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# isValid

Whether the Smart Card is valid and accessible from its slot.

```
var isValid: Bool { get }
```

## Discussion

Use Key-Value-Observing to be notified for changes to accessibility, such as when a Smart Card is physically removed from its slot. For more information, see [Key-Value Observing Programming Guide](https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/KeyValueObserving/KeyValueObserving.html#//apple_ref/doc/uid/10000177i).

---

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