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[SR-1527] cannot implement QLPreviewControllerDataSource #44136

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mattneub opened this issue May 15, 2016 · 3 comments
Closed

[SR-1527] cannot implement QLPreviewControllerDataSource #44136

mattneub opened this issue May 15, 2016 · 3 comments
Labels
bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself

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@mattneub
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Previous ID SR-1527
Radar None
Original Reporter @mattneub
Type Bug
Status Resolved
Resolution Duplicate

Attachment: Download

Environment

Toolchain: Swift Development Snapshot 2016-05-09 (a)

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

md5: 1a028d59934de3963412e16cc7932632

duplicates:

  • SR-1514 impossible to adopt WKScriptMessageHandler protocol

Issue Description:

This doesn't compile:

import UIKit
import QuickLook

class ViewController: UIViewController, QLPreviewControllerDataSource {
    func numberOfPreviewItems(in controller: QLPreviewController) -> Int {
        return 1
    }
    func previewController(_ controller: QLPreviewController, previewItemAt index: Int) -> QLPreviewItem {
        return NSURL()
    }
}

It should compile. The problem is that no implementation of the argument labels of `previewController(_:previewItemAt:)` satisfies the compiler.
@mattneub
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Presumably related to SR-1526 and others that I've reported where a delegate protocol's requirements cannot be satisfied.

@belkadan
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Consolidating; likely fixed in master.

@mattneub
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mattneub commented Jun 4, 2016

Confirmed that this is fixed in the toolchain release of May 31.

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