Question

我目前正在构建应用程序的UI而不使用IB或故事板。我有以下层次结构： 1. ViewController：主视图控制器。 2. DrawerViewController：下抽屉菜单的视图控制器。主视图控制器将drawerViewController的视图添加为子视图。 3.添加按钮：这是一个UIButton，它以编程方式添加到drawerViewController的视图中。

问题是如果我点击添加按钮，应用程序崩溃，输出中绝对没有错误消息，除了（lldb）。

我尝试了以下内容：

更改选择器名称和方法名称。
选中选择器方法的名称。
添加和删除了选择器方法的参数。
更改了按钮的名称。
在另一个视图中添加了按钮。

无法使用断点跟踪错误，因为应用程序编译得很好，只有在您单击按钮时应用程序才会崩溃。

这是我创建的用于显示问题的测试项目的链接：

GitHub

的ViewController：

class ViewController: UIViewController //, DrawerDelegate
{

//Lower Drawer.
var drawerView: DrawerView!

var drawerViewHidden: Bool = false
var addButton: UIButton!
var viewHeight: CGFloat! = 0
var viewWidth : CGFloat! = 0
var shownDrawerViewY: CGFloat!
var hiddenDrawerViewY: CGFloat!

init()
{
    super.init(nibName: nil, bundle: nil)
}

required init(coder aDecoder: NSCoder)
{
    super.init(coder: aDecoder)
}



override func viewDidLoad()
{
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    //Setup UI
    setUpUI()
}

override func viewWillAppear(animated: Bool)
{
    super.viewWillAppear(animated);


}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}


//MARK:- UI initialization.
/**
Private function that setsup the UI.
*/
private func setUpUI()
{
    setUpDrawer()
}

//MARK: Drawer setup.

/**
A private function that programatically creataes a drawer and add it to the view.
*/
private func setUpDrawer()
{
    var controller = DrawerViewController(width: self.view.frame.width, height: self.view.frame.height)

    self.view.addSubview(controller.view)
    //Hide
    // toggleDrawer()
}



//MARK:- Delegates.

//MARK: DrawerDelegate methods.
func addButtonClicked(sender: UIButton)
{
    //  toggleDrawer()
}   
}

DrawerViewController

class DrawerViewController: UIViewController
{
    //Drawer variables.
    var drawerViewHidden: Bool = false
    var addPinDrawer: AddPinDrawer!



    var viewHeight: CGFloat! = 0
    var viewWidth : CGFloat! = 0
    var shownDrawerViewY: CGFloat?
    var hiddenDrawerViewY: CGFloat?

    var addButton: UIButton?

    init(width: CGFloat, height: CGFloat)
    {
        super.init(nibName: nil, bundle: nil)

        viewWidth  = width
        viewHeight = height

        setUpUI()
    }

    override func viewDidLoad()
    {
        super.viewDidLoad()

        // Do any additional setup after loading the view.

    }

    override func viewWillAppear(animated: Bool)
    {
        super.viewWillAppear(animated)


    }

    override func didReceiveMemoryWarning()
    {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


    required override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: NSBundle?)
    {
        super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
    }

    required init(coder aDecoder: NSCoder)
    {
        fatalError("init(coder:) has not been implemented")
    }


    //MARK:- UI setup
     func setUpUI()
    {
        setUpDimensions()
        setUpDrawerElements()
//        toggleDrawer()
    }

     func setUpDimensions()
    {
        //Determine the y in the case drawer is shown
        shownDrawerViewY  = viewHeight * 2.0/8.0

        //Determine the height of the drawer.
        let drawerHeight = viewHeight * 6.0/8.0

        //Determine the y in the case drawer is hidden
        hiddenDrawerViewY = viewHeight * 7.4/8.0

        //Create the frame, starting with the drawer shown.
        let frame = CGRectMake(0, shownDrawerViewY!, viewWidth, drawerHeight)
        //Create a new Drawer View.
        self.view = UIView(frame: frame)

        setUpAddButton(frame)



        //Setup the background image of the drawer.
        self.view.backgroundColor = UIColor(patternImage: UIImage(named: Constants.drawerBackgroundImage)!)
    }

    func setUpDrawerElements()
    {
        //Setup the button.
        setUpAddPinDrawer()
    }

    func setUpAddPinDrawer()
    {
        addPinDrawer = AddPinDrawer(frame: CGRectMake(0, 0, self.view.frame.width, self.view.frame.height))
//        self.view.addSubview(addPinDrawer)
    }



    //MARK: Handling drawer toggles
    func toggleDrawer()
    {
        //Toggle the variable.
        drawerViewHidden = !drawerViewHidden

        //If the drawer must be hidden.
        if drawerViewHidden
        {
            hideDrawer()
        }

        //If the drawer must be shown
        else
        {
            showDrawer()
        }
    }

    func hideDrawer()
    {
        //Hide the drawer
        UIView.animateWithDuration(0.6, animations: { () -> Void in
            self.view.frame.origin.y = self.hiddenDrawerViewY!
        })
      //  drawerView.hideDrawer()
    }

    func showDrawer()
    {
        UIView.animateWithDuration(0.6, animations: { () -> Void in
            self.view.frame.origin.y = self.shownDrawerViewY!
        })
      //  drawerView.showDrawer()
    }


    func setUpAddButton(frame: CGRect!)
    {
        //Determine the button dimensions.
        let width:CGFloat = 75.0//1.0/10.0 * viewHeight
        let x = frame.width/2.0 - width/2.0

        //Button background image.
        let background = UIImage(named: Constants.addButtonBackgroundImage)!

        //Create the button.
        addButton = UIButton(frame: CGRectMake(x, -width/2.0, width, width)) as UIButton
//        addButton!.setImage(background, forState: UIControlState.Normal)

        addButton?.backgroundColor = UIColor.yellowColor()

        //Add the event handler.
        addButton!.addTarget(self, action: "buttonAdd:", forControlEvents: .TouchUpInside)


        //Set it rotated.
//        self.addButton!.transform = CGAffineTransformMakeRotation(CGFloat(M_PI_4))


        //Add the button to the subview.
        self.view.addSubview(addButton!)

//        println(addButton!.targetForAction("test", withSender: addButton)!)
    }

    func buttonAdd(sender: UIButton)
    {
        println("Helloooo asdf")
    }
}

Answer 1

我已经解决了这个问题。在启动DrawerViewController时出现了一个小错误。在主视图控制器中，我创建了一个名为DrawerViewController的变量并启动了它的视图。一旦方法完成，该变量将被释放，这意味着不会处理所有事件。导致应用程序崩溃，因为没有办法处理按钮的事件。

解决方案：

使DrawerViewController成为实例变量并在主视图控制器中初始化它。

按钮单击会崩溃整个应用程序

1 个答案: