NSTextView rounded border / stroke in Cocoa

I am subclassing NSTextView and over-riding the drawRect method in order to draw an NSBezierPathWithRoundedRect around the textview, however - as it has rounded edges, they interfere with the text in the text view.

Is there any way to apply some kind of margin or padding all around the text input area of the NSTextView so that it is more inset, and away from the rounded edges? Or is a better approach to sit the NSTextView within an NSView and apply the rounded stroke to the NSView instead?

- (void)drawRect:(NSRect)dirtyRect {
// Drawing code here.
[super drawRect:dirtyRect];

NSRect rect = [self bounds];
NSRect newRect = NSMakeRect(rect.origin.x+2, rect.origin.y+2, rect.size开发者_如何学C.width-3, rect.size.height-3);

NSBezierPath *textViewSurround = [NSBezierPath bezierPathWithRoundedRect:newRect xRadius:10 yRadius:10];
[textViewSurround setLineWidth:2.0];
[[NSColor whiteColor] set];
[textViewSurround stroke];

}

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I think -setTextContainerInset: does what you need. Alternatively, you should not call super in your implementation of -drawRect: and draw the text container yourself.

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You could try setting margins on the paragraph style of the whole textView's string.

Or maybe put your textview inside a larger parent view with rounded corners and a border?