor:self] : nil;
super.dataSource = (id <ASCollectionDataSource>)_proxy;
}
}
- (void)setDelegate:(id<ASCollectionDelegate>)delegate
{
_delegateProxy = delegate ? [[ASPagerNodeProxy alloc] initWithTarget:delegate interceptor:self] : nil;
super.delegate = (id <ASCollectionDelegate>)_delegateProxy;
}
- (void)proxyTargetHasDeallocated:(ASDelegateProxy *)proxy
{
[self setDataSource:nil];
[self setDelegate:nil];
}
#pragma mark - <ASCollectionDelegate>
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
{
CGFloat pageWidth = CGRectGetWidth(self.view.frame);
_currentPageIndex = floor((self.view.contentOffset.x - pageWidth / 2) / pageWidth) + 1;
}
- (void)scrollViewWillEndDragging:(UIScrollView*)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint*)targetContentOffset
{
CGFloat pageWidth = CGRectGetWidth(self.view.frame);
NSInteger newPageIndex = _currentPageIndex;
if (velocity.x == 0) {
// Handle slow dragging not lifting finger
newPageIndex = floor((targetContentOffset->x - pageWidth / 2) / pageWidth) + 1;
} else {
newPageIndex = velocity.x > 0 ? _currentPageIndex + 1 : _currentPageIndex - 1;
if (newPageIndex < 0) {
newPageIndex = 0;
}
if (newPageIndex > self.view.contentSize.width / pageWidth) {
newPageIndex = ceil(self.view.contentSize.width / pageWidth) - 1.0;
}
}
_currentPageIndex = newPageIndex;
*targetContentOffset = CGPointMake(newPageIndex * pageWidth, targetContentOffset->y);
}
@end