Table view cells showing actual data only after scrolling once - ios

Question

NSArray *sectionArray;
int sectionCount=0;
NSDictionary *orderedData;
NSString *checkInStr, *checkOutStr;
NSString *govtTaxes, *enhancementTotal, *grandTotal;
- (void)viewDidLoad {
[super viewDidLoad];
[self setupTable];
[self.bookingsTableView reloadData];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
}
-(void)viewDidDisappear:(BOOL)animated {
if(doesSendNotification){
NSLog(#"summary view disappeared");
[[NSNotificationCenter defaultCenter] postNotificationName:#"SummaryViewDismissedNotification" object:self];
}
}
-(void)viewWillAppear:(BOOL)animated {
[self.bookingsTableView reloadData];
}
-(void)setupTable {
self.bookingsTableView.rowHeight = UITableViewAutomaticDimension;
self.bookingsTableView.estimatedRowHeight = 50.0;
sectionArray = [[SummaryModel sharedInstance] getTableSections:self.s_sendEnhancementServerDict];
orderedData = [[SummaryModel sharedInstance] getOrderedData:self.s_sendEnhancementServerDict];
[self.bookingsTableView reloadData];
}
#pragma mark- UITableview delegate and datasource methods
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
if(section==0){
return 3;
} else if (section>0 && section<(sectionCount-1)){
int rows=(int)[[orderedData objectForKey:(NSString*)[sectionArray objectAtIndex:section]] count];
return rows;
} else {
return 4;
}
}
-(NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {
return (NSString*)[sectionArray objectAtIndex:section];
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
NSString *cellIdentifier;
UITableViewCell *cell;
// UITableView *table = (UITableView*)[self.view viewWithTag:11];
if (indexPath.section==0 && indexPath.row>=0 && indexPath.row<=2) {
cellIdentifier =#"SplitCell";
cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier forIndexPath:indexPath];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
}
UILabel *l1 = (UILabel*)[cell viewWithTag:1];
UILabel *l2 = (UILabel*)[cell viewWithTag:2];
if(indexPath.row==0){
l1.attributedText = [self getStyledString1:#"Hotel Name"];
l2.attributedText = [self getStyledString:self.s_propertyName];
} else if(indexPath.row==1){
l1.attributedText = [self getStyledString1:#"Arrival Date:"];
l2.attributedText = [self getStyledString:checkInStr];
} else if(indexPath.row==2){
l1.attributedText = [self getStyledString1:#"Departure Date:"];
l2.attributedText = [self getStyledString:checkOutStr];
}
} else if (indexPath.section>0 && indexPath.section<(sectionCount-1)) {
// for(int i=0;i<5;i++){
cellIdentifier=#"VerticalLabelCell";
cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier forIndexPath:indexPath];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
}
UILabel *l3 = (UILabel*)[cell viewWithTag:3];
UILabel *l4 = (UILabel*)[cell viewWithTag:4];
l3.layer.backgroundColor = GOLDEN_COLOR.CGColor;
NSArray *roomTypeArray = [orderedData objectForKey:(NSString*)[sectionArray objectAtIndex:indexPath.section]];
NSDictionary *roomD = [roomTypeArray objectAtIndex:indexPath.row];
NSString *header = [roomD objectForKey:#"room_type_name"];
NSAttributedString *sH = [[NSAttributedString alloc] initWithString:[NSString stringWithFormat:#" %#",header] attributes:#{NSFontAttributeName:ARIAL_FONT_BOLD}];
l3.attributedText = sH;
int roomCount = [(NSNumber*)[roomD objectForKey:#"room_units"] intValue];
NSMutableAttributedString *labelText = [[NSMutableAttributedString alloc] init];
for(int i=0;i<roomCount;i++){
NSString *roomNo = [NSString stringWithFormat:#"\n Room # %d\n",i+1];
NSAttributedString *s = [[NSAttributedString alloc] initWithString:roomNo attributes:#{NSFontAttributeName:ARIAL_FONT_BOLD, NSUnderlineStyleAttributeName:#(NSUnderlineStyleSingle)}];
[labelText appendAttributedString:s];
NSString *adults = [NSString stringWithFormat:#" Adults: %# \t\t Max. Adults: %# \n",[roomD objectForKey:#"max_adults"],[roomD objectForKey:#"max_adults"]];
NSAttributedString *s1 = [[NSAttributedString alloc] initWithString:adults attributes:#{NSFontAttributeName:ARIAL_FONT_BOLD}];
[labelText appendAttributedString:s1];
NSArray *enhanc = [(NSArray*)[roomD objectForKey:#"room_features"] objectAtIndex:i];
for(int i=0;i<[enhanc count];i++){
[labelText appendAttributedString:[self getStyledString2:[NSString stringWithFormat:#" %#\n", [enhanc objectAtIndex:i]]]];
}
l4.attributedText = labelText;
}
} else if(indexPath.section==(sectionCount-1)){
cellIdentifier =#"SplitCell";
cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier forIndexPath:indexPath];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
}
UILabel *l1 = (UILabel*)[cell viewWithTag:1];
UILabel *l2 = (UILabel*)[cell viewWithTag:2];
if(indexPath.row==0){
l1.attributedText = [self getStyledString1:#"Room Charges:"];
l2.attributedText = [self getStyledString:[NSString stringWithFormat:#"£ %#", self.s_priceOfRooms]];
}else if(indexPath.row==1){
l1.attributedText = [self getStyledString1:#"Government Taxes:"];
l2.attributedText = [self getStyledString:[NSString stringWithFormat:#"£ %#", govtTaxes]];
}else if(indexPath.row==2){
l1.attributedText = [self getStyledString1:#"Enhancement Total:"];
l2.attributedText = [self getStyledString:[NSString stringWithFormat:#"£ %#", enhancementTotal]];
}else if(indexPath.row==3){
l1.attributedText = [self getStyledString1:#"Total Charges"];
l2.attributedText = [self getStyledString:[NSString stringWithFormat:#"£ %#", grandTotal]];
}
}
return cell;
}
-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
sectionCount = (int)[sectionArray count];
return sectionCount;
}
-(void)tableView:(UITableView *)tableView willDisplayHeaderView:(UIView *)view forSection:(NSInteger)section {
view.tintColor = GOLDEN_COLOR;
}
-(NSAttributedString*)getStyledString:(NSString*)input {
NSAttributedString *str = [[NSAttributedString alloc] initWithString:input attributes:#{NSForegroundColorAttributeName:GOLDEN_COLOR, NSFontAttributeName:ARIAL_FONT}];
return str;
}
-(NSAttributedString*)getStyledString1:(NSString*)input {
NSAttributedString *str = [[NSAttributedString alloc] initWithString:input attributes:#{NSFontAttributeName:ARIAL_FONT_BOLD}];
return str;
}
-(NSAttributedString*)getStyledString2:(NSString*)input {
NSAttributedString *str = [[NSAttributedString alloc] initWithString:input attributes:#{NSFontAttributeName:ARIAL_FONT}];
return str;
}
I have made a ViewController and added a table view in it. Some data is populated in cells and then displayed.
When I run it, initially I don't see any data in my cells. But when the tableview is scrolled cells start showing the actual data. I don't understand what could be the reason. Any pointers please???
I want to dynamically resize my cells as data can be of random size. Data shows only after scrolling once.

