ios – 在UITextView中获取CGRect文本,以便用CALayer突出显示

我试图在UITextView中绘制透明的CALayer,以突出显示搜索中匹配的文本. @H_696_5@ @H_696_5@我已经找到了正确的方法来做到这一点,但仍然没有找到正确的坐标.我需要找到文本容器的来源.现在,我得到textView的原点,并通过它来抵消图层的原点：

@H_696_5@

NSRange match = [[[self textView]text]rangeOfString:@"preDict the future"];
NSRange glyphRange = [manager glyphRangeForCharacterRange:match actualCharacterRange:NULL];

CGRect textRect = [manager boundingRectForGlyphRange:glyphRangE intextContainer:[[self textView]textContainer]];

CGPoint textViewOrigin = self.textView.frame.origin;
textRect.origin.x += (textViewOrigin.x / 2);
textRect.origin.y += (textViewOrigin.y / 2);


CALayer* roundRect = [CALayer layer];
[roundRect setFrame:textRect];
[roundRect setBounds:textRect];

[roundRect setCornerRadius:5.0f];
[roundRect setBACkgroundColor:[[UIColor blueColor]CGColor]];
[roundRect setOpacity:0.2f];
[roundRect setBorderColor:[[UIColor blackColor]CGColor]];
[roundRect setBorderWidth:3.0f];
[roundRect setShadowColor:[[UIColor blackColor]CGColor]];
[roundRect setShadowOffset:CGSizeMake(20.0f,20.0f)];
[roundRect setShadowOpacity:1.0f];
[roundRect setShadowRadius:10.0f];

[[[self textView]layer]addSublayer:roundRect];

@H_696_5@如果我移动文本字段,或者如果我不将偏移量除以2,则得到以下结果：

@H_696_5@我想知道我是否在正确的轨道上,以及如何找到NSTextContainer对象的起源.