Redundant @objc Attribute

Objective-C attribute (@objc) is redundant in declaration

• Identifier: redundant_objc_attribute
• Enabled by default: Yes
• Supports autocorrection: Yes
• Kind: idiomatic
• Analyzer rule: No
• Minimum Swift compiler version: 5.0.0
• Default configuration:

  Key	Value
  severity	warning

Non Triggering Examples

@objc private var foo: String? {}

@IBInspectable private var foo: String? {}

@objc private func foo(_ sender: Any) {}

@IBAction private func foo(_ sender: Any) {}

@GKInspectable private var foo: String! {}

private @GKInspectable var foo: String! {}

@NSManaged var foo: String!

@objc @NSCopying var foo: String!

@objcMembers
class Foo {
    var bar: Any?
    @objc
    class Bar: NSObject {
        @objc
        var foo: Any?
    }
}

@objc
extension Foo {
    var bar: Int {
        return 0
    }
}

extension Foo {
    @objc
    var bar: Int { return 0 }
}

@objc @IBDesignable
extension Foo {
    var bar: Int { return 0 }
}

@IBDesignable
extension Foo {
    @objc
    var bar: Int { return 0 }
    var fooBar: Int { return 1 }
}

@objcMembers
class Foo: NSObject {
    @objc
    private var bar: Int {
        return 0
    }
}

@objcMembers
class Foo {
    @objc
    class Bar: NSObject {
        @objc var foo: Any?
    }
}

@objcMembers
class Foo: NSObject {
    @objc class Bar {}
}

extension BlockEditorSettings {
    @objc(addElementsObject:)
    @NSManaged public func addToElements(_ value: BlockEditorSettingElement)
}

@objcMembers
public class Foo: NSObject {
    @objc
    private func handler(_ notification: Notification) {
    }

    func registerForNotifications() {
        NotificationCenter.default.addObserver(self, selector: #selector(handler(_:)), name: nil, object: nil)
    }
}

class Foo: NSObject { }

@objc extension Foo {
    @objc enum Bar: Int {
       case bar
    }

    var bar: Bar { .bar }
}

class Foo: NSObject { }

@objc extension Foo {
    @objc private enum Baz: Int {
      case baz
    }

    private var baz: Baz { .baz }
}

@objcMembers
internal class Foo: NSObject {
    @objc
    private var baz: Int = 1

    var x: Any? {
        value(forKey: "baz")
    }
}

@objcMembers
class Foo: NSObject {
    @objc enum Bar: Int {
       case bar
    }
}

Triggering Examples

↓@objc @IBInspectable private var foo: String? {}

@IBInspectable ↓@objc private var foo: String? {}

↓@objc @IBAction private func foo(_ sender: Any) {}

@IBAction ↓@objc private func foo(_ sender: Any) {}

↓@objc @GKInspectable private var foo: String! {}

@GKInspectable ↓@objc private var foo: String! {}

↓@objc @NSManaged private var foo: String!

@NSManaged ↓@objc private var foo: String!

↓@objc @IBDesignable class Foo {}

@objcMembers
class Foo: NSObject {
    ↓@objc var bar: Any?
}

@objcMembers
class Foo: NSObject {
    ↓@objc var bar: Any?
    ↓@objc var foo: Any?
    @objc
    class Bar {
        @objc
        var foo: Any?
    }
}

@objc
extension Foo {
    ↓@objc
    var bar: Int {
        return 0
    }
}

@objc @IBDesignable
extension Foo {
    ↓@objc
    var bar: Int {
        return 0
    }
}

@objcMembers
class Foo: NSObject {
    @objcMembers
    class Bar: NSObject {
        ↓@objc var foo: Any
    }
}

@objc
extension Foo {
    ↓@objc
    private var bar: Int {
        return 0
    }
}