Answer 1

This problem is related to using UITableViewAutomaticDimension and has been reported at other places as well. So this line of code, solved my problem:
-(void)viewDidAppear:(BOOL)animated {
[self.tableView reloadData];
}
This just reloads all the table sections and rows before displaying. So user does not experience blank rows. Refer: http://www.appcoda.com/self-sizing-cells/

Answer 2

You need to use reloadData in the main thread (viewDidLoad). You need to use
dispatch_async like the code below :
dispatch_async(dispatch_get_main_queue(), ^{
[self.mytable reloadData];
}

Answer 3

In setupTable, check sectionArray and orderedData to make sure they're not empty. Add an assertion in setupTable, e.g.,
sectionArray = [[SummaryModel sharedInstance] getTableSections:self.s_sendEnhancementServerDict];
orderedData = [[SummaryModel sharedInstance] getOrderedData:self.s_sendEnhancementServerDict];
NSAssert([sectionArray count] && [orderedData count], #"No data!"); // add this line
[self.bookingsTableView reloadData];

Answer 4

Swift 5+
IOS 13
Xcode 11.2.1 +
Amazing Answer
override func viewDidAppear(_ animated: Bool) {
// self.tablev.frame.origin.y = vnavigation.frame.maxY + 5
// tablevheight = self.tablev.frame.size.height
self.bgview.backgroundColor = UIColor.init(patternImage: UIImage(named: "chat_bg.png")!)
self.registerForKeyboardNotifications()
UIView.performWithoutAnimation {
tablev.beginUpdates()
tablev.endUpdates()
}
}