Legacy Objective-C Reference Type

Prefer Swift value types to bridged Objective-C reference types

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

  Key	Value
  severity	warning
  allowed_types	[]

Non Triggering Examples

var array = Array<Int>()

var calendar: Calendar? = nil

var formatter: NSDataDetector

var className: String = NSStringFromClass(MyClass.self)

_ = URLRequest.CachePolicy.reloadIgnoringLocalCacheData

_ = Notification.Name("com.apple.Music.playerInfo")

//
// allowed_types: ["NSData", "NSNumber", "NSURLRequest"]
//

class SLURLRequest: NSURLRequest {
    let data = NSData()
    let number: NSNumber
}

Triggering Examples

var array = ↓NSArray()

var calendar: ↓NSCalendar? = nil

_ = ↓NSURLRequest.CachePolicy.reloadIgnoringLocalCacheData

_ = ↓NSNotification.Name("com.apple.Music.playerInfo")

let keyValuePair: (Int) -> (↓NSString, ↓NSString) = {
  let n = "\($0)" as ↓NSString; return (n, n)
}
dictionary = [↓NSString: ↓NSString](uniqueKeysWithValues:
  (1...10_000).lazy.map(keyValuePair))

extension Foundation.Notification.Name {
    static var reachabilityChanged: Foundation.↓NSNotification.Name {
        return Foundation.Notification.Name("org.wordpress.reachability.changed")
    }
}