NSArray Values are Display after touche in screen in Tableview - iphone

Question

- (void)viewDidLoad {
detailView = [[UITableView alloc] initWithFrame:CGRectMake(0, 0, 330, 380) style:UITableViewStylePlain];
detailView.rowHeight = 55.0f;
detailView.dataSource =self;
detailView.delegate =self;
NSLog(#"finish0");
[self.view addSubview:detailView];
self.title = NSLocalizedString(#"Routes", nil);
self.detailArray = [[NSMutableArray alloc] init];
url = [NSString stringWithFormat:#"http://maps.googleapis.com/maps/api/directions/json?origin=%#&destination=%f,%f&sensor=false",start1,center.latitude,center.longitude];
NSURL *googleRequestURL=[NSURL URLWithString:url];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
NSData* data = [NSData dataWithContentsOfURL: googleRequestURL];
NSError* error;
NSMutableDictionary* parsedJson = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
NSArray *allkeys = [parsedJson allKeys];
for(int i = 0; i < allkeys.count; i++){
if([[allkeys objectAtIndex:i] isEqualToString:#"routes"]){
NSArray *arr = [parsedJson objectForKey:#"routes"];
NSDictionary *dic = [arr objectAtIndex:0];
legs = [dic objectForKey:#"legs"];
for(int i = 0; i < legs.count; i++){
NSArray *stepsArr = [[legs objectAtIndex:i] objectForKey:#"steps"];
for (int i = 0; i < stepsArr.count; i++) {
[self.detailArray addObject:[[stepsArr objectAtIndex:i] objectForKey:#"html_instructions"] ];
string = [self.detailArray componentsJoinedByString:#","];
NSLog(#"string%#",string);
[self stringByStrippingHTML];
self.detail=[string componentsSeparatedByString:#","];
[self.detail retain];
[detailView reloadData];
}}}}
});
-(NSInteger) numberOfSectionsInTableView:(UITableView *)tableView{
return 1;
}
-(NSInteger) tableView:(UITableView *)table numberOfRowsInSection:(NSInteger)section{
return [detail count];
NSLog(#"table2");
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSLog(#"table4");
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
cell.selectionStyle = UITableViewCellSelectionStyleNone;
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(5.0f, 0.0f, 300.0f, 60.0f)];
label.text=[NSString stringWithFormat:#"%#",[detail objectAtIndex:indexPath.row]];
label.numberOfLines = 3;
label.font = [UIFont fontWithName:#"Helvetica" size:(12.0)];
label.lineBreakMode = UILineBreakModeWordWrap;
label.textAlignment = UITextAlignmentLeft;
[cell.contentView addSubview:label];
[label release];
return cell;
}
-(NSString *) stringByStrippingHTML {
NSRange r;
while ((r = [string rangeOfString:#"<[^>]+>" options:NSRegularExpressionSearch]).location != NSNotFound)
string = [string stringByReplacingCharactersInRange:r withString:#""];
return string;
}
In The coding the values of self.detail(array) display after touches the screen in TableView.i need to display the values immediately when i enter the TableView. please any one help if you know. and tell me why the values of NSArray display only after touch or scroll the tableview.

Answer 1

try this
[self.detailView performSelectorOnMainThread:#selector(reloadData) withObject:nil waitUntilDone:NO];
instead of [detailView reloadData];

Answer 2

You need to reload the table view after you have finished downloading the data and populating your array with the result. That is
url = [NSString stringWithFormat:#"http://maps.googleapis.com/maps/api/directions/json?origin=%#&destination=%f,%f&sensor=false",start1,center.latitude,center.longitude];
NSURL *googleRequestURL=[NSURL URLWithString:url];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
NSData* data = [NSData dataWithContentsOfURL: googleRequestURL];
NSError* error;
NSMutableDictionary* parsedJson = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
NSArray *allkeys = [parsedJson allKeys];
for(int i = 0; i < allkeys.count; i++){
if([[allkeys objectAtIndex:i] isEqualToString:#"routes"]){
NSArray *arr = [parsedJson objectForKey:#"routes"];
NSDictionary *dic = [arr objectAtIndex:0];
legs = [dic objectForKey:#"legs"];
for(int i = 0; i < legs.count; i++){
NSArray *stepsArr = [[legs objectAtIndex:i] objectForKey:#"steps"];
for (int i = 0; i < stepsArr.count; i++) {
[self.detailArray addObject:[[stepsArr objectAtIndex:i] objectForKey:#"html_instructions"] ];
string = [self.detailArray componentsJoinedByString:#","];
NSLog(#"string%#",string);
[self stringByStrippingHTML];
self.detail=[string componentsSeparatedByString:#","];
[self.detail retain];
}}}}
[detailView reloadData];
}
Also to explain why the table loads after you scroll the TableView; When you scroll in the table view the delegate method -(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath (among with others) will be called to update the tableview.