addUIInterruptionMonitor(withDescription:handler:) not working on iOS 10 or 9

Question

The following tests works fine on iOS 11. It dismisses the alert asking permissions to use the locations services and then zooms in in the map. On iOS 10 or 9, it does none

Answer 1

let springboard = XCUIApplication(bundleIdentifier: "com.apple.springboard") 

let allowBtn = springboard.buttons["Allow"]
if allowBtn.waitForExistence(timeout: 10) {
    allowBtn.tap()
}

Update .exists to .waitForExistence(timeout: 10), detail please check comments.

Answer 2

I used the @River2202 solution and it works better than the interruption one. If you decide to use that, I strongly suggest that you use a waiter function. I created this one in order to wait on any kind of XCUIElement to appear:

Try it!

// function to wait for an ui element to appear on screen, with a default wait time of 20 seconds
// XCTWaiter was introduced after Xcode 8.3, which is handling better the timewait, it's not failing the test.  It uses an enum which returns: 'Waiters can be used with or without a delegate to respond to events such as completion, timeout, or invalid  expectation fulfilment.'
@discardableResult
func uiElementExists(for element: XCUIElement, timeout: TimeInterval = 20) -> Bool {
    let expectation = XCTNSPredicateExpectation(predicate: NSPredicate(format: "exists == true"), object: element)
    let result = XCTWaiter().wait(for: [expectation], timeout: timeout)
    guard result == .completed else {
        return false
    }
    return true
}

Answer 3

I had this problem and River2202's solution worked for me.

Note that this is not a fix to get the UIInterruptionMonitor to work, but a different way of dismissing the alert. You may as well remove the addUIInterruptionMonitor setup. You'll need to have the springboard.buttons["Allow"].exists test anywhere the permission alert could appear. If possible, force it to appear at an early stage of the testing so you don't need to worry about it again later.

Happily the springboard.buttons["Allow"].exists code still works in iOS 11, so you can have a single code path and not have to do one thing for iOS 10 and another for iOS 11.

Incidentally, I logged the base issue (that addUIInterruptionMonitor is not working pre-iOS 11) as a bug with Apple. It has been closed as a duplicate now, so I guess they acknowledge that it is a bug.