Swift、iboutlet 和自定义控件

Question

我可能正在做一些非常愚蠢的事情，但我似乎无法使用 Interface Builder 将 IBOutlet 变量连接到自定义视图，但只能在 Swift 中使用。

我创建了一个名为 MyView 的类，它从 UIView 扩展而来。在我的控制器中，我有一个 MyView 变量（声明为 @IBOutlet var newView: MyView）。我进入 IB 并将 UIView 拖到窗口上并给它一个 MyView 类。

每当我在 Objective C 中完成类似操作时，我都可以单击应用程序窗口顶部的 View Controller 按钮，选择变量并将其向下拖动到控件以将两者链接在一起。当我在 Swift 中尝试时，它拒绝识别视图存在。

如果我将控制器中的变量类更改为 UIView，它可以正常工作。但不是我的自定义视图。

还有其他人遇到过这个问题吗？它是一个功能，还是只是我的白痴？

控制器代码

import UIKit

class ViewController: UIViewController {

    @IBOutlet var newView:MyView

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

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

查看代码

import UIKit

class MyView: UIView {

    init(frame: CGRect) {
        super.init(frame: frame)
        // Initialization code
    }

    /*
    // Only override drawRect: if you perform custom drawing.
    // An empty implementation adversely affects performance during animation.
    override func drawRect(rect: CGRect)
    {
        // Drawing code
    }
    */

}

Answer 1

我遇到过类似的问题，我认为这部分是缓存问题，部分只是 Xcode6/Swift 问题。我发现需要的第一步是确保在选择“自动”时视图控制器 .swift 文件将加载到助理编辑器中。

当 Xcode 发现这两个文件都已链接时，我有时可以从视图/按钮/等中进行控制拖动。从 IB 到 .swift 文件，但经常不得不从 @IBOutlet var newView:MyView 行的排水沟中的空圆圈拖动到我希望它匹配的视图。

如果您无法在助手编辑器中加载文件，那么我发现执行以下操作通常会起作用：

1. 从 IB 视图中删除自定义类
2. 清理项目（cmd + K）
3. 关闭/重新打开 Xcode
4. 可能再次清洁？
5. 将自定义类添加回视图
6. 希望它有效:)

如果这似乎让你半途而废/无处可去，请添加评论，我会看看它是否会触发我所做的其他事情

Answer 2

在我的情况下，import UIKit 丢失了，添加此行后，我可以再次从 Storyboard 创建一个 IBOutlet。

Answer 3

我遇到了与此线程中描述的问题类似的问题。也许您找到了解决方案，也许没有，但将来遇到此问题的任何人。我发现关键是使用“required init”函数如下：

required init(coder aDecoder: NSCoder) {
    print("DrawerView: required init")
    super.init(coder: aDecoder)!
    screenSize = UIScreen.mainScreen().bounds
    screenWidth = screenSize.width
    screenHeight = screenSize.height
    self.userInteractionEnabled = true
    addCustomGestureRecognizer()
}

这是我的自定义视图的完整类：

导入 UIKit 导入基金会

类 DrawerView: UIView {

var screenSize: CGRect!
var screenWidth: CGFloat!
var screenHeight: CGFloat!

var drawerState: Int = 0

override init (frame : CGRect) {
    print("DrawerView: main init")
    super.init(frame : frame)
}

override func layoutSubviews() {
    print("DrawerView: layoutSubviews")
    super.layoutSubviews()
}

convenience init () {
    self.init(frame:CGRect.zero)
}

required init(coder aDecoder: NSCoder) {
    print("DrawerView: required init")
    super.init(coder: aDecoder)!
    screenSize = UIScreen.mainScreen().bounds
    screenWidth = screenSize.width
    screenHeight = screenSize.height
    self.userInteractionEnabled = true
    addCustomGestureRecognizer()
}

func addCustomGestureRecognizer (){
    print("DrawerView: addCustomGestureRecognizer")
    let swipeDown = UISwipeGestureRecognizer(target: self, action: #selector(self.handleDrawerSwipeGesture(_:)))
    swipeDown.direction = UISwipeGestureRecognizerDirection.Down
    self.addGestureRecognizer(swipeDown)
    let swipeUp = UISwipeGestureRecognizer(target: self, action: #selector(self.handleDrawerSwipeGesture(_:)))
    swipeUp.direction = UISwipeGestureRecognizerDirection.Up
    self.addGestureRecognizer(swipeUp)
    print("DrawerView self: \(self)")
}

func minimizeDrawer(){
    UIView.animateWithDuration(0.25, delay: 0.0, options: .CurveEaseOut, animations: {
        //            let height = self.bookButton.frame.size.height
        //            let newPosY = (self.screenHeight-64)*0.89
        //            print("newPosY: \(newPosY)")
        self.setY(self.screenHeight*0.86)
        }, completion: { finished in
            self.drawerState = 0
            for view in self.subviews {
                if let _ = view as? UIButton {
                    let currentButton = view as! UIButton
                    currentButton.highlighted = false
                } else if let _ = view as? UILabel {
                    let currentButton = view as! UILabel
                    if self.tag == 99 {
                        currentButton.text = "hisotry"
                    } else if self.tag == 999 {
                        currentButton.text = "results"
                    }
                }
            }
    })
}

func handleDrawerSwipeGesture(gesture: UIGestureRecognizer) {
    print("handleDrawerSwipeGesture: \(self.drawerState)")
    if let swipeGesture = gesture as? UISwipeGestureRecognizer {
        switch self.drawerState{
        case 0:
            if swipeGesture.direction == UISwipeGestureRecognizerDirection.Down {
                // nothing to be done, mini and swiping down
                print("mini: !")
            } else {
                // mini and swiping up, should go to underneath city box
                UIView.animateWithDuration(0.25, delay: 0.0, options: .CurveEaseOut, animations: {
                    let toYPos:CGFloat = 128 + 64 + 8
                    self.setY(toYPos)
                    }, completion: { finished in
                        self.drawerState = 1
                        for view in self.subviews {
                            if let _ = view as? UIButton {
                                let currentButton = view as! UIButton
                                currentButton.highlighted = true
                            } else if let _ = view as? UILabel {
                                let currentLabel = view as! UILabel
                                currentLabel.text = "close"
                            }
                        }

                })
            }
            break;
        case 1:
            if swipeGesture.direction == UISwipeGestureRecognizerDirection.Down {
                // open and swiping down
                self.minimizeDrawer()
            } else {
                // open and swiping up, nothing to be done
            }
            break;
        default:
            break;
        }
    }
}

}

希望这会有所帮助...