Type 'Int' does not conform to protocol 'NSCopying'

Question

I'm using this Custom Collection View Layout implementation. I'm able to run the example in that repo just fine, but when I copy the CustomCollectionViewLayout.swift into my own project, I get a Type 'Int' does not conform to protocol 'NSCopying' error on the method

override func layoutAttributesForItemAtIndexPath(indexPath: NSIndexPath) -> UICollectionViewLayoutAttributes? {
    return self.itemAttributes[indexPath.section][indexPath.row] as? UICollectionViewLayoutAttributes
}

where var itemAttributes is an NSMutableArray!

The error is being generated by the second index, [indexPath.row].

Any ideas? I've tried putting the same function in a swift playground and did not get any errors..

Updated! This is a swiftstub w/ my playground saved in it. It doesn't execute because of the Import UIKit, but the following:

let x = collectionViewLayout.itemAttributes[indexPath.section]
let y = collectionViewLayout.itemAttributes[indexPath.section][indexPath.row]
print( "x's type = \(_stdlib_getDemangledTypeName(x))")
print("x = \(x)")
print( "y's type = \(_stdlib_getDemangledTypeName(y))")
print("y = \(y)")

yields:

x's type = __NSArrayM
x = (
    "<UICollectionViewLayoutAttributes: 0x7fbe6ac041d0> index path: (<NSIndexPath: 0xc000000000000016> {length = 2, path = 0 - 0}); frame = (0 0; 66 30); zIndex = 1024; ",
    "<UICollectionViewLayoutAttributes: 0x7fbe6ac05030> index path: (<NSIndexPath: 0xc000000000200016> {length = 2, path = 0 - 1}); frame = (65 0; 63 30); zIndex = 1023; ",
    "<UICollectionViewLayoutAttributes: 0x7fbe6ae1e2a0> index path: (<NSIndexPath: 0xc000000000400016> {length = 2, path = 0 - 2}); frame = (127 0; 65 30); zIndex = 1023; ",
    "<UICollectionViewLayoutAttributes: 0x7fbe6ac06830> index path: (<NSIndexPath: 0xc000000000600016> {length = 2, path = 0 - 3}); frame = (191 0; 66 30); zIndex = 1023; ",
    "<UICollectionViewLayoutAttributes: 0x7fbe6ae21e50> index path: (<NSIndexPath: 0xc000000000800016> {length = 2, path = 0 - 4}); frame = (256 0; 67 30); zIndex = 1023; ",
    "<UICollectionViewLayoutAttributes: 0x7fbe6ad70f30> index path: (<NSIndexPath: 0xc000000000a00016> {length = 2, path = 0 - 5}); frame = (322 0; 66 30); zIndex = 1023; ",
    "<UICollectionViewLayoutAttributes: 0x7fbe6ac054e0> index path: (<NSIndexPath: 0xc000000000c00016> {length = 2, path = 0 - 6}); frame = (387 0; 66 30); zIndex = 1023; ",
    "<UICollectionViewLayoutAttributes: 0x7fbe6ad72420> index path: (<NSIndexPath: 0xc000000000e00016> {length = 2, path = 0 - 7}); frame = (452 0; 65 30); zIndex = 1023; "
)
y's type = Swift.ImplicitlyUnwrappedOptional<Swift.AnyObject>
y = <UICollectionViewLayoutAttributes: 0x7fbe6ac041d0> index path: (<NSIndexPath: 0xc000000000000016> {length = 2, path = 0 - 0}); frame = (0 0; 66 30); zIndex = 1024; 

Answer 1

change override func layoutAttributesForItemAtIndexPath to

override func layoutAttributesForItemAtIndexPath(indexPath: NSIndexPath) -> UICollectionViewLayoutAttributes? { let row = indexPath.row let x : NSMutableArray = self.itemAttributes[indexPath.section] as! NSMutableArray let l = x[row] as? UICollectionViewLayoutAttributes return l }

I'll fork CustomCollectionLayoutView later today and make a swift2 copy