title: AutoLayout with Masnory get warning
body: <p>I add a button at top and a label below button in tableviewcell use autolayout with masnory, everything is work well but i get some message something like warning.</p>
  
  <p>Row height calculate</p>
  
  <pre><code>- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
      if (self.mycell == nil) {
          self.mycell = [[AutoLayoutTableViewCell alloc] init];
      }
      self.mycell.label.text = [self.data objectAtIndex:indexPath.row];
      [self.mycell setNeedsUpdateConstraints];
      [self.mycell updateConstraintsIfNeeded];
      self.mycell.bounds = CGRectMake(0.0f, 0.0f, CGRectGetWidth(tableView.bounds), CGRectGetHeight(self.mycell.bounds));
      [self.mycell setNeedsLayout];
      [self.mycell layoutIfNeeded];
      CGFloat height = [self.mycell.contentView systemLayoutSizeFittingSize:UILayoutFittingCompressedSize].height;
      height += 1;
      return height;
  }
  </code></pre>
  
  <p>Here is my constraints</p>
  
  <pre><code>    UIView *root = self.contentView;
  
      [self.btn mas_makeConstraints:^(MASConstraintMaker *make) {
          make.height.mas_equalTo(80);
          make.top.equalTo(root).offset(16);
          make.leading.top.equalTo(root).offset(16);
          make.trailing.equalTo(root).offset(-16);
      }];
  
      [self.label mas_makeConstraints:^(MASConstraintMaker *make) {
          make.top.equalTo(self.btn.mas_bottom).offset(10);
          make.leading.equalTo(root).offset(16);
          make.trailing.equalTo(root).offset(-16);
          make.bottom.equalTo(root).offset(-16);
      }];
  </code></pre>
  
  <p>And get warning message.</p>
  
  <pre><code>Probably at least one of the constraints in the following list is one you don't want. Try this: 
  (1) look at each constraint and try to figure out which you don't expect;
  (2) find the code that added the unwanted constraint or constraints and fix it. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints) 
  
  (
  "&lt;NSLayoutConstraint:0x7fdce2437210 UITableViewCellContentView:0x7fdce242a900.height == 44&gt;",
  "&lt;MASLayoutConstraint:0x7fdce243aa40 UIButton:0x7fdce2434620.height == 80&gt;",
  "&lt;MASLayoutConstraint:0x7fdce243b080 UIButton:0x7fdce2434620.top == UITableViewCellContentView:0x7fdce242a900.top + 16&gt;",
  "&lt;MASLayoutConstraint:0x7fdce243bcc0 UILabel:0x7fdce2427cc0.top == UIButton:0x7fdce2434620.bottom + 10&gt;",
  "&lt;MASLayoutConstraint:0x7fdce243c550 UILabel:0x7fdce2427cc0.bottom == UITableViewCellContentView:0x7fdce242a900.bottom - 16&gt;"
  )
  
  Will attempt to recover by breaking constraint 
  &lt;MASLayoutConstraint:0x7fdce243aa40 UIButton:0x7fdce2434620.height == 80&gt;
  </code></pre>