diff --git a/examples/window/main.rs b/examples/window/main.rs
index f53978bc..6852c7e3 100644
--- a/examples/window/main.rs
+++ b/examples/window/main.rs
@@ -34,9 +34,9 @@ fn prepare_pipeline_state<'a>(device: &DeviceRef, library: &LibraryRef) -> Rende
     pipeline_state_descriptor.set_vertex_function(Some(&vert));
     pipeline_state_descriptor.set_fragment_function(Some(&frag));
     pipeline_state_descriptor
-        .color_attachments()
-        .object_at(0)
-        .unwrap()
+        .color_attachments()[0]
+        // .object_at(0)
+        // .unwrap()
         .set_pixel_format(MTLPixelFormat::BGRA8Unorm);
 
     device
@@ -44,10 +44,16 @@ fn prepare_pipeline_state<'a>(device: &DeviceRef, library: &LibraryRef) -> Rende
         .unwrap()
 }
 
+fn ppd(desc: &mut RenderPassDescriptorRef) {
+    // let color_attachment = &desc.color_attachments()[0];
+    desc.color_attachments()[0] = desc.color_attachments()[0].to_owned();
+}
+
 fn prepare_render_pass_descriptor(descriptor: &RenderPassDescriptorRef, texture: &TextureRef) {
     //descriptor.color_attachments().set_object_at(0, MTLRenderPassColorAttachmentDescriptor::alloc());
     //let color_attachment: MTLRenderPassColorAttachmentDescriptor = unsafe { msg_send![descriptor.color_attachments().0, _descriptorAtIndex:0] };//descriptor.color_attachments().object_at(0);
-    let color_attachment = descriptor.color_attachments().object_at(0).unwrap();
+    let color_attachment = &descriptor.color_attachments()[0];
+
 
     color_attachment.set_texture(Some(texture));
     color_attachment.set_load_action(MTLLoadAction::Clear);
@@ -133,9 +139,9 @@ fn main() {
                 encoder.end_encoding();
 
                 render_pass_descriptor
-                    .color_attachments()
-                    .object_at(0)
-                    .unwrap()
+                    .color_attachments()[0]
+                    // .object_at(0)
+                    // .unwrap()
                     .set_load_action(MTLLoadAction::DontCare);
 
                     let encoder = command_buffer.new_render_command_encoder(&render_pass_descriptor);
diff --git a/src/pipeline/compute.rs b/src/pipeline/compute.rs
index 3ffefe43..608833a4 100644
--- a/src/pipeline/compute.rs
+++ b/src/pipeline/compute.rs
@@ -261,13 +261,28 @@ foreign_obj_type! {
     pub struct AttributeDescriptorArrayRef;
 }
 
-impl AttributeDescriptorArrayRef {
-    pub fn object_at(&self, index: usize) -> Option<&AttributeDescriptorRef> {
+// impl AttributeDescriptorArrayRef {
+//     pub fn object_at(&self, index: NSUInteger) -> Option<&AttributeDescriptorRef> {
+//         unsafe { msg_send![self, objectAtIndexedSubscript: index] }
+//     }
+
+//     pub fn set_object_at(&self, index: NSUInteger, buffer_desc: Option<&AttributeDescriptorRef>) {
+//         unsafe { msg_send![self, setObject:buffer_desc atIndexedSubscript:index] }
+//     }
+// }
+
+
+impl std::ops::Index<NSUInteger> for AttributeDescriptorArrayRef {
+    type Output = AttributeDescriptor;
+
+    fn index(&self, index: NSUInteger) -> &Self::Output {
         unsafe { msg_send![self, objectAtIndexedSubscript: index] }
     }
+}
 
-    pub fn set_object_at(&self, index: usize, buffer_desc: Option<&AttributeDescriptorRef>) {
-        unsafe { msg_send![self, setObject:buffer_desc atIndexedSubscript:index] }
+impl std::ops::IndexMut<NSUInteger> for AttributeDescriptorArrayRef {
+    fn index_mut(&mut self, index: NSUInteger) -> &mut Self::Output {
+        unsafe { msg_send![self, objectAtIndexedSubscript: index] }
     }
 }
 
@@ -313,13 +328,17 @@ foreign_obj_type! {
     pub struct BufferLayoutDescriptorArrayRef;
 }
 
