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[SR-8543] UIAppearance doesn't allow generic in whenContainedInInstanceOf: #51061

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swift-ci opened this issue Aug 15, 2018 · 1 comment
Open

[SR-8543] UIAppearance doesn't allow generic in whenContainedInInstanceOf: #51061

swift-ci opened this issue Aug 15, 2018 · 1 comment
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself diagnostics QoI Bug: Diagnostics Quality of Implementation type checker Area → compiler: Semantic analysis

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@swift-ci
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Previous ID SR-8543
Radar rdar://problem/43888481
Original Reporter nelsonaa (JIRA User)
Type Bug
Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Bug, DiagnosticsQoI, TypeChecker
Assignee None
Priority Medium

md5: 9d0d1fd9f4271291fe10ae1858692db5

Issue Description:

In the following example code it gives an error of 'Cannot assign value of type 'UIColor' to type 'UIColor!' ' It compiles fine without the generic in ExampleController.

import UIKit

final class ExampleController<T>: UITableViewController { }

UITableView.appearance(whenContainedInInstancesOf: [ExampleController.self]).tintColor = UIColor.blue

Ideally generic classes could be used with UIAppearance. However, the error message should at least reflect the real issue.
@belkadan
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Yeah, you'll have to provide a specific ExampleController here, since the generic name "ExampleController" isn't itself a class at run time. You're totally right about the diagnostic, though.

@swift-ci create

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. compiler The Swift compiler in itself diagnostics QoI Bug: Diagnostics Quality of Implementation type checker Area → compiler: Semantic analysis
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@belkadan @swift-ci