APP版本检测

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        NSString *version = @"";
        NSURL *url = [NSURL URLWithString:@"http://itunes.apple.com/lookup?id=<Your app ID>"];
        versionrequest = [ASIFormDatarequest requestWithURL:url];
        [versionrequest setrequestMethod:@"GET"];
        [versionrequest setDelegate:self];
        [versionrequest setTimeOutSeconds:150];
        [versionrequest addrequestHeader:@"Content-Type" value:@"application/json"]; 
        [versionrequest startSynchronous];

        //Response String of our REST call
        NSString* jsonResponseString = [versionrequest responseString];

        NSDictionary *loginAuthenticationResponse = [jsonResponseString objectFromJSONString];

        NSArray *configData = [loginAuthenticationResponse valueForKey:@"results"];

        for (id config in configData) 
        {
            version = [config valueForKey:@"version"];
        }
        //check your version with the version in app store
        if (![version isEqualToString:[itsUserDefaults objectForKey:@"version"]]) 
        {
            ProalertView *createUserResponseAlert = [[ProalertView alloc] initWithtitle:@"New Version!!" message: @"A new version of app is available to download" delegate:self cancelButtontitle:@"Cancel" otherButtontitles: @"Download",nil];
        [createUserResponseAlert show]; 
        [createUserResponseAlert release];
        }

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