Unable to get NSTimer to work - iphone

Question

Using NSTimer for my application in which I have to show countdown timer with initial timing equal to 100sec. It shows 99,then 98..96..94..92...86 and so on. But I want each sec to show up. Here is my code....
-(void)updateTimerLabel{
if (timeRemaining>0 ) {
timeRemaining=timeRemaining-1.0;
timerLabel.text=[NSString stringWithFormat:#"%.0f", timeRemaining];
countdownTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:#selector(updateTimerLabel) userInfo:nil repeats:YES];
}
}

Answer 1

Try following code
int i =100;
-(void)viewDidLoad
{
[super viewDidLoad];
[NSTimer scheduledTimerWithTimeInterval:1 target:self selector:#selector(theActionMethod) userInfo:nil repeats:YES];
}
-(void)theActionMethod
{
if(i > 0)
{
NSString *str = [NSString stringWithFormat:#"%d",i];
lbl.text = str;
}
i--;
}

Answer 2

You are actually re-creating the timer every time your method gets called.
You should try leaving that outside and retaining it until you're finished with it.
#interface SomeClass
NSTimer * aTimer;
#end
#implementation
- (void)createTimer {
aTimer = [[NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:#selector(updateTimerLabel) userInfo:nil repeats:YES] retain];
}
- (void)updateTimerLabel {
// do timer updates here
// call [aTimer release]
// and [aTimer invalidate]
// aTimer = nil;
// when you're done
}
#end

Answer 3

you have call updateTimerLabel outside the method.
ex:
-(void)viewDidLoad{timeRemaining=100.0;[self updateTimerLabel];countdownTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:#selector(updateTimerLabel) userInfo:nil repeats:YES];}
-(void)updateTimerLabel
{if (timeRemaining>0 )
{timeRemaining=timeRemaining-1.0;NSLog(#"%#",[NSString stringWithFormat:#"%.0f",timeRemaining]);}}