iOS-NSMutableParagraphStyle段落风格

apple API:

NS_CLASS_AVAILABLE(10_0, 6_0) @interface NSMutableParagraphStyle : NSParagraphStyle

@property(NS_NONATOMIC_IOSONLY) CGFloat lineSpacing;
@property(NS_NONATOMIC_IOSONLY) CGFloat paragraphSpacing;
@property(NS_NONATOMIC_IOSONLY) NSTextAlignment alignment;
@property(NS_NONATOMIC_IOSONLY) CGFloat firstLineHeadIndent;
@property(NS_NONATOMIC_IOSONLY) CGFloat headIndent;
@property(NS_NONATOMIC_IOSONLY) CGFloat tailIndent;
@property(NS_NONATOMIC_IOSONLY) NSLineBreakMode lineBreakMode;
@property(NS_NONATOMIC_IOSONLY) CGFloat minimumLineHeight;
@property(NS_NONATOMIC_IOSONLY) CGFloat maximumLineHeight;
@property(NS_NONATOMIC_IOSONLY) NSWritingDirection baseWritingDirection;
@property(NS_NONATOMIC_IOSONLY) CGFloat lineHeightMultiple;
@property(NS_NONATOMIC_IOSONLY) CGFloat paragraphSpacingBefore;
@property(NS_NONATOMIC_IOSONLY) float hyphenationFactor;
@property(null_resettable, copy, NS_NONATOMIC_IOSONLY) NSArray<NSTextTab *> *tabStops NS_AVAILABLE(10_0, 7_0);
@property(NS_NONATOMIC_IOSONLY) CGFloat defaultTabInterval NS_AVAILABLE(10_0, 7_0);
@property(NS_NONATOMIC_IOSONLY) BOOL allowsDefaultTighteningForTruncation NS_AVAILABLE(10_11, 9_0);

属性简单介绍:

//   NSParagraphStyleAttributeName 段落的风格（设置首行。行间距。对齐方式什么的）看自己须要什么属性，写什么
        NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
        paragraphStyle.lineSpacing = 10;// 字体的行间距
        paragraphStyle.firstLineHeadIndent = 20.0f;//首行缩进
        paragraphStyle.alignment = NSTextAlignmentJustified;//（两端对齐的）文本对齐方式：（左，中，右，两端对齐，自然）
        paragraphStyle.lineBreakMode = NSLineBreakByTruncatingTail;//结尾部分的内容以……方式省略 ( "...wxyz" ,"abcd..." ,"ab...yz")
        paragraphStyle.headIndent = 20;//总体缩进(首行除外)
        paragraphStyle.tailIndent = 20;//
        paragraphStyle.minimumLineHeight = 10;//最低行高
        paragraphStyle.maximumLineHeight = 20;//最大行高
        paragraphStyle.paragraphSpacing = 15;//段与段之间的间距
        paragraphStyle.paragraphSpacingBefore = 22.0f;//段首行空白空间/* Distance between the bottom of the previous paragraph (or the end of its paragraphSpacing, if any) and the top of this paragraph. */
        paragraphStyle.baseWritingDirection = NSWritingDirectionLeftToRight;//从左到右的书写方向（一共??三种）
        paragraphStyle.lineHeightMultiple = 15;/* Natural line height is multiplied by this factor (if positive) before being constrained by minimum and maximum line height. */
        paragraphStyle.hyphenationFactor = 1;//连字属性 在iOS。唯一支持的值分别为0和1