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，但仅限于Swift。

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类MyView。

每当我在Objective C中完成类似操作时，我就可以点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链接两个在一起。当我在Swift中尝试它时，它拒绝承认视图存在。

如果我将控制器中变量的类更改为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？它是一个特征，还是我的白痴？

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.
    }
}

视图代码

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

我遇到了类似的问题，我认为这部分是一个缓存问题，部分只是一个Xcode6 / Swift问题。我发现需要的第一步是确保在选择“自动”时将视图控制器.swift文件加载到Assistant Editor中。

当Xcode发现两个文件都已链接时，我有时可以控制 - 从视图/按钮/等拖动。从IB到.swift文件，但经常不得不从@IBOutlet var newView:MyView行的阴沟中的空心圆拖到我希望它匹配的视图。

如果你无法在助理编辑器中加载文件，那么我发现执行以下操作通常会有效：

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

如果这似乎让你中途/无处添加评论，我会看到它是否触发了我做的其他事情

Answer 2

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

Answer 3

我遇到了与此主题中描述的问题类似的问题。也许你找到的解决方案可能不是，但是将来会遇到这种情况的人。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 进口基金会

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......

Swift，iboutlet和自定义控件

3 个答案: