I want to update text for label frequently but it seems not working.
for (int i = 0; i <100; i++)
{
mylabel.text =[NSString stringWithFormat:#"%d", i];
}
Does anyone suggest for me an idea ? I thought. Maybe, we should update text label in multiple threads.
Watch is best example hope it will help you....
int second,minute; //set second = 0 and minute = 0
[NSTimer scheduledTimerWithTimeInterval:1.0f target:self selector:#selector(updateCounter:) userInfo:nil repeats:YES];
- (void)updateCounter:(NSTimer *)theTimer {
second++;
if(second < 60)
{
if (second < 10)
{
timerLbl.text = [NSString stringWithFormat:#"00:0%d", second];
}
else
{
timerLbl.text = [NSString stringWithFormat:#"00:%d",second];
}
}
else
{
minute = second / 60;
int sec = second % 60;
if (minute < 10 && sec < 10)
{
timerLbl.text = [NSString stringWithFormat:#"0%d:0%d", minute, sec];
}
if(minute < 10 && sec >= 10)
{
timerLbl.text = [NSString stringWithFormat:#"0%d:%d", minute, sec];
}
if (minute >= 10 && sec < 10)
{
timerLbl.text = [NSString stringWithFormat:#"%d:0%d", minute, sec];
}
if(minute >= 10 && sec >= 10)
{
timerLbl.text = [NSString stringWithFormat:#"%d:%d", minute, sec];
}
}
}
Add below code in viewDidLoad
self.timer = [NSTimer scheduledTimerWithTimeInterval:0.5f
target:self
selector:#selector(showTime)
userInfo:NULL
repeats:YES];
- (void)showTime
{
NSDate *now=[NSDate date];
NSDateFormatter *dateFormatter=[NSDateFormatter new];
[dateFormatter setDateFormat:#"HH:mm:ss"];
timeLabel.text=[dateFormatter stringFromDate:now];
}
Hope this answer will help you....
use NSTimer for the regular interval and call the method where the lable is printed let suppose
[NSTimer scheduledTimerWithTimeInterval:2.0
target:self
selector:#selector(targetMethod:)
userInfo:nil
repeats:Yes];
in the target method print the label on text
-(void)targetMethod:(NSTimer *)timer{
NSDate* date = [NSDate date];
NSDateFormatter* formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:#" HH:MM:SS"];
NSString* str = [formatter stringFromDate:date];
label.text = str;
}
try this it will work surely
Related
This question already has answers here:
iOS Format String into minutes and seconds
(7 answers)
Closed 8 years ago.
I am trying to get a timer to show the counter like this "00:00:00". Here is my current code. I have been trying to get it to work using the stringWithFormat which should be easy but I guess I will have to set up the formats separately. Do you guys have any idea on how to do this?
- (void)TimerCount {
CountNumber = CountNumber + 1;
TimerDisplay.text = [NSString stringWithFormat:#"Hour: %0*i", length, hour];
}
- (void)timerCount {
{
CountNumber = CountNumber + 1;
NSInteger seconds = CountNumber % 60;
NSInteger minutes = (CountNumber / 60) % 60;
NSInteger hours = (CountNumber / 3600);
TimerDisplay.text = [NSString stringWithFormat:#"%i:%02i:%02i", hours, minutes, seconds];
}
Try the above code.
And configure this method to be fired every second.
In viewDidLoad
NSTimer *counterTimer = [NSTimer scheduledTimerWithTimeInterval:1.0
target:self
selector:#selector(timerCount)
userInfo:nil
repeats:YES];
[[NSRunLoop mainRunLoop] addTimer: counterTimer forMode:NSRunLoopCommonModes];
And keep the counterTimer as an iVar to keep it alive until the VC is dealloced, if you are using ARC.
