Implementing a Countdown Timer in Objective-c?
ios, iphone, nstimer, objective-c
Solution
You can do it like this(ARC Enabled):-
@interface ViewController()
{
UILabel *progress;
NSTimer *timer;
int currMinute;
int currSeconds;
}
@end
@implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
progress=[[UILabel alloc] initWithFrame:CGRectMake(80, 15, 100, 50)];
progress.textColor=[UIColor redColor];
[progress setText:@"Time : 3:00"];
progress.backgroundColor=[UIColor clearColor];
[self.view addSubview:progress];
currMinute=3;
currSeconds=00;
// Do any additional setup after loading the view, typically from a nib.
}
-(void)start
{
timer=[NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(timerFired) userInfo:nil repeats:YES];
}
-(void)timerFired
{
if((currMinute>0 || currSeconds>=0) && currMinute>=0)
{
if(currSeconds==0)
{
currMinute-=1;
currSeconds=59;
}
else if(currSeconds>0)
{
currSeconds-=1;
}
if(currMinute>-1)
[progress setText:[NSString stringWithFormat:@"%@%d%@%02d",@"Time : ",currMinute,@":",currSeconds]];
}
else
{
[timer invalidate];
}
}
Problem
I am new to iOS programming. I am working on words matching game. In this game I need to implement time counter which shows minutes and seconds. I want when my game is started my timer to start with 3 minutes. Now I want to decrease this timer in reverse direction with seconds. my code just work for seconds..here is my code: ``` secondsLeft--; int seconds = (secondsLeft %3600) % 60; Timerlbl.text = [NSString stringWithFormat:@"%02d",seconds]; if (seconds==0) { UIAlertView *pAlert = [[UIAlertView alloc]initWithTitle:@"Sorry!!" message:@"TimeOver" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:@"Cancel",nil]; [pAlert show]; [pAlert release]; } } ``` In Viewdidload i call it through timer.. ``` countDown=[NSTimer scheduledTimerWithTimeInterval:5.0 target:self selector:@selector(TimeOver) userInfo:nil repeats:YES]; ``` pleas any one guide me how can i do it in both minutes and seconds.