富文本文档学习

1、minimumLineHeight

文字的最小高度  文字的高度

2、lineSpacing

leading

行距

3、paragraphSpacing段落的间距

4、headIndent 首缩进

5、tailIndent 尾缩进

6、firstLineHeadIndent第一行的首缩进

7、lineBreakMode行截断模式

typedef NS_ENUM(NSInteger, NSLineBreakMode) {

    NSLineBreakByWordWrapping = 0,     

    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"

}

8、baseWritingDirection基本的书写方向

typedef NS_ENUM(NSInteger, NSWritingDirection) {

    NSWritingDirectionNatural       = -1,   // Determines direction using the Unicode Bidi Algorithm rules P2 and P3

    NSWritingDirectionLeftToRight   =  0,   // Left to right writing direction

    NSWritingDirectionRightToLeft   =  1    // Right to left writing direction

} NS_ENUM_AVAILABLE_IOS

9、