Question

I’m having the exact same problem as in this question:

Gray border when using NSBorderlessWindowMask

However, the accepted answer (as in the comments) of removing the window shadow doesn’t seem to work, at least on Lion.

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I’ve subclassed NSWindow, and created a borderless window in this manner:

-(id)initWithContentRect:(NSRect)contentRect styleMask:(NSUInteger)aStyle backing:(NSBackingStoreType)bufferingType defer:(BOOL)flag {

    self = [super initWithContentRect:contentRect 
                            styleMask:(NSBorderlessWindowMask | NSResizableWindowMask)
                              backing:bufferingType 
                                defer:flag];

    [self setMovableByWindowBackground:YES];
    [self setOpaque:NO];
    [self setBackgroundColor:[NSColor clearColor]];
    [self setHasShadow:YES];

    [self setLevel:NSMainMenuWindowLevel];
    return self;
}

Please note that this app will only be run on Lion (so NSResizableWindowMask doesn’t change the appearance). I tried disabling the shadow, and toggling numerous settings for my window but I can’t seem to remove this grey border:

Nowhere in my code do I add a border. I simply have a NSSplitView added in Interface Builder in a window. During runtime I add the colored view as a subview to the left pane of the split view, completely filling the bounds of the left split view.

Edit: This happens even using a simple NSView, not even a split view.

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TL;DR: Why does my NSView have a grey border around it?

Answer 1

ok got it. to remove the shadow simply add this to your NSWindow subclass:

- (BOOL)hasShadow {
    return NO;
}

and to remove the border you need to know that this border is coming from the view – not the window (just like you said it in your edit). So you have to disable the border for the view with this code:

[myview setBorderType:NSNoBorder];