alertView from appDelegate does not switch view uppon buttonIndex - ios

Question

I am trying to create an alertView from the appDelegate but I cant get it to work. The alertView will act as a disclaimer when the app launches for the first time. I cant get it to work..the introViewcontroller does not appear. what am I doing wrong? ps. i use storyboards except for the intoViewController which is a nib file.my root view controller is a "fisrtViewController" here is my code: Thank you..
int a;
and in didFinishLaunchingWithOptions
if ( a == 0) {
UIAlertView *disclaimer = [[UIAlertView alloc] initWithTitle:#"Read Before use" message:#"By using this app you agree to its terms and conditions.\n\n\n\n\n\n\n\n\n\n\ntext heren\n\n\n\n\n\n\n\n\n\n\n\n\n" delegate:self cancelButtonTitle:#"No!" otherButtonTitles:#"Yes Let me In", nil];
[disclaimer show];
}
// Override point for customization after application launch.
return YES;
}
-(void) alertView:(UIAlertView *) alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
if (buttonIndex == 1) {
// FirstViewController *firstView = [[FirstViewController alloc] init];
a+=1;
// [self.viewController presentModalViewController:firstView animated:YES];
}
else if (buttonIndex == 2) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Sorry!" message:#"You are not allowed to use this app due to the fact that you did not agree to the terms and Conditions. Please exit this app!" delegate:self cancelButtonTitle:#"OK" otherButtonTitles:nil, nil];
[alert show];
if (buttonIndex ==1) {
introViewController *intro = [[introViewController alloc] initWithNibName:#"introViewController" bundle:nil];
[self.viewController presentModalViewController:intro animated:YES];
introViewController *intro = [[introViewController alloc] initWithNibName:#"introViewController" bundle:nil];
[self.viewController presentModalViewController:intro animated:YES];
}
}

Answer 1

ahh... Now I Understand what you are trying to do.
You problem is that self.viewController is not set before you try to present a new modal ViewController. Also, I think your buttonIndex is of by one.
Try instead:
if (buttonIndex == 1)
{
_window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
introViewController *intro = [[introViewController alloc] initWithNibName:#"introViewController" bundle:nil];
_window.rootViewController = _intro;
[_window makeKeyAndVisible];
}
Since your problem has nothing to to do with the UIAlertView, You might want to change the title and description of your question to make it more clear, for others struggling with a similar problem.
Happy coding! :)

Answer 2

The best way to handle this use a some NSString value write to NSUserDefaults file. when the app first time launch with the accepting the disclaimer (eg:#"accept") if user not accepting also update that NSString value accordingly.(#"notAccept").
In didFinishLaunchingWithOptions
if (![[[NSUserDefaults standardUserDefaults]valueForKey:#"key_disclaimer"] isEqualToString:#"accepted"]) {
UIAlertView *disclaimer = [[UIAlertView alloc] initWithTitle:#"Read Before use" message:#"By using this app you agree to its terms and conditions.\n\n\n\n\n\n\n\n\n\n\ntext heren\n\n\n\n\n\n\n\n\n\n\n\n\n" delegate:self cancelButtonTitle:#"No!" otherButtonTitles:#"Yes Let me In", nil];
[disclaimer show];
[disclaimer release];
// make sure to release it.
}
//if user accept the disclaimer.
[[NSUserDefaults standardUserDefaults]setValue:#"accepted" forKey:#"key_disclaimer"];
//if user not accept the disclaimer,
[[NSUserDefaults standardUserDefaults]setValue:#"notAccepted" forKey:#"key_disclaimer"];
update "key_disclaimer" accordingly. thats the best way. in your example the value of a using in the temporally. if you close and restart the app it will ask again the disclaimer.
in your code
int a;
replace it by using
int a = 0;
it will be ok.
thanx.

Answer 3

If your code is exactly like you wrote above, a won't be 0.
If you don't explicitly set it to 0 at startup, it might have any value.
If you want to check if the app was opened the first time after installing, use NSUserDefaults
e.g. (in didFinishWithOptions):
int startCount=[[NSUserDefaults standardUserDefaults] intForKey:#"startCount"];
if (startCount==0]){
//Is the first start, show your agreement
//Then increase startCount so that this will not be called at next start
[[NSUserDefaults standardUserDefaults] setInteger:startCount++ forKey:#"startCount"];
}
You could also store your version number in the NSUserDefaults. This way, you could check if the user first starts a new version.