Created
July 15, 2020 13:32
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A wrapper around PHFetchResult that conforms to various Swift sequence protocols
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| import Photos | |
| final class FetchResult<Object: AnyObject> { | |
| let phFetchResult: PHFetchResult<Object> | |
| init(_ phFetchResult: PHFetchResult<Object>) { | |
| self.phFetchResult = phFetchResult | |
| } | |
| } | |
| extension FetchResult: Sequence { | |
| typealias Iterator = AnyIterator<Object> | |
| typealias Element = Object | |
| func makeIterator() -> Iterator { | |
| var count = 0 | |
| return AnyIterator<Object> { | |
| defer { count += 1 } | |
| if count < self.phFetchResult.count { | |
| return self.phFetchResult.object(at: count) | |
| } else { | |
| return nil | |
| } | |
| } | |
| } | |
| } | |
| extension FetchResult: Collection { | |
| typealias Index = Int | |
| var startIndex: Int { 0 } | |
| var endIndex: Int { phFetchResult.count } | |
| func index(after i: Int) -> Int { i + 1 } | |
| subscript(position: Int) -> Object { | |
| phFetchResult.object(at: position) | |
| } | |
| subscript(bounds: IndexSet) -> [Object] { | |
| phFetchResult.objects(at: bounds) | |
| } | |
| } | |
| extension FetchResult: BidirectionalCollection { | |
| func index(before i: Int) -> Int { i - 1 } | |
| } |
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