iOS 富文本

NSString *text = @"哈哈哈哈\n哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈\n哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈\n哈哈哈哈哈哈哈哈哈哈";
NSMutableAttributedString *attStr = [[NSMutableAttributedString alloc]initWithString:text];

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  
NSDictionary *dic = @{
          NSForegroundColorAttributeName : [UIColor blackColor],
          NSFontAttributeName : kFont(18),
          NSParagraphStyleAttributeName : npgStyle,
          NSUnderlineStyleAttributeName : [NSNumber numberWithInteger:NSUnderlineStyleNone]
};
[attStr setAttributes:dic range:NSMakeRange(0, text.length)];

UILabel *label = [UILabel new];
label.numberOfLines = 0;
[self.view addSubview:label];
label.attributedText = attStr;