Open IOS App Using URL Scheme and Pass Data For Registration - ios

Question

i have implemented URL Scheme in my App so that whenever i click the URL, it will open up my app. I have also inserted some request in the URL such as
Yuvtime//:?registerName=Puppy&Passwords=67825
and i use the openUrl in AppDelegate to handle the processing of the URL and pass the data (registerName=Puppy&Passwords=67825`) to my rootViewController which is the registration page of my app, the code is as shown below.
- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation{
// Check the calling application Bundle ID
if ([[url scheme] isEqualToString:#"yuvitime"])
{
NSLog(#"Calling Application Bundle ID: %#", sourceApplication);
NSLog(#"URL scheme:%#", [url scheme]);
self.yuvitimeRequest = [url query];
NSLog(#"URL query: %#", yuvitimeRequest);
return YES;
}
else
return NO;
}
And in the RegistrationviewController, I implemented the code as follows.
-(void)viewWillAppear:(BOOL)animated{
[super viewDidAppear:animated];
AppDelegate * myAppDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
self.requestFromURL = myAppDelegate.yuvitimeRequest;
NSLog(#"%# hello google", self.requestFromURL);
if (self.requestFromURL.length > 0){
self.isRequestFromURL = YES;
}
if(self.isRequestFromURL == YES){
self.mainViewController.joinRoomName = self.requestFromURL;
self.isRequestFromURL = NO;
self.requestFromURL = #"";
[self presentViewController:self.mainViewController animated:YES completion:nil];
}
}
However, the problem i encounter is that:
If the user already has its app opened, this viewWilAppear in the RegistrationViewController will not be called again, so the data will not be passed automatically from the URL. (Only by killing the app, and click the URL will the data be passed as what we initially desired).
I also understand that when an App is already open and called again, only
(void)applicationWillEnterForeground:(UIApplication *)application &
(void)applicationDidBecomeActive:(UIApplication *)application
will be called in sequence in the app delegate. But somehow i stuck on how do i pass data to my registrationViewController from these two methods and if i can manage to do it in these two application methods, that would mean that my app checks every time on whether there is any registration data available from URL when the app comes to the foreground.
Since we already have the
(BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation
to handle the URL scheme, is it possible that we only check once without using the foreground and didBecomeActive app delegate functions when we click the URL?
EDIT: After implementing URL scheme, whenever you click a URL, a delegate method in AppDelegate.m will be triggered.
- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation;
This is also the function that will enable us to process the URL in our app and pass it around to other viewControllers.
I was kinda thinking, is there a way that we can implement a notification/function such that only when this openURL function is called, we then call the triggerURL function in registrationViewController.
Just out of curiosity!
Thanks
Regards

Answer 1

In your RegistrationViewController, you can register for UIApplicationDidBecomeActiveNotification and get notified of application being awakened even when your view controller was already loaded.
Add this line in your loadView:
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(triggerURL) name:UIApplicationDidBecomeActiveNotification object:[UIApplication sharedApplication]];
This will allow the function updateSettings to be called every time your app wakes. Also remember to remove this listener at the end by:
[[NSNotificationCenter defaultCenter] removeObserver:self];
in your dealloc method.
Post that, this is how your viewWillAppear & triggerURL will look like:
- (void)viewWillAppear:(BOOL)animated{
[super viewDidAppear:animated];
[self triggerURL];
}
- (void)triggerURL {
AppDelegate * myAppDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
self.requestFromURL = myAppDelegate.yuvitimeRequest;
NSLog(#"%# hello google", self.requestFromURL);
if (self.requestFromURL.length > 0){
self.isRequestFromURL = YES;
}
if(self.isRequestFromURL == YES){
self.mainViewController.joinRoomName = self.requestFromURL;
self.isRequestFromURL = NO;
self.requestFromURL = #"";
[self presentViewController:self.mainViewController animated:YES completion:nil];
}
}