ios - 使用textview滚动方法时的EXC_BAD_ACCESS AppDelegate

Question

我有一个弹出窗口，当我滚动 TextView 并关闭弹出窗口时，我在应用程序委托(delegate)中获得 EXC_BAD_ACCESS。

下面的代码用于 TextView 滚动

func textViewDidBeginEditing(textView: UITextView) {
    var scrollPoint : CGPoint = CGPointMake(0.0, textView.frame.origin.y + 300)
    isFormInputChanged = true
    self.contentScrollView.setContentOffset(scrollPoint, animated: true)
}

func textViewDidEndEditing(textView: UITextView) {
    self.contentScrollView.setContentOffset(CGPointZero, animated: true)
}

关闭弹窗的代码

    if isFormInputChanged == true
    {
        var pagetitle = dict[constants.lable.WARNING_TITLE]
        var button1Title = dict[constants.lable.YES]
        var button2Title = dict[constants.lable.NO]
        var alertMessage = dict[constants.lable.alert.CANCEL_UNIT_SAVE_ALERT]
        customControllerWithCancelForm(pagetitle!, button1Title: button1Title!, button2Title: button2Title!, alertMessage: alertMessage!)
    }
    else
    {
        var tmpController :UIViewController! = self.presentingViewController
        self.dismissViewControllerAnimated(false, completion: {()->Void in
            self.unitDetailProtocolVar!.closeUnitDetail()
        });
    }

有人可以告诉我我做错了什么吗？

谢谢，

Answer 1

您进行了过多的强制展开。您应该始终执行可选绑定(bind):

  if isFormInputChanged == true 
  {
    if let pagetitle = dict[constants.lable.WARNING_TITLE],
           button1Title = dict[constants.lable.YES],
           button2Title = dict[constants.lable.NO],
           alertMessage = dict[constants.lable.alert.CANCEL_UNIT_SAVE_ALERT] 
    {
        customControllerWithCancelForm(pagetitle, button1Title: button1Title, button2Title: button2Title, alertMessage: alertMessage)
    }
  }
  else 
  {
    self.dismissViewControllerAnimated(false, completion: { () -> Void in
      if let unitDetailProtocolVar = self.unitDetailProtocolVar {
        unitDetailProtocolVar.closeUnitDetail()
      }
    });
  }