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PONSScrollView sometimes has a black bar instead of scroller
 

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  1. PONSScrollView sometimes has a black bar instead of scroller
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    <p>In my document based OS X app, I have an empty NSScrollView in the xib, with "show vertical scroller" set. At run time I generate a view with buttons for navigation, which I set as the document view for the NSScrollView. Most of the time, this works well, but about 25% of the time, seemingly at random (or at least I can't reproduce any particular condition yet!), instead of a scroller on the side, I get a black bar where the scroller should be. If I resize the window, the black bar disappears, the scroller appears and works fine. </p> <p>The result is that if I open six or seven blank documents, one after the other, about 3 of them will not have immediately functioning scrollviews. </p> <p>Here is the code that creates the view with the navigation buttons, and adds it as the NSScrollview's documentView. </p> <p>YMScrollDocView is a subclass of NSView that sets isFlipped to YES. navScrollView is the outlet to the scrollview in xib. </p> <pre><code> float allHeight = 0.f; // Consider starting from the top //float xOffset = 2.f; // Offset addjustments float spacing = 4.f; // Spacing float buttonCellHeight = 40.f; YMScrollDocView *navView = [[YMScrollDocView alloc]init]; //1 NSButton *overviewButton = [[NSButton alloc]initWithFrame:NSMakeRect(0, allHeight, self.navScrollView.bounds.size.width, buttonCellHeight)]; [overviewButton setTitle:@"Overview"]; [overviewButton setButtonType:NSMomentaryLight]; [overviewButton setBordered:NO]; [[overviewButton cell]setBackgroundColor:[self colorWithHexColorString:@"30BDF8"]]; [overviewButton setBezelStyle:NSRegularSquareBezelStyle]; [overviewButton setButtonType:NSCellIsBordered]; [overviewButton setTarget:self]; [overviewButton setAction:@selector(goToOverview)]; [overviewButton setRefusesFirstResponder:YES]; [navView addSubview:overviewButton]; allHeight += buttonCellHeight; allHeight += spacing; //2 NSButton *curriculumButton = [[NSButton alloc]initWithFrame:NSMakeRect(0, allHeight, self.navScrollView.bounds.size.width, buttonCellHeight)]; [curriculumButton setTitle:@"Curriculum"]; [curriculumButton setButtonType:NSMomentaryLight]; [curriculumButton setBordered:NO]; [[curriculumButton cell]setBackgroundColor:[self colorWithHexColorString:@"36FBF8"]]; [curriculumButton setBezelStyle:NSRegularSquareBezelStyle]; [curriculumButton setButtonType:NSCellIsBordered]; [curriculumButton setTarget:self]; [curriculumButton setAction:@selector(goToCurriculum)]; [curriculumButton setRefusesFirstResponder:YES]; [navView addSubview:curriculumButton]; allHeight += buttonCellHeight; allHeight += spacing; </code></pre> <p>(I add more buttons with repetitive code here, then finish with the following code.)</p> <pre><code>[navView setFrame:NSMakeRect(1, 1, self.navScrollView.bounds.size.width, allHeight)]; [[self navScrollView]setDocumentView:navView]; </code></pre>
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    1. USrmaddy
    1. USSteven Hovater
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    1. COI think you should let your embedded view be whatever size it wants to be (don't size it to the size of the scollview). The scrollview will worry about the rest.
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      1. UStrojanfoe
    2. COI switched that out, giving the embedded view a set width, but I'm still getting the same behavior.
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      1. PONSScrollView sometimes has a black bar instead of scroller
      1. USSteven Hovater
 

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