Invalid context error on iOS 7 when adding a UIPickerView inside a UIActionSheet?

Question

I have an UIPickerView inside an UIActionSheet and have done that in a way suggested by many others here at SO:

Add UIPickerView & a Button in Action sheet - How?

how to add UIPickerView in UIActionSheet

The solutions have worked fine until now when testing my app on iOS 7. It still works but I got a lot of "invalid context 0x0" warnings during runtime in Xcode.

The errors are coming with a nice message too:

CGContextSetFillColorWithColor: invalid context 0x0. This is a serious error. This application, or a library it uses, is using an invalid context and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update.

Could it be that Apple finally want to stop this kind of solution or is it something we can work around or fix?

Answer 1

As the comments above point out, the UIActionSheet is not designed to be subclassed or take other views.

More info here at Apple:

https://developer.apple.com/library/ios/documentation/uikit/reference/UIActionSheet_Class/Reference/Reference.html#//apple_ref/doc/uid/TP40006801-CH3-DontLinkElementID_2

One approach is to look closer at the DateCell sample code and change that to use an UIPickerView instead:

https://developer.apple.com/library/ios/samplecode/DateCell/Introduction/Intro.html#//apple_ref/doc/uid/DTS40008866-Intro-DontLinkElementID_2