- (void)TimerCount
{
CountNumber++;
NSString *time = [[NSString alloc] init];
NSUInteger seconds = CountNumber;
NSUInteger minutes = 0;
NSUInteger hours = 0;
if (seconds > 59) {
seconds -= 60;
minutes++;
if (seconds < 10) {
time = [NSString stringWithFormat:#":0%i",seconds];
} else time = [NSString stringWithFormat:#":%i",seconds];
}
if (minutes > 59) {
minutes -= 60;
hours++;
if (minutes < 10) {
time = [NSString stringWithFormat:#":0%i%#",minutes,time];
} else time = [NSString stringWithFormat:#":%i%#",minutes,time];
}
if (hours < 10) {
time = [NSString stringWithFormat:#"0%i%#",hours,time];
} else time = [NSString stringWithFormat:#"%i%#",hours,time];
}
NSString *time is the time.
Also NSTimer to call this method every second:
NSTimer *counterTimer = [NSTimer scheduledTimerWithTimeInterval:1.0
target:self
selector:#selector(timerCount)
userInfo:nil
repeats:YES];
How can I show a countdown in HH:mm:ss format from NOW to a desired NSDate that will happen in the future?
Start at the documentation.
NSDate *future = // whatever
[NSTimer scheduledTimerWithTimeInterval:1.0f target:self selector:#selector(updateCounter:) userInfo:nil repeats:YES];
- (void)updateCounter:(NSTimer *)tmr
{
NSTimeInterval iv = [future timeIntervalSinceNow];
int h = iv / 3600;
int m = (iv - h * 3600) / 60;
int s = iv - h * 3600 - m * 60;
aUILabel.text = [NSString stringWithFormat:#"%02d:%02d:%02d", h, m, s];
if (h + m + s <= 0) {
[tmr invalidate];
}
}
You have to use a timer for ticking the date.
Store a future date, and keep on substracting future date - [nsdate today]...
Calculate the time in seconds and calculate it into Hours, minutes, seconds...
//Make two properties NSDate *nowDate, *futureDate
futureDate=...;
nowDate=[NSDate date];
long elapsedSeconds=[nowDate timeIntervalSinceDate:futureDate];
NSLog(#"Elaped seconds:%ld seconds",elapsedSeconds);
NSInteger seconds = elapsedSeconds % 60;
NSInteger minutes = (elapsedSeconds / 60) % 60;
NSInteger hours = elapsedSeconds / (60 * 60);
NSString *result= [NSString stringWithFormat:#"%02ld:%02ld:%02ld", hours, minutes, seconds];
This will come handy for you...kindly check the project...
Give this code a shot:
NSTimer* timer= [NSTimer scheduledTimerWithInterval: [self.futureDate timeIntervalSinceNow] target: self selector: #selector(countdown:) userInfo: nil, repeats: YES];
The countdown: method:
- (void) countdown: (NSTimer*) timer
{
if( [self.futureDate timeIntervalSinceNow] <= 0)
{
[timer invalidate];
return;
}
NSDateComponents* comp= [ [NSCalendar currentCalendar] components: NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit startingDate: [NSDate date] toDate: self.futureDate options: 0];
NSLog(#"%lu:%lu:%lu", comp.hour,comp.minute.comp.second);
}
Here is my situation: I am making a countdown app which works fine but does not appear to stop when I call [stopWatchTimer invalidate];, and I have no idea why. Here is my code:
- (IBAction)btnStartPressed:(id)sender {
//Start countdown with the time on the Date Picker.
timeLeft = [pkrTime countDownDuration];
[self currentCount];
lblTimer.text = time; //sets the label to the time set above
pkrTime.hidden = YES;
btnStart.hidden = YES;
btnStop.hidden = NO;
//Fire this timer every second.
