"String?' is not convertible to 'NSString'" (after Xcode 7 migration)

Question

Hello I'm developing project (finishing it in objective-c) but one class was writed in Swift. After migration to XCODE 7 for ios9 compiler back to me with Error: 'String?' is not convertible to 'NSString' for code:

if let view = self.emailTextField.rightView {
                    if (self.emailTextField.text as NSString).validateEmail() {
                        self.emailTextField.rightView?.alpha = 1
                    } else {
                        self.emailTextField.rightView?.alpha = 0
                    }
                }

Any advice from Swift2 Bosses :) ?

Answer 1

Boss advice:

self.emailTextField.text as NSString becomes self.emailTextField.text! as NSString

:)