Why am I getting an Apple Mach-O Linker error? - ios

Question

I'm trying to get a project working with Parse and Facebook. When running this project, the build fails and I get a Mach-O Linker Error:
Undefined symbols for architecture i386:
"_OBJC_CLASS_$_SLComposeViewController", referenced from:
objc-class-ref in Parse(PF_Twitter.o)
"_OBJC_CLASS_$_SLRequest", referenced from:
objc-class-ref in Parse(PF_Twitter.o)
"_SLServiceTypeTwitter", referenced from:
-[PF_Twitter getAccessTokenForReverseAuthAsync:localTwitterAccount:] in Parse(PF_Twitter.o)
-[PF_Twitter getLocalTwitterAccountAsync] in Parse(PF_Twitter.o)
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)
ViewController.h:
#import <UIKit/UIKit.h>
#import <Parse/Parse.h>
#interface ViewController : UIViewController
#end
// Implement both delegates
#interface DefaultSettingsViewController :
UIViewController <PFLogInViewControllerDelegate, PFSignUpViewControllerDelegate>
#end
And the ViewController.m:
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
// Sent to the delegate to determine whether the log in request should be submitted to the server.
- (BOOL)logInViewController:(PFLogInViewController *)logInController shouldBeginLogInWithUsername:(NSString *)username password:(NSString *)password {
// Check if both fields are completed
if (username && password && username.length != 0 && password.length != 0) {
return YES; // Begin login process
}
[[[UIAlertView alloc] initWithTitle:#"Missing Information"
message:#"Make sure you fill out all of the information!"
delegate:nil
cancelButtonTitle:#"ok"
otherButtonTitles:nil] show];
return NO; // Interrupt login process
}
// Sent to the delegate when a PFUser is logged in.
- (void)logInViewController:(PFLogInViewController *)logInController didLogInUser:(PFUser *)user {
[self dismissViewControllerAnimated:YES completion:NULL];
}
// Sent to the delegate when the log in attempt fails.
- (void)logInViewController:(PFLogInViewController *)logInController didFailToLogInWithError:(NSError *)error {
NSLog(#"Failed to log in...");
}
// Sent to the delegate when the log in screen is dismissed.
- (void)logInViewControllerDidCancelLogIn:(PFLogInViewController *)logInController {
[self.navigationController popViewControllerAnimated:YES];
}
// Sent to the delegate to determine whether the sign up request should be submitted to the server.
- (BOOL)signUpViewController:(PFSignUpViewController *)signUpController shouldBeginSignUp:(NSDictionary *)info {
BOOL informationComplete = YES;
// loop through all of the submitted data
for (id key in info) {
NSString *field = [info objectForKey:key];
if (!field || field.length == 0) { // check completion
informationComplete = NO;
break;
}
}
// Display an alert if a field wasn't completed
if (!informationComplete) {
[[[UIAlertView alloc] initWithTitle:#"Missing Information"
message:#"Make sure you fill out all of the information!"
delegate:nil
cancelButtonTitle:#"ok"
otherButtonTitles:nil] show];
}
return informationComplete;
}
// Sent to the delegate when a PFUser is signed up.
- (void)signUpViewController:(PFSignUpViewController *)signUpController didSignUpUser:(PFUser *)user {
[self dismissModalViewControllerAnimated:YES]; // Dismiss the PFSignUpViewController
}
// Sent to the delegate when the sign up attempt fails.
- (void)signUpViewController:(PFSignUpViewController *)signUpController didFailToSignUpWithError:(NSError *)error {
NSLog(#"Failed to sign up...");
}
// Sent to the delegate when the sign up screen is dismissed.
- (void)signUpViewControllerDidCancelSignUp:(PFSignUpViewController *)signUpController {
NSLog(#"User dismissed the signUpViewController");
}
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
if (![PFUser currentUser]) {
// Customize the Log In View Controller
PFLogInViewController *logInViewController = [[PFLogInViewController alloc] init];
[logInViewController setDelegate:self];
[logInViewController setFacebookPermissions:[NSArray arrayWithObjects:#"friends_about_me", nil]];
[logInViewController setFields: PFLogInFieldsFacebook | PFLogInFieldsDismissButton];
// Present Log In View Controller
[self presentViewController:logInViewController animated:YES completion:NULL];
}
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#end
Any help is appreciated, thanks.

Answer 1

From what I see, it seems like you didn't add the Social.framework in your project. Try to link it by following the intructions there :
Linking to a Library or Framework

Answer 2

Just add:
<framework>Social</framework>
to robovm.xml under <frameworks> tag.