UITableView stops scrolling - ios

Question

My TableView, which uses custom cells, sometimes 'stops' scrolling when I return from a DetailView.
I can push the view up a couple inches or so, and the lower cells do come into view, but the scrollview should be 4 or 5 windows in height.
The detail view is called through a segue. In addition to the back button, I also trigger a return with a swipe gesture. Either way it happens. - not all the time though.
Hope this is enough info. Does anyone have any ideas what I am screwing up?
Thanks!
Here's some code:
- (NSIndexPath *)tableView:(UITableView *)tableView willSelectRowAtIndexPath:(NSIndexPath *)indexPath{
int row = [indexPath row];
int sect = [indexPath section];
NSDictionary *shift = [globals.shifts objectAtIndex:sect];
NSLog(#"\nShift = %#", shift);
NSLog(#"\nEmployees = %#", [shift objectForKey:#"Employees"]);
NSArray *employees = [shift objectForKey:#"Employees"];
NSDictionary *employee = [employees objectAtIndex:row];
globals.badge = [employee objectForKey:#"Badge"];
globals.name = [employee objectForKey:#"Name"];
return indexPath;
}
- (void)receivedData:(NSData *)responseData {
NSError* error;
globals.report = [NSJSONSerialization
JSONObjectWithData:responseData
options:kNilOptions
error:&error];
globals.shifts = [globals.report objectForKey:#"shifts"];
[globals.ai removeFromSuperview];
[table reloadData];
self.title = [ [NSString alloc] initWithFormat:#"%# - %#",
[globals.clientNames objectAtIndex:globals.curClient],
[self.dateFormatter stringFromDate: globals.weekEnd]];
self.title = [ [NSString alloc] initWithFormat:#"%#",
[self.dateFormatter stringFromDate: globals.weekEnd]];
}
-(void) viewWillAppear:(BOOL)animated {
if( globals == nil || globals.report == nil )
{
appDelegate = (MSIAppDelegate *)[[UIApplication sharedApplication] delegate];
globals = [appDelegate globals];
[[self view] addSubview:globals.ai];
NSString *urlString = [[NSString alloc] initWithFormat:
#"http://www.msiwebtrax.com/Client/%#/WeeklyReport?id=%#&start=%#&end=%#", [globals.clientIDs objectAtIndex:globals.curClient], globals.userName, [globals.formatter stringFromDate: globals.weekEnd], [globals.formatter stringFromDate: [globals.weekEnd dateByAddingTimeInterval:(-7) * 24 * 60 * 60] ]];
NSURL *url = [NSURL URLWithString: urlString];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0 ), ^{
NSData* data = [NSData dataWithContentsOfURL:
url];
[self performSelectorOnMainThread:#selector(receivedData:)
withObject:data waitUntilDone:YES];
});
}
}
- (void)viewDidLoad
{
[super viewDidLoad];
UIScrollView *tempScrollView=(UIScrollView *)self.view;
NSLog(#"scroll view dimensions: %f, %f", tempScrollView.contentSize.height, tempScrollView.contentSize.width);
self.dateFormatter = [[NSDateFormatter alloc] init];
[self.dateFormatter setDateStyle:NSDateFormatterMediumStyle];
[self.dateFormatter setTimeStyle:NSDateFormatterNoStyle];
// Uncomment the following line to preserve selection between presentations.
self.clearsSelectionOnViewWillAppear = NO;
// Uncomment the following line to display an Edit button in the navigation bar for this view controller.
// self.navigationItem.rightBarButtonItem = self.editButtonItem;
}
Here's the number of sections/rows
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
int sections = [globals.shifts count];
return sections;
}
- (NSInteger) tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
NSDictionary* shift = [globals.shifts objectAtIndex:section];
int rowCount = [[shift objectForKey:#"Employees"] count];
return rowCount;
}
--
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
static NSString *CellIdentifier = #"EmployeeHoursCell";
EmployeeHoursCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if( cell == nil ) {
cell = [[EmployeeHoursCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
NSUInteger section = [indexPath section];
NSUInteger row = [indexPath row];
globals.employees = [[globals.shifts objectAtIndex:section] objectForKey:#"Employees"];
cell.Row.text = [[NSString alloc] initWithFormat:#"%3d", (row+1)];
cell.Id.text = [[globals.employees objectAtIndex:row] objectForKey:#"Badge"];
cell.Name.text = [[globals.employees objectAtIndex:row] objectForKey:#"Name"];
NSArray *days = [[globals.employees objectAtIndex:0] objectForKey:#"Days"];
cell.Hrs1.text = [[NSString alloc] initWithFormat:#"%#",[[days objectAtIndex:0] objectForKey:#"Rounded"] ];
cell.Hrs1.text = [[NSString alloc] initWithFormat:#"%.2f", [cell.Hrs1.text doubleValue]];
cell.Hrs2.text = [[NSString alloc] initWithFormat:#"%#",[[days objectAtIndex:1] objectForKey:#"Rounded"] ];
cell.Hrs2.text = [[NSString alloc] initWithFormat:#"%.2f", [cell.Hrs2.text doubleValue]];
cell.Hrs3.text = [[NSString alloc] initWithFormat:#"%#",[[days objectAtIndex:2] objectForKey:#"Rounded"] ];
cell.Hrs3.text = [[NSString alloc] initWithFormat:#"%.2f", [cell.Hrs3.text doubleValue]];
cell.Hrs4.text = [[NSString alloc] initWithFormat:#"%#",[[days objectAtIndex:3] objectForKey:#"Rounded"] ];
cell.Hrs4.text = [[NSString alloc] initWithFormat:#"%.2f", [cell.Hrs4.text doubleValue]];
cell.Hrs5.text = [[NSString alloc] initWithFormat:#"%#",[[days objectAtIndex:4] objectForKey:#"Rounded"] ];
cell.Hrs5.text = [[NSString alloc] initWithFormat:#"%.2f", [cell.Hrs5.text doubleValue]];
cell.Hrs6.text = [[NSString alloc] initWithFormat:#"%#",[[days objectAtIndex:5] objectForKey:#"Rounded"] ];
cell.Hrs6.text = [[NSString alloc] initWithFormat:#"%.2f", [cell.Hrs6.text doubleValue]];
cell.Hrs7.text = [[NSString alloc] initWithFormat:#"%#",[[days objectAtIndex:6] objectForKey:#"Rounded"] ];
cell.Hrs7.text = [[NSString alloc] initWithFormat:#"%.2f", [cell.Hrs7.text doubleValue]];
return cell;
}
Okay all - in the viewWillAppear method, I tried reloading the table, which didn't have any impact. But I then reset the contentSize to 0,0 before and it seems to work fine now, not entirely sure why - but I noticed the first time I come back from a detailview, the height is set to around 2000, the second time I return it is zero - at which point it works. So I set it to zero and reload.
Thanks Darren and all for the responses!