label在cell中 自适应

- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
if (self ) {

UILabel *tempContent = [[UILabel alloc]initWithFrame:CGRectMake(self.titleLabel.frame.origin.x, CGRectGetMaxY(self.titleLabel.frame),BOUNDS.size.width-self.titleLabel.frame.origin.x-15, 30)];
tempContent.font = [UIFont systemFontOfSize:14.0f];
tempContent.textAlignment = NSTextAlignmentLeft;
tempContent.textColor = CLColor(102, 102, 102);
tempContent.numberOfLines = 0;
[self.contentView addSubview:tempContent];
self.contentLabel = tempContent;

}
return self;
}

- (void)setCellValueWith:(NSDictionary *)param {
self.contentLabel.frame = CGRectMake(self.titleLabel.frame.origin.x, CGRectGetMaxY(self.titleLabel.frame),BOUNDS.size.width-self.titleLabel.frame.origin.x-15, 0);
[self.contentLabel sizeToFit];//让内容自适应
}

//得到内容的自适应高度
-(CGFloat)contentHeightWithSize:(CGFloat)size width:(CGFloat)width string:(NSString *)string{
//第一个参数：是进行自适应的尺寸  第二个参数：布局格式 第三个参数：字符串的属性列表  第四个忽略
CGRect rect = [string boundingRectWithSize:CGSizeMake(width, 0) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:size]} context:nil];

return rect.size.height;

}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSDictionary *dic = [_dataSource objectAtIndex:indexPath.row];

CGFloat contentH = [self contentHeightWithSize:13.0 width:200 string:[dic objectForKey:@"topic"]];

return 60+contentH;

}