About MacOS Development - NSParagraphStyle

• Introduction

• Usage method

• Calculate paragraph height

• Related attributes

• alignment - 对齐方式
  firstLineHeadIndent - 首行缩进
  headIndent -  缩进
  tailIndent -  尾部缩进
  lineBreakMode - 断行方式
  maximumLineHeight - 最大行高
  minimumLineHeight - 最低行高
  lineSpacing - 行距
  paragraphSpacing  -段距
  paragraphSpacingBefore - 段首空间
  baseWritingDirection - 句子方向
  lineHeightMultiple - 可变行高乘因数
  hyphenationFactor - 连字符属性

---

Introduction

NSParagraphStyleAttributeName is used to set NSAttributedString, similar to NSFontAttributeName.
The difference is: NSParagraphStyleAttributeName is to set the paragraph style, NSFontAttributeName is to set the font.

---

Usage method

- (void)drawRect:(NSRect)dirtyRect {
    [super drawRect:dirtyRect];

    NSMutableParagraphStyle *textStyle = [[NSMutableParagraphStyle alloc] init];
    [textStyle setAlignment:NSTextAlignmentCenter];
    [textStyle setLineBreakMode:NSLineBreakByTruncatingTail];    
    NSDictionary *attributes = @{NSFontAttributeName: [NSFont systemFontOfSize:18],
                                 NSForegroundColorAttributeName: [NSColor whiteColor],
                                 NSParagraphStyleAttributeName: textStyle};    
                                 float w = self.frame.size.width;    
                                 float h = self.frame.size.height;    
                                 float str_h = 20;

    NSAttributedString *attributedText4 = [[NSAttributedString alloc] initWithString:@"这是一个 string" attributes:attributes];
}

---

Calculate paragraph height

 - (void)countHeight{    NSString *originStr = @"ashdhsaksah 和就会撒大声地哈萨克的";

    NSMutableAttributedString *attriStr = [[NSMutableAttributedString alloc] initWithString:originStr];
    NSFont *descFont = [NSFont systemFontOfSize:16];

    NSMutableParagraphStyle *descStyle = [[NSMutableParagraphStyle alloc]init];
    [descStyle setLineSpacing:1];//行间距

    CGFloat destinW = 100;    CGSize descSize = [originStr boundingRectWithSize:CGSizeMake(destinW, MAXFLOAT)
                                                options:NSStringDrawingUsesLineFragmentOrigin
                                             attributes:@{NSFontAttributeName:descFont,
                                                          NSParagraphStyleAttributeName :descStyle}
                                                context:nil].size;

}

---

Related attributes

• NSMutableParagraphStyle and NSParagraphStyle includes the following attributes

alignment - 对齐方式
firstLineHeadIndent - 首行缩进
headIndent -  缩进
tailIndent -  尾部缩进
lineBreakMode - 断行方式
maximumLineHeight - 最大行高
minimumLineHeight - 最低行高
lineSpacing - 行距
paragraphSpacing  -段距
paragraphSpacingBefore - 段首空间
baseWritingDirection - 句子方向
lineHeightMultiple - 可变行高,乘因数。
hyphenationFactor - 连字符属性

(void)setParagraphStyle{
NSMutableParagraphStyle *paragraphStyle = [NSMutableParagraphStyle new];
paragraphStyle.lineSpacing = 20.;// 行间距
paragraphStyle.lineHeightMultiple = 1.5;// 行高倍数（1.5倍行高）
paragraphStyle.firstLineHeadIndent = 30.0f;//首行缩进
paragraphStyle.minimumLineHeight = 10;//最低行高
paragraphStyle.maximumLineHeight = 20;//最大行高(会影响字体)
paragraphStyle.alignment = NSTextAlignmentLeft;// 对齐方式
paragraphStyle.defaultTabInterval = 144;// 默认Tab 宽度
paragraphStyle.headIndent = 20;// 起始 x位置
paragraphStyle.tailIndent = 320;// 结束 x位置（不是右边间距，与inset 不一样）
paragraphStyle.paragraphSpacing = 44.;// 段落间距
paragraphStyle.paragraphSpacingBefore = 44.;// 段落头部空白(实测与上边的没差啊？)
paragraphStyle.lineBreakMode = NSLineBreakByWordWrapping;// 分割模式
/*
NSLineBreakByWordWrapping = 0,      // Wrap at word boundaries, default
NSLineBreakByCharWrapping,  // Wrap at character boundaries
NSLineBreakByClipping,  // Simply clip
NSLineBreakByTruncatingHead, // Truncate at head of line: “…wxyz”
NSLineBreakByTruncatingTail, // Truncate at tail of line: “abcd…”
NSLineBreakByTruncatingMiddle // Truncate middle of line:  “ab…yz”
*/
paragraphStyle.baseWritingDirection = NSWritingDirectionRightToLeft;// 段落方向
/*
NSWritingDirectionNatural       = -1,    // Determines direction using the Unicode Bidi Algorithm rules P2 and P3
NSWritingDirectionLeftToRight   =  0,    // Left to right writing direction
NSWritingDirectionRightToLeft   =  1
*/
}

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