UIActivityIndicator not displayed - iphone

Question

I have a FirstView loaded with tableView and when a accessory button of tableviewCell is tapped then it goes to SecondView.The data in SecondView is loaded from service url and so it takes time.So I need to show activityIndicator when accessorybutton is tapped, stop it after loading the whole data .BUt I couldnot see the activityindicator getting displayed.
This is the code Im working on :
- (void) tableView:(UITableView *)tableView accessoryButtonTappedForRowWithIndexPath:(NSIndexPath *)indexPath
{
activityIndicator = [[UIActivityIndicatorView alloc]initWithFrame:CGRectMake(143, 220, 37, 37)];
activityIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyleGray;
activityIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
activityIndicator.color = [UIColor redColor];
[scrollView addSubView:activityIndicator];
[activityIndicator startAnimating];
activityIndicator.frame=CGRectMake(140, 195, 37, 37);
[activityIndicator startAnimating];
SecondView *secView = [[SecondView alloc] initWithNibName:#"SecondView" bundle:nil];
secView.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
UITableViewCell* cell = [tableView cellForRowAtIndexPath:indexPath];
UILabel *name1 = (UILabel*)[cell viewWithTag:111];
secView.provName = [name1 text];
[self presentModalViewController: secView animated:NO];
[secView release];
}
Where I m going wrong?
EDIT:
SecondView:
-(void)viewWillAppear:(BOOL)animated
{
activityIndictr = [[UIActivityIndicatorView alloc]initWithFrame:CGRectMake(143, 220, 37, 37)];
activityIndictr.activityIndicatorViewStyle = UIActivityIndicatorViewStyleGray;
activityIndictr.color = [UIColor redColor];
[testscroll addSubview:activityIndictr];
[activityIndictr startAnimating];
}
-(void)viewDidLoad
{
[super viewDidLoad]
// I m calling many service urls(10) and assigning to labels and tableview
[activityIndictr stopAnimating];
}

Answer 1

You should call the activity indicator in the SecondView's ViewWillAppear , so that immediately after pushing in this view the activity indicator starts and then dismiss it when all the data is parsed from the url.
This is because the Second View Controller will be pushed almost immediately and the data will take time to load

Answer 2

You allocate two activity indicators, throw the first one away, then start animating the second one twice and never add any activity indicator into any existing view. No wonder it’s not showing up. Try [[secView view] addSubview:activityIndicator] or something similar.

Answer 3

Do this in viewWillAppear of SecondView :
activityIndicator = [[UIActivityIndicatorView alloc]initWithFrame:CGRectMake(143, 220, 37, 37)];
activityIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyleGray;
[self.view addSubview:activityIndicator];
[activityIndicator startAnimating];

Answer 4

Again I have updated the answer.
put this code in appdelegate And define static object in appdelegate like below
static UIActivityIndicatorView *activityView;
+(void)showActivityIndicator{
if (!activityView) {
activityView = [[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
activityView.center = CGPointMake(160, 230);
[activityView startAnimating];
UIWindow *win = [UIApplication sharedApplication].keyWindow;
[win addSubview:activityView];
}
}
+(void)removeActivityIndicator{
if ([activityView superview]) {
[activityView removeFromSuperview];
activityView = nil;
}
}
- (void) tableView:(UITableView *)tableView accessoryButtonTappedForRowWithIndexPath:(NSIndexPath *)indexPath
{
UIWindow *window = [UIApplication sharedApplication].keyWindow;
//global static activity indicator... you can access from any other view controlller
[AppDelegate showActivityIndicator];
}
And after getting response
[AppDelegate removeActivityIndicator];