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[UIKit] Enable nullability and clean up UICollectionViewLayoutAttributes. #24606

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Merged
rolfbjarne merged 1 commit into from
Feb 3, 2026
Merged

[UIKit] Enable nullability and clean up UICollectionViewLayoutAttributes. #24606

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70 changes: 32 additions & 38 deletions src/UIKit/UICollectionViewLayoutAttributes.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -12,62 +12,56 @@
using System.Runtime.CompilerServices;
using CoreGraphics;

// Disable until we get around to enable + fix any issues.
#nullable disable
#nullable enable

namespace UIKit {
public partial class UICollectionViewLayoutAttributes : NSObject {
/// <summary>Creates a layout attributes object of the specified type for the cell at the specified index path.</summary>
/// <typeparam name="T">The type of the layout attributes object to return.</typeparam>
/// <param name="indexPath">The index path describing the cell to create a layout attributes object for.</param>
/// <summary>Creates a layout attributes object of the specified type for the cell at the specified index path.</summary>
/// <returns>A layout attributes object representing the cell at the specified index path.</returns>
/// <remarks>Use this method to create a layout attributes object of a UICollectionViewLayoutAttributes subclass.</remarks>
/// <param name="indexPath">The index path describing the cell to create a layout attributes object for.</param>
/// <returns>A layout attributes object representing the cell at the specified index path.</returns>
/// <remarks>Use this method to create a layout attributes object of a <see cref="UICollectionViewLayoutAttributes" /> subclass.</remarks>
[CompilerGenerated]
public static T CreateForCell<T> (NSIndexPath indexPath) where T : UICollectionViewLayoutAttributes
{
global::UIKit.UIApplication.EnsureUIThread ();
if (indexPath is null)
throw new ArgumentNullException ("indexPath");
T result = (T) Runtime.GetNSObject (ObjCRuntime.Messaging.IntPtr_objc_msgSend_IntPtr (Class.GetHandle (typeof (T)), Selector.GetHandle ("layoutAttributesForCellWithIndexPath:"), indexPath.Handle));
ArgumentNullException.ThrowIfNull (indexPath);
T result = (T) Runtime.GetNSObject (ObjCRuntime.Messaging.IntPtr_objc_msgSend_IntPtr (Class.GetHandle (typeof (T)), Selector.GetHandle ("layoutAttributesForCellWithIndexPath:"), indexPath.Handle))!;
GC.KeepAlive (indexPath);
return result;
}

/// <summary>Creates a layout attributes object of a specific type representing the decoration view.</summary>
/// <typeparam name="T">The type of the layout attributes object to return.</typeparam>
/// <param name="kind">The kind identifier for the decoration view.</param>
/// <param name="indexPath">An index path related to the decoration view.</param>
/// <summary>Creates a layout attributes object of a specific type representing the decoration view.</summary>
/// <returns>A layout attributes object of a specific type that represents the decoration view.</returns>
/// <remarks>Use this method to create a layout attributes object of a specific type representing a decoration view of a specific kind.</remarks>
/// <param name="kind">The kind identifier for the decoration view.</param>
/// <param name="indexPath">An index path related to the decoration view.</param>
/// <returns>A layout attributes object of a specific type that represents the decoration view.</returns>
/// <remarks>Use this method to create a layout attributes object of a specific type representing a decoration view of a specific kind.</remarks>
[CompilerGenerated]
public static T CreateForDecorationView<T> (NSString kind, NSIndexPath indexPath) where T : UICollectionViewLayoutAttributes
{
global::UIKit.UIApplication.EnsureUIThread ();
if (kind is null)
throw new ArgumentNullException ("kind");
if (indexPath is null)
throw new ArgumentNullException ("indexPath");
T result = (T) Runtime.GetNSObject (ObjCRuntime.Messaging.IntPtr_objc_msgSend_IntPtr_IntPtr (Class.GetHandle (typeof (T)), Selector.GetHandle ("layoutAttributesForDecorationViewOfKind:withIndexPath:"), kind.Handle, indexPath.Handle));
ArgumentNullException.ThrowIfNull (kind);
ArgumentNullException.ThrowIfNull (indexPath);
T result = (T) Runtime.GetNSObject (ObjCRuntime.Messaging.IntPtr_objc_msgSend_IntPtr_IntPtr (Class.GetHandle (typeof (T)), Selector.GetHandle ("layoutAttributesForDecorationViewOfKind:withIndexPath:"), kind.Handle, indexPath.Handle))!;
GC.KeepAlive (kind);
GC.KeepAlive (indexPath);
return result;
}

