Label订制NSMutableParagraphStyle ／NSParagraphStyle

typedef NS_ENUM(NSInteger, NSLineBreakMode) {/* What to do with long lines */  NSLineBreakByWordWrapping = 0, /* Wrap at word boundaries, default */  NSLineBreakByCharWrapping,/* Wrap at character boundaries */  NSLineBreakByClipping,/* Simply clip */剪掉后面显示不了的部分  NSLineBreakByTruncatingHead,/* Truncate at head of line: "...wxyz" */头部分的内容以……方式省略  NSLineBreakByTruncatingTail,/* Truncate at tail of line: "abcd..." */结尾部分的内容以……方式省略  NSLineBreakByTruncatingMiddle/* Truncate middle of line:  "ab...yz" */中间部分的内容以……方式省略} NS_ENUM_AVAILABLE_IOS(6_0);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 左到右的书写方向  NSWritingDirectionRightToLeft   =  1// Right to left writing direction 右到左的书写方向} NS_ENUM_AVAILABLE_IOS(6_0); //   NSParagraphStyleAttributeName 段落的风格（设置首行，行间距，对齐方式什么的）看自己需要什么属性，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;//整体缩进(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/*   NSFontAttributeName 字体大小   NSParagraphStyleAttributeName 段落的风格（设置首行，行间距，对齐方式什么的）   NSKernAttributeName 字间距   */  NSDictionary *attributes = @{                 NSFontAttributeName:[UIFont systemFontOfSize:15],                 NSParagraphStyleAttributeName:paragraphStyle,                 NSKernAttributeName:@(10),                                                 };  textView.attributedText = [[NSAttributedString alloc] initWithString:textView.text attributes:attributes];