iOS Obj-C - UITableView data disappears when modal view dismissed - ios

Question

I have a uitableview inside of a view controller, and a button underneath of my uitableview. Tapping this button opens a modal view. I've created a "close" button inside my modal using the following code:
modalview.m
- (IBAction)closeButton:(id)sender {
[self dismissViewControllerAnimated:YES completion:nil];
}
However when I tap to dismiss my modal view, all of the data in my uitableview seems to disappear (the uitableview just goes white)? Any idea why this might be, and how can I fix it? Here is how my tableview data is loaded and structured (hope this helps):
ViewController.m
-(void)updateMessages {
self.tableView.dataSource = self;
NSMutableDictionary *viewParams = [NSMutableDictionary new];
[viewParams setValue:#"name" forKey:#"view_name"];
[DIOSView viewGet:viewParams success:^(AFHTTPRequestOperation *operation, id responseObject) {
self.messages = (NSMutableArray *)responseObject;
[self.tableView reloadData];
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(#"Failure: %#", [error localizedDescription]);
}];
}
- (void)viewDidLoad {
[super viewDidLoad];
[self updateMessages];
static NSString *ChatTableIdentifier = #"ChatTableViewCell";
static NSString *ChatTableIdentifier2 = #"SwapDetailTableViewCell";
UINib *nib = [UINib nibWithNibName: ChatTableIdentifier bundle:nil];
[self.tableView registerNib:nib forCellReuseIdentifier: ChatTableIdentifier];
UINib *nib2 = [UINib nibWithNibName: ChatTableIdentifier2 bundle:nil];
[self.tableView registerNib:nib2 forCellReuseIdentifier: ChatTableIdentifier2];
self.tableView.dataSource = self;
[self.tableView reloadData];
}
- (int)numberOfSectionsInTableView: (UITableView *)tableview
{
return 1;
}
- (int)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [self.messages count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSDictionary *data = self.messages[indexPath.row];
id swaptime = data[#"swaptime"];
if ([swaptime isKindOfClass:[NSString class]]) {
// There is a valid "swaptime" value
static NSString *ChatTableIdentifier2 = #"SwapDetailTableViewCell";
SwapDetailTableViewCell *cell = (SwapDetailTableViewCell *)[tableView dequeueReusableCellWithIdentifier:ChatTableIdentifier2 forIndexPath:indexPath];
NSString *time = data[#"swaptime"];
cell.startTime.text = time;
NSString *timeEnd = data[#"endswaptime"];
cell.endTime.text = timeEnd;
NSString *costofSwap = data[#"swapvalue"];
cell.swapValue.text = costofSwap;
NSString *fromUsername = data[#"first name"];
cell.fromUser.text = fromUsername;
NSString *pet = data[#"pet's name"];
cell.petsname.text = pet;
NSString *swapStatus = data[#"swapaccepted"];
if ([swapStatus isEqual: #"Yes"]) {
[cell.displayedBar setImage:[UIImage imageNamed:#"greenbar.png"]];
cell.swapTitle.text = #"Accepted!";}
else {
if ([swapStatus isEqual: #""]) {
[cell.displayedBar setImage:[UIImage imageNamed:#"orangecellbar.png"]];
cell.swapTitle.text = #"You have a Request!";}
if ([swapStatus isEqual: #"Requested"]) {
[cell.displayedBar setImage:[UIImage imageNamed:#"orangecellbar.png"]];
cell.swapTitle.text = #"You have a Request!";}
if ([swapStatus isEqual: #"Cancelled"]) {
[cell.displayedBar setImage:[UIImage imageNamed:#"blueecellbar.png"]];
cell.swapTitle.text = #"Cancelled!";}
if ([swapStatus isEqual: #"No"]) {
[cell.displayedBar setImage:[UIImage imageNamed:#"redbar.png"]];
cell.swapTitle.text = #"Declined!";
}
}
return cell;
} else {
static NSString *ChatTableIdentifier = #"ChatTableViewCell";
ChatTableViewCell *cell = (ChatTableViewCell *)[tableView dequeueReusableCellWithIdentifier:ChatTableIdentifier forIndexPath:indexPath];
NSString *userName = data[#"first name"];
cell.sendingUser.text = userName;
NSString *messageBody = data[#"body"];
cell.messageDisplayed.text = messageBody;
NSString *timeReceived = data[#"published at"];
cell.timeStamp.text = timeReceived;
NSString *userInfo = [self.userid objectForKey:#"first name"];
if ([cell.sendingUser.text isEqual: userInfo]) {
cell.messageDisplayed.textAlignment = NSTextAlignmentLeft;
cell.sendingUser.textAlignment = NSTextAlignmentLeft;
[cell.chatBubble setImage:[UIImage imageNamed:#"bubblegrey2.png"]];
} else {
cell.messageDisplayed.textAlignment = NSTextAlignmentRight;
cell.sendingUser.textAlignment = NSTextAlignmentRight;
[cell.chatBubble setImage:[UIImage imageNamed:#"bubbleorange2.png"]];
}
return cell;
}
}
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
[self.tableView setContentOffset:CGPointMake(0, CGFLOAT_MAX)];
}

Answer 1

The problem is probably in your viewDidAppear, try replace:
[self.tableView setContentOffset:CGPointMake(0, CGFLOAT_MAX)];
with:
[self.tableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:[self.messages count]-1 inSection:0] atScrollPosition:UITableViewScrollPositionBottom animated:YES];
or properly calculate the height, probably it's:
self.tableView.contentView.height