带有 Cocoa Touch Framework 的 IBInspectable 无法正常工作？（附代码）

Question

我似乎无法使 "titleText" IBInspectable 属性正常工作。我有一个带有 UILabel 的简单框架视图，我创建了一个 IBInspectable 变量 "titleText"。我注意到可检查的 "layer" 变量按预期工作，但不是我的自定义 "titleText"，它应该使用此框架更新主视图。

问题是：

Interface Builder 没有更新 titleLabel？（即在设计时）即我期待这应该，就像它适用于 "layer" 项目一样。
在运行时，titleLabel 的值也未采用我在 IB 中设置的值。请注意，当我运行时，我得到以下输出，即我的代码发现 "self.titleLabel" 实际上是 nil??

代码摘要

(a) gcCustomView.xib 快照

(b) gcCustomerView.swift

import UIKit

@IBDesignable 
class gcCustomView: UIView {

    @IBOutlet weak var titleLabel: UILabel!
    @IBInspectable var titleText: String = "Default" {
        didSet {
            if  self.titleLabel != nil {
                self.titleLabel.text = titleText
            } else {
                NSLog("Could not set title text as label.text was nil : was trying to set to \(titleText)")
            }
        }
    }


    @IBInspectable var cornerRadius: CGFloat = 0 {
        didSet {
            layer.cornerRadius = cornerRadius
            layer.masksToBounds = cornerRadius > 0
        }
    }
    @IBInspectable var borderWidth: CGFloat = 0 {
        didSet {
            layer.borderWidth = borderWidth
        }
    }
    @IBInspectable var borderColor: UIColor? {
        didSet {
            layer.borderColor = borderColor?.cgColor
        }
    }


    override init(frame: CGRect) {
        super.init(frame: frame)
        commitInit()
    }

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

    // Private

    func commitInit() {
        if self.subviews.count == 0 {
            print("Loading Nib")
            //let bundle = Bundle(forClass: self.dynamicType)
            let bundle = Bundle(for: type(of: self))
            let nib = UINib(nibName: "gcCustomView", bundle: bundle)
            let view = nib.instantiate(withOwner: self, options: nil)[0] as! UIView
            view.frame = bounds
            view.autoresizingMask = [.flexibleWidth, .flexibleHeight]
            addSubview(view)
        }
    }

}

(c) Main.storyboard 快照

Answer 1

如果您想使用 xib，请确保您已在 fileowner

中设置您的 class 名称

先做那个

现在添加class名字

并添加IBOutlet

参考

Answer 2

这是记忆issue.Label这里没有记忆。因此它 returns 0 而不是在自定义 class 中加载笔尖，你应该在 ViewController 中加载它。用以下代码替换您的 gcCustomView。

gcCustomView.swift

import UIKit

@IBDesignable
class gcCustomView: UIView {

    @IBOutlet weak var titleLabel: UILabel!

    override func awakeFromNib() {
        super.awakeFromNib()
        // Initialization code
        if  self.titleLabel != nil {
            self.titleLabel.text = "Default"
        }
        else {
            NSLog("Could not set title text as label.text was nil : was trying to set to default")
        }
    }
    @IBInspectable var cornerRadius: CGFloat = 0 {
        didSet {
            layer.cornerRadius = cornerRadius
            layer.masksToBounds = cornerRadius > 0
        }
    }
    @IBInspectable var borderWidth: CGFloat = 0 {
        didSet {
            layer.borderWidth = borderWidth
        }
    }
    @IBInspectable var borderColor: UIColor? {
        didSet {
            layer.borderColor = borderColor?.cgColor
        }
    }
    override init(frame: CGRect) {
        super.init(frame: frame)
       // commitInit()
    }

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

ViewController.swift

import UIKit

class ViewController: UIViewController {

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

    }
    func loadNib() {
        let obj = Bundle.main.loadNibNamed("gcCustomView", owner: nil, options: nil)?[0] as! gcCustomView
        obj.frame = (self.view.bounds)
        self.view.addSubview(obj)
    }

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

然后构建。它会起作用。

Answer 3

Select gcCustomView.xib File's Owner 将 class 名称更改为 gcCustomerView.

右键单击 Label 从 outlet 拖动到 File Owner

现在右击应该是这样的Label

我做了一个演示项目。它工作正常。如果您仍然有问题，请告诉我。我将在 Github 中上传我的演示项目。

Answer 4

删除自定义视图中的 Keypath 参数，run.It 对我有用。 :)

带有 Cocoa Touch Framework 的 IBInspectable 无法正常工作？（附代码）

IBInspectable with Cocoa Touch Framework not working? (code attached)

xcode8

ios10

ibdesignable

ibinspectable

cocoa-touch

带有 Cocoa Touch Framework 的 IBInspectable 无法正常工作？ （附代码）

IBInspectable with Cocoa Touch Framework not working? (code attached)

xcode8

ios10

ibdesignable

ibinspectable

cocoa-touch

带有 Cocoa Touch Framework 的 IBInspectable 无法正常工作？（附代码）