ios - Xcode (Swift) - How to store name of image file on button -

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i trying name image file on uibutton. set image using 

buttonname.setimage(uiimage(named:"bluepiece.png"), forstate: .normal) buttonname.setimage(uiimage(named:"redpiece.png"), forstate: .normal)

and want able compare names of image files in "if statement". also, using swift , xcode 6.4.

complare images :

if(btn.imageview.image == uiimage(named:"bluepiece.png")){     //do stuff here }

or can take 1 boolean variable - set true or false changing , comparing images.


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