//行間距        84行
@property (NS_NONATOMIC_IOSONLY) CGFloat lineSpacing;

1: 父類

繼承于: NSParagraphStyle

2: 屬性

//這一段的底部和下一段的頂部之間的距離(或下一段的"頁眉", 如果有的話);  類似于頁腳;
@property (NS_NONATOMIC_IOSONLY) CGFloat paragraphSpacing;

//段落的位置樣式
@property (NS_NONATOMIC_IOSONLY) NSTextAlignment alignment;

typedef NS_ENUM(NSInteger, NSTextAlignment) {
        NSTextAlignmentLeft      = 0,//居左
        NSTextAlignmentCenter    = 1,//居中
        NSTextAlignmentRight     = 2,//居右
        NSTextAlignmentJustified = 3,//兩端對(duì)齊
        NSTextAlignmentNatural   = 4 //默認(rèn)對(duì)齊方式
};

//首行縮進(jìn)距離
@property (NS_NONATOMIC_IOSONLY) CGFloat firstLineHeadIndent;

//左側(cè)縮進(jìn)距離
@property (NS_NONATOMIC_IOSONLY) CGFloat headIndent;

//
@property (NS_NONATOMIC_IOSONLY) CGFloat tailIndent;

//換行模式
@property (NS_NONATOMIC_IOSONLY) NSLineBreakMode lineBreakMode;

typedef NS_ENUM(NSInteger, NSLineBreakMode) {
    NSLineBreakByWordWrapping = 0,  //按照單詞來換行
    NSLineBreakByCharWrapping,      //按照字符來換行  
    NSLineBreakByClipping,          //按照單詞來換行, 直接剪切(不是按照字符切割, 可能會(huì)切割半個(gè)字符)
    NSLineBreakByTruncatingHead,    //單行: 開頭是省略號(hào); 多行: 最后一行的開頭是省略號(hào)
    NSLineBreakByTruncatingTail,    //單行: 結(jié)尾是省略號(hào); 多行: 最后一行的結(jié)尾是省略號(hào)
    NSLineBreakByTruncatingMiddle   //單行:中間是省略號(hào); 多行: 最后一行的中間是省略號(hào)
} NS_ENUM_AVAILABLE(10_0, 6_0);

//最小行高
@property (NS_NONATOMIC_IOSONLY) CGFloat minimumLineHeight;

//最大行高
@property (NS_NONATOMIC_IOSONLY) CGFloat maximumLineHeight;

//書寫方向
@property (NS_NONATOMIC_IOSONLY) NSWritingDirection baseWritingDirection;

typedef NS_ENUM(NSInteger, NSWritingDirection) {
    NSWritingDirectionNatural       = -1,  //默認(rèn)書寫方向(和從左向右一樣)
    NSWritingDirectionLeftToRight   =  0,  //從左向右
    NSWritingDirectionRightToLeft   =  1   //從右向左  
} NS_ENUM_AVAILABLE_IOS(6_0);

@property (NS_NONATOMIC_IOSONLY) CGFloat lineHeightMultiple;

//前一段的底部(或前一段的"頁腳", 如果有的話)和這段頂部之間的距離;  類似于頁眉;
@property (NS_NONATOMIC_IOSONLY) CGFloat paragraphSpacingBefore;

@property (NS_NONATOMIC_IOSONLY) float hyphenationFactor;

@property (null_resettable, copy, NS_NONATOMIC_IOSONLY) NSArray<NSTextTab *> *tabStops;

@property (NS_NONATOMIC_IOSONLY) CGFloat defaultTabInterval;

@property (NS_NONATOMIC_IOSONLY) BOOL allowsDefaultTighteningForTruncation;

3:方法

//
- (void)addTabStop:(NSTextTab *)anObject;

- (void)removeTabStop:(NSTextTab *)anObject;

- (void)setParagraphStyle:(NSParagraphStyle *)obj;