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[SR-5489] Casting Objective-C id to Swift protocol type fails #48061

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swift-ci opened this issue Jul 18, 2017 · 4 comments
Closed

[SR-5489] Casting Objective-C id to Swift protocol type fails #48061

swift-ci opened this issue Jul 18, 2017 · 4 comments
Labels
bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. runtime The Swift Runtime

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@swift-ci
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Previous ID SR-5489
Radar rdar://problem/33467916
Original Reporter SAJim (JIRA User)
Type Bug
Status Resolved
Resolution Duplicate
Environment

Xcode 9.0 beta 3, Swift 4.0

Additional Detail from JIRA
Votes 0
Component/s
Labels Bug, Runtime
Assignee None
Priority Medium

md5: 1ce388562651e8fee22b7ccf96a946a0

duplicates:

  • SR-3871 Protocol passing via objective-c / Any can't be cast back to protocol type

Issue Description:

A Swift struct assigned to an Objective-C id property (Any?) cannot be cast or compared to a Swift protocol type, and must first be cast back to its original type.

protocol AProtocol {
    var title: String {get}
}
struct AStruct: AProtocol {
    var title: String = ""
}

let value: Any? = AStruct()
value is AProtocol // == true

let dragItem = UIDragItem(itemProvider: NSItemProvider())
dragItem.localObject = AStruct() //localObject is of type Any?
dragItem.localObject is AProtocol // == false
dragItem.localObject as? AProtocol // == nil
dragItem.localObject as? AStruct is AProtocol // == true
dragItem.localObject as? AStruct as? AProtocol // != nil
@belkadan
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@jckarter, do you have the dup for this?

@belkadan
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@swift-ci create

@hamishknight
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https://bugs.swift.org/browse/SR-3871 @belkadan?

@belkadan
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Ah, that sounds right! Thanks, Hamish.

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
This issue was closed.
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Labels
bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. runtime The Swift Runtime
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@belkadan @hamishknight @swift-ci