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POHow to commit a UIButton state change before starting other UIView animations?
 

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  1. POHow to commit a UIButton state change before starting other UIView animations?
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    <p>I have a UIButton which fires a target action causing one view to transition to another on touchupinside.</p> <p>When this happens the I also change the button's state to selected but the (different) background image for the selected state doesn't actually draw until the UIView transition is complete (or sometimes it also seems to transition with the UIView transition.)</p> <p>How can I force the button to redraw the new background image before starting the view transition?</p> <p>The code that runs on UIControlEventTouchUpInside:</p> <pre><code>RhSubTab *activeTab; for(RhSubTab *tab in self.tabViews.copy) { tab.selected = NO; [self.view bringSubviewToFront:tab]; if(tab.tag == type) activeTab = tab; } [self.view bringSubviewToFront:activeTab]; [activeTab setSelected:YES]; UIView *oldView; UIView *newView; for(UIView *view in self.contentViews.copy) { if([self.view.subviews containsObject:view]) { oldView = view; } if(view.tag == type) { newView = view; } } if(!oldView) [self.view addSubview:newView]; else [UIView transitionFromView:oldView toView:newView duration:0.5 options:(UIViewAnimationOptionTransitionCrossDissolve|UIViewAnimationCurveEaseInOut) completion:nil]; </code></pre> <p>And the custom (RhSubTab) button class:</p> <pre><code>- (id)initWithCoder:(NSCoder *)aDecoder { self = [super initWithCoder:aDecoder]; if(self) { [self setBackgroundImage:[[UIImage imageNamed:@"SubContentTabBg.png"] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 9, 0, 40)] forState:UIControlStateNormal]; [self setBackgroundImage:[[UIImage imageNamed:@"SubContentTabBg-selected.png"] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 9, 0, 40)] forState:UIControlStateSelected]; } return self; } </code></pre>
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