internal CustomViewType(Type customViewType) : base(customViewType, MetadataKinds.Struct)
{
try {
BodyProperty =
customViewType.GetProperty("Body__", BindingFlags.NonPublic | BindingFlags.Instance) ??
customViewType.GetProperty("Body", BindingFlags.Public | BindingFlags.Instance);
if (BodyProperty is null || !BodyProperty.CanRead || BodyProperty.CanWrite || !BodyProperty.PropertyType.IsSubclassOf(typeof(View)))
{
throw new ArgumentException($"View implementations must either have a {nameof (SwiftImportAttribute)}, or declare a public, read-only `Body` property returning a concrete type of `{nameof (View)}`");
}
BodyNullability = Nullability.Of(BodyProperty);
BodySwiftType = SwiftType.Of(BodyProperty.PropertyType, BodyNullability) !;
var thunkMetadata = (CustomViewMetadata *)fullMetadata;
thunkMetadata->ThunkViewU = Metadata;
thunkMetadata->ThunkViewT = BodySwiftType.Metadata;
// Currently unused, so don't force allocation if it's a custom view
//thunkMetadata->ThunkViewTViewConformance = swiftBodyType.ViewConformance;
thunkMetadata->ThunkViewTViewConformance = null;
// Proactively create View conformance. While generics that are explicitly constrained to View
// have the conformance passed in, other cases, such as TupleView, look up the conformance
// dynamically, so it's important to register it eagerly.
ViewConformance = CreateViewConformance();
} catch {
// Ensure we don't leak allocated unmanaged memory
Dispose(true);
throw;
}
}
static void AssertField(string fieldName, Nullability expected)
{
var fld = typeof(NullabilityTests).GetField(fieldName, BindingFlags.Instance | BindingFlags.NonPublic) !;
Assert.True(Nullability.Of(fld) == expected, fieldName);
}
static void AssertFieldType(string fieldName)
{
var fld = GetField(fieldName);
Assert.NotNull(SwiftType.Of(fld.FieldType, Nullability.Of(fld)));
}
static void AssertField(string fieldName, Nullability expected)
{
var fld = GetField(fieldName);
Assert.True(Nullability.Of(fld) == expected, fieldName);
}