Swift - 键盘弹起,遮挡输入框

extension LoginViewController:UITextFieldDelegate {

func textFieldShouldReturn(textField: UITextField) -> Bool {

textField.resignFirstResponder()

//键盘收回，view放下

UIView.animateWithDuration(0.4, animations: {

self.view.frame.origin.y = 0

})

return true

}

func textFieldDidBeginEditing(textView:UITextField) {

//view弹起跟随键盘，高可根据自己定义

UIView.animateWithDuration(0.4, animations: {

self.view.frame.origin.y = -150

})

}

}