How to expand and collapse NSSplitView subviews with animation?

Question

Is it possible to animate the collapsing and expanding of NSSplitView subviews? (I am aware of the availability of alternative classes, but would prefer using NSSplitView ov

Answer 1

Here's a simpler method:

http://www.cocoabuilder.com/archive/cocoa/304317-animating-nssplitpane-position.html

(Link above dead, new link here.)

Which says create a category on NSSplitView as follows, and then animate with

[[splitView animator] setSplitPosition:pos];

Works for me.

Category:

@implementation NSSplitView (Animation)

+ (id)defaultAnimationForKey:(NSString *)key
{
    if ([key isEqualToString:@"splitPosition"])
    {
        CAAnimation* anim = [CABasicAnimation animation];
        anim.duration = 0.3;
        return anim;
    }
    else
    {
        return [super defaultAnimationForKey:key];
    }
}

- (void)setSplitPosition:(CGFloat)position
{
    [self setPosition:position ofDividerAtIndex:0];
}

- (CGFloat)splitPosition
{
    NSRect frame = [[[self subviews] objectAtIndex:0] frame];

    if([self isVertical])
        return NSMaxX(frame);
    else
        return NSMaxY(frame);
}

@end