问Xcode UITest中的PageControl

EN

func testPageIndicator() {
    let app = XCUIApplication()
    app.launch()

    let scrollView = app.scrollViews.element(boundBy: 0)
    let pageIndicator = app.pageIndicators.element(boundBy: 0)

    // test that page indicator is updated when user scrolls to page 2
    scrollView.swipeLeft()
    XCTAssertEqual(pageIndicator.value as? String, "page 2 of 3")

    // test that scrollview scrolls to page 3 when user taps right of the current page in page indicator
    pageIndicator.coordinate(withNormalizedOffset: CGVector(dx: 0.9, dy: 0.2)).tap()
    XCTAssert(app.otherElements["page_3"].waitForExistence(timeout: 2))
    XCTAssertFalse(app.otherElements["page_2"].exists)
    XCTAssertEqual(pageIndicator.value as? String, "page 3 of 3")
}

extension XCUIElement {

    func currentPageAndNumberOfPages() -> (Int, Int)? {
        guard elementType == .pageIndicator, let pageIndicatorValue = value as? String else {
            return nil
        }
        // Extract two numbers. This should be language agnostic.
        // Examples: en:"3 of 5", ja:"全15ページ中10ページ目", es:"4 de 10", etc
        let regex = try! NSRegularExpression(pattern: "^\\D*(\\d+)\\D+(\\d+)\\D*$", options: [])
        let matches = regex.matches(in: pageIndicatorValue, options: [], range: NSRange(location: 0, length: pageIndicatorValue.count))
        if matches.isEmpty {
            return nil
        }
        let group1 = matches[0].range(at: 1)
        let group2 = matches[0].range(at: 2)
        let numberString1 = pageIndicatorValue[Range(group1, in: pageIndicatorValue)!]
        let numberString2 = pageIndicatorValue[Range(group2, in: pageIndicatorValue)!]
        let number1 = Int(numberString1) ?? 0
        let number2 = Int(numberString2) ?? 0
        let numberOfPages = max(number1, number2)
        var currentPage = min(number1, number2)
        // Make it 0 based index
        currentPage = currentPage > 0 ? (currentPage - 1) : currentPage
        return (currentPage, numberOfPages)
    }

    /// return current page index (0 based) of an UIPageControl referred by XCUIElement
    func currentPage() -> Int? {
        return currentPageAndNumberOfPages()?.0 ?? nil
    }

    /// return number of pages of an UIPageControl referred by XCUIElement
    func numberOfPages() -> Int? {
        return currentPageAndNumberOfPages()?.1 ?? nil
    }
}

let pageCount = app.pageIndicators.element(boundBy: 0).numberOfPages() ?? 0
for _ in 0 ..< pageCount {
    app.pageIndicators.element(boundBy: 0).swipeLeft()
}