Detox: iOS Simulator how to confirm alert message

Question

I am using Alert from react-native.

How do I get detox to press the "Log out" button on the alert message?

I tried using await element(by.text('Log out')).tap();

But I get "Multiple elements were matched" error. Presumably it finds 3 elements with same label. The original button with label "Log out" used to trigger the alert message, the alert message title, and the alert message button I want detox to press.

Error Trace: [
  {
    "Description" : "Multiple elements were matched: (
    "<UILabel:0x7fe7964db910; AX=Y; AX.label='Log out'; AX.frame={{41, 234}, {238, 20.5}}; AX.activationPoint={160, 244.25}; AX.traits='UIAccessibilityTraitStaticText'; AX.focused='N'; frame={{16, 20}, {238, 20.5}}; opaque; alpha=1; UIE=N; text='Log out'>",
    "<UILabel:0x7fe7964dda90; AX=Y; AX.label='Log out'; AX.frame={{198.5, 322.5}, {58, 20.5}}; AX.activationPoint={227.5, 332.75}; AX.traits='UIAccessibilityTraitStaticText'; AX.focused='N'; frame={{0, 12}, {58, 20.5}}; opaque; alpha=1; UIE=N; text='Log out'>",
    "<RCTText:0x7fe79652f300; AX=Y; AX.label='Log out'; AX.frame={{16, 338.5}, {288, 17}}; AX.activationPoint={160, 347}; AX.traits='UIAccessibilityTraitStaticText'; AX.focused='N'; frame={{0, 0}, {288, 17}}; alpha=1>"
). Please use selection matchers to narrow the selection down to single element.",
    "Error Domain" : "com.google.earlgrey.ElementInteractionErrorDomain",
    "Error Code" : "5",
    "File Name" : "GREYElementInteraction.m",
    "Function Name" : "-[GREYElementInteraction grey_errorForMultipleMatchingElements:withMatchedElementsIndexOutOfBounds:]",
    "Line" : "956"
  }
]

I guess one way is to use .atIndex(), but that means I need to play with indexes every time something changes to determine the correct element.

Is there no better way to address this issue?

Thanks.

Answer 1

After some tinkering I ended up using this:

await element(by.label('Log out').and(by.type('_UIAlertControllerActionView'))).tap();

Not sure if this will work for every iOS version, but seem to work on 10.3 and 11.1