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UICollectionView
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@maciejoczko #UICollectionViewWarsaw
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INTRO
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UICollectionView
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UICollectionView + Flow Layout
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iOS 6 Introduced in
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UI != NS
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UITableView New
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UITableView Sibling of
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UIScrollView UICollectionView UITableView
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is mostly about UICollectionView
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GRIDS
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GRIDS
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GRIDS
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MORE GRIDS
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OTHERS
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No content
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UI
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cell supplementary view decoration view
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cell No predefined cell styles New way of creation Tied to content
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supplementary view Tied to data but separate from cells View of a kind
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decoration view Not tied to content
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cell supplementary view decoration view recap
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Layout UICollectionView
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Layout animations
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Layout transitions
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Layout posi tion
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Layout Subclassing
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UICollectionViewLayoutAttributes
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UICollectionViewLayoutAttributes frame
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UICollectionViewLayoutAttributes frame alpha
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UICollectionViewLayoutAttributes frame alpha zIndex
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UICollectionViewLayoutAttributes frame alpha zIndex center
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UICollectionViewLayoutAttributes frame alpha zIndex center size
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UICollectionViewLayoutAttributes frame alpha zIndex center size hidden
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UICollectionViewLayoutAttributes frame alpha zIndex center size hidden transform 3D
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Layout animations recap transitions positioning subclassing
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Collection
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UICollectionView DataSource
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DataSource collectionView:cellForItemAtIndexPath: collectionView:numberOfItemsInSection: collectionView:viewForSupplementaryElementOfKind: atIndexPath: numberOfSectionsInCollectionView:
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DataSource collectionView:cellForItemAtIndexPath: collectionView:numberOfItemsInSection: collectionView:viewForSupplementaryElementOfKind: atIndexPath: numberOfSectionsInCollectionView:
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collectionView:cellForItemAtIndexPath: { MyCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@”MY_CELL_ID”]; if (!cell) { cell = . . . } // Configure the cell's content return cell; }
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collectionView:cellForItemAtIndexPath: { MyCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@”MY_CELL_ID”]; if (!cell) { cell = . . . } // Configure the cell's content return cell; }
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collectionView:cellForItemAtIndexPath: { MyCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@”MY_CELL_ID”]; // Configure the cell's content return cell; }
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collectionView:cellForItemAtIndexPath: { MyCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@”MY_CELL_ID”]; // Configure the cell's content return cell; }
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collectionView:cellForItemAtIndexPath: { MyCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@”MY_CELL_ID” forIndexPath:indexPath]; // Configure the cell's content return cell; }
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collectionView:cellForItemAtIndexPath: { MyCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@”MY_CELL_ID” forIndexPath:indexPath]; // Configure the cell's content return cell; }
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[collectionView registerClass:[MyCell class] forCellWithReuseIdentifier:@“MY_CELL_ID”]
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[collectionView registerClass:[MyCell class] forSupplementaryViewOfKind:@“MY_KIND” withReuseIdentifier:@“MY_CELL_ID”]
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[collectionView registerClass:[MyCell class] forDecorationViewOfKind:@“MY_KIND”
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The same pattern in UITableView since iOS6
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View
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UICollectionView Delegate
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Delegate Layout transition callback Tracking the removal of views Menu actions callbacks Selection & highlight tracking callbacks
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Layout Flow
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Layout Flow UICollectionView
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Layout Line oriented
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group of lines grid OR
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Predefined supplementary views HEADER FOOTER
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Customization
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itemSize
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minimum inter item spacing 10 10
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minimum line spacing 10 10
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scroll direction HORIZONTAL VERTICAL
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HEADER FOOTER reference sizes
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section insets
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UICollectionViewFlowLayout instance properties setting values UICollectionViewDelegateFlowLayout
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Powerful Flow Layout is
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Thanks! @maciejoczko
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CREDITS screenshots: native apps & AppStore color palette: electrikmonk http://www.colourlovers.com/palette/1930/cheer_up_emo_kid Q&A
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https://github.com/literator/ UICollectionViewWorkshop