IOS 5 unrecognized selector send at appearance proxy for setBackgroundImage

问题

Like a lot of developers I am playing around with the new features of IOS 5.

I tried to use appearance proxy's for customizing my App. But at some methods I get an error.

This works:

[[UINavigationBar appearance] setBarStyle:UIBarStyleBlackTranslucent];
//and
[[UINavigationBar appearance] setTintColor:[UIColor greenColor]];

But when I try:

[[UINavigationBar appearance] setBackgroundImage:[UIImage imageNamed:@"toolbar_background.png"]];

I get an unrecognized selector error:

-[_UIAppearance setBackgroundImage:]: unrecognized selector sent to instance 0x153020
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[_UIAppearance setBackgroundImage:]: unrecognized selector sent to instance 0x153020'
*** First throw call stack:
(0x3107a8bf 0x3821f1e5 0x3107dacb 0x3107c945 0x30fd7680 0x2fe7 0x3304c7eb 0x330463bd 0x33014921 0x330143bf 0x33013d2d 0x33bffe13 0x3104e553 0x3104e4f5 0x3104d343 0x30fd04dd 0x30fd03a5 0x33045457 0x33042743 0x2f31 0x2ec8)
terminate called throwing an exception(gdb)

Any ideas ?

回答1:

The method has a different name, you're missing a part of it. Since iOS 5 is still under NDA, I won't cite or link the method name here, but you can look it up yourself:

Go to the iOS Dev Center.
Select iOS SDK GM Seed.
Select iOS Developer Library.
In the search field, start typing UINavigationBar.
Click on the UINavigationBar Class Reference link.
Read the documentation.

来源：https://stackoverflow.com/questions/7702438/ios-5-unrecognized-selector-send-at-appearance-proxy-for-setbackgroundimage

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