-impl BufferLayoutDescriptorArrayRef {
-    pub fn object_at(&self, index: usize) -> Option<&BufferLayoutDescriptorRef> {
+impl std::ops::Index<NSUInteger> for BufferLayoutDescriptorArrayRef {
+    type Output = BufferLayoutDescriptor;
+
+    fn index(&self, index: NSUInteger) -> &Self::Output {
         unsafe { msg_send![self, objectAtIndexedSubscript: index] }
     }
+}
 
-    pub fn set_object_at(&self, index: usize, buffer_desc: Option<&BufferLayoutDescriptorRef>) {
-        unsafe { msg_send![self, setObject:buffer_desc atIndexedSubscript:index] }
+impl std::ops::IndexMut<NSUInteger> for BufferLayoutDescriptorArrayRef {
+    fn index_mut(&mut self, index: NSUInteger) -> &mut Self::Output {
+        unsafe { msg_send![self, objectAtIndexedSubscript: index] }
     }
 }
 
diff --git a/src/pipeline/mod.rs b/src/pipeline/mod.rs
index 91f336fc..0cc62805 100644
--- a/src/pipeline/mod.rs
+++ b/src/pipeline/mod.rs
@@ -37,13 +37,27 @@ foreign_obj_type! {
     pub struct PipelineBufferDescriptorArrayRef;
 }
 
-impl PipelineBufferDescriptorArrayRef {
-    pub fn object_at(&self, index: NSUInteger) -> Option<&PipelineBufferDescriptorRef> {
+// impl PipelineBufferDescriptorArrayRef {
+//     pub fn object_at(&self, index: NSUInteger) -> Option<&PipelineBufferDescriptorRef> {
+//         unsafe { msg_send![self, objectAtIndexedSubscript: index] }
+//     }
+
+//     pub fn set_object_at(&self, index: NSUInteger, buffer_desc: Option<&PipelineBufferDescriptorRef>) {
+//         unsafe { msg_send![self, setObject:buffer_desc atIndexedSubscript:index] }
+//     }
+// }
+
+impl std::ops::Index<NSUInteger> for PipelineBufferDescriptorArrayRef {
+    type Output = PipelineBufferDescriptor;
+
+    fn index(&self, index: NSUInteger) -> &Self::Output {
         unsafe { msg_send![self, objectAtIndexedSubscript: index] }
     }
+}
 
-    pub fn set_object_at(&self, index: NSUInteger, buffer_desc: Option<&PipelineBufferDescriptorRef>) {
-        unsafe { msg_send![self, setObject:buffer_desc atIndexedSubscript:index] }
+impl std::ops::IndexMut<NSUInteger> for PipelineBufferDescriptorArrayRef {
+    fn index_mut(&mut self, index: NSUInteger) -> &mut Self::Output {
+        unsafe { msg_send![self, objectAtIndexedSubscript: index] }
     }
 }
 
diff --git a/src/pipeline/render.rs b/src/pipeline/render.rs
index b3efe594..788fac13 100644
--- a/src/pipeline/render.rs
+++ b/src/pipeline/render.rs
@@ -403,19 +403,34 @@ foreign_obj_type! {
     pub struct RenderPipelineColorAttachmentDescriptorArrayRef;
 }
 
-impl RenderPipelineColorAttachmentDescriptorArrayRef {
-    pub fn object_at(&self, index: NSUInteger) -> Option<&RenderPipelineColorAttachmentDescriptorRef> {
+// impl RenderPipelineColorAttachmentDescriptorArrayRef {
+//     pub fn object_at(&self, index: NSUInteger) -> Option<&RenderPipelineColorAttachmentDescriptorRef> {
+//         unsafe { msg_send![self, objectAtIndexedSubscript: index] }
+//     }
+
+//     pub fn set_object_at(
+//         &self,
+//         index: NSUInteger,
+//         attachment: Option<&RenderPipelineColorAttachmentDescriptorRef>,
+//     ) {
+//         unsafe {
+//             msg_send![self, setObject:attachment
+//                    atIndexedSubscript:index]
+//         }
+//     }
+// }
+
+
+impl std::ops::Index<NSUInteger> for RenderPipelineColorAttachmentDescriptorArrayRef {
+    type Output = RenderPipelineColorAttachmentDescriptor;
+
+    fn index(&self, index: NSUInteger) -> &Self::Output {
         unsafe { msg_send![self, objectAtIndexedSubscript: index] }
     }
+}
 
