如何在iphone中重绘基于UIBezierpath的textview文本内容 [英] How to redraw the UIBezierpath based textview text contentsize in iphone

问题描述

我在uiview中使用UIBezierpath绘制消息气泡。我在bezier路径中渲染textview。我的问题是当我在textview中输入文本时我想要消息气泡大小动态增加但我不能这样做。如何解决问题。

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.

推荐答案

您可以调整UIBezier路径相对于您的UITextview帧大小，如下所示：

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);

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