ios - Whats wrong here: Instance member cannot be used on type -
this question has answer here:
i have following code , i'm confused error message:
instance member 'mydate' cannot used on type 'tableviewcontroller' code:
class tableviewcontroller: uitableviewcontroller { let mydate = nsdate() let items = [ (1, 9, 7, "a", mydate), (2, 9, 7, "b", mydate), (3, 9, 7, "c", mydate), (4, 9, 7, "d", mydate) ] when write following, can build don't know why oder snippet not working:
class tableviewcontroller: uitableviewcontroller { let mydate = nsdate() let items = [ (1, 9, 7, "a", nil), (2, 9, 7, "b", mydate), (3, 9, 7, "c", mydate), (4, 9, 7, "d", mydate) ]
the problem here using self before class initialised. can either have getter called every time access variable or compute lazily.
here code:
class tableviewcontroller: uitableviewcontroller { let mydate = nsdate() var items : [(int,int,int,string,nsdate)] { { return [ (1, 9, 7, "a", mydate), (2, 9, 7, "b", mydate), (3, 9, 7, "c", mydate), (4, 9, 7, "d", mydate) ] } } } lazy computation:
class tableviewcontroller: uitableviewcontroller { let mydate = nsdate() lazy var items : [(int,int,int,string,nsdate)] = { return [ (1, 9, 7, "a", self.mydate), (2, 9, 7, "b", self.mydate), (3, 9, 7, "c", self.mydate), (4, 9, 7, "d", self.mydate) ] }() } 
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