IBInspectable should use proper typing

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Metadata

ID: swift-code-style/ibinspectable

Language: Unknown

Severity: Notice

Category: Best Practices

Description

Properties of @IBInspectable attribute must use the correct data type. This rule is vital because using the correct data type for @IBInspectable properties can prevent runtime errors and misbehavior of the application. It also ensures that the properties are correctly displayed and editable in Interface Builder, which aids in the visual design of the user interface.

Non-Compliant Code Examples

import UIKit

@IBDesignable
class CustomView: UIView {

    @IBInspectable var cornerRadius: Foobar = 0 {
        didSet {
            self.layer.cornerRadius = cornerRadius
            self.layer.masksToBounds = cornerRadius > 0
        }
    }

}

@IBInspectable
public var foobar = 2.0 {
}

Compliant Code Examples

import UIKit

@IBDesignable
class CustomView: UIView {

    @IBInspectable var cornerRadius: CGFloat = 0 {
        didSet {
            self.layer.cornerRadius = cornerRadius
            self.layer.masksToBounds = cornerRadius > 0
        }
    }

    @IBInspectable var borderWidth: CGFloat = 0 {
        didSet {
            self.layer.borderWidth = borderWidth
        }
    }

    @IBInspectable var borderColor: UIColor = UIColor.clear {
        didSet {
            self.layer.borderColor = borderColor.cgColor
        }
    }

    @IBInspectable var shadowColor: UIColor = UIColor.black {
        didSet {
            self.layer.shadowColor = shadowColor.cgColor
        }
    }

    @IBInspectable var shadowOpacity: Float = 0 {
        didSet {
            self.layer.shadowOpacity = shadowOpacity
        }
    }

    @IBInspectable var shadowOffset: CGSize = CGSize(width: 0, height: 0) {
        didSet {
            self.layer.shadowOffset = shadowOffset
        }
    }

    @IBInspectable var shadowRadius: CGFloat = 0 {
        didSet {
            self.layer.shadowRadius = shadowRadius
        }
    }
}