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:

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//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)];


—————————————–猥琐的分界线—————————————–

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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

—————————————–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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