In XCUITests, how to wait for existence of several ui elements?

Question

What is the best way to wait for existence of multiple XCUIElements while doing UITests in XCode?

Answer 1

I found this code to be working. We run a loop for a timeout duration, waiting 1 second between the iterations. On every step we check if all the elements exist, return true if they do, continue otherwise.

func waitForExistenceOfAll(elements: [XCUIElement], for timeout: TimeInterval) -> Bool {
        guard elements.count > 0 else {
            return true
        }
        let startTime = NSDate.timeIntervalSinceReferenceDate
        while (NSDate.timeIntervalSinceReferenceDate - startTime <= timeout) {
            var allExist = true
            for element in elements {
                if !element.exists {
                    allExist = false
                    break
                }
            }
            if allExist {
                return true
            }
            sleep(1)
        }
        return false
}