Can't change label.text and don't know why - ios

Question

I want to change label.text but when I do it and check it with a NSLog it returns me a (null).
Here's my code:
NextViewController.h
#interface NextViewController (){
NSTimer *timerTen;
NSInteger countDown;
NSString *timer;
}
#end
#implementation NextViewController
static UILabel *lblTest;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
-(void)startCountDown{
countDown = 10;
timerTen = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:#selector(dismissView) userInfo:nil repeats:YES];
}
-(void)dismissView{
timer = [NSString stringWithFormat:#"%ld", (long)countDown];
_lbl_countDown.text = timer;
NSLog(#"\nCountDown: %#\n", self.lbl_countDown.text);
countDown--;
if (countDown <= 0) {
SectionViewController *sectionView = [[SectionViewController alloc] init];
[sectionView.presentedViewController dismissViewControllerAnimated:YES completion:nil];
}
}
Then I have a XIB file with a label and more things, so I've used a prop right there in the .h to change it from other classes, but I can't change it.
NextViewController.h
#import <UIKit/UIKit.h>
#interface NextViewController : UIViewController
#property (strong, nonatomic) IBOutlet UILabel *lbl_section;
#property (strong, nonatomic) IBOutlet UILabel *lbl_nextSection;
#property (strong, nonatomic) IBOutlet UILabel *lbl_countDown;
-(void)startCountDown;
#end
Hope anyone can help me cause I don't know what is happening here.
Thanks.

Answer 1

Call your method in ViewDidLoad or ViewWillAppear
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
[self startCountDown]
}
OR
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
[self startCountDown]
}

Answer 2

Try to call the function first using [self startCountDown] in the ViewDidLoad method
if the problem persist:
Try to use this : [_lbl_count setText#"myText"];
In the Identity Inspector, click on the label uncheck the 'Static Text' and check 'Enabled' and 'User Interaction Enabled'
Finally check that your variable timer is not null after your initialization.
timer = [NSString stringWithFormat:#"%ld", (long)countDown];
Hope that will be helpfull

Answer 3

I wrote this code to use a button tap to start a countdown from 10 to a segue:
In my h:
#property (strong, nonatomic) IBOutlet UILabel *countdownCounter;
#property (strong, nonatomic) IBOutlet UIButton *countdownStarter;
In my m:
static NSTimer *timer;
static int remainingCounts;
.
.
-(void)countDown
{
if (--remainingCounts == 0)
{
[timer invalidate];
timer = nil;
[self performSegueWithIdentifier:#"FromStartToBalancer" sender:self];
}
else
{
NSString * holdText = [NSString stringWithFormat:#"%d", remainingCounts];
[self.countdownCounter setText:holdText];
}
}
- (IBAction)goToBalancerPressed:(UIButton *)sender
{
self.countdownStarter.userInteractionEnabled = NO;
self.countdownStarter.alpha = .3;
remainingCounts = 10;
timer = [NSTimer scheduledTimerWithTimeInterval:1
target:self
selector:#selector(countDown)
userInfo:nil
repeats:YES];
}