Adding Stop and Reset buttons to NSTimer [duplicate] - objective-c

Question

This question already has answers here:
Stop and Reset NSTimer
(2 answers)
Closed 9 years ago.
I have created a NSTimer that simply times minutes and I am wishing to add a stop and reset button to it. So far my code looks like this:
#implementation TimeController
int timeTick = 0;
NSTimer *timer;
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
labelTime.text = #"0";
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)startTimer:(id)sender {
[timer invalidate];
timer= [NSTimer scheduledTimerWithTimeInterval:60.0 target:(self) selector:(#selector(tick)) userInfo:(nil) repeats:(YES)];
}
-(void)tick{
timeTick++;
NSString *timeString = [[NSString alloc] initWithFormat:#"%d", timeTick];
labelTime.text = timeString;
}
#end
Thanks in advance!

Answer 1

Your timeTick and timer are actually globals which is probably not what you intended. You should probably declare them as instance variables. This will allow you to have multiple instances of your TimeController and have them all count independently.
Then your code may look something like this
#interface TimeController ()
#property (nonatomic, assign) NSInteger minutes;
#property (nonatomic, strong) NSTimer *timer;
#end
#implementation TimeController
- (void)viewDidLoad
{
[super viewDidLoad];
[self updateMinuteLabel];
}
- (IBAction)startTimer
{
[self.timer invalidate];
self.timer = [NSTimer scheduledTimerWithTimeInterval:60.0
target:self
selector:#selector(tick)
userInfo:nil
repeats:YES];
}
- (IBAction)stopTimer
{
[self.timer invalidate];
}
- (IBAction)resetTimer
{
self.minutes = 0;
[self updateMinuteLabel];
}
- (void)tick
{
self.minutes += 1;
[self updateMinuteLabel];
}
- (void)updateMinuteLabel
{
self.minuteLabel.text = [NSString stringWithFormat:#"%d", self.minutes];
}
#end