Force Unwrapping

Force unwrapping should be avoided

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

Non Triggering Examples

if let url = NSURL(string: query)

navigationController?.pushViewController(viewController, animated: true)

let s as! Test

try! canThrowErrors()

let object: Any!

@IBOutlet var constraints: [NSLayoutConstraint]!

setEditing(!editing, animated: true)

navigationController.setNavigationBarHidden(!navigationController.navigationBarHidden, animated: true)

if addedToPlaylist && (!self.selectedFilters.isEmpty || self.searchBar?.text?.isEmpty == false) {}

print("\(xVar)!")

var test = (!bar)

var a: [Int]!

private var myProperty: (Void -> Void)!

func foo(_ options: [AnyHashable: Any]!) {

func foo() -> [Int]!

func foo() -> [AnyHashable: Any]!

func foo() -> [Int]! { return [] }

return self

Triggering Examples

let url = NSURL(string: query)↓!

navigationController↓!.pushViewController(viewController, animated: true)

let unwrapped = optional↓!

return cell↓!

let url = NSURL(string: "http://www.google.com")↓!

let dict = ["Boooo": "👻"]
func bla() -> String {
    return dict["Boooo"]↓!
}

let dict = ["Boooo": "👻"]
func bla() -> String {
    return dict["Boooo"]↓!.contains("B")
}

let a = dict["abc"]↓!.contains("B")

dict["abc"]↓!.bar("B")

if dict["a"]↓!↓!↓!↓! {}

var foo: [Bool]! = dict["abc"]↓!

realm.objects(SwiftUTF8Object.self).filter("%K == %@", "柱нǢкƱаم👍", utf8TestString).first↓!

context("abc") {
  var foo: [Bool]! = dict["abc"]↓!
}

open var computed: String { return foo.bar↓! }

return self↓!

[1, 3, 5, 6].first { $0.isMultiple(of: 2) }↓!

map["a"]↓!↓!