CODEWITHSUNDEEP
objective-ciosmacos
justderb
justderb

Reputation: 2854

How to tell when Safari is done loading a webpage

I'm trying to figure out if it's possible to track when Safari is done loading a page request. I call Safari to open using this code:

// Open Safari
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"http://www.example.com/" description]]];

But, since my app goes to the background, it may be suspended (and not able to execute code). Is this even possible to do within Xcode 4?

EDIT

The reason why I am doing this is because the UIWebView and Safari are not running at the same level and I want to do some performance related testing on some websites.

Upvotes: 0

Views: 511

Answers (3)

user529758
user529758

Reputation:

So, if you'd like to see how I did it for jailbroken iOS (instead of the quite boring "Not possible"): I basically hooked safari to get access to the particular method that is called when the page has finished loaing. Using MobileSubstrate (filter for com.apple.mobilesafari when injecting your dynamic library):

#import <substrate.h>
#import <UIKit/UIKit.h>

/* Some globals */
static IMP _orig_1, _orig_2;
static id tabController;

id _mod_1(id __self, SEL __cmd, CGRect frame, id tabDocument);
void _mod_2(id __self, SEL __cmd, id doc, BOOL error);


/* The library constructor */
__attribute__((constructor))
static void init()
{
    Class tabClass;

    tabClass = objc_getClass("TabController");

    MSHookMessageEx(tabClass, @selector(initWithFrame:tabDocument:),    
        (IMP)_mod_1, &_orig_1);
    MSHookMessageEx(tabClass, @selector(tabDocument:didFinishLoadingWithError:),
        (IMP)_mod_2, &_orig_2);
}


/* This hook merely captures the TabController of Safari. */
id _mod_1(id __self, SEL __cmd, CGRect frame, id tabDocument)
{
    __self = _orig_1(__self, __cmd, frame, tabDocument);
    tabController = __self;
    return __self;
}

/* This is called when the page loading is done */
void _mod_2(id __self, SEL __cmd, id doc, BOOL error)
{
    /* Make sure you always call the original method */
    _orig_2(__self, __cmd, doc, error);

    /* then do what you want */
}

Upvotes: 2

Joost
Joost

Reputation: 10413

This is not possible in general.

One thing you could do is from the page to be loaded, do a redirect to your application's URL scheme, which will launch your app. For more information on this matter, look at the -[UIApplicationDelegate application:openURL:sourceApplication:annotation:] method.

I don't think your application can reject the activation through such an URL scheme, so this means that your application will become active. Maybe the return value of the above method (which is a boolean) can be used, you'll have to test that.

This method also assumes that you have access to the page you're opening, so that you can add the redirect.

Upvotes: 1

Senior
Senior

Reputation: 2259

No, this is not possible. You can do this if you open the link in a UIWebView within your own application, however.

Upvotes: 0

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