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thomasdegry/gist:6734f763fba5fa17ce96

Created April 22, 2015 22:01
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gistfile1.swift
collectionView.performBatchUpdates({ () -> Void in
if components.weekOfYear < 0 {
collectionView.deleteSections(NSIndexSet(indexesInRange: NSRange(location: collectionView.numberOfSections() - abs(components.weekOfYear), length: abs(components.weekOfYear))))
collectionView.insertSections(NSIndexSet(indexesInRange: NSRange(location: 0, length: abs(components.weekOfYear))))
} else {
collectionView.insertSections(NSIndexSet(indexesInRange: NSRange(location: collectionView.numberOfSections(), length: abs(components.weekOfYear))))
collectionView.deleteSections(NSIndexSet(indexesInRange: NSRange(location: 0, length: abs(components.weekOfYear))))
}
}, completion: { (finished) -> Void in
println("finished batch update")
})
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