此类与@IBInspectable不符合键值编码 [英] This class is not key value coding-compliant with @IBInspectable

问题描述

我在自定义视图上创建了一个@ IBDesignable ，以便从IB设置属性。但是我觉得这个课程不符合关键值编码，尽管我班上有这个属性。

I created a @IBDesignable on a custom view to set a property from IB. But i get this class is not key value coding-compliant despite i have that attribute in my class.

@IBDesignable class ExclusiveSelectorView: UIView {
    @IBInspectable var cellWidth: CGFloat?
}

无法设置（cellWidth）用户定义的检查属性（Test.ExclusiveSelectorView） ：[setValue：forUndefinedKey：]：此类不是密钥cellWidth的密钥值编码兼容。

Failed to set (cellWidth) user defined inspected property on (Test.ExclusiveSelectorView): [ setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key cellWidth.

这是我的班级
< img src =https://i.stack.imgur.com/cVRPW.pngalt =在此输入图像说明>

推荐答案

您不能将基元定义为 @IBInspectable 的可为空。

You cannot define primitives as nullable for @IBInspectables.

当您尝试时要这样做，并设置其中一个属性的值，您将在IBDesignable时间收到以下警告：

When you attempt to do so, and set the value for one of these properties, you'll get the following warning at IBDesignable time:

@IBDesignable class TestDesignable
IB Designables：忽略用户定义的运行时attri在TestDesignable实例上为关键路径testInt提供静音。尝试设置其值时遇到异常：[setValue：forUndefinedKey：]：此类不是密钥testInt的密钥值编码兼容。

@IBDesignable class TestDesignable IB Designables: Ignoring user defined runtime attribute for key path "testInt" on instance of "TestDesignable". Hit an exception when attempting to set its value: [ setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key testInt.

在运行时，您将收到以下错误：

And at runtime, you'll get the following error:

无法设置（testInt）用户定义的检查属性（ TestDesignable）：[setValue：forUndefinedKey：]：此类不是密钥testInt的密钥值编码兼容。

Failed to set (testInt) user defined inspected property on (TestDesignable): [ setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key testInt.

修复它，将其从可选更改为非可选，并将其设为零默认值。

To fix it, change it from an optional to non-optional, and give it some zero default value.

无效：

@IBDesignable class TestDesignable: UIView {
  @IBInspectable var testInt: Int? = nil // crash
  @IBInspectable var testFloat: CGFloat? = nil // crash
  @IBInspectable var testPoint: CGPoint? = nil // crash
  @IBInspectable var testColor: UIColor? = nil
}

有效期：

@IBDesignable class TestDesignable: UIView {
  @IBInspectable var testInt: Int = 0
  @IBInspectable var testFloat: CGFloat = 0
  @IBInspectable var testPoint: CGPoint = .zero
  @IBInspectable var testColor: UIColor? = nil
}

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