Alert when leaving WebView for AppStore

[TwanB]

I have an app using WebView. I want an alert (UIAlertView) when the link to the AppStore is clicked with 2 choices:
1) Open AppStore? (then open the native AppStore app)
2) Cancel (close alert and go back to my app)

I have this code to open the AppStore link from the WebView:

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
    
    if ([request.URL.host hasSuffix:@".apple.com"]){
        [[UIApplication sharedApplication] openURL: request.URL ];
        return NO;
    }
    
    return YES;
}

Any help on this is very much appreciated!

Ciao,
T

[harrytheshark]

Something like this:

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
    
    if ([request.URL.host hasSuffix:@".apple.com"]){
        UIAlertView * alert = [[UIAlertView alloc] initWithTitle:@"Leave the app?"
								message:@"Do you want to leave (appname) and visit the AppStore?" 
								delegate:self 
								cancelButtonTitle:@"Nah" 
								otherButtonTitles:@"Sure"];
		
	[alert show];
	[alert release];
        return NO;
    }
    
    return YES;
}

-(void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex {
	
	if (buttonIndex == 1){
		//go to the url
	}
}

You're going to need to save the url so the alertView method can call it.

Hope that helps.

[TwanB]

Originally Posted by harrytheshark

Something like this:

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
    
    if ([request.URL.host hasSuffix:@".apple.com"]){
        UIAlertView * alert = [[UIAlertView alloc] initWithTitle:@"Leave the app?"
								message:@"Do you want to leave (appname) and visit the AppStore?" 
								delegate:self 
								cancelButtonTitle:@"Nah" 
								otherButtonTitles:@"Sure"];
		
	[alert show];
	[alert release];
        return NO;
    }
    
    return YES;
}

-(void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex {
	
	if (buttonIndex == 1){
		//go to the url
	}
}

You're going to need to save the url so the alertView method can call it.

Hope that helps.

Thanks for the reply!
I'm fairly new to Obj.C. Could you help me with saving the URL to have AlertView call the method?

Thanks!

_Twan

[harrytheshark]

No problem.
In your .h file, declare the NSURL:

NSURL * theURL;

Then when you call your UIAlertView, set the NSURL by doing:

theURL = [request.URL retain];

Then when you're finished with it, be sure to release it:

[theURL release];

[TwanB]

Originally Posted by harrytheshark

No problem.
In your .h file, declare the NSURL:

NSURL * theURL;

Then when you call your UIAlertView, set the NSURL by doing:

theURL = [request.URL retain];

Then when you're finished with it, be sure to release it:

[theURL release];

hmzmmz, I feel kinda sheepish now.. still a lot to learn. (do I dare to ask?...) But how exactly do I declare the NSURL?

My .h-file looks like this:

@interface MainMainMain : NSObject <UIApplicationDelegate> {
	
	IBOutlet UIWebView *mainView;
	IBOutlet UIActivityIndicatorView *activityIndicator;
}

- (IBAction)refreshClicks:(id)sender;

@property (nonatomic, retain) UIWebView *mainView;
@property (nonatomic, retain) UIActivityIndicatorView *activityIndicator;

@end

[harrytheshark]

Where your IBOutlets are:

@interface MainMainMain : NSObject <UIApplicationDelegate> {
	
	IBOutlet UIWebView *mainView;
	IBOutlet UIActivityIndicatorView *activityIndicator;
        NSURL * theURL;
}

- (IBAction)refreshClicks:(id)sender;

@property (nonatomic, retain) UIWebView *mainView;
@property (nonatomic, retain) UIActivityIndicatorView *activityIndicator;

@end

[TwanB]

Originally Posted by harrytheshark

Where your IBOutlets are:

@interface MainMainMain : NSObject <UIApplicationDelegate> {
	
	IBOutlet UIWebView *mainView;
	IBOutlet UIActivityIndicatorView *activityIndicator;
        NSURL * theURL;
}

- (IBAction)refreshClicks:(id)sender;

@property (nonatomic, retain) UIWebView *mainView;
@property (nonatomic, retain) UIActivityIndicatorView *activityIndicator;

@end

I tried that, but I get the error in my .m stating 'request undeclared'

-(void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex {
	
	if (buttonIndex == 1){
		NSURL * theURL = [request.URL retain];
		[theURL release];
	}

[harrytheshark]

You want to assign the URL when you pop up your uialertview, not afterwards.

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
    
    if ([request.URL.host hasSuffix:@".apple.com"]){
        theURL = [request.URL retain];
        UIAlertView * alert = [[UIAlertView alloc] initWithTitle:@"Leave the app?"
								message:@"Do you want to leave (appname) and visit the AppStore?" 
								delegate:self 
								cancelButtonTitle:@"Nah" 
								otherButtonTitles:@"Sure"];
		
	[alert show];
	[alert release];
        return NO;
    }
    
    return YES;
}

-(void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex {
	
	if (buttonIndex == 1){
		//go to the url
	}

        [theURL release];
}

[TwanB]

Originally Posted by harrytheshark

You want to assign the URL when you pop up your uialertview, not afterwards.

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
    
    if ([request.URL.host hasSuffix:@".apple.com"]){
        theURL = [request.URL retain];
        UIAlertView * alert = [[UIAlertView alloc] initWithTitle:@"Leave the app?"
								message:@"Do you want to leave (appname) and visit the AppStore?" 
								delegate:self 
								cancelButtonTitle:@"Nah" 
								otherButtonTitles:@"Sure"];
		
	[alert show];
	[alert release];
        return NO;
    }
    
    return YES;
}

-(void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex {
	
	if (buttonIndex == 1){
		//go to the url
	}

        [theURL release];
}

Ah great. rooky mistakes indeed

How is it possible, that this works in the 3.1.3 simulator, but when I install it on my own iPhone device 3.1.3 the app closes when I click the link?

[harrytheshark]

Check that you're not over releasing anything, if you have other UIAlertViews, make sure not to release "theURL" when they are dismissed.

You can also do a google for "NSZombieEnabled" which can help debug this kind of error.

[TwanB]

Originally Posted by harrytheshark

Check that you're not over releasing anything, if you have other UIAlertViews, make sure not to release "theURL" when they are dismissed.

You can also do a google for "NSZombieEnabled" which can help debug this kind of error.

Thanks for all your help! I got it to work. You forgot the

 nil

I used the code like this:

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
	
	if ([request.URL.host hasSuffix:@".apple.com"]){
		theURL = [request.URL retain];
		UIAlertView * alert = [[UIAlertView alloc] initWithTitle:@"Go to the AppStore?"
														 message:@"" 
														delegate:self 
											   cancelButtonTitle:@"Cancel" 
											   otherButtonTitles:@"OK", nil];
		
		[alert show];
		[alert release];
		return NO;
	} 
	return YES;
}

// defining action for pressing 'OK' and calling method theURL
-(void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex {
	
	// by clicking 'OK' go to the url
	if (buttonIndex == 1){
		[[UIApplication sharedApplication] openURL: theURL];
		
	}
	[theURL release];
}

To show you my gratitude, I'd like to give you a promo-code to my app, if you'd like that. IM me for that!

Ciao,
Twan

[harrytheshark]

Oops, my bad!

I'm the UK and they don't work over here, so don't worry about it. I'm glad you got it working!

Tom