UILabel 自适应大小

NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStylealloc]init];

paragraphStyle.lineBreakMode = NSLineBreakByWordWrapping;

NSDictionary *attributes = @{NSFontAttributeName:[UIFontsystemFontOfSize:10], NSParagraphStyleAttributeName:paragraphStyle.copy};

CGSize labelSize = [_textLabel.textboundingRectWithSize:CGSizeMake(50,12) options:NSStringDrawingUsesLineFragmentOriginattributes:attributes context:nil].size;

labelSize.height = ceil(labelSize.height);

labelSize.width = ceil(labelSize.width);