类型 'Int' 不符合协议 'NSCopying'

Question

我正在使用这个 Custom Collection View Layout 实现。我能够运行那个 repo 中的示例就好了，但是当我将 CustomCollectionViewLayout.swift 复制到我自己的项目中时，我在方法

上收到 Type 'Int' does not conform to protocol 'NSCopying' 错误

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

其中 var itemAttributes 是一个 NSMutableArray!

错误是由第二个索引生成的，[indexPath.row]。

有什么想法吗？我试过将相同的函数放在 swift playground 中，但没有出现任何错误..

已更新！ This 是一个 swift 存根，其中保存了我的游乐场。它不执行是因为 Import UIKit，但以下内容：

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)")

产量：

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

将 override func layoutAttributesForItemAtIndexPath 更改为

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 }

我将在今天晚些时候 fork CustomCollectionLayoutView 并制作一个 swift2 副本

类型 'Int' 不符合协议 'NSCopying'

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

nsmutablearray

nscopying

uicollectionviewlayout

swift

swift2