I have a timer which i am using in my application..
In my application ,I have two views. On the first view i have added a button and a progress bar and i have used a timer for progress bar.
User can move to next view either on clicking the button or wait for progress bar to complete..
If the progress bar is completed the user will be drawn to next view..
Here, is my question How to stop timer which have no name like...
[NSTimer scheduledTimerWithTimeInterval:0.0005 target:self selector:#selector(onTimer) userInfo:nil repeats:YES];
Because of not stopping the timer in the first view if the user waits for progress bar to complete,the things in the next view will not work...
Store the returned NSTimer from scheduledWithTimeInterval::::: and later call invalidate on it to stop the timer.
NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:0.0005 target:self selector:#selector(onTimer) userInfo:nil repeats:YES];
// This will stop the tmer
[timer invalidate];
To stop timer you need to use
[timer invalidate];
Related
I have a lot of search about this and found many solution but no one works in my case.
i am using a NSTimer and activate it from a button click here its work fine . Now i invalidate timer on second button click and start it again on third button click but on third button click my timer not works. Can anyone tell me what is the wrong with me.
Code which i am using.
button1 click :
timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:#selector(updateCountdown) userInfo:nil repeats:YES];
button2 click :
if (timer != nil && [timer isValid])
{
[timer invalidate];
timer=nil;
}
button3 click :
timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:#selector(updateCountdown) userInfo:nil repeats:YES];
now on click on button3 timer not working.
by looking at your code . It must work . do couple of trials:
Check the your 3 rd button click event is being called or not .
Check if you are doing timer=nil , [timer invalidate]; somewhere else .
I am adding
[self performSelector:#selector(showLyrics) withObject:nil afterDelay:20];
but if user restart the song then the this selector should not get performed. So I just want to
know how I can cancel that. Because after 20 second it will get invoked but I don't want that, and reschedule
[self performSelector:#selector(showLyrics) withObject:nil afterDelay:20];
I'v so many
[self performSelector:#selector(showLyrics) withObject:nil afterDelay:2];
I want to cancel all those, which I've scheduled before.
[[NSRunLoop currentRunLoop] cancelPerformSelector:#selector(showLyrics)
target:self
argument:nil];
You can use NSTimer instead of performSelector:withObject:afterDelay:
NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:20 target:self selector:#selector(showLyrics) userInfo:nil repeats:NO];
To cancel:
[timer invalidate];
But you may want to invalidate before you start each time or keep timers in an array and iterate through them to cancel all of them.
Use an NSTimer and save a reference to it instead of performSelector. Afaik performSelector can't be cancelled. Edit: Apparently it can be cancelled, see omz's answer...
self.showLyricsTimer = [NSTimer scheduledTimerWithTimeInterval:20.0
target:self
selector:#selector(showLyrics)
userInfo:nil
repeats:NO];
To cancel the timer you use:
[self.showLyricsTimer invalidate];
But be careful to also invalidate the timer when your view disappears f.e. in the viewWillDisappear callback, since NSTimer retains it's target.
Cancels perform requests previously registered with performSelector:withObject:afterDelay:
+ (void)cancelPreviousPerformRequestsWithTarget:(id)aTarget selector:(SEL)aSelector object:(id)anArgument
It seems this is what you are looking for or what you were looking for~~
I have three tabbar items in one View. There is one NSTimer Schedule on Start Button Action in first tab item.When i press another tab item and come to the recent tab item(i.e tab item with NSTimer), it increases the seconds with 2. If i do the same for second time it increases the second with 3 and so on.I want seconds to be increased by 1.
This is the code i am using to schedule NSTimer
timer = [NSTimer scheduledTimerWithTimeInterval:1.0f target:self selector:#selector(timerTick:) userInfo:nil repeats:YES];
[[NSRunLoop currentRunLoop] addTimer:timer forMode:NSDefaultRunLoopMode];
I have tried to solve it using [timer invalidate]; but it is not giving me a proper result.
Thanks in advance.
in the - (void)viewWillAppear:(BOOL)animated
method make timer invalidate by [timer invalidate];
and again start it by :
timer = [NSTimer scheduledTimerWithTimeInterval:1.0f target:self selector:#selector(timerTick:) userInfo:nil repeats:YES];
I am new to Iphone programming I want to know about how to create a NSTimer in Xcode Iphonesdk. Can anyone suggest me?
NSTimer *timer = [NSTimer scheduleTimerWithTimeInterval:TIME_INTERVAL target:self selector:#selector(YOUR_METHOD_NAME) userInfo:nil repeats:YES/NO];
Hope this will help you........
Here is a code to add NSTimer..
1) in .h file
NSTimer *timer;
2) in .m file
timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:#selector(YOUR_METHOD_NAME) userInfo:nil repeats:YES];
Note:: so your method will continuously call after every 1 second.. and if you want to call the timer method only once set repeats:NO...
To Invalidate Timer
3) to invalidate the timer where you want..
[timer invalidate];
How can i start an NSTimer when a user clicks a button?
EDIT:i had the code working and everything, but i put the code to hide the button above the NSTimer code, and when i placed it below the NSTimer code it worked!
The line of code to start a timer is (read the docs here) :
[NSTimer scheduledTimerWithTimeInterval:1.0
target:self
selector:#selector(timerFired:)
userInfo:nil
repeats:nil];
This will call the method timerFired: after 1 second i.e.
- (void)timerFired:(NSTimer *)timer {
NSLog(#"timer : %# has gone off", timer);
}
To get this to trigger from a button, you need this method in your .h file :
- (IBAction)buttonPressed:(id)sender;
and in your .m file, detect the button press like this :
- (IBAction)buttonPressed:(id)sender {
NSLog(#"Button's been pressed!");
}
Then, in interface builder connect the button's 'Toiuch Up Inside' action to this method.
Schedule it in the IBAction of the button. Check NSTimer Class Reference to know how to use timers.
You have to insert the command of[NSTimer scheduledTimerWithTimeInterval:1.0
target:self
selector:#selector(timerFired:)
userInfo:nil
repeats:nil];
inside the buttonclick. Then only you could make the NStimer run after the button click (if you want to run the timer after the button click event )