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文字不在居中了。        //设置行间距为10     NSMutableParagraphStyle *warnParagraph = [[NSMutableParagraphStyle alloc] init];     NSMutableAttributedString *warnAttr = [[NSMutableAttributedString alloc] initWithString:tipsLabel.text];     [warnAttr addAttribute:NSParagraphStyleAttributeName value:warnParagraph range:NSMakeRange(0,tipsLabel.text.length)];     tipsLabel.attributedText = warnAttr;   代码。后来在这段代码后面再次设置       tipsLabel.textAlignment = NSTextAlignmentCenter;   文字就居中了。  原文链接：https://www.f2er.com/note/422757.html