Class Delegate Protocol

Delegate protocols should be class-only so they can be weakly referenced

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

  Key	Value
  severity	warning

Non Triggering Examples

protocol FooDelegate: class {}

protocol FooDelegate: class, BarDelegate {}

protocol Foo {}

class FooDelegate {}

@objc protocol FooDelegate {}

@objc(MyFooDelegate)
 protocol FooDelegate {}

protocol FooDelegate: BarDelegate {}

protocol FooDelegate: AnyObject {}

protocol FooDelegate: NSObjectProtocol {}

protocol FooDelegate where Self: BarDelegate {}

protocol FooDelegate where Self: AnyObject {}

protocol FooDelegate where Self: NSObjectProtocol {}

Triggering Examples

↓protocol FooDelegate {}

↓protocol FooDelegate: Bar {}

↓protocol FooDelegate where Self: StringProtocol {}