button or label not working - ios

Question

When I try to change the text of a label on button click, the code compiles but it doesn't work. I click the button and nothing happens.
Currently, im just trying to display "Error" on label x1Label when button solveButton will be pressed. Could you please help me fixing it?
.h
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
#synthesize errorLabel;
#synthesize aField, bField, cField;
#synthesize x1Label, x2Label;
#synthesize solveButton;
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
aField.delegate = self;
bField.delegate = self;
cField.delegate = self;
aField.keyboardType = UIKeyboardTypeNumberPad;
bField.keyboardType = UIKeyboardTypeNumberPad;
cField.keyboardType = UIKeyboardTypeNumberPad;
NSString *str = #"car";
errorLabel.text = str;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
[aField resignFirstResponder];
[bField resignFirstResponder];
[cField resignFirstResponder];
return YES;
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
[aField resignFirstResponder];
[bField resignFirstResponder];
[cField resignFirstResponder];
}
- (IBAction)solveButton:(id)sender
{
errorLabel.text = #"Error";
}
#end
.m
#import <UIKit/UIKit.h>
#interface ViewController : UIViewController <UITextFieldDelegate>
{
IBOutlet UITextField *aField, *bField, *cField;
}
#property (weak, nonatomic) IBOutlet UILabel *errorLabel;
#property (strong, nonatomic) IBOutlet UITextField *aField;
#property (strong, nonatomic) IBOutlet UITextField *bField;
#property (strong, nonatomic) IBOutlet UITextField *cField;
#property (weak, nonatomic) IBOutlet UILabel *x1Label;
#property (weak, nonatomic) IBOutlet UILabel *x2Label;
#property (weak, nonatomic) IBOutlet UIButton *solveButton;
#end
Thank you

Answer 1

You are writing on errorLabel not on x1Label.
Did you connect the SolveButton action to the button in your storyboard?
if not go to storyboard > click on your button > go to Connection Inspector (on the right panel) and link the action to you button.