Swift Nested If statements do not compile

I need to have a nested "If statements" and cant quite get it to work - keep getting an error - expected expression.

The below code is what i've tried:

if weightLabel.text == "Weight (lbs)" {
      if pickerView == heightPicker {
            let titleRow = height[row]
             return titleRow
      } else if pickerView == weightPicker {
                let titleRow = weight[row]
                return titleRow
              }
         return ""
        else if weightLabel.text == "Weight (kgs)" {
            if pickerView == heightPicker {
                let titleRow = heightCM[row]
                return titleRow
            }
            else if pickerView == weightPicker {
                let titleRow = weightKG[row]
                return titleRow
            }
            return ""
         }
 }

Can someone take a look at my current code and help?