No overview available.

SDKs

- iOS 13.0+Beta
- macOS 10.15+Beta
- Mac Catalyst 13.0+Beta
- tvOS 13.0+Beta
- watchOS 6.0+Beta
- Xcode 11.0+Beta

Framework

- Swift
UI

Generic Structure# FetchedResults

No overview available.

SDKs

- iOS 13.0+Beta
- macOS 10.15+Beta
- Mac Catalyst 13.0+Beta
- tvOS 13.0+Beta
- watchOS 6.0+Beta
- Xcode 11.0+Beta

Framework

- Swift
UI

`var count: Int`

The number of elements in the collection.

`var first: Result?`

The first element of the collection.

`var indices: Range<Int>`

The indices that are valid for subscripting the collection, in ascending order.

`var is`Empty : Bool

A Boolean value indicating whether the collection is empty.

`var last: Result?`

The last element of the collection.

`var lazy: Lazy`Sequence<FetchedResults<Result>>

A sequence containing the same elements as this sequence, but on which some operations, such as `map`

and `filter`

, are implemented lazily.

`var underestimated`Count : Int

A value less than or equal to the number of elements in the collection.

`func all`Satisfy ((Result) -> Bool) -> Bool

Returns a Boolean value indicating whether every element of a sequence satisfies a given predicate.

`func compact`Map <ElementOfResult>((Result) -> ElementOfResult?) -> [ElementOfResult]

Returns an array containing the non-`nil`

results of calling the given transformation with each element of this sequence.

`func contains(Result) -> Bool`

Returns a Boolean value indicating whether the sequence contains the given element.

`func contains(where: (Result) -> Bool) -> Bool`

Returns a Boolean value indicating whether the sequence contains an element that satisfies the given predicate.

`func difference<C>(from: C) -> Collection`Difference<Result>

Returns the difference needed to produce this collection’s ordered elements from the given collection.

`func difference<C>(from: C, by: (C`.Element, Result) -> Bool) -> CollectionDifference<Result>

Returns the difference needed to produce this collection’s ordered elements from the given collection, using the given predicate as an equivalence test.

`func distance(from: Int, to: Int) -> Int`

Returns the distance between two indices.

`func drop(while: (Result) -> Bool) -> Slice<Fetched`Results<Result>>

Returns a subsequence by skipping elements while `predicate`

returns `true`

and returning the remaining elements.

`func drop`First (Int) -> Slice<FetchedResults<Result>>

Returns a subsequence containing all but the given number of initial elements.

`func drop`Last (Int) -> Slice<FetchedResults<Result>>

Returns a subsequence containing all but the specified number of final elements.

`func elements`Equal <OtherSequence>(OtherSequence) -> Bool

Returns a Boolean value indicating whether this sequence and another sequence contain the same elements in the same order.

`func elements`Equal <OtherSequence>(OtherSequence, by: (Result, OtherSequence.Element) -> Bool) -> Bool

Returns a Boolean value indicating whether this sequence and another sequence contain equivalent elements in the same order, using the given predicate as the equivalence test.

`func enumerated() -> Enumerated`Sequence<FetchedResults<Result>>

Returns a sequence of pairs (*n*, *x*), where *n* represents a consecutive integer starting at zero and *x* represents an element of the sequence.

`func filter((Result) -> Bool) -> [Result]`

Returns an array containing, in order, the elements of the sequence that satisfy the given predicate.

`func first(where: (Result) -> Bool) -> Result?`

Returns the first element of the sequence that satisfies the given predicate.

`func first`Index (of: Result) -> Int?

Returns the first index where the specified value appears in the collection.

`func first`Index (where: (Result) -> Bool) -> Int?

Returns the first index in which an element of the collection satisfies the given predicate.

`func flat`Map <SegmentOfResult>((Result) -> SegmentOfResult) -> [SegmentOfResult.Element]

Returns an array containing the concatenated results of calling the given transformation with each element of this sequence.

`func for`Each ((Result) -> Void)

Calls the given closure on each element in the sequence in the same order as a `for`

-`in`

loop.

`func form`Index (inout Int, offsetBy : Int)

Offsets the given index by the specified distance.

`func form`Index (inout Int, offsetBy : Int, limitedBy : Int) -> Bool

Offsets the given index by the specified distance, or so that it equals the given limiting index.

`func form`Index (after: inout Int)

Replaces the given index with its successor.

`func form`Index (before: inout Int)

Replaces the given index with its predecessor.

`func index(Int, offset`By : Int) -> Int

Returns an index that is the specified distance from the given index.

`func index(Int, offset`By : Int, limitedBy : Int) -> Int?

Returns an index that is the specified distance from the given index, unless that distance is beyond a given limiting index.

`func index(after: Int) -> Int`

Returns the position immediately after the given index.

`func index(before: Int) -> Int`

Returns the position immediately after the given index.

`func index(of: Result) -> Int?`

Returns the first index where the specified value appears in the collection.

`func joined() -> Flatten`Sequence<FetchedResults<Result>>

Returns the elements of this sequence of sequences, concatenated.

`func joined(separator: String) -> String`

Returns a new string by concatenating the elements of the sequence, adding the given separator between each element.

`func joined<Separator>(separator: Separator) -> Joined`Sequence<FetchedResults<Result>>

Returns the concatenated elements of this sequence of sequences, inserting the given separator between each element.

`func joined(separator: String) -> String`

Returns a new string by concatenating the elements of the sequence, adding the given separator between each element.

