sizeWithFont：constrainedToSize：不推荐使用lineBreakMode

问题描述

我有以下代码：

float height = [string sizeWithFont:[UIFont systemFontOfSize:kFontSize] constrainedToSize:CGSizeMake(widthOfTextView, 999999.0f) lineBreakMode:NSLineBreakByWordWrapping].height + verticalPadding;

但是，每当我运行我的应用程序并收到警告，告诉我这是不赞成的。我应该使用什么以及如何将其与当前代码一起使用？

However, whenever I run my application and get a warning telling me that this is deprecated. What should I use and how would I use it with my current code?

谢谢！

推荐答案

这被[string boundingRectWithSize：options：attributes：context]取代。 技巧是创建一个属性字典，其中包含您以前使用的字体和换行模式。在您的情况下，应该是：

This is replaced by [string boundingRectWithSize:options:attributes:context]. The "trick" is to create an attributes dictionary that contains the font and line-break mode you were previously using. In your case, that should be:

// Create a paragraph style with the desired line break mode
NSMutableParagraphStyle *paragraphStyle = [[[NSMutableParagraphStyle alloc] init] autorelease];
paragraphStyle.lineBreakMode = NSLineBreakByWordWrapping;

// Create the attributes dictionary with the font and paragraph style
NSDictionary *attributes = @{
                               NSFontAttributeName:detailTextFont,
                               NSParagraphStyleAttributeName:paragraphStyle
                           };

// Call boundingRectWithSize:options:attributes:context for the string
CGRect textRect = [string boundingRectWithSize:CGSizeMake(widthOfTextView, 999999.0f)
                                       options:NSStringDrawingUsesLineFragmentOrigin
                                    attributes:attributes
                                       context:nil];

float height = textRect.size.height;

如果您不使用段落样式，您将获得默认的NSLineBreakByWordWrapping。

If you leave off the paragraph style, you will get the default of NSLineBreakByWordWrapping.

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