stopWatchTimer = [NSTimer scheduledTimerWithTimeInterval:1.0/1.0
target:self
selector:#selector(reduceTimeLeft:)
userInfo:nil
repeats:YES];
}
- (void)reduceTimeLeft:(NSTimer *)timer {
//Countown timeleft by a second each time this function is called
timeLeft--;
// Get the system calendar
NSCalendar *sysCalendar = [NSCalendar currentCalendar];
// Create the NSDates
NSDate *date1 = [[NSDate alloc] init];
NSDate *date2 = [[NSDate alloc] initWithTimeInterval:timeLeft sinceDate:date1];
// Get conversion to months, days, hours, minutes
unsigned int unitFlags = NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;
NSDateComponents *conversionInfo = [sysCalendar components:unitFlags fromDate:date1 toDate:date2 options:0];
int sec = [conversionInfo second];
int min = [conversionInfo minute];
int hour = [conversionInfo hour];
NSString *seconds = [NSString stringWithFormat:#"%d",sec];
NSString *minutes = [NSString stringWithFormat:#"%d",min];
if (sec <= 9)
seconds = [NSString stringWithFormat:#"0%d", sec];
if (min <= 9)
minutes = [NSString stringWithFormat:#"0%d", min];
if ([conversionInfo hour] == 0)
time = [NSString stringWithFormat:#"%#:%#", minutes, seconds];
else
time = [NSString stringWithFormat:#"%d:%#:%#", hour, minutes, seconds];
lblTimer.text = time; //sets the label to the time set above
NSLog(#"%d", timeLeft);
if (timeLeft == 0) {
[self timerDone];
[stopWatchTimer invalidate];
stopWatchTimer = nil;
}
}
-(void)timerDone {
pkrTime.hidden = NO;
btnStart.hidden = NO;
btnStop.hidden = YES;
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Timer Done" message:nil delegate:self cancelButtonTitle:nil otherButtonTitles:#"Ok", nil];
[alert show];
[self playAlert];
}
Please let me know what the problem is... I cannot find a problem with my code anywhere!
In your btnStartPressed: method, you have nothing preventing a second NSTimer from being allocated and assigned to stopWatchTimer. If you press the button twice, you'll end up with two timers, but only one will ever be invalidated.
Add something like:
if (stopWatchTimer) return;
To the beginning of btnStartPressed:. If that doesn't fix the problem, then there isn't enough context to know for sure what is going on beyond conjecturing that timeLeft is zero?
What Nate said, but here is another explanation.
Imagine if you do this (where stopWatchTimer is a global or instance variable, doesn't matter):
stopWatchTimer = [NSTimer scheduledTimerWithTimeInterval:....];
Now, do this:
stopWatchTimer = nil;
[stopWatchTimer invalidate];
The timer won't invalidate, but it'll still fire. stopWatchTimer is a reference to the object. It isn't the object itself. Thus, when you assign a second timer to stopWatchTimer, you are overwriting the reference to the first timer, but that timer is still going to fire!
i create a countdown timer that go from 10 to 0. i create a uilabel that shows the counter in seconds. now i want the label to show the counter minutes and second, like that: 00:00.
how can i do that?
here is my countdowncode:
-(void)countdown
{
countdownCounter -= 1;
countdown.text = [NSString stringWithFormat:#"%i", countdownCounter];
}
-(IBAction)strat:(id)sender
{
countdownCounter = 10;
countdownTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:#selector(countdown) userInfo:nil repeats:YES];
}
}
thanks!
This can be done using one time, and one label. Try using the following code:
int seconds = [countDown.text intValue] % 60;
int minutes = ([countDown.text intValue] / 60) % 60;
countDown.text = [NSString stringWithFormat:#"%2d:%02d", minutes, seconds];
Do it exactly the same way, just add another timer.
countdownTimer2 = [NSTimer scheduledTimerWithTimeInterval:60.0 target:self selector:#selector(countdown2) userInfo:nil repeats:YES];
-(void)countdown2
{
countdownCounterMinutes -= 1;
}
and change countdown to
-(void)countdown
{
countdownCounter -= 1;
countdown.text = [NSString stringWithFormat:#"%i%i", countdownCounterMinutes, countdownCounter];
}
for anyone who what the answer in the end i do it this way:
-(IBAction)start
{
timer = [NSTimer scheduledTimerWithTimeInterval:.01 target:self selector:#selector(updateTimer:) userInfo:nil repeats:YES];
}
-(void)updateTimer:(NSTimer *)timer {
currentTime -= 10 ;
[self populateLabelwithTime:currentTime];
if(currentTime <=0)
[timer invalidate];
}
- (void)populateLabelwithTime:(int)milliseconds {
seconds = milliseconds/1000;
minutes = seconds / 60;
hours = minutes / 60;
seconds -= minutes * 60;
minutes -= hours * 60;
NSString * result1 = [NSString stringWithFormat:#"%#%02d:%02d:%02d:%02d", (milliseconds<0?#"-":#""), hours, minutes, seconds,milliseconds%1000];
result.text = result1;
}
in viewDidLoad i set currentTime for the countdown time in milliseconds.
hope you understand...