-    pub fn set_object_at(
-        &self,
-        index: NSUInteger,
-        attachment: Option<&RenderPipelineColorAttachmentDescriptorRef>,
-    ) {
-        unsafe {
-            msg_send![self, setObject:attachment
-                   atIndexedSubscript:index]
-        }
+impl std::ops::IndexMut<NSUInteger> for RenderPipelineColorAttachmentDescriptorArrayRef {
+    fn index_mut(&mut self, index: NSUInteger) -> &mut Self::Output {
+        unsafe { msg_send![self, objectAtIndexedSubscript: index] }
     }
-}
+}
\ No newline at end of file
diff --git a/src/renderpass.rs b/src/renderpass.rs
index 2c0f8e33..cd34f695 100644
--- a/src/renderpass.rs
+++ b/src/renderpass.rs
@@ -231,20 +231,39 @@ foreign_obj_type! {
     pub struct RenderPassColorAttachmentDescriptorArrayRef;
 }
 
-impl RenderPassColorAttachmentDescriptorArrayRef {
-    pub fn object_at(&self, index: usize) -> Option<&RenderPassColorAttachmentDescriptorRef> {
+
+// impl RenderPassColorAttachmentDescriptorArrayRef {
+//     // #[deprecated(
+//     //     since = "0.17.3",
+//     //     note = "Use Index trait methods instead"
+//     // )]
+//     pub fn object_at(&self, index: NSUInteger) -> Option<&RenderPassColorAttachmentDescriptorRef> {
+//         unsafe { msg_send![self, objectAtIndexedSubscript: index] }
+//     }
+
+//     pub fn set_object_at(
+//         &self,
+//         index: usize,
+//         attachment: Option<&RenderPassColorAttachmentDescriptorRef>,
+//     ) {
+//         unsafe {
+//             msg_send![self, setObject:attachment
+//                      atIndexedSubscript:index]
+//         }
+//     }
+// }
+
+impl std::ops::Index<NSUInteger> for RenderPassColorAttachmentDescriptorArrayRef {
+    type Output = RenderPassColorAttachmentDescriptorRef;
+
+    fn index(&self, index: NSUInteger) -> &Self::Output {
         unsafe { msg_send![self, objectAtIndexedSubscript: index] }
     }
+}
 
-    pub fn set_object_at(
-        &self,
-        index: usize,
-        attachment: Option<&RenderPassColorAttachmentDescriptorRef>,
-    ) {
-        unsafe {
-            msg_send![self, setObject:attachment
-                     atIndexedSubscript:index]
-        }
+impl std::ops::IndexMut<NSUInteger> for RenderPassColorAttachmentDescriptorArrayRef {
+    fn index_mut(&mut self, index: NSUInteger) -> &mut Self::Output {
+        unsafe { msg_send![self, objectAtIndexedSubscript: index] }
     }
 }
 
diff --git a/src/vertexdescriptor.rs b/src/vertexdescriptor.rs
index 610c9c81..32f88854 100644
--- a/src/vertexdescriptor.rs
+++ b/src/vertexdescriptor.rs
@@ -125,16 +125,17 @@ foreign_obj_type! {
     pub struct VertexBufferLayoutDescriptorArrayRef;
 }
 
-impl VertexBufferLayoutDescriptorArrayRef {
-    pub fn object_at(&self, index: NSUInteger) -> Option<&VertexBufferLayoutDescriptorRef> {
+impl std::ops::Index<NSUInteger> for VertexBufferLayoutDescriptorArrayRef {
+    type Output = VertexBufferLayoutDescriptor;
+
+    fn index(&self, index: NSUInteger) -> &Self::Output {
         unsafe { msg_send![self, objectAtIndexedSubscript: index] }
     }
+}
 
-    pub fn set_object_at(&self, index: NSUInteger, layout: Option<&VertexBufferLayoutDescriptorRef>) {
-        unsafe {
-            msg_send![self, setObject:layout
-                   atIndexedSubscript:index]
-        }
+impl std::ops::IndexMut<NSUInteger> for VertexBufferLayoutDescriptorArrayRef {
+    fn index_mut(&mut self, index: NSUInteger) -> &mut Self::Output {
+        unsafe { msg_send![self, objectAtIndexedSubscript: index] }
     }
 }