Question

How to check particular app is already installed on iphone device or not?
How we can achieve this any idea?

Answer 1

canOpenURL is the essentially checks whether the app that is registered to that particular URL scheme is installed or in other words if the app exists, and if it is, we can open the URL.

- (BOOL) appExists: (NSURL*)url{
    if ([[UIApplication sharedApplication] canOpenURL:url]) {        
        return YES;

    } else {
        return NO;
    }
}


NSURL *urlApp = [NSURL URLWithString:@"fb://profile/73728918115"];// facebook app

NSURL *urlApp = [NSURL URLWithString: [NSString stringWithFormat:@"%@", @"twitter:///user?screen_name=INNOVA_ET_BELLA"]];//tweeter app

if ([self appExists:urlApp]) {
        [[UIApplication sharedApplication] openURL:urlApp];
} 

IPhone URL Schemes:

http://wiki.akosma.com/IPhone_URL_Schemes

Custom URL Schemes:

http://mobiledevelopertips.com/cocoa/launching-your-own-application-via-a-custom-url-scheme.html