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The objective c code seems like this: 

- (void)signInAccountWithUserName:(NSString *)userName password:(NSString *)password completion:(void (^)(BOOL success))completionBlock { // Log into the account with `userName` and `password`... // BOOL loginSuccessful = [LoginManager contrivedLoginMethod]; // Notice that we are passing a BOOL back to the completion block. if (completionBlock != nil) completionBlock(loginSuccessful); }

and this method usage is:

[self signInAccountWithUserName:@"Bob" password:@"BobsPassword" completion:^(BOOL success) { if (success) { [self displayBalance]; } else { // Could not log in. Display alert to user. } }];

How can I implement it in Swift? What is the equivalent implementation?

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func signInAccount(username:NSString!, password:NSString!, completionBlock:((Bool)->())?) { if completionBlock { completionBlock!(true) } } signInAccount("Bob", "BobPassword") { (var success) in println("\(success)") }; signInAccount("Bob", "BobPassword", nil)
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This is how you would implement methods with callbacks in swift.

func signInAccountWithUsername(userName:String!, password: String!, completion: (Bool) -> Void){ completion(false) } signInAccountWithUsername("Swift", "secret swift", { success in if success{ println("Success") }else{ println("Failure") } })
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