무료앱에서 유료 앱 링크 걸때..

- (IBAction)buyFullVersionButtonPressed {

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"http://phobos.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=xxxxxxxxx"]];

}

Replace "xxxxxxx" with your app's ID.