UIView not updating in iPhone App - ios

Question

I am new to iPhone App development, below is 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.
[self updateMyView];
}
- (IBAction)clickButtonResult:(id)sender
{
enteredText = [textField text]; // Or textField.text
NSLog(#"Number 1 : %i", number_1);
NSLog(#"Number 2 : %i", number_2);
NSLog(#"Entered Text is %#", enteredText);
int NUM_RESULT = number_1 + number_2;
verify_result = [NSString stringWithFormat:#"%i", NUM_RESULT];
NSLog(#"Verify Result : %#", verify_result);
NSString *final_result = [NSString stringWithFormat:#"%d", [enteredText isEqualToString:verify_result]];
int final_int_result = [final_result integerValue];
if (final_int_result) {
//result_label.text = #"Correct";
NSLog(#"Correct");
[self updateMyView];
} else {
//result_label.text = #"Wrong";
NSLog(#"Wrong");
}
}
- (int)getRandomNumberBetween:(int)min maxNumber:(int)max
{
return min + arc4random() % (max - min + 1);
}
- (void) updateMyView
{
number_1 = [self getRandomNumberBetween:10 maxNumber:99];
number_2 = [self getRandomNumberBetween:10 maxNumber:99];
num_1.text = [NSString stringWithFormat:#"%i", number_1];
num_2.text = [NSString stringWithFormat:#"%i", number_2];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#end
and ViewController.h
#import <UIKit/UIKit.h>
#interface ViewController : UIViewController
{
IBOutlet UILabel *num_1;
IBOutlet UILabel *num_2;
IBOutlet UILabel *result_label;
IBOutlet UITextField *textField;
int number_1;
int number_2;
NSString *verify_result;
NSString *enteredText;
BOOL display_result;
}
- (IBAction)clickButtonResult:(id)sender;
#end
After entering the correct result the UIView should be updated with updateMyView function but it is not happening.
Can anyone help here??

Answer 1

First of all, start using Properties.
ViewController.h
#interface ViewController : UIViewController
#property (nonatomic, weak) IBOutlet UILabel *num_1;
#property (nonatomic, weak) IBOutlet UILabel *num_2;
#property (nonatomic, weak) IBOutlet UILabel *resultLabel;
#property (nonatomic, weak) IBOutlet UITextField *textField;
#property (nonatomic) NSInteger number_1;
#property (nonatomic) NSInteger number_2;
#property (nonatomic, strong) NSString *verifyResult;
#property (nonatomic, strong) NSString *enteredText;
#property (nonatomic) BOOL displayResult;
- (IBAction)clickButtonResult:(id)sender;
#end
In ViewController.m code use self.{name of property}, for example self.textField for the textField property.
Now, go to Interface builder and connect the IBOutlet properties to the right objects. (click with right button on File's Owner)

Answer 2

Try changing num_1.text in viewDidLoad to make sure you have access to that label from your UIViewController.
So in viewDidLoad, just put something like
num1.text = #"Updated from viewDidLoad"

Answer 3

Make sure that you have connected num_1 and num_2 with the UILabels properly. It seems that you have not connected these.

Answer 4

Just move [self updateMyView]; outside the if statements in clickButtonResult: function
then it will update the view when click the button.
if (final_int_result) {
//result_label.text = #"Correct";
NSLog(#"Correct");
} else {
//result_label.text = #"Wrong";
NSLog(#"Wrong");
}
[self updateMyView];