// 文字的最大尺寸
CGSize maxSize = CGSizeMake([[UIScreen mainScreen] bounds].size.width - 4 * LYTopicCellMargin, MAXFLOAT);
CGFloat textH = [self.text boundingRectWithSize:maxSize options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName : [UIFont systemFontOfSize:13]} context:nil].size.height;
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