How to load counter form current text in Objective C - ios

Question

I am new in iOS and I am facing problem to load counter from where it left count.
My code is like this
In
viewDidLoad()
{
if (!_currentTimeInSeconds) {
}_currentTimeInSeconds = 0 ;
if (!_myTimer) {
_myTimer = [self createTimer];
}
}
- (NSTimer *)createTimer {
return [NSTimer scheduledTimerWithTimeInterval:1.0
target:self
selector:#selector(timerTicked:)
userInfo:nil
repeats:YES];
}
- (NSString *)formattedTime:(int)totalSeconds
{
int seconds = totalSeconds % 60;
int minutes = (totalSeconds / 60) % 60;
int hours = totalSeconds / 3600;
return [NSString stringWithFormat:#"%02d:%02d:%02d",hours, minutes, seconds];
}
- (void)timerTicked:(NSTimer *)timer {
_currentTimeInSeconds++;
clockLabel.text = [self formattedTime:_currentTimeInSeconds];
}
-(void)updateTime
{
NSDate *date= [NSDate date];
NSDateFormatter *formatter1 = [[NSDateFormatter alloc]init]; //for hour and minute
formatter1.dateFormat = #"hh:mm:ss";// use any format
clockLabel.text = [formatter1 stringFromDate:date];
}
For Save
NSUserDefaults *defaults=[NSUserDefaults standardUserDefaults];
Timmer=clockLabel.text;
[defaults setValue:Timmer forKey:#"Timmer"];
[defaults synchronize];
For Retrive
NSUserDefaults *defaults=[NSUserDefaults standardUserDefaults];
Timmer=[defaults objectForKey:#"Timmer"];
clockLabel.text=Timmer;
This code is setting value from 0.
I need to set the value from where I left count.How to do this?
Thanks in Advance!

Answer 1

If you want to retrieve the count even after you quit and relaunch the app, then you should save/store the value into NSUserDefaults.

Answer 2

Just Set value in NSUserDefaults when you leave your controller . And this whole code tested and its work completely fine. see above commented video.
var _currentTimeInSeconds : Int = Int()
var _myTimer : Timer = Timer()
override func viewDidLoad() {
super.viewDidLoad()
_currentTimeInSeconds = 0 ;
_myTimer = self.createTimer()
}
func createTimer()-> Timer {
return Timer.scheduledTimer(timeInterval: 1.0, target: self, selector: #selector(timerTicked), userInfo: nil, repeats: true)
}
func timerTicked(_ timer: Timer) {
_currentTimeInSeconds += 1;
label.text = self.formattedTime(self._currentTimeInSeconds)
}
func formattedTime(_ totalSeconds: Int) -> String {
let seconds: Int = totalSeconds % 60
let minutes: Int = (totalSeconds / 60) % 60
let hours: Int = totalSeconds / 3600
return String(format: "%02d:%02d:%02d", hours, minutes, seconds)
}
func updateTime() {
let date = Date()
let formatter1 = DateFormatter()
//for hour and minute
formatter1.dateFormat = "hh:mm:ss"
// use any format
label.text = formatter1.string(from: date)
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(true)
print(_currentTimeInSeconds)
let defaults = UserDefaults.standard
defaults.setValue(_currentTimeInSeconds, forKey: "Timmer")
defaults.synchronize()
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
let defaults = UserDefaults.standard
if (defaults.object(forKey: "Timmer") != nil){
_currentTimeInSeconds = defaults.object(forKey: "Timmer") as! Int
print(_currentTimeInSeconds)
}
}
Happy Coding.

Answer 3

- (void)viewDidLoad {
timeSec=[[NSString stringWithFormat:#"%ld",(long)[[NSUserDefaults standardUserDefaults]integerForKey:#"timeSec"]] intValue];
timeMin=[[NSString stringWithFormat:#"%ld",(long)[[NSUserDefaults standardUserDefaults]integerForKey:#"timeMin"]] intValue];
[self StartTimer];
}
-(void) StartTimer
{
timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:#selector(timerTick:) userInfo:nil repeats:YES];
[[NSRunLoop currentRunLoop] addTimer:timer forMode:NSDefaultRunLoopMode];
self.lbl_timer.text=#"00:00";
}
- (void)timerTick:(NSTimer *)timer
{
timeSec++;
if (timeSec == 60)
{
timeSec = 0;
timeMin++;
}
self.lbl_timer.text= [NSString stringWithFormat:#"%02d:%02d", timeMin, timeSec];;
}
when you back to the screen that time add this code.like back button or close button action
[timer invalidate];
[[NSUserDefaults standardUserDefaults]setInteger:timeSec forKey:#"timeSec"];
[[NSUserDefaults standardUserDefaults]setInteger:timeMin forKey:#"timeMin"];