Did anybody else notice the sweet wobble image code that David snuck into the BT 3.0 core? I've been doing a lot of tinkering with the interactive quiz plugin and realized this block of code works great as feedback for incorrect answers. Read on if you want your quiz to wobble like the one in this video - https://www.dropbox.com/s/o0xv1r9hub83n08/wobbleVid.mov It's really easy actually - first add the line [self wobbleImage]; to the -(void)answerClick method in BT_screen_quiz.m. ( Picture for reference - https://www.dropbox.com/s/no1du677g5wxz45/Screen%20Shot%202013-12-10%20at%2011.19.55%20PM.png ) Next and final step - add this big block of code after the -(void)answerClick method (that means make sure it is OUTSIDE of any curly brackets) //wobbleImage... -(void)wobbleImage{ [BT_debugger showIt:self theMessage:@"wobbleImage"]; //animate the image... #define RADIANS(degrees) ((degrees * M_PI) / 180.0) //You can mess around with these numbers to adjust the wobble CGAffineTransform leftWobble = CGAffineTransformRotate(CGAffineTransformIdentity, RADIANS(-2.0)); CGAffineTransform rightWobble = CGAffineTransformRotate(CGAffineTransformIdentity, RADIANS(2.0)); answerButtonBox.transform = leftWobble; [UIView beginAnimations:@"wobble" context:nil]; [UIView setAnimationRepeatAutoreverses:YES]; [UIView setAnimationRepeatCount:1]; [UIView setAnimationDuration:0.14]; [UIView setAnimationDelegate:self]; [UIView setAnimationDidStopSelector:@selector(wobbleEnded)]; answerButtonBox.transform = rightWobble; answerButtonBox.transform = leftWobble; [UIView commitAnimations]; } //wobbleEnded... -(void)wobbleEnded{ [BT_debugger showIt:self theMessage:@"wobbleEnded"]; answerButtonBox.transform = CGAffineTransformIdentity; } picture for reference - https://www.dropbox.com/s/3ri8pvhsy3tl7uv/Screen%20Shot%202013-12-10%20at%2011.22.34%20PM.png that's it..just thought it was a cool little trick worth sharing. Let me know if there's any issues

I'll try that. Slick little idea! Cheers! -- Smug

Nice! Thanks

Great! Absentia, have you found any bugs that need to be addressed on the quiz plugin? I'm going to manage this one going forward.

Slick!

@Chris - yeah, a couple..I'm heading out for some Christmas shopping right now but I'll follow up on it tonight

k cool

Agreed, great share/mod, thanks. It was a nice snippet he dropped in there to show you how easy it is to use CoreGraphics in your code. BT is full of nuggets like this if you explore the code. You can use this code in a 2.0 project as well if you want - the only thing you'll need to do is #import <CoreGraphics/CoreGraphics.h> into the .h of the class you want to use Core Graphics in. CG tricks are nice, cheap quick way to spice up a stale Company Logos.....

This has now been added to the interactive quiz plugin.