ios - "type of expression is ambiguous without more context" - Referencing appDelegate -

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i have appdelegate written in obj-c. i'm trying access in new swift class, strange error think misleading, , i'm trying root.

in swift file, i've set breakpoint after:

var appdelegate = uiapplication.sharedapplication().delegate

if po:

po appdelegate

i get:

printing description of appdelegate: optional(<appdelegate: 0x7f81a2d1cc40>)

everything fine.

however, when try to:

po appdelegate.navigationcontroller

in debug console get:

error: <expr>:1:13: error: type of expression ambiguous without more context

and navigationcontroller property of appdelegate, declared in original obj-c appdelegate.h file.

here's original question: cannot invoke '...' argument list of type '...'

edit

based on @martin's comment, changed code to: 

  var appdelegate = uiapplication.sharedapplication().delegate!   appdelegate.navigationcontroller.popviewcontrollerisanimated(true)

which brings error:

'uiapplicationdelegate' not have member named 'navigationcontroller'

however, here's obj-c appdelegate.h:

@interface appdelegate : uiresponder <uiapplicationdelegate>  @property (nonatomic,strong) vunavigationcontroller *navigationcontroller;  @property (nonatomic,strong) uiwindow *window;  @end

the delegate method of uiapplication declared as

unowned(unsafe) var delegate: uiapplicationdelegate?

you have cast return value concrete type of application delegate:

let appdelegate = uiapplication.sharedapplication().delegate as! appdelegate

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