带有不同NSMutableParagraphStyle的Nsattributedstring

Question

我有一个带有多个段落的属性字符串。
我已经将FirstLineHeadIndent = 2.12.
现在我想在属性字符串中给第一个段落FirstLineHeadIndent=0， 并给第二个段落FirstLineHeadIndent=2。

如果我像下面这样设置属性：

 NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
        paragraphStyle.lineSpacing =Line_space;
        paragraphStyle.firstLineHeadIndent =2;
        paragraphStyle.headIndent =margin_space;
        paragraphStyle.tailIndent =-margin_space;
        paragraphStyle.paragraphSpacing=paragraph_space;

        NSDictionary *ats = @{
                              NSFontAttributeName : [UIFont fontWithName:self.bookView.defaultFontFamily size:self.bookView.defaultFontSize],
                              NSParagraphStyleAttributeName : paragraphStyle,
                              };

它将为段落和标题留出一些空间。

请看以下图片以获取更多帮助：

- ios developer

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你是如何将段落样式设置到你的 NSAttributedString 中的？ - Larme

@Larme 我已经通过NSMutableParagraphStyle设置了段落样式。但是它会影响所有段落。我想要为第一和第二段设置不同的样式。例如，第一段有2个行间距，第二段有4个行间距。 - ios developer

你能展示所有的代码吗？ - Larme

NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init]; paragraphStyle.firstLineHeadIndent = 2; paragraphStyle.paragraphSpacing = paragraph_space;NSDictionary *ats = @{ NSFontAttributeName : [UIFont fontWithName:self.bookView.defaultFontFamily size:self.bookView.defaultFontSize], NSParagraphStyleAttributeName : paragraphStyle, }; - ios developer

你需要使用两个段落样式，分别应用于不同的范围。你这样做了吗？ - Larme

Answer 1

因此，解决方案是使用2个段落样式。
您的NSString由\n分隔，表示两个段落之间的分隔符。

NSMutableParagraphStyle *firstParagraphStyle = [[NSMutableParagraphStyle alloc] init];
[firstParagraphStyle setFirstLineHeadIndent:0];
//Do the rest of the settings

NSMutableParagraphStyle *secondParagraphStyle = [[NSMutableParagraphStyle alloc] init];
[secondParagraphStyle setFirstLineHeadIndent:2];
//Do the rest of the settings

//You may use the same paragraphStyle, changing just the firstLineHeadIndent, and set the attributes, but for a clearer explanation, I used 2 paragraph styles
NSRange range = [[yourAttributedString string] rangeOfString:@"\n"];

[yourAttributedString addAttribute:NSParagraphStyleAttributeName value: firstParagraphStyle range:NSMakeRange(0, range.location)]; //The range is from the start to the \n

[yourAttributedString addAttribute:NSParagraphStyleAttributeName value: secondParagraphStyle range:NSMakeRange(range.location, [[yourAttributedString string] length]-range.location)]; //The range is from the start of \n to the end

- Larme