---
title: IBInspectable should use proper typing
description: Datadog, the leading service for cloud-scale monitoring.
breadcrumbs: >-
  Docs > Datadog Security > Code Security > Static Code Analysis (SAST) > SAST
  Rules > IBInspectable should use proper typing
---

# IBInspectable should use proper typing

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## Metadata{% #metadata %}

**ID:** `swift-code-style/ibinspectable`

**Language:** Swift

**Severity:** Notice

**Category:** Best Practices

## Description{% #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{% #non-compliant-code-examples %}

```swift
import UIKit

@IBDesignable
class CustomView: UIView {

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

}
```

```swift
@IBInspectable
public var foobar = 2.0 {
}
```

## Compliant Code Examples{% #compliant-code-examples %}

```swift
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
        }
    }
}
```
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