UINavigationBar + UIAppearance: not possible to restore standard blurred look

Originator:futuretap
Number:rdar://16898794 Date Originated:13-May-2014 06:25 PM
Status:Open Resolved:
Product:iOS SDK Product Version:7.1
Classification:UI/Usability Reproducible:Always
 
I’ve defined a background image for all UINavigationBar’s using the appearance proxy:

	[[UINavigationBar appearance] setBackgroundImage:[UIImage imageNamed:@"myNavBar"] forBarMetrics:UIBarMetricsDefault];

Now I want to exclude specific navigation bars where I want to restore the standard blurred look:

	[[UINavigationBar appearanceWhenContainedIn:MyNavigationController.class, nil] setBackgroundImage:nil forBarMetrics:UIBarMetricsDefault];

This does not work. Instead of getting back the original look with the blurred background, I get a completely transparent navigation bar.

IMO, setting a nil backgroundImage should restore the original look. Should I actually want a clear background, I’d rather specify a clear UIImage.

Comments

Workaround

The case is actually a bit more complicated. My code is: 

[[UINavigationBar appearance] setBackgroundImage:[UIImage imageNamed:@"myNavBar"] forBarMetrics:UIBarMetricsDefault];
[[UINavigationBar appearance] setBackgroundImage:[UIImage imageNamed:@"myNavBarWithPrompt"] forBarMetrics:UIBarMetricsDefaultPrompt];
[[UINavigationBar appearanceWhenContainedIn:MyNavigationController.class, nil] setBackgroundImage:nil forBarMetrics:UIBarMetricsDefault];

in this case, the last line sets a clear background instead of the default background. If I also add 

[[UINavigationBar appearanceWhenContainedIn:MyNavigationController.class, nil] setBackgroundImage:nil forBarMetrics:UIBarMetricsDefaultPrompt];

it works and I get the blurred look in "MyNavigationController". So apparently, I have to override the image for all barMetrics, even though I don't actually need a prompted navigation bar for the excluded case.

By futuretap at May 13, 2014, 4:49 p.m. (reply...)

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