/// <summary>Creates a layout attributes object of a specific type representing the supplementary view.</summary>
/// <typeparam name="T">The type of the layout attributes object to return.</typeparam>
/// <param name="kind">The kind identifier for the supplementary view.</param>
/// <param name="indexPath">An index path for the supplementary view.</param>
/// <summary>Creates a layout attributes object of a specific type representing the supplementary view.</summary>
/// <returns>A layout attributes object of a specific type that represents the supplementary view.</returns>
/// <remarks>Use this method to create a layout attributes object of a specific type representing a supplementary view of the specified.</remarks>
/// <param name="kind">The kind identifier for the supplementary view.</param>
/// <param name="indexPath">An index path for the supplementary view.</param>
/// <returns>A layout attributes object of a specific type that represents the supplementary view.</returns>
/// <remarks>Use this method to create a layout attributes object of a specific type representing a supplementary view of the specified kind.</remarks>
[CompilerGenerated]
public static T CreateForSupplementaryView<T> (NSString kind, NSIndexPath indexPath) where T : UICollectionViewLayoutAttributes
{
global::UIKit.UIApplication.EnsureUIThread ();
if (kind is null)
throw new ArgumentNullException ("kind");
if (indexPath is null)
throw new ArgumentNullException ("indexPath");
T result = (T) Runtime.GetNSObject (ObjCRuntime.Messaging.IntPtr_objc_msgSend_IntPtr_IntPtr (Class.GetHandle (typeof (T)), Selector.GetHandle ("layoutAttributesForSupplementaryViewOfKind:withIndexPath:"), kind.Handle, indexPath.Handle));
ArgumentNullException.ThrowIfNull (kind);
ArgumentNullException.ThrowIfNull (indexPath);
T result = (T) Runtime.GetNSObject (ObjCRuntime.Messaging.IntPtr_objc_msgSend_IntPtr_IntPtr (Class.GetHandle (typeof (T)), Selector.GetHandle ("layoutAttributesForSupplementaryViewOfKind:withIndexPath:"), kind.Handle, indexPath.Handle))!;
GC.KeepAlive (kind);
GC.KeepAlive (indexPath);
return result;
Expand All @@ -85,22 +79,22 @@ static NSString GetKindForSection (UICollectionElementKindSection section)
}
}

/// <summary>Creates a layout attributes object representing the supplementary view.</summary>
/// <param name="section">The supplementary view kind.</param>
/// <param name="indexPath">An index path for the supplementary view.</param>
/// <summary>Creates a layout attributes object representing the supplementary view.</summary>
/// <returns>A layout attributes object that represents the supplementary view.</returns>
/// <remarks>Use this method to create a layout attributes object representing a supplementary view of a specific kind. If you've subclassed UICollectionViewLayoutAttributes and need to return an instance of the subclass, use <see cref="UIKit.UICollectionViewLayoutAttributes.CreateForSupplementaryView(Foundation.NSString,Foundation.NSIndexPath)" /> instead. This method is equivalent to calling CreateForSupplementaryView&lt;UICollectionViewLayoutAttributes&gt;.</remarks>
/// <param name="indexPath">An index path for the supplementary view.</param>
/// <returns>A layout attributes object that represents the supplementary view.</returns>
/// <remarks>Use this method to create a layout attributes object representing a supplementary view of a specific kind. If you've subclassed <see cref="UICollectionViewLayoutAttributes" /> and need to return an instance of the subclass, use <see cref="CreateForSupplementaryView{T}(NSString, NSIndexPath)" /> instead. This method is equivalent to calling <c>CreateForSupplementaryView&lt;UICollectionViewLayoutAttributes&gt;</c>.</remarks>
public static UICollectionViewLayoutAttributes CreateForSupplementaryView (UICollectionElementKindSection section, NSIndexPath indexPath)
{
return CreateForSupplementaryView (GetKindForSection (section), indexPath);
}

/// <summary>Creates a layout attributes object representing the supplementary view.</summary>
/// <typeparam name="T">The type of the layout attributes object to return.</typeparam>
/// <param name="section">The supplementary view kind.</param>
/// <param name="indexPath">An index path for the supplementary view.</param>
/// <summary>Creates a layout attributes object representing the supplementary view.</summary>
/// <returns>A layout attributes object that represents the supplementary view.</returns>
/// <remarks>Use this method to create a layout attributes object of a specific type representing a supplementary view of the specified.</remarks>
/// <param name="section">The supplementary view kind.</param>
/// <param name="indexPath">An index path for the supplementary view.</param>
/// <returns>A layout attributes object that represents the supplementary view.</returns>
/// <remarks>Use this method to create a layout attributes object of a specific type representing a supplementary view of the specified kind.</remarks>
public static T CreateForSupplementaryView<T> (UICollectionElementKindSection section, NSIndexPath indexPath) where T : UICollectionViewLayoutAttributes
{
return CreateForSupplementaryView<T> (GetKindForSection (section), indexPath);
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