ios - blank screen appears when click on UILabel in swift -

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i'm trying open iphone call screen selected number when click on uilabel hyperlink in swift.

a blank screen appears 1 second , goes. no iphone call screen appears. don't know wrong in code.

code in viewdidload

let strphone = "080 2854 2105"  let attributedphonestr = nsmutableattributedstring(string:strphone, attributes:[nslinkattributename: nsurl(string: "http://aerospace.honeywell.com")!])  lblphonecontact.attributedtext = attributedphonestr  lblphonecontact.userinteractionenabled = true  let gesturerecognizer = uitapgesturerecognizer(target: self, action: selector("labelpressed"))  lblphonecontact.addgesturerecognizer(gesturerecognizer)

function labelpressed

func labelpressed() {        let url:nsurl = nsurl(string: "tel://08028542105")!  uiapplication.sharedapplication().openurl(url)  }

what wrong or missing in code. tried running on iphone device.

for swift use 

let url:nsurl = nsurl(string: "telprompt:08028542105")!

instead of 

let url:nsurl = nsurl(string: "tel://08028542105")!

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