Keychain search query

- [Instructor] Now let's look at how we can use … this SecItemCopyMatching in our code … to fetch an item out of a keychain. … So back in Xcode, … I'm going to create a new function up here at the top. … So after the class declaration on line nine, … I'll create some empty lines … and a new function on line 11. … I'll make it static func retrievePassword. … And we only have to pass in the username. … So I'll pass in username as a string … and we're going to return a string optional … because we may not find a password. … And then the next thing I'm going to do is create my query … specifying how I want to find this. … It's very similar to how we added it, … so I'm actually going to copy lines 38 through 41, … the query from our original store login function, … and I'm going to paste that on line 12. … So now I've got this query, … but we're not passing in the password anymore. … So I'll delete this line where we pass in the password data. … I'm just going to pass in the username … and I'll delete the comma at the end of that line. …