NSMutableParagraphStyle ／NSParagraphStyle

<span style="color: rgb(112, 61, 170); font-family: Menlo; font-size: 18px;">NSMutableParagraphStyle －> </span><span style="color: rgb(112, 61, 170); font-family: Arial; font-size: 14px;"> </span><span style="color: rgb(112, 61, 170); font-family: Menlo; font-size: 18px;">NSParagraphStyle </span><span style="color: rgb(112, 61, 170); font-family: Menlo; font-size: 18px;">－> </span><span style="color: rgb(112, 61, 170); font-family: Arial; font-size: 14px;"> </span><span style="color: rgb(112, 61, 170); font-family: Menlo; font-size: 18px;">NSObject</span>

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 P3NSWritingDirectionLeftToRight   =  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];