yothin/csstickyheaderflowlayout

Parallax, Sticky Headers, Growing image heading, done right in one UICollectionViewLayout.

CSStickyHeaderFlowLayout

Parallax, Sticky Headers, Growing image heading, done right in one UICollectionViewLayout.

Installation

CSStickyHeaderFlowLayout is available through CocoaPods, to install it simply add the following line to your Podfile:

pod "CSStickyHeaderFlowLayout"

Alternatively, you can just drag the files from CSStickyHeaderFlowLayout / Classes into your own project.

Usage

To run the example project; clone the repo, and run pod install from the Project directory first.

1. Setting up the Sticky Section Header

Configure your collection view to use CSStickyHeaderFlowLayout. Here's an example on how you to do it in Storyboard.

Now all your section headers will get the sticky effect like table view. You can disable it with one line of code.

@property (nonatomic) BOOL disableStickyHeaders;

2. Setting up the Collection View Header

We'll be using supplementary views for our parallax header. Here's an example on how use a nib file for that purpose:

Register that nib file to your collection view controller in code:

#import "CSStickyHeaderFlowLayout.h"

- (void)viewDidLoad {

    [super viewDidLoad];

    // Locate your layout
    CSStickyHeaderFlowLayout *layout = (id)self.collectionViewLayout;
    if ([layout isKindOfClass:[CSStickyHeaderFlowLayout class]]) {
        layout.parallaxHeaderReferenceSize = CGSizeMake(320, 200);
    }

    // Locate the nib and register it to your collection view
    UINib *headerNib = [UINib nibWithNibName:@"CSGrowHeader" bundle:nil];
    [self.collectionView registerNib:self.headerNib
          forSupplementaryViewOfKind:CSStickyHeaderParallaxHeader
                 withReuseIdentifier:@"header"];

}

Implement -[UICollectionViewDataSource collectionView:viewForSupplementaryElementOfKind:atIndexPath:]

- (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath {

    // Check the kind if it's CSStickyHeaderParallaxHeader
    if ([kind isEqualToString:CSStickyHeaderParallaxHeader]) {

        UICollectionReusableView *cell = [collectionView dequeueReusableSupplementaryViewOfKind:kind
                                                                            withReuseIdentifier:@"header"
                                                                                   forIndexPath:indexPath];

        return cell;

    } else if ([kind isEqualToString:UICollectionElementKindSectionHeader]) {
        // Your code to configure your section header...
    } else {
        // other custom supplementary views
    }
    return nil;
}

That's it. You'll be able to get the header you wanted using the best practice.

Configuring other effects are really just the way how you setup the header cell, by combining different settings in the minimal exposed properties in CSStickyHeaderFlowLayout.h

@property (nonatomic) CGSize parallaxHeaderReferenceSize;
@property (nonatomic) CGSize parallaxHeaderMinimumReferenceSize;
@property (nonatomic) BOOL disableStickyHeaders;

Run the project examples and it'll shows you exactly how you achieve different effects.

Requirements

• Xcode 5
• iOS 7 (I haven't really test on iOS 6 but it should work if you're using iOS 6 compatible Storyboard)

Author

James Tang, [email protected]

License

CSStickyHeaderFlowLayout is available under the MIT license. See the LICENSE file for more info.