问题
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
}
来源：https://stackoverflow.com/questions/19690170/how-to-detect-if-facebook-app-is-installed-on-ios