count up from 0.00 to 176.20 with NSTimer - ios

Question

I am working on an app and I want to animate the numbers in my app. I know I need to use an NSTimer. Just not sure how. For example I want the app to count up from 0.00 to 176.20 (self.total.text).
NSTimer *timer;
timer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:#selector(update) userInfo:nil repeats:YES];
- (void)update{
float currentTime = [self.total.text floatValue];
float newTime = currentTime + 0.1;
self.total.text = [NSString stringWithFormat:#"%f", newTime];
}

Answer 1

You need to decide at what increment you want to count. You want to stop at 176.20 so it seems like an increment of 0.1 seconds would be what you want. You need a variable to store the current position.
Obj-c///
const float limit = 176.2f
#property (nonatomic) float seconds;
#property (nonatomic, strong) NSTimer *updateTimer;
// Initialize
self.seconds = 0.0f;
self.updateTimer = [NStimer scheduledTimerWithTimeInterval:0.1f target:self selector:#selector(timerFired) userInfo:nil repeats:true];
Swift///
var seconds = 0.0
let limit = 176.2
let timer = NSTimer.scheduledTimerWithTimeInterval(0.1, target: self, selector: Selector("timerFired"), userInfo: nil, repeats: true)
Then you need to create a function which is used to update the label every time the timer fires and a function which schedules the timer.
Obj-c///
- (void)timerFired {
self.seconds += 0.1f;
self.label.text = [NSString stringWithFormat:#"%f", self.seconds];
if (self.seconds >= limit) {
[self.updateTimer invalidate];
}
}
Swift///
func timerFired() {
seconds += 0.1 //Increment the seconds
label.text = "\(seconds)" //Set the label
if (seconds >= limit) {
timer.invalidate()
}
}