//换行模式
lineBreakMode.spec = kCTParagraphStyleSpecifierLineBreakMode;
lineBreakMode.value = &lineBreak;
lineBreakMode.valueSize = sizeof(CTLineBreakMode);
//行间距
CTParagraphStyleSetting LineSpacing;
CGFloat spacing = 4.0; //指定间距
LineSpacing.spec = kCTParagraphStyleSpecifierLineSpacingAdjustment;
LineSpacing.value = &spacing;
LineSpacing.valueSize = sizeof(CGFloat);
CTParagraphStyleSetting settings[] = {lineBreakMode,LineSpacing};
CTParagraphStyleRef paragraphStyle = CTParagraphStyleCreate(settings, 2); //第二个参数为settings的长度
[attributedString addAttribute:(NSString *)kCTParagraphStyleAttributeName
value:(id)paragraphStyle
range:NSMakeRange(0, attributedString.length)];
这并不是唯一的方法，还有另一种替代方案：
CATextLayer *textLayer = [CATextLayer layer];
textLayer.string = getAttributedString();
textLayer.frame = CGRectMake(0, CGRectGetMaxY(view.frame), 200, 200);
[self.view.layer addSublayer:textLayer];
CATextLayer可以直接支持NSAttributedString！
效果图：
