swift中需要批量初始化某个数组的值
原先是循环初始化的：
var itemSizeColumnList = [CGSize]() let eachItemSize = CGSize(width: ScreenWidth/CGFloat(collectionViewLayout.numberOfColumns), height: 30) for _ in (1…collectionViewLayout.numberOfColumns) { itemSizeColumnList.append(eachItemSize) } |
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let eachItemSize = CGSize(width: ScreenWidth/CGFloat(collectionViewLayout.numberOfColumns), height: 30) // var itemSizeColumnList = [CGSize]() // for _ in (1…collectionViewLayout.numberOfColumns) { // itemSizeColumnList.append(eachItemSize) // } let itemSizeColumnList = Array<CGSize>(count: collectionViewLayout.numberOfColumns, repeatedValue: eachItemSize) |
即可。
［总结］
批量初始化数组，可以写成：
let batchInitedArray = Array<SomeType>(count: ArrayCount, repeatedValue: initValue) |
比如：
let IntArray10 = Array<SomeType>(count: 10, repeatedValue: 0) |
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