如何在boundingRectWithSize中指定NSLineBreakMode？

本文介绍了如何在boundingRectWithSize中指定NSLineBreakMode？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

[text boundingRectWithSize：BOLIVIASize选项：NSStringDrawingUsesLineFragmentOrigin属性：@ {NSFontAttributeName：FONT} context：nil];

这是

- （CGSize）sizeWithFont：（UIFont *）font constrainedToSize：（CGSize）size lineBreakMode：（NSLineBreakMode）lineBreakMode

但是，如何在boundingRectWithSize上指定lineBreakMode参数？

解决方案

使用 NSParagraphStyleAttributeName & NSParagraphStyle ：

NSMutableParagraphStyle * paragraph = [[NSMutableParagraphStyle alloc] init] ; paragraph.lineBreakMode = NSLineBreakByWordWrapping; //例如。 CGSize size = [label.text boundingRectWithSize：constrainedSize选项：NSStringDrawingUsesLineFragmentOrigin属性：@ {NSFontAttributeName：label.font，NSParagraphStyleAttributeName：paragraph} context：nil] .size;

[text boundingRectWithSize:BOLIVIASize options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:FONT} context:nil];

That is the new replacement for

- (CGSize) sizeWithFont:(UIFont *)font constrainedToSize:(CGSize)size lineBreakMode:(NSLineBreakMode) lineBreakMode

However, how do I specify the lineBreakMode parameter on boundingRectWithSize?

解决方案

use NSParagraphStyleAttributeName & NSParagraphStyle:

NSMutableParagraphStyle *paragraph = [[NSMutableParagraphStyle alloc] init]; paragraph.lineBreakMode = NSLineBreakByWordWrapping; //e.g. CGSize size = [label.text boundingRectWithSize: constrainedSize options:NSStringDrawingUsesLineFragmentOrigin attributes: @{ NSFontAttributeName: label.font, NSParagraphStyleAttributeName: paragraph } context: nil].size;