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# makeWindowsPerform(_:inOrder:)

Sends the specified message to each of the app’s window objects until one returns a non-`nil` value.

```
func makeWindowsPerform(_ selector: Selector, inOrder: Bool) -> NSWindow?
```

## Parameters

`selector`

The selector to perform on each window. This method must not take any arguments and must return a value whose type that can be compared to `nil`.

`inOrder`

If <doc://com.apple.documentation/documentation/Swift/true>, the `aSelector` message is sent to each of the window server’s onscreen windows, going in z-order, until one returns a non-`nil` value. A minimized window is not considered to be onscreen for this check. If <doc://com.apple.documentation/documentation/Swift/false>, the message is sent to all windows in `NSApp`’s window list, regardless of whether or not they are onscreen. This order is unspecified.

## Return Value

The window that returned a non-`nil` value or `nil` if all windows returned nil from `aSelector`.

## See Also

[`tryToPerform(_:with:)`](/documentation/AppKit/NSApplication/tryToPerform(_:with:))

Dispatches an action message to the specified target.

[`sendAction(_:to:from:)`](/documentation/AppKit/NSApplication/sendAction(_:to:from:))

Sends the given action message to the given target.


---

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