iOS: round framed UIbutton
You can manipulate the CALayer of your button to do this pretty easily.
// assuming you have a UIButton or more generally a UIView called buyButton
buyButton.layer.cornerRadius = 2;
buyButton.layer.borderWidth = 1;
buyButton.layer.borderColor = [UIColor blueColor].CGColor;
// (note - may prefer to use the tintColor of the control)
you can tweak each of those to get the color and border effect you want.
You will also have to add an import in any file you want to use CALayers
If you are a big fan of using storyboards for your UI design with iOS, you can set the corner radius (although unfortunately not the color) in the
user defined runtime attributes in storyboard as shown here: