Cannot convert value of type ‘ArraySlice<Int>’ to specified type
‘[Int]’

我不知道如何从主阵列中获取[Int]，或者转换ArraySlice< Int>到[Int]。我猜想我错过了一些简单的东西，但似乎找不到文档的答案。

var rowArray = [[Int]]()

var rangeStart = 0
let rangeLength = mapWidth

for var index = 0; index < mapHeight; ++index{
    rangeStart = tileIDs.count - ((index + 1) * mapWidth )

    let row : [Int] = tileIDs[rangeStart...rangeStart+rangeLength]
    rowArray.append(row)
}
rowArray.append(row)