Calling Objective-c function in swift

Question

Im trying to implement CometChat in my swift application. I managed to import the Objective-c framework successfully via a bridging header. But now I'm stuck trying to call Objective-C methods from swift.

This is the method from the interface i want to call:

- (void)loginWithURL:(NSString *)siteURL username:(NSString *)username password:(NSString *)password success:(void(^)(NSDictionary *response))success failure:(void(^)(NSError *error))failure;

And this is how the method is called from Objective-C:

 [cometChat loginWithURL:@"localhost/cometchat/" username:usernameTextField.text password:passwordTextField.text success:^(NSDictionary *response) { NSLog(@"SDK log : Username/Password Login Success %@",response); [self handleLogin]; } failure:^(NSError *error) { NSLog(@"SDK log : Username/Password Login Error%@",error); [self handleLoginError:@[@0,error]]; }];

So far i have this:

 cometChat.loginWithURL("localhost/cometchat/", username: EmailField.text, password: PasswordField.text){ (success: [NSDictionary], failure:NSError) in { println("did i make it here?") } }

The problem is, it says that there is missing argument "success", but its a mystery to me how it can be an argument, when it clearly returns the response. I want to know how to put together this method call. I also used the objectivec2swift converter, but it wasn't any help. Also, i have no clue what the @ means before the @[@0,error]

I know its a beginners question, but i already wasted a whole day on this, since i couldn't find any tutorials on how to call such "complex" Obj-C methods from swift.

SDS · Accepted Answer · 2015-09-17 05:43:41Z

Try this :-

cometChat.loginWithURL("localhost/cometchat/", username: "abc", password: "123", success: { (response) -> Void in print("SDK log : Username/Password Login Success \(response)") }) { ( error) -> Void in print("SDK log : Username/Password Login Error \(error)") }

Michael · Accepted Answer · 2015-09-16 19:34:12Z

When you look at the Objective-C signature, you see that the method takes two closures: success is a void function that takes a dictionary, and failure is a void function that takes an error.

In your Swift code you have only one closure: a void function that takes a dictionary and an error.

You either need to change the Objective-C method to take just one closure, or change the Swift code to provide two closures.

so something like (dont have access to the mac to test right now): cometChat.loginWithURL("localhost/cometchat/", username: EmailField.text, password: PasswordField.text){ (success: [NSDictionary]) in { println("did i make it here?") }, (failure:NSError) in{} }
Syntax is object.method (value1, param2: value2, param3: value3, param4: value4, param5: value5). That's not what you are writing. Read the Swift book. It seems you haven't learned the language but are just copying examples; that doesn't work. Again, read and understand the book.

gnasher729 · Accepted Answer · 2015-09-17 06:09:48Z

When you call a function, and the last parameter is a block / closure, then you can write the last parameter after the function call in { }. That applies to the last block only.

Anyway, you are trying to pass a closure with two parameters success and failure. You need to pass two closures, one as the success parameter of your function, with a parameter response, and one either as the failure parameter of your function, or following the function, with a parameter error.

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