Override Appearance Proxy For A Certain Uiviewcontroller

2013-01-26

OK, the case is that in your application take advantage of the appearance proxy (iOS 5) for presenting a custom UI for your app. In AppDelegate.m you have [sourcecode language=“objc”] - (void)customizeAppearance { … // UISegmentedControl UIImage *segmentSelected = [[UIImage imageNamed:@“segcontrol_sel”] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 16, 0, 16)]; UIImage *segmentUnselected = [[UIImage imageNamed:@“segcontrol_uns”] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 16, 0, 16)]; UIImage *segmentSelectedUnselected = [UIImage imageNamed:@“segcontrol_divider”]; UIImage *segUnselectedSelected = [UIImage imageNamed:@“segcontrol_divider”]; UIImage *segUnselectedUnselected = [UIImage imageNamed:@“segcontrol_divider”]; [[UISegmentedControl appearance] setBackgroundImage:segmentUnselected forState:UIControlStateNormal barMetrics:UIBarMetricsDefault]; [[UISegmentedControl appearance] setBackgroundImage:segmentSelected forState:UIControlStateSelected barMetrics:UIBarMetricsDefault]; [[UISegmentedControl appearance] setDividerImage:segmentSelectedUnselected forLeftSegmentState:UIControlStateSelected rightSegmentState:UIControlStateNormal barMetrics:UIBarMetricsDefault]; [[UISegmentedControl appearance] setDividerImage:segUnselectedSelected forLeftSegmentState:UIControlStateNormal rightSegmentState:UIControlStateSelected barMetrics:UIBarMetricsDefault]; [[UISegmentedControl appearance] setDividerImage:segUnselectedUnselected forLeftSegmentState:UIControlStateNormal rightSegmentState:UIControlStateNormal barMetrics:UIBarMetricsDefault]; } [/sourcecode] and everything is working fine until??? Until the moment that you decide that in a UiSegmentedControl in a specific UIViewController you want a different appearance. This is the time that you want to override the universal appearance proxy behaviour and make an exception. In order to achieve this you can use + (id)appearanceWhenContainedIn:(Class <UIAppearanceContainer>)ContainerClass, … NS_REQUIRES_NIL_TERMINATION;method like: [sourcecode language=“objc”] - (void)customizeAppearance { … // UISegmentedControl UIImage *segmentSelected = [[UIImage imageNamed:@“segcontrol_sel”] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 16, 0, 16)]; UIImage *segmentSelectedBig = [[UIImage imageNamed:@“segcontrol_sel_big”] resizableImageWithCapInsets:UIEdgeInsetsMake(10, 16, 10, 16)]; UIImage *segmentUnselected = [[UIImage imageNamed:@“segcontrol_uns”] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 16, 0, 16)]; UIImage *segmentUnselectedBig = [[UIImage imageNamed:@“segcontrol_uns_big”] resizableImageWithCapInsets:UIEdgeInsetsMake(10, 16, 10, 16)]; UIImage *segmentSelectedUnselected = [UIImage imageNamed:@“segcontrol_divider”]; UIImage *segmentSelectedUnselectedBig = [UIImage imageNamed:@“segcontrol_divider_big”]; UIImage *segUnselectedSelected = [UIImage imageNamed:@“segcontrol_divider”]; UIImage *segUnselectedSelectedBig = [UIImage imageNamed:@“segcontrol_divider_big”]; UIImage *segUnselectedUnselected = [UIImage imageNamed:@“segcontrol_divider”]; [[UISegmentedControl appearance] setBackgroundImage:segmentUnselected forState:UIControlStateNormal barMetrics:UIBarMetricsDefault]; [[UISegmentedControl appearance] setBackgroundImage:segmentSelected forState:UIControlStateSelected barMetrics:UIBarMetricsDefault]; [[UISegmentedControl appearance] setDividerImage:segmentSelectedUnselected forLeftSegmentState:UIControlStateSelected rightSegmentState:UIControlStateNormal barMetrics:UIBarMetricsDefault]; [[UISegmentedControl appearance] setDividerImage:segUnselectedSelected forLeftSegmentState:UIControlStateNormal rightSegmentState:UIControlStateSelected barMetrics:UIBarMetricsDefault]; [[UISegmentedControl appearance] setDividerImage:segUnselectedUnselected forLeftSegmentState:UIControlStateNormal rightSegmentState:UIControlStateNormal barMetrics:UIBarMetricsDefault]; [[UISegmentedControl appearance] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIColor colorWithRed:220.0/255.0 green:255.0/255.0 blue:255.0/255.0 alpha:1.0], UITextAttributeTextColor, [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:1.0], UITextAttributeTextShadowColor, [NSValue valueWithUIOffset:UIOffsetMake(0, -1)], UITextAttributeTextShadowOffset, [UIFont fontWithName:@“Avenir-Medium” size:0.0], UITextAttributeFont, nil] forState:UIControlStateNormal]; // override appearance proxy for PetDetailsViewController id bigSegmentedControlAppearance = [UISegmentedControl appearanceWhenContainedIn:[PetDetailsViewController class], nil]; [bigSegmentedControlAppearance setBackgroundImage:segmentSelectedBig forState:UIControlStateSelected barMetrics:UIBarMetricsDefault]; [bigSegmentedControlAppearance setBackgroundImage:segmentUnselectedBig forState:UIControlStateNormal barMetrics:UIBarMetricsDefault]; [bigSegmentedControlAppearance setDividerImage:segmentSelectedUnselectedBig forLeftSegmentState:UIControlStateSelected rightSegmentState:UIControlStateNormal barMetrics:UIBarMetricsDefault]; [bigSegmentedControlAppearance setDividerImage:segUnselectedSelectedBig forLeftSegmentState:UIControlStateNormal rightSegmentState:UIControlStateSelected barMetrics:UIBarMetricsDefault]; } [/sourcecode] At the beginning we define two versions for each image and then using appearanceWhenContainedIn method we define the appearence for of UISegmentedControl only for the specific UIViewController. Credits to Mr.Dave DeLong