android - 如何预览具有非空类型参数的可组合项？

Question

@Composable
fun VerifyScreen(
    email: String,
    navigator: DestinationsNavigator
) {
// .. 

}


@Composable
@Preview
fun VerifyScreenPreview() {
    VerifyScreen("<a href="https://stackoverflow.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="740d1b013406115a150311071b1911" rel="noreferrer noopener nofollow">[email protected]</a>", null)
}

Null can not be a value of a non-null type DestinationsNavigator

当然，您可以通过添加问号来更改类型，但如果这不是一个选项怎么办？

navigator: DestinationsNavigator?

Answer 1

您可以使用库提供的EmptyDestinationsNavigator

@Composable
@Preview
fun VerifyScreenPreview() {
    VerifyScreen("<a href="https://stackoverflow.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="95ecfae0d5e7f0bbf4e2f0e6faf8f0" rel="noreferrer noopener nofollow">[email protected]</a>", EmptyDestinationsNavigator)
}