I have just tested this with Xcode 13 and have found that the original answer no longer works. However, I am keeping it for posterity, or those using previous versions of Xcode.
Xcode 13
I have tested this with Xcode 13.0 and verified it works for iPhone and iPad:
let activityListView = app.otherElements.element(matching: .other,
identifier: "ActivityListView")
XCTAssertTrue(activityListView.waitForExistence(timeout: 2.0))
activityListView.buttons["Close"].tap()
Previous versions
After some trial and error, I was able to locate where my specific elements were with the following:
app.otherElements.element(boundBy: 1).buttons.element(boundBy: 0).tap()
Using app.otherElements.element(boundBy: 1)
would identify the share sheet for me. I had attempted to locate it through accessibility identifiers, but I could not find one that worked, including previously valid ones used in iOS 12 and below.
Please note that based on the layout of your screen, the index value
may differ from what I am seeing.
Next, .buttons.element(boundBy: 0).tap()
was used to locate the Close button. I again attempted to use identifiers, but could not find anything that represented the button.
When I attempted to discern additional information through the console while testing, I would always wind up crashing the test. This result was surprising, as I was able to query these elements with Xcode 10.
Ultimately, I would like to find working identifier values so that I can have something that works reliably across products, without the trial and error to find the share sheet's index value.
For iPad
The following will dismiss the popover for an iPad:
app.otherElements["PopoverDismissRegion"].tap()
Failed to synthesize event: Failed to scroll to visible (by AX action) Button, error: Error kAXErrorCannotComplete performing AXAction 2003 on element AX element pid: 3118, elementOrHash.elementID: 4354340448.106. (Underlying Error: Error kAXErrorCannotComplete performing AXAction 2003 on element AX element pid: 3118, elementOrHash.elementID: 4354340448.106)
– Ung