-[UIAutomationHelper acknowledgeSystemAlertWithIndex] Does Not Work In Xcode 11.1

[patmalt]

Related to #1125

The fix implemented in #1126, helped but does not completely solve the issue that system alerts cannot be dismissed.

The fix allows ![alert isKindOfClass:[self nilElementClass]] to pass. However, [self _alertIsValidAndVisible:alert] still fails. Also, alert.buttons.count is zero, so isIndexInRange is false.

It appears [[alert valueForKeyPath:@"isVisible"] boolValue] is throwing, in _alertIsValidAndVisible. Additionally, calling [alert isVisible] returns false, but does not throw.

KIF/Classes/UIAutomationHelper.m

Lines 149 to 152 in 5735ec4

	UIAAlert *alert = [self currentSystemAlert];
	BOOL isIndexInRange = index < alert.buttons.count;
	if (![alert isKindOfClass:[self nilElementClass]] && [self _alertIsValidAndVisible:alert] && isIndexInRange) {

KIF/Classes/UIAutomationHelper.m

Lines 204 to 207 in 5735ec4

	@try {
	visible = [[alert valueForKeyPath:@"isVisible"] boolValue];
	}
	@catch (NSException *exception) { }

[justinseanmartin]

@patmalt - Please try out the latest master version of KIF and see if the latest PR merged fixes your issue, and reopen if the issue persists. Thanks!

I'll make a release with Xcode 11 fixes once things settle down and things are confirmed to be working as expected.