diff options
| -rw-r--r-- | ios/MullvadVPN/View controllers/Login/AccountTokenInput.swift | 10 | ||||
| -rw-r--r-- | ios/MullvadVPNTests/AccountTokenInputTests.swift | 10 |
2 files changed, 18 insertions, 2 deletions
diff --git a/ios/MullvadVPN/View controllers/Login/AccountTokenInput.swift b/ios/MullvadVPN/View controllers/Login/AccountTokenInput.swift index cccc5a1a75..1fef51a479 100644 --- a/ios/MullvadVPN/View controllers/Login/AccountTokenInput.swift +++ b/ios/MullvadVPN/View controllers/Login/AccountTokenInput.swift @@ -149,7 +149,13 @@ extension AccountTokenInput: UITextFieldDelegate, UITextPasteDelegate { replacementString string: String ) -> Bool { let emptySelection = textField.selectedTextRange?.isEmpty ?? false - let stringRange = Range(range, in: formattedString)! + + // Certain characters such as a backtick can pass through the textField, and appear as an empty string, with a + // range outside of the boundaries of the `formattedString`. Such characters are ignored. + guard let stringRange = Range(range, in: formattedString) else { + updateTextField(textField, notifyDelegate: true) + return false + } replaceCharacters( in: stringRange, @@ -177,7 +183,7 @@ extension AccountTokenInput: UITextFieldDelegate, UITextPasteDelegate { let length = textField.offset(from: textRange.start, to: textRange.end) let nsRange = NSRange(location: location, length: length) - let stringRange = Range(nsRange, in: formattedString)! + guard let stringRange = Range(nsRange, in: formattedString) else { return textRange } replaceCharacters( in: stringRange, diff --git a/ios/MullvadVPNTests/AccountTokenInputTests.swift b/ios/MullvadVPNTests/AccountTokenInputTests.swift index 29f232feb3..40933105eb 100644 --- a/ios/MullvadVPNTests/AccountTokenInputTests.swift +++ b/ios/MullvadVPNTests/AccountTokenInputTests.swift @@ -90,6 +90,16 @@ class AccountTokenInputTests: XCTestCase { XCTAssertEqual(input.formattedString, "1234 0000") XCTAssertEqual(input.caretPosition, 9) } + + func testInvalidCharactersReplacesTextFieldTextWithFormattedString() { + let input = AccountTokenInput(string: kSampleToken) + let invalidRange = NSRange(location: 5, length: 0) + let textField = UITextField() + + _ = input.textField(textField, shouldChangeCharactersIn: invalidRange, replacementString: "") + + XCTAssertEqual(textField.text, input.formattedString) + } } private extension String { |