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POSubclass of UIPageControl refresh only after uiscrollview move, not before
 

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  1. POSubclass of UIPageControl refresh only after uiscrollview move, not before
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    <p>the problem I've met today is with my subclass of <code>UIPageControl</code>. When I initialize it, the frame (specifically the origin) and image of dots stays default, which is the problem, since I want it to change right after initialization. However, when I move with scrollView (as in "touch and move") after initialization, they (the dots) somehow jump to the right position with correct images.</p> <p>What could be the problem?</p> <p>Code:</p> <p>CustomPageControl.m</p> <pre><code>- (id) initWithFrame:(CGRect)frame { self = [super initWithFrame:frame]; activeImage = [UIImage imageNamed:@"doton.png"]; inactiveImage = [UIImage imageNamed:@"dotoff.png"]; return self; } - (void) updateDots { for (int i = 0; i &lt; [self.subviews count]; i++) { UIImageView *dot = [self.subviews objectAtIndex:i]; if (i == self.currentPage) dot.image = activeImage; else dot.image = inactiveImage; [dot setFrame:CGRectMake(i * 13.5, 1.5, 17, 17)]; } } - (void)setCurrentPage:(NSInteger)currentPage { [super setCurrentPage:currentPage]; [self updateDots]; } @end </code></pre> <p>ChoosingView.m - init part</p> <pre><code>scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 160, 300)]; [scrollView setBackgroundColor:[UIColor clearColor]]; [scrollView setDelaysContentTouches:NO]; [scrollView setCanCancelContentTouches:YES]; [scrollView setClipsToBounds:NO]; [scrollView setScrollEnabled:YES]; [scrollView setPagingEnabled:YES]; [scrollView setShowsHorizontalScrollIndicator:NO]; [scrollView setShowsVerticalScrollIndicator:NO]; pageControl = [[CustomPageControl alloc] initWithFrame:CGRectMake(200, 300, 80, 20)]; [pageControl setBackgroundColor:[UIColor clearColor]]; pageControl.numberOfPages = 6; [pageControl setCurrentPage:0]; </code></pre> <p>the last line is when I would expect the <code>UIPageControl</code> to refresh, however that does not happen.</p>
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    1. USDaniel
    1. USGyfis
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      1. POSubclass of UIPageControl refresh only after uiscrollview move, not before
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      1. VTUpMod
    1. COI think the problem has to do with timing of your requests: for example, not all subviews have been placed into `self.subviews` array. I would try to move the `[pageControl setCurrentPage:0]` call into your view controller's `viewWillAppear` and see what happens.
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      1. POSubclass of UIPageControl refresh only after uiscrollview move, not before
      1. USdasblinkenlight
    2. COWell, that helped, partially. Images are now correct, but the frames are still wrong, before first move. Thanks though !
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      1. POSubclass of UIPageControl refresh only after uiscrollview move, not before
      1. USGyfis
    3. CO@dasblinkenlight's suggestion probably applies to most of the problems you have... including the frames.
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      1. POSubclass of UIPageControl refresh only after uiscrollview move, not before
      1. USDustin
 

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