I formatted the numbers (from float)with mins and seconds
it this way, thanks your answers helped. (hope this helps another)
- (void)ticTimer
{
self.current -= self.updateSpeed;
CGFloat progress = self.current / self.max;
[self populateLabelwithTimeFormatted:self.current];
/// TimeLabelNode.text = [NSString stringWithFormat:#"%f", progress];
// * Time is over
if (self.current <= self.min) {
[self stop];
_TimeLabelNode.text= #"time up!";
}
}
- (void)populateLabelwithTimeFormatted:(float)time {
//convert float into mins and seconds format
int mytime = (int) _current;
int seconds = mytime%60;
int minutes = mytime / 60 % 60;
NSString * result1 = [NSString stringWithFormat:#"%2d:%02d", minutes, seconds];
_TimeLabelNode.text = result1;
}
I am designing a timer that I want to be able to pause and continue from the same place. I tried doing it but the code wouldn't work for me. Here is my code:
.m file:
-(IBAction)buttonPause:(id)sender {
NSString *dateString = timer.text;
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:#"HH:mm:ss.SS"];
NSDate *dateFromString = [[NSDate alloc] init];
dateFromString = [dateFormatter dateFromString:dateString];
dateFromString = startDate;
}
- (IBAction)buttonStart:(id)sender {
startDate = [NSDate date];
stopWatchTimer = [NSTimer scheduledTimerWithTimeInterval:1.0/100.0
target:self
selector:#selector(updateTimer)
userInfo:nil
repeats:YES];
}
- (void)updateTimer{
NSDate *currentDate = [NSDate date];
NSTimeInterval timeInterval = [currentDate timeIntervalSinceDate:startDate];
NSDate *timerDate = [NSDate dateWithTimeIntervalSince1970:timeInterval];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:#"HH:mm:ss.SS"];
[dateFormatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0.0]];
NSString *timeString = [dateFormatter stringFromDate:timerDate];
timer.text = timeString;
}
My problem appears to lie in the buttonPause method. What am I doing wrong or am not doing? Thank you in advanced.
You can use NSTimeInterval instead of timer. I have a functional code to pause and stop the timer.
#interface PerformBenchmarksViewController () {
int currMinute;
int currSecond;
int currHour;
int mins;
NSDate *startDate;
NSTimeInterval secondsAlreadyRun;
}
#end
- (void)viewDidLoad
{
[super viewDidLoad];
running = false;
}
- (IBAction)StartTimer:(id)sender {
if(running == false) {
//start timer
running = true;
startDate = [[NSDate alloc] init];
startTime = [NSDate timeIntervalSinceReferenceDate];
[sender setTitle:#"Pause" forState:UIControlStateNormal];
[self updateTime];
}
else {
//pause timer
secondsAlreadyRun += [[NSDate date] timeIntervalSinceDate:startDate];
startDate = [[NSDate alloc] init];
[sender setTitle:#"Start" forState:UIControlStateNormal];
running = false;
}
}
- (void)updateTime {
if(running == false) return;
//calculate elapsed time
NSTimeInterval currentTime = [NSDate timeIntervalSinceReferenceDate];
NSTimeInterval elapsed = secondsAlreadyRun + currentTime - startTime;
// extract out the minutes, seconds, and hours of seconds from elapsed time:
int hours = (int)(mins / 60.0);
elapsed -= hours * 60;
mins = (int)(elapsed / 60.0);
elapsed -= mins * 60;
int secs = (int) (elapsed);
//update our lable using the format of 00:00:00
timerLabel.text = [NSString stringWithFormat:#"%02u:%02u:%02u", hours, mins, secs];
//call uptadeTime again after 1 second
[self performSelector:#selector(updateTime) withObject:self afterDelay:1];
}
Hope this will help. Thanks