ios - Swift - Assign a UILabel with NSExpression -

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how can assign uilabel in app nsstring expression? attempt was:

@iboutlet weak var imput: uilabel! @iboutlet weak var output: uilabel!

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...

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@ibaction func equal(sender: anyobject) {         calculate = nsexpression(format: imput.text!)         output = calculate.expressionvaluewithobject(nil, context: nil) as! uilabel     }

i had use output.text = ... instead of output = ... , instead of as! uilabel used 2 other variables convert nsexpression double , string.


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