UIAttributedString自动换行问题
网上搜了大半天，如出一辙的结果如下：设置行间距和换行模式都是设置一个属性：kCTParagraphStyleAttributeName，这个属性里面又分为很多子
属性，其中就包括
kCTLineBreakByCharWrapping
kCTParagraphStyleSpecifierLineSpacingAdjustment
设置如下：
//段落
//line break
CTParagraphStyleSetting lineBreakMode;
CTLineBreakMode lineBreak = kCTLineBreakByCharWrapping; //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)];
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这并不是唯一的方法，还有另一种替代方案：
CATextLayer *textLayer = ;
textLayer.string = getAttributedString();
textLayer.frame = CGRectMake(0, CGRectGetMaxY(view.frame), 200, 200);
;
CATextLayer可以直接支持NSAttributedString！
-----------------------------------------猥琐的分界线-----------------------------------------
其实不用这么麻烦，一行代码搞定！哪怕是Button上的AttribledText，看好了别眨眼：
button.titleLabel.lineBreakMode = NSLineBreakByWordWrapping;
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