StackOverflow2013

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2013-01-23T21:55:38.897
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2013-01-24T04:39:45.833
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2013-01-24T04:39:45.833
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<p>If you have a single header view that you want pinned to the top of your UICollectionView, here's a relatively simple way to do it. Note this is meant to be as simple as possible - it assumes you are using a single header in a single section.</p> <pre><code>//Override UICollectionViewFlowLayout class @interface FixedHeaderLayout : UICollectionViewFlowLayout @end @implementation FixedHeaderLayout //Override shouldInvalidateLayoutForBoundsChange to require a layout update when we scroll - (BOOL) shouldInvalidateLayoutForBoundsChange:(CGRect)newBounds { return YES; } //Override layoutAttributesForElementsInRect to provide layout attributes with a fixed origin for the header - (NSArray *) layoutAttributesForElementsInRect:(CGRect)rect { NSMutableArray *result = [[super layoutAttributesForElementsInRect:rect] mutableCopy]; //see if there's already a header attributes object in the results; if so, remove it NSArray *attrKinds = [result valueForKeyPath:@"representedElementKind"]; NSUInteger headerIndex = [attrKinds indexOfObject:UICollectionElementKindSectionHeader]; if (headerIndex != NSNotFound) { [result removeObjectAtIndex:headerIndex]; } CGPoint const contentOffset = self.collectionView.contentOffset; CGSize headerSize = self.headerReferenceSize; //create new layout attributes for header UICollectionViewLayoutAttributes *newHeaderAttributes = [UICollectionViewLayoutAttributes layoutAttributesForSupplementaryViewOfKind:UICollectionElementKindSectionHeader withIndexPath:[NSIndexPath indexPathForItem:0 inSection:0]]; CGRect frame = CGRectMake(0, contentOffset.y, headerSize.width, headerSize.height); //offset y by the amount scrolled newHeaderAttributes.frame = frame; newHeaderAttributes.zIndex = 1024; [result addObject:newHeaderAttributes]; return result; } @end </code></pre> <p>See: <a href="https://gist.github.com/4613982" rel="noreferrer">https://gist.github.com/4613982</a></p>
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1. POHow to make Supplementary View float in UICollectionView as Section Headers do in UITableView plain style
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1. USMikeV
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1. USMikeV
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