How to detect if Facebook app is installed on iOS?

问题:

This question already has answers here:

How to check programmatically if an App is installed? (6 answers)

How can I determine if a user has an iOS app installed? (4 answers)

Closed 6 years ago.

On iOS, you can launch the Facebook app and link to a profile by opening a url like this: fb://profile/12345

The only problem is that if the Facebook app isn't installed, nothing happens.

Is there a way to detect if the app is installed or if the url scheme fb:// is supported?

This would apply broadly to other apps like Twitter as well.

回答1:

BOOL isInstalled = [[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:@"fb://"]]

if (isInstalled) {

} else {

}

回答2:

Try just using the canOpenURL: function

NSURL *fbURL = [NSURL URLWithString:@"fb://"];//or whatever url you're checking

if ([[UIApplication sharedApplication] canOpenURL:fbURL])
{
  //open it etc  
}