NSTableView with custom clip view

CustomClipView.m

- (id)initWithFrame:(NSRect)frame {
	self = [super initWithFrame:frame];
	if (!self) return nil;

	self.layer = [CAScrollLayer layer];
	self.wantsLayer = YES;
	self.layerContentsRedrawPolicy = NSViewLayerContentsRedrawNever;

	return self;
}

CustomScrollView.m

- (id)initWithFrame:(NSRect)frameRect {
	self = [super initWithFrame:frameRect];
	if (self == nil) return nil;

	[self swapClipView];

	return self;
}

- (void)awakeFromNib {
	[super awakeFromNib];

	if (![self.contentView isKindOfClass:CustomClipView.class] ) {
		[self swapClipView];
	}
}

- (void)swapClipView {
	self.wantsLayer = YES;
	id documentView = self.documentView;
	CustomClipView *clipView = [[CustomClipView alloc] initWithFrame:self.contentView.frame];
	self.contentView = clipView;
	self.documentView = documentView;
}