ios - Swift - how to concatenate didSelectRow selections from UIPickerView -

i have 2 column picker (miles , tenths)

picker seems work well, cannot seem work out how concatenate selections 2 columns i.e. if user selects 23 first column , 6 second column, want create answer of "23.6"

at moment, either column selection overwrites previous selection.

btw: don't think can append 2 strings because happens if user selects 10ths first?

    let resetpickerdata = [array(0...99), array(0...9)]  // returns number of 'columns' display. func numberofcomponentsinpickerview(pickerview: uipickerview!) -> int{     return 2 }  // returns # of rows in each component.. func pickerview(pickerview: uipickerview!, numberofrowsincomponent component: int) -> int{     return resetpickerdata[component].count }  func pickerview(pickerview: uipickerview!, titleforrow row: int, forcomponent component: int) -> string! {     return string(resetpickerdata[component][row]) }  func pickerview(pickerview: uipickerview!, didselectrow row: int, incomponent component: int) {     //var distance = ?? } 

you'll need keep track of component selection separately concant strings:

var firstcomponentstring = "" var secondcompoentstring = ""  func pickerview(pickerview: uipickerview!, didselectrow row: int, incomponent component: int) {     if component == 0 {         firstcomponentstring = string(resetpickerdata[component][row])     }     else  if component == 1 {         secondcompoentstring = string(resetpickerdata[component][row])     }      var displaystring = "\(firstcomponentstring).\(secondcompoentstring)" }