CODEWITHSUNDEEP
objective-cswift
ChrisSmathers
ChrisSmathers

Reputation: 127

I need to call an Objective C method from Swift

I have this interface in Objective C that I am trying to call from Swift and it does not seem fall into the completion code. Not sure what I am missing! 

@interface WPLogin : NSObject

/*!
 * @brief Logs into the application returning success or failure with an error     object.
 * If login is successful the credential is automatically stored
 *
 * @param serverURLString   Address to login to
 * @param username  Username to login with
 * @param password  Password for user
 * @param completion Completion block to be called after attempting login
 */
- (void)loginToURL:(NSString *)serverURLString
      withUsername:(NSString *)username
              password:(NSString *)password
        completion:(void (^)(WPLoginStatus success, NSError * error))completion;

@end

the calling function from Swift looks like this...

    var uid = "test"
    var pwd = "test"
    var url = "http://www.google.com"
    var loginAuth = WPLogin();

        loginAuth.loginToURL(url, withUsername: uid, password: pwd, completion: { (status:WPLoginStatus, error:NSError!) -> Void in
            println("Inside Login")
    })

bridging file

#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>
#import "WPLogin.h"

version that works in Objective C 

if (!self.login) {
    self.login = [WPLogin new];
}

[self.login loginToURL:url
                       withUsername:uid
                           password:pwd
                         completion:^(WPLoginStatus status, NSError *error) {
                                NSLog(@"complete");
                          }];

Upvotes: 0

Views: 417

Answers (1)

matt
matt

Reputation: 535138

The problem is that in your Swift version the WPLogin object is a local variable (var loginAuth). Therefore it dies before it has a chance to do anything. Make it a property, as in your Objective-C version (self.login):

class MyClass {
    var login : WPLogin = WPLogin()
    func myMethod () {
        var uid = "test"
        var pwd = "test"
        var url = "http://www.google.com"
        self.login.loginToURL(url, withUsername: uid, password: pwd, completion: { 
            (status:WPLoginStatus, error:NSError!) -> Void in
            println("Inside Login")
        })
    }
}

This object needs to take action over time - going out on the Internet, logging in, calling your completion handler - and it cannot do that if it dies instantly, as it does in your Swift code. It must persist over significant time.

Upvotes: 1

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