UITableView Dynamic Height not changing iOS - ios

Question

Drag and drop UITableViewHeader
You can look at an orange color UITextView.
I set the height constant of the tableview is zero.
After reloading the tableview total height of UITableView showing same as previous(as no UITextView showing)
-(void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
self.heightConstCommentBox.constant = 0;
[self configureTableviewFooter];
}
-(void)configureTableviewFooter{
//More button Configure
height = 50 +[self recusiveDescription:self.viewFooter] ;
// Assign new frame
self.viewFooter.frame = CGRectMake(self.viewFooter.frame.origin.x,
self.viewFooter.frame.origin.y,self.viewFooter.frame.size.width , height); // viewFooter is container view of tableFooterView
self.tableView.tableFooterView = self.viewFooter;
[self.tableView reloadData];
}
- (float )recusiveDescription:(UIView *)view
{
NSString *s = #"";
float height = 0;
NSArray *subviews = [view subviews];
if ([subviews count] == 0) return 0;
for (UIView *subView in subviews) {
height = height + subView.frame.size.height ;
[self recusiveDescription:subView];
}
return height;
}
After reloading the tableview , table view footer size not changing.

Answer 1

In method recusiveDescription:(UIView *)view you use the frame property of the subview. But for the autolayout it is not correct. To get future size of the view, call:
- (CGSize)systemLayoutSizeFittingSize:(CGSize)targetSize
withHorizontalFittingPriority:(UILayoutPriority)horizontalFittingPriority
verticalFittingPriority:(UILayoutPriority)verticalFittingPriority;
This method returns the optimal size for the view based on the provided constraint priorities.
Also I did not understand why do you call recusiveDescription in recusiveDescription: and do not use result value.

Answer 2

u can use following in case u used custom cell for table.
in following code replace postss[index.row].post with your label content and +230 is minimum height of your cell.
or u can say its height of other view other than label.
automatic dimension method will work only if u have 1 label or 1 textfield,1 textview.
and don't fix your label's height.
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
let heightOfRow = self.calculateHeight(inString: postss[indexPath.row].post)
return (heightOfRow + 230)
}
//custom function for calculate dynamic height
func calculateHeight(inString:String) -> CGFloat
{
let messageString = inString
let attributes : [NSAttributedString.Key : Any] = [NSAttributedString.Key.font : UIFont.systemFont(ofSize: 15.0)]
let attributedString : NSAttributedString = NSAttributedString(string: messageString, attributes: attributes)
let rect : CGRect = attributedString.boundingRect(with: CGSize(width: 370, height: CGFloat.greatestFiniteMagnitude), options: .usesLineFragmentOrigin, context: nil)
let requredSize:CGRect = rect
return requredSize.height
}