// 先初始化一個段落樣式

NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];

// 調(diào)整行間距

[paragraphStyle setLineSpacing:3];
self.descLabel.attributedText =[[NSAttributedString alloc] initWithString: _model.desc                                   
attributes:@{NSFontAttributeName: 
[UIFont systemFontOfSize:11.f],                                                
NSForegroundColorAttributeName:[UIColor redColor],                                                NSParagraphStyleAttributeName:paragraphStyle}];