`func last(where: (Result) -> Bool) -> Result?`

Returns the last element of the sequence that satisfies the given predicate.

`func last`Index (of: Result) -> Int?

Returns the last index where the specified value appears in the collection.

`func last`Index (where: (Result) -> Bool) -> Int?

Returns the index of the last element in the collection that matches the given predicate.

`func lexicographically`Precedes <OtherSequence>(OtherSequence) -> Bool

Returns a Boolean value indicating whether the sequence precedes another sequence in a lexicographical (dictionary) ordering, using the less-than operator (`<`

) to compare elements.

`func lexicographically`Precedes <OtherSequence>(OtherSequence, by: (Result, Result) -> Bool) -> Bool

Returns a Boolean value indicating whether the sequence precedes another sequence in a lexicographical (dictionary) ordering, using the given predicate to compare elements.

`func make`Iterator () -> IndexingIterator<FetchedResults<Result>>

Returns an iterator over the elements of the collection.

`func map<T>((Result) -> T) -> [T]`

Returns an array containing the results of mapping the given closure over the sequence’s elements.

`func max() -> Result?`

Returns the maximum element in the sequence.

`func max(by: (Result, Result) -> Bool) -> Result?`

Returns the maximum element in the sequence, using the given predicate as the comparison between elements.

`func min() -> Result?`

Returns the minimum element in the sequence.

`func min(by: (Result, Result) -> Bool) -> Result?`

Returns the minimum element in the sequence, using the given predicate as the comparison between elements.

`func prefix(Int) -> Slice<Fetched`Results<Result>>

Returns a subsequence, up to the specified maximum length, containing the initial elements of the collection.

`func prefix(through: Int) -> Slice<Fetched`Results<Result>>

Returns a subsequence from the start of the collection through the specified position.

`func prefix(up`To : Int) -> Slice<FetchedResults<Result>>

Returns a subsequence from the start of the collection up to, but not including, the specified position.

`func prefix(while: (Result) -> Bool) -> Slice<Fetched`Results<Result>>

Returns a subsequence containing the initial elements until `predicate`

returns `false`

and skipping the remaining elements.

`func random`Element () -> Result?

Returns a random element of the collection.

`func random`Element <T>(using: inout T) -> Result?

Returns a random element of the collection, using the given generator as a source for randomness.

`func reduce<Result>(Result, (Result, Result) -> Result) -> Result`

Returns the result of combining the elements of the sequence using the given closure.

`func reduce<Result>(into: Result, (inout Result, Result) -> ()) -> Result`

Returns the result of combining the elements of the sequence using the given closure.

`func reversed() -> Reversed`Collection<FetchedResults<Result>>

Returns a view presenting the elements of the collection in reverse order.

`func shuffled() -> [Result]`

Returns the elements of the sequence, shuffled.

`func shuffled<T>(using: inout T) -> [Result]`

Returns the elements of the sequence, shuffled using the given generator as a source for randomness.

`func sorted() -> [Result]`

Returns the elements of the sequence, sorted.

`func sorted(by: (Result, Result) -> Bool) -> [Result]`

Returns the elements of the sequence, sorted using the given predicate as the comparison between elements.

`func split(max`Splits : Int, omittingEmptySubsequences : Bool, whereSeparator : (Result) -> Bool) -> [Slice<FetchedResults<Result>>]

Returns the longest possible subsequences of the collection, in order, that don’t contain elements satisfying the given predicate.

`func split(separator: Result, max`Splits : Int, omittingEmptySubsequences : Bool) -> [ArraySlice<Result>]

Returns the longest possible subsequences of the sequence, in order, around elements equal to the given element.

`func split(separator: Result, max`Splits : Int, omittingEmptySubsequences : Bool) -> [Slice<FetchedResults<Result>>]

Returns the longest possible subsequences of the collection, in order, around elements equal to the given element.

`func starts<Possible`Prefix>( with: PossiblePrefix) -> Bool

Returns a Boolean value indicating whether the initial elements of the sequence are the same as the elements in another sequence.

`func starts<Possible`Prefix>( with: PossiblePrefix, by: (Result, PossiblePrefix.Element) -> Bool) -> Bool

Returns a Boolean value indicating whether the initial elements of the sequence are equivalent to the elements in another sequence, using the given predicate as the equivalence test.

`func suffix(Int) -> Slice<Fetched`Results<Result>>

Returns a subsequence, up to the given maximum length, containing the final elements of the collection.

`func suffix(from: Int) -> Slice<Fetched`Results<Result>>

Returns a subsequence from the specified position to the end of the collection.

`func with`ContiguousStorageIfAvailable <R>((UnsafeBufferPointer<Result>) -> R) -> R?

Call `body(p)`

, where `p`

is a pointer to the collection’s contiguous storage. If no such storage exists, it is first created. If the collection does not support an internal representation in a form of contiguous storage, `body`

is not called and `nil`

is returned.

`subscript<R>(R) -> Slice<Fetched`Results<Result>>

Accesses the contiguous subrange of the collection’s elements specified by a range expression.

`subscript(Range<Int>) -> Slice<Fetched`Results<Result>>

Accesses a contiguous subrange of the collection’s elements.

`struct State`

A persistent value of a given type, through which a view reads and monitors the value.

`struct Environment`Object

A dynamic view property that uses a bindable object supplied by an ancestor view to invalidate the current view whenever the bindable object changes.

Beta Software

This documentation contains preliminary information about an API or technology in development. This information is subject to change, and software implemented according to this documentation should be tested with final operating system software.

Learn more about using Apple's beta software