Code works fine on iOS5 but not on iOS4.3 - iphone

Question

I have code that works fine on iOS5 but does not work on iOS4.3, I'm trying to display a loading screen with a progress bar from a navigation controller that has a UIViewController as the root view.
The problem is that on iOS4.3 the loading screen doesn't appear at the right time, it appears just before the view of the second view controller is displayed and then disappears quickly.
Here's the code :
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
// Override point for customization after application launch.
NSUserDefaults * standardUserDefaults = [NSUserDefaults standardUserDefaults];
CGSize s = [[UIScreen mainScreen] bounds].size;
[standardUserDefaults setObject:#"" forKey:#"display_resolution"];
if((int)s.width == 640 && (int)s.height == 960)[standardUserDefaults setObject:#"#2x" forKey:#"display_resolution"];
[standardUserDefaults synchronize];
AC_Loading *loading = [[[AC_Loading alloc] initWithNibName:#"AC_Loading_iPhone" bundle:nil] autorelease];
_navController0 = [[[UINavigationController alloc]initWithRootViewController:loading]autorelease];
_navController0.navigationBar.hidden = YES;
self.window.rootViewController = self.navController0;
[self.window makeKeyAndVisible];
return YES;
}
-
Edit
I figured out that the problem came from AC_Loading's code, this UIViewController has to display a loading screen with a progress view that updates according to database stat (I'm creating a sqlite3 database and updating it if needed and showing progress).While using this code on iOS5 works but it doesn't on iOS4.x I thought is because of the loop inside viewDidAppear (While pr<1.0):
#import "AC_Loading.h"
#import "database.h"
#import "AC_Menu.h"
#implementation AC_Loading
#synthesize logo;
#synthesize progress;
#synthesize informations;
#synthesize CLController;
float pr = 0.14;
int p = 0;
AC_Menu *menu;
NSUserDefaults *standardUserDefaults;
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
}
- (void)viewDidLoad
{
[super viewDidLoad];
standardUserDefaults = [NSUserDefaults standardUserDefaults];
[standardUserDefaults setObject:#"NO" forKey:#"geoloc"];
[standardUserDefaults synchronize];
NSLog(#"%#", [NSString stringWithFormat:#"intro%#%#", [standardUserDefaults stringForKey:#"display_resolution"], #".jpg"]);
[logo setImage:[UIImage imageNamed:[NSString stringWithFormat:#"intro%#%#", [standardUserDefaults stringForKey:#"display_resolution"], #".jpg"]]];
//[progress setProgressTintColor:[UIColor purpleColor]];
[progress setProgress:0.14];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)viewDidUnload
{
[self setLogo:nil];
[self setInformations:nil];
[self setProgress:nil];
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:YES];
}
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:YES];
database *DB = [[database alloc] init];
[DB checkDB];
NSString *message = #"Chargement des données";
if([DB isCreated]== NO && [DB upToDate] == NO && sqlite3_open([[DB getDBPath:[NSString stringWithFormat:#"%#%#%#", #"Restaurant_V", [DB getVersion], #".sqlite" ]] UTF8String], [DB getDB]) == SQLITE_OK)
{
message = #"Mise à jour des données";
[DB setExecuting:YES];
[NSThread detachNewThreadSelector:#selector(createDB) toTarget:DB withObject:nil];
while([DB isExecuting]==YES)
{
if([DB isExecuting]==NO) break;
}
NSLog(#"Cas 1");
}
if([DB isCreated]== YES && [DB upToDate] == NO && sqlite3_open([[DB getDBPath:[NSString stringWithFormat:#"%#%#%#", #"Restaurant_V", [DB getVersion], #".sqlite" ]] UTF8String], [DB getDB]) == SQLITE_OK)
{
[DB setExecuting:YES];
[NSThread detachNewThreadSelector:#selector(updateDB:) toTarget:DB withObject:[DB getVersion]];
while([DB isExecuting]==YES)
{
if([DB isExecuting]==NO) break;
}
NSLog(#"Cas 2");
}
int p = floor([progress progress]*100);
while (pr<1.0)
{
p = floor(pr*100);
if(p%14==0)
{
CFRunLoopRunInMode (kCFRunLoopDefaultMode, 0, true);
[progress setProgress:pr];
[informations setText:[NSString stringWithFormat:#"%# (%d%#", message, p, #"%)"]];
}
pr += 0.000002;
}
[progress setProgress:1.0];
[informations setText:[NSString stringWithFormat:#"%# (100%#", message, #"%)"]];
menu =
[[[AC_Menu alloc] initWithNibName:#"AC_Menu_iPhone" bundle:nil] autorelease];
[self.navigationController pushViewController:menu animated:YES];
[DB release];
CLController = [[CoreLocationController alloc] init];
CLController.delegate = self;
[CLController.locMgr startUpdatingLocation];
}
- (void)dealloc {
[CLController release];
[logo release];
[informations release];
[progress release];
[super dealloc];
}