What is PSCollectionView?

It's a Pinterest style scroll view designed to be used similar to a UITableView.

It supports Portrait and Landscape orientations.

This version is an almost complete rewrite of the layout code to support additional features such as:

1. Multiple sections
2. Section headers and footers
3. Improved performance and reduced memory usage, especially during fast scrolling operations.

Due to the inclusion of multiple section support, this fork is not API compatible with the original PSCollectionView found at https://github.com/ptshih/PSCollectionView. Thanks to Peter Shih (https://github.com/ptshih) for writing the original PSCollectionView which forms the basis of this version.

The rest of this README is the same as the README in the original PSCollectionView repository.

What is PSCollectionViewCell?

It's the equivalent of UITableViewCell

It implements base methods for configuring data and calculating height

Note: You should subclass this!

Want to see this code in a live app?

I use this in my iPhone/iPad app, Lunchbox.

Try it out for free now!

Still confused? Try the Demo app included in this repo: BroBoard

Just open and run in simulator, it works on both iPhone (2 columns) AND iPad (4 columns)

It shows an example of using PSCollectionView and a subclass of PSCollectionViewCell

ARC

This version of PSCollectionView is ARC ready.

How to use:

Here's an example of creating an instance of PSCollectionView

self.collectionView = [[[PSCollectionView alloc] initWithFrame:self.view.bounds] autorelease];
self.collectionView.delegate = self;
self.collectionView.collectionViewDelegate = self;
self.collectionView.collectionViewDataSource = self;
self.collectionView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;

Setting number of columns

// Specify number of columns for both iPhone and iPad
if (isDeviceIPad()) {
    self.collectionView.numColsPortrait = 4;
    self.collectionView.numColsLandscape = 5;
} else {
    self.collectionView.numColsPortrait = 2;
    self.collectionView.numColsLandscape = 3;
}

Add a loading view or label

UIView *loadingLabel = ...
self.collectionView.loadingView = loadingLabel;

Add an empty/error view or label

UIView *emptyView = ...
self.collectionView.emptyView = emptyView;

Add a header view

UIView *headerView = ...
self.collectionView.headerView = headerView;

Add a footer view

UIView *footerView = ...
self.collectionView.footerView = footerView;

Delegate and DataSource

- (PSCollectionViewCell *)collectionView:(PSCollectionView *)collectionView viewAtIndex:(NSInteger)index {
    NSDictionary *item = [self.items objectAtIndex:index];
    
    // You should probably subclass PSCollectionViewCell
    PSCollectionViewCell *v = (PSCollectionViewCell *)[self.collectionView dequeueReusableView];
    if (!v) {
        v = [[[PSCollectionViewCell alloc] initWithFrame:CGRectZero] autorelease];
    }
    
    [v fillViewWithObject:item]
    
    return v;
}

- (CGFloat)heightForViewAtIndex:(NSInteger)index {
    NSDictionary *item = [self.items objectAtIndex:index];

    // You should probably subclass PSCollectionViewCell
    return [PSCollectionViewCell heightForViewWithObject:item inColumnWidth:self.collectionView.colWidth];
}

- (void)collectionView:(PSCollectionView *)collectionView didSelectView:(PSCollectionViewCell *)view atIndex:(NSInteger)index {
    // Do something with the tap
}

License

Copyright (c) 2012 Peter Shih (http://petershih.com)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Questions?

Feel free to send me an email if you have any questions implementing PSCollectionView!