Xcode segment controller error - ios

Question

I have an issue when I click on the segment controller in the simulator.
Here's my code
#import "ViewController.h"
#interface ViewController ()
#property (weak, nonatomic) IBOutlet UITextField *inputField;
#property (weak, nonatomic) IBOutlet UILabel *outputField;
#property (weak, nonatomic) IBOutlet UISegmentedControl *segmentController;
#end
#implementation ViewController
- (IBAction)updateButton:(id)sender {
NSMutableString *buf = [NSMutableString new];
switch (self.segmentController.selectedSegmentIndex) {
case 0:
[buf appendString: #"unit two"];
break;
case 1:
[buf appendString: #"unit three"];
break;
default:
[buf appendString: #"unit four"];
break;
}
self.outputField.text = buf;
}
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#end
Here's the error I get:
2016-07-29 17:40:45.506 UnitConverter[3213:534645] -[ViewController segmentController:]: unrecognized selector sent to instance 0x7fae71dbd040 2016-07-29 17:40:45.509 UnitConverter[3213:534645] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[ViewController segmentController:]: unrecognized selector sent to instance 0x7fae71dbd040'

Answer 1

It's looking for the method segmentController, but your class doesn't have one. Right click on the Segment Controller in IB and remove and re-add the connection to. You may have more than one Action connected. Click the little X to remove them.
- (IBAction)updateButton:(id)sender