If I have a TextView with exclusion paths in a UITableViewCell, how can I calculate the cell's height for a given string?
可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试):
由 
翻译强力驱动
翻译强力驱动问题:
回答1:
I found a solution which I think might be of help to others. Since it does not require the creation of a new NSTextContainer, NSLayoutManager, and NSTextStorage object, which are already instantiated as part of the UITextView, I suspect it would be more efficient.
To calculate the size of a UITextView that is using exclusions paths and NSAttributedString, one can do the following:
// Assuming something like this... UIBezierPath * exclusionPath = [UIBezierPath bezierPathWithRect:someRect]; self.textView.textContainer.exclusionPaths = @[exclusionPath]; NSAttributedString * attributedString = ... self.textView.attributedString = attributedString; ... // Use text container, layout manager, and text storage associated with the text view. NSTextContainer * textContainer = self.textView.textContainer; NSLayoutManager * layoutManager = textContainer.layoutManager; NSTextStorage * textStorage = layoutManager.textStorage; // Limit the width or height. In this case, limiting the width to 280. textContainer.size = CGSizeMake(280.0, FLT_MAX); [textStorage setAttributedString:attributedString]; // Because the layout manager performs layout lazily, on demand, you must force it to lay out the text, even though you don’t need the glyph range returned by this function. [layoutManager glyphRangeForTextContainer:textContainer]; // Ask the layout manager for the height of the rectangle occupied by the laid-out text CGFloat height = [layoutManager usedRectForTextContainer:textContainer].size.height;回答2:
Actually you don't need to play with textContainer and layoutManager. This works for me.
UIBezierPath *exclusionPath = [UIBezierPath bezierPathWithRect:imageViewFrame]; UITextView *tempTextView = [[UITextView alloc] init]; [tempTextView setFont:font]; tempTextView.textContainer.exclusionPaths = @[exclusionPath]; [tempTextView.textStorage replaceCharactersInRange:NSMakeRange(0, [tempTextView.text length]) withString:text]; CGRect textViewFrame = [tempTextView frame]; textViewFrame.size.height = [tempTextView sizeThatFits:CGSizeMake(290, FLT_MAX)].height; return textViewFrame.size.height;