Adrian Sluyters Adrian Sluyters - 1 month ago 15
Objective-C Question

NSSplitView Fixed Splitter on Window Resize?

I'm having a bit of difficulty getting a NSSplitView to behave itself.

What I have at the moment is:

navView <NSView>
contentView <NSView>

The problem I'm having is with the splitter shifting position when I resize the window.

In the split view delegate I've already got:

-(CGFloat)splitView:(NSSplitView *)splitView constrainMaxCoordinate:(CGFloat)proposedMaximumPosition ofSubviewAt:(NSInteger)dividerIndex{
return 200;

-(CGFloat)splitView:(NSSplitView *)splitView constrainMinCoordinate:(CGFloat)proposedMinimumPosition ofSubviewAt:(NSInteger)dividerIndex{
return 200;


Despite this the splitter still moved when I resize the window.

if I click ont he splitter, it snaps back to 200px as it should. How can I stop this from moving?

I've tried Autolayout, which is a bit of a nightmare to use, so I've literally disabled it and manually tried to do it with no joy..

Any ideas?

Answer Source

I've worked it out...

-(void)splitView:(NSSplitView *)sender resizeSubviewsWithOldSize:(NSSize)oldSize
    CGFloat dividerThickness = [sender dividerThickness];
    NSRect leftRect  = [[[sender subviews] objectAtIndex:0] frame];
    NSRect rightRect = [[[sender subviews] objectAtIndex:1] frame];
    NSRect newFrame  = [sender frame];

    leftRect.size.height = newFrame.size.height;
    leftRect.origin = NSMakePoint(0, 0);
    rightRect.size.width = newFrame.size.width - leftRect.size.width
- dividerThickness;
    rightRect.size.height = newFrame.size.height;
    rightRect.origin.x = leftRect.size.width + dividerThickness;

    [[[sender subviews] objectAtIndex:0] setFrame:leftRect];
    [[[sender subviews] objectAtIndex:1] setFrame:rightRect];