ios - Need help saving bool to NSUserDefaults and using it in a if statement using Swift -

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i struggling figure out how if statement bool saved nsuserdefaults using swift. believe know how save bool nsuserdefaults confirmation in appreciated. objective-c code trying figure out how use swift.

if(![[nsuserdefaults standarduserdefaults] boolforkey:@"onoroff"]) {     [[nsuserdefaults standarduserdefaults] setbool:yes forkey:@"onoroff"]; }

this have far in swift...

if  nsuserdefaults.standarduserdefaults().objectforkey("onoroff") != nil{     nsuserdefaults.standarduserdefaults().setbool(false, forkey: "onoroff") }

i think might have figure out. can confirm correct way save bool nsuserdefaults , use if statement it. here is...

if  !nsuserdefaults.standarduserdefaults().boolforkey("onoroff"){      nsuserdefaults.standarduserdefaults().setbool(true, forkey: "onoroff") }else{ nsuserdefaults.standarduserdefaults().setbool(false, forkey: "onoroff")      } 

if nsuserdefaults.standarduserdefaults().objectforkey("onoroff") == true

the above code check wheather value of key true or not.

or

if nsuserdefaults.standarduserdefaults().objectforkey("onoroff")

the above code check wheather value of key true or not if there no value key.(means nothing inserted in userdefault of "onoroff").

edit

if !nsuserdefaults.standarduserdefaults().objectforkey("onoroff") {      nsuserdefaults.standarduserdefaults().setbool(true, forkey: "onoroff") } else {     nsuserdefaults.standarduserdefaults().setbool(false, forkey: "onoroff") }

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