Subviews of NSRect not affected by NSAffineTransform - objective-c

Question

When applying an NSAffineTransform rotate and translate to an NSRect, none of the sub views are affected by the transform. I've included the code below.
- (void)drawRect:(NSRect)dirtyRect
{
NSAffineTransform * transform = [NSAffineTransform transform];
[transform translateXBy:13.0 yBy:3.0];
[transform rotateByDegrees:-45];
[transform translateXBy:-13.0 yBy:3.0];
[transform concat];
NSImageView *imageViewWatchPointer;
NSRect watchPointer = NSMakeRect(0, 0, 134, 49);
imageViewWatchPointer = [[NSImageView alloc] initWithFrame:watchPointer];
[imageViewWatchPointer setImageScaling:NSScaleNone];
[imageViewWatchPointer setImage:[NSImage imageNamed:#"mastery_watch_pointer"]];
[self addSubview:imageViewWatchPointer];
[[NSColor blueColor] set];
NSRectFill(watchPointer);
}

Answer 1

You're not applying transform to anything. You're creating it and then throwing it away. In any case, you never add subviews in drawRect:. drawRect: is for custom-drawing the current view, not for managing the view hierarchy. The way you've done this, you're adding a new NSImageView every time the main view is redrawn.
I recommend going back to the Cocoa Drawing Guide to understand how Cocoa drawing works.
Looking at your code, I don't believe you need drawRect: at all. You just want to add a subview, probably in awakeFromNib or initWithFrame:. I assume you want the view rotated. The easiest way to do that is to give it a backing layer (setWantsLayer:), and then set the affineTransform on the layer.
Alternately, in drawRect:, you could rotate the context and just draw the image itself (without using an NSImageView). See the Cocoa Drawing Guide for details on how to do custom drawing.