在iOS 7中NSLineBreakMode的等效字符串绘制方法是什么？ [英] What is the equivalent of NSLineBreakMode in iOS 7 attributed strings drawing methods?

问题描述

有一个方法

- (CGSize)drawInRect:(CGRect)rect withFont:(UIFont *)font lineBreakMode:(NSLineBreakMode)lineBreakMode alignment:(NSTextAlignment)alignment;

我现在必须为iOS 7替换。我得到了

which I must replace now for iOS 7. I get as far as

NSDictionary *attributes = @{NSFontAttributeName: font};
[self drawInRect:rect withAttributes:attributes];

但如何指定换行模式，如自动换行？我搜索了归因字符串绘制符号的文档，但没有提到换行模式。这是否自动总是自动换行？

but how to specify the line break mode like word wrap? I searched documentation of Attributed string drawing symbols but no mention of line break mode. Is this automartically always word-wrap?

推荐答案

您需要创建一个段落样式。

You need to create a paragraph style.

NSMutableParagraphStyle *style = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
[style setLineBreakMode:NSLineBreakByWordWrapping];

NSDictionary *attributes = @{NSFontAttributeName: font, NSParagraphStyleAttributeName: style};
[self drawInRect:rect withAttributes:attributes];

此处提供更多信息：
https://developer.apple.com/documentation/uikit/nsparagraphstyle?language=objc

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