Fixes #205 Add blur feature for picker background

[nikola-mladenovic]

Added pickerBlurRadius property for setting the desired blur radius for picker background blur effect.

It works only if pickerBackgroundColor is nil and the device is iPhone (iPad isn't currently supported due to issue with grabbing the snapshot image from UIPopoverController frame).

@skywinder - if you agree I'd like to add an example to ActionSheetPickerTableViewController so it can be tried out easily?

[skywinder]

@nikola-mladenovic Yes, add please example to test and demonstrate it! Thank you! 👍

[nikola-mladenovic]

@skywinder - thanks, added one more static cell in ActionSheetPickerTableViewController which opens a picker with blur radius set to picker.pickerBlurRadius = @(10)

Please note that there's a storyboard change for this static cell, just in case you have some work going on on that particular storyboard on some other branch.

[nikola-mladenovic]

@skywinder - have you had a chance to look at this one? Any feedback perhaps? ☺️

[skywinder]

@nikola-mladenovic sorry for delay! Looks good! Can you also add a couple strings to readme about this feature, please?

[nikola-mladenovic]

No worries - yes, will add them and update the PR 😊

[tbaranes]

For your information, in #205 I was thinking about an option to have a blur instead of the black transparent overlay, above the picker, not in the picker. So, it shouldn't close this issue, but still, that a nice feature you have here!

[skywinder]

@nikola-mladenovic Thank you for the PR! 👍
If you can add some description to readme - it would be nice

Already in 2.1.0 🎉

[nikola-mladenovic]

Great news @skywinder - and yes, I'm going to try and add desc to readme by the end of this week! 😊

[nikola-mladenovic]

@tbaranes - I didn't get that from the desc in the issue; how about you create a new one for the that feature, and we'll create a new PR for that one?

[tbaranes]

Sounds good @nikola-mladenovic, do you mind to take care of this?

[masonk]

I can't build the example projects with the latest version of ASP 3.0

Undefined symbols for architecture x86_64:
"OBJC_CLASS$_CIContext", referenced from:
objc-class-ref in AbstractActionSheetPicker.o
"OBJC_CLASS$_CIFilter", referenced from:
objc-class-ref in AbstractActionSheetPicker.o
"OBJC_CLASS$_CIImage", referenced from:
objc-class-ref in AbstractActionSheetPicker.o
"_kCIInputImageKey", referenced from:
-[AbstractActionSheetPicker blurPickerBackground] in AbstractActionSheetPicker.o
"_kCIInputRadiusKey", referenced from:
-[AbstractActionSheetPicker blurPickerBackground] in AbstractActionSheetPicker.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Which could be related to this commit.

[skywinder]

@masonk I don't see any issues yet.
that's could be a problem with some archs setups. try to clean your build.

[masonk]

It's not that. I think it's related to the deployment target.

When I build your example projects, only the ActionSheetPicker-iOS-5-7 project produces this linker error, the others don't.