How can I open the Settings app when the user presses a button?

Question

From what I understand by using code like this:

NSURL* appUrl = [NSURL URLWithString: @\"URL\"];
[[UIApplication sharedApplication] openURL:appUrl];
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Answer 1

In iOS 8 and later you can send the user to your app's settings in the following way:

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString]];