大佬教程收集整理的这篇文章主要介绍了ios – boundingRectWithSize不复制UITextView,大佬教程大佬觉得挺不错的,现在分享给大家,也给大家做个参考。
问题是我得到的字体有点太大,文本的某些部分会被剪裁.
我的职责:
-(BOOL)updateTextViewFontSizeForText:(NSString*)text{ float fontSize = self.maximumFontSizeInPoints; self.font = [self.font fontWithSize:fontSize]; CGSize tallerSize ; CGSize StringSize ; do { if (fontSize <= self.minimumFontSizeInPoints) // it just won't fit return NO; fontSize -= 1.0; self.font = [self.font fontWithSize:fontSize]; NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init]; [paragraphStyle setLineBreakmode:NSLineBreakByWordWrapping]; NSDictionary *attributes = @{ NSFontAttributename: self.font,NSParagraphStyleAttributename : paragraphStyle }; tallerSize = CGSizeMake(self.frame.size.width,self.frame.size.height-16);// the 16 is given because uitextview adds some offset StringSize = [text boundingRectWithSize:CGSizeMake(self.contentSize.width,CGFLOAT_MAX) options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading attributes:attributes context:nil].size; }while(StringSize.height >= tallerSize.height); if ([self.ontextChangDelegate respondsToSELEctor:@SELEctor(ontextChangDelegatE)]) { [self.ontextChangDelegate ontextChanged:text]; } return YES; }
问题是UITextView与boundingRectWithSize相比如何运行其换行符.您可以在此处阅读更多详细信息:https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/TextLayout/Concepts/CalcTextLayout.html
但你实际上可以计算出确切的大小! UITextView基本上有两个属性,您需要考虑这些属性才能获得正确的大小估计值.第一个是textContainer.lineFragmentPadding,第二个是textContainerInset.
首先,textContainer.lineFragmentPadding:您可能已经注意到您的大小调整通常总是偏离10px,这是因为系统默认值是5px.当您计算估计的大小时,您需要从您检查的大小中减去此值,并在获得最终值时将其重新添加.
二,textContainerInset.这是一个UIEdgeInset,您需要将其添加回最终计算值以匹配系统.
- (CGSizE)sizeThatFits:(CGSizE)size CGFloat lineFragmentPaddings = self.textContainer.lineFragmentPadding * 2; CGFloat horzPadding = self.textContainerInset.left + self.textContainerInset.right + lineFragmentPaddings; CGFloat vertPadding = self.textContainerInset.top + self.textContainerInset.bottom; size.width -= horzPadding; CGRect boundingRect = [attributedText boundingRectWithSize:size options:NSStringDrawingUsesLineFragmentOrigin context:nil]; size = boundingRect.size; // I found through debugging that adding 0.25 rounded // matches sizeThatFits: identically. Not sure why… size.width += horzPadding + 0.25; size.height += vertPadding + 0.25; size = CGSizeround(sizE); return size; }
注意,CGSizeRound只是我编写的一个自定义函数,它将CGSize的宽度和高度四舍五入到最接近的0.5.
为了进行比较,如果您创建第二个UITextView,并确保textContainer.lineFragmentPadding和textContainerInset相同,您应该看到几乎与最接近的0.5相同的值.
关于计算正确的pointSize的问题,这是一些伪代码:
CGFloat pointSize = 64; CGFloat minPointSize = 32; CGFloat decrementor = 4; CGFloat padding = self.textContainerInset.left + self.textContainerInset.right + lineFragmentPaddings; CGFloat actualWidth = self.maxTextViewSize.width - padding * 2; CGRect boundingRect = CGRectZero; BOOL isValidPointSize = NO; do { if (pointSize < minPointSizE) { pointSize = minPointSize; boundingRect.size.height = self.maxTextViewSize.height; isValidPointSize = YES; } else { NSDictionary *defaultAttributes = [self.customTextStorage defaultAttributesForPointSize:pointSize]; NSAttributedString *attrString = [[NSAttributedString alloc] initWithString:string attributes:defaultAttributes]; boundingRect = [attrString boundingRectWithSize:CGSizeMake(actualWidth,1024) options:NSStringDrawingUsesLineFragmentOrigin context:nil]; // is the height to big? if (boundingRect.size.height > self.maxTextViewSize.height) { // reduce the point size for next iteration of loop pointSize -= decrementor; } // passes height test else { isValidPointSize = YES; } } } while (!isValidPointSizE); return pointSize;
同样,以上是基于我的实现的伪代码(并不意味着只是替换你所拥有的).希望这可以帮助!
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