上下文类型“NSFastEnumeration”不能与数组文字一起使用

Swift 3, would you do this?

斯威夫特3,你会这样做吗?

let changeRequest = PHAssetCollectionChangeRequest(...)
let fastEnumeration = NSArray(array: [PHObjectPlaceholder])
albumChangeRequest?.addAssets(fastEnumeration)
l