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iOS7中Cell高度 Label高度自适应

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?- (float)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
 
    NSString *str = [_dataArray objectAtIndex:indexPath.row];
    UIFont *tfont = [UIFont systemFontOfSize:14.0];
    NSDictionary * dic = [NSDictionary dictionaryWithObjectsAndKeys:tfont,NSFontAttributeName,nil];
    //   ios 7
    CGSize sizeText = [str boundingRectWithSize:CGSizeMake(320, 1000) options:NSStringDrawingUsesLineFragmentOrigin attributes:dic context:nil].size;
    //   ios 6
    CGSize sizeText1 = [str sizeWithFont:[UIFont systemFontOfSize:16.0f] constrainedToSize:CGSizeMake(320, 1000) lineBreakMode:NSLineBreakByCharWrapping];
    return sizeText1.height+50;    
 
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