How to redraw the UIBezierpath based textview text contentsize in iphone

问题

I draw the message bubble using UIBezierpath in uiview. I render the textview inside the bezier path. My problem is when I enter the text in textview I want to message bubble size dynamically increase but I cannot do that. how can resolve the issue.

回答1:

You can resize the UIBezierpath relative to your UITextview frame size like this:

CGRect box = CGPathGetBoundingBox(bezierpath.CGPath)
CGFloat scaleX = textView.frame.size.width / box.frame.size.width;
CGFloat scaleY = textView.frame.size.height / box.frame.size.height;
CGAffineTransform transform = CGAffineTransformMakeScale(scaleX, scaleY);
CGPathRef intermediatePath = CGPathCreateCopyByTransformingPath(bezierpath.CGPath, &transform);
bezierPath.CGPath = intermediatePath;
CFRelease(intermediatePath);

Hope that help!

来源：https://stackoverflow.com/questions/13524022/how-to-redraw-the-uibezierpath-based-textview-text-contentsize-in-iphone