Get UITableView's height - iphone

Question

I have created a UITableview with custom UITableViewCell.The UITableViewCell contains UILabels and I have calculated the height of each cell based on the cells height.But how can I get the tableview height?Because based on the tableView's height I need to calculate
the height of scrollView
I have created a UITableView like this when a button is clicked:
-(IBAction)btnClicked:(id)sender
{
self.tableView=[[UITableView alloc] initWithFrame:CGRectMake(0,150,327,[arr5 count]*205) style:UITableViewStylePlain];
self.tableView.delegate=self;
self.tableView.dataSource=self;
self.tableView.scrollEnabled = NO;
[self.view addSubview:self.tableView];
float fscrview = 150 + self.tableView.frame.size.height + 20;
testscroll.contentSize=CGSizeMake(320, fscrview);
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSString *city1 = city.text;
UIFont *font = [UIFont fontWithName:#"Helvetica" size:14.0];
CGSize constraintSize = CGSizeMake(280.0f, MAXFLOAT);
CGSize bounds = [city1 sizeWithFont:font constrainedToSize:constraintSize lineBreakMode:UILineBreakModeWordWrap];
//similarly calculated for all
return (CGFloat) cell.bounds.size.height + bounds.height+bounds1.height+bounds2.height+bounds3.height+bounds4.height+bounds5.height;
}
I am able to get tableViewCells height through this.How do I calculate/set the overall tableView's height after this?
And how to calculate ScrollView's height based on tableView's row/height?

Answer 1

Use contentSize.height property of UITableView.
I think you want to set the whole tableview with content size and then set the scrollview size related content of UITableView and for this use bellow code...
After add data or reloadData in UITableView just set bellow code..
yourTableView.frame = CGRectMake(yourTableView.frame.origin.x,yourTableView.frame.origin.y, yourTableView.frame.size.width, yourTableView.contentSize.height);
float ftbl = yourTableView.frame.origin.y + yourTableView.contentSize.height + 15;
yourScrollView.contentSize=CGSizeMake(320, ftbl);
UPDATE:
self.tableView=[[UITableView alloc] initWithFrame:CGRectMake(0,150,327,[arr5 count]*205)style:UITableViewStylePlain];
self.tableView.delegate=self;
self.tableView.dataSource=self;
[testscroll addSubview:self.tableView]; /// add this tableview in scrollview not in self.view
[self.tableView reloadData];
self.tableView.frame = CGRectMake(self.tableView.frame.origin.x, self.tableView.frame.origin.y, self.tableView.frame.size.width, self.tableView.contentSize.height);
float ftbl = self.tableView.frame.origin.y + self.tableView.contentSize.height + 15;
testscroll.contentSize=CGSizeMake(320, ftbl);

Answer 2

Very simplest way to get your UITableView height
- (CGFloat)tableViewHeight
{
[tblData layoutIfNeeded];
return [YOUR_TABLE_NAME contentSize].height;
}

Answer 3

on iOS 8+ this worked to get the table view Height
CGFloat tableViewHeight = tableView.bounds.size.height;

Answer 4

Try this: tableView.backgroundView.bounds.size.height Should work
Logic:
UITableView has a property, backgroundView which is "A table view’s background view is automatically resized to match the size of the table view."
backgroundView is a UIView which has the property bounds which is a CGRect that "defines the size and position of the view."
CGRect has a size property, size has a height property
QED

Answer 5

You also can use KVO to observer tableview's contentSize property and adjust what you need in other views.
Put it somewhere, e.g. in viewDidLoad:
[self.tableView addObserver:self forKeyPath:#"contentSize" options:NSKeyValueObservingOptionNew|NSKeyValueObservingOptionInitial context:nil];
Then implement observer:
- (void) observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSKeyValueChangeKey,id> *)change context:(void *)context {
if (object == self.tableView) {
self.scrollViewHeightConstraint.constant = self.tableView.contentSize.height;
}
else {
[super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
}
}