This question already has answers here:
Closed 10 years ago.
Possible Duplicate:
NSTimer doesn't stop
In my application I am using NStimer to call an animation function every 3 seconds. I want to stop this timer and called another event while the timer is still running. Is this possible?
#interface
NSTimer *autoTimer;
#implementation
// Start timer
autoTimer = [NSTimer scheduledTimerWithTimeInterval:(3.0)
target:self
selector:#selector(autoTimerFired:)
userInfo:nil
repeats:YES];
// Stop timer:
[autoTimer invalidate];
autoTimer = nil;
First, you want to keep a pointer to the timer
self.packetTimer = [NSTimer timerWithTimeInterval:CONNECTION_TIMEOUT target:self selector:#selector(connectionTimeout:) userInfo:nil repeats:NO];
[[NSRunLoop currentRunLoop] addTimer:packetTimer forMode:NSDefaultRunLoopMode];
If somewhere else in your code you want to cancel it, just call:
[self.packetTimer invalidate];
self.packetTimer = nil;
Related
I want to my Webservice invoke once every 6 Hours.I am newer in iOS. Please help any help would be apperciated.I am stuck.
You can user NSTimer and schedule it for 6 hours
NSTimer *timer = nil;
timer = [NSTimer scheduledTimerWithTimeInterval:6*60*60 //6 hour
target:self
selector:#selector(performAction)
userInfo:nil
repeats:YES];
you can call using NSTimer. this is automatically called which time you set.
e.g.
NSTimer *timer= [NSTimer scheduledTimerWithTimeInterval:10.0(your time) target:self selector:#selector(someMethod) userInfo:nil repeats:YES];
-(void)someMethod
{
////API called here...
}
In ViewDidLoad
NSTimer *timer = [NSTimer timerWithTimeInterval:360.0 target:self selector:#selector(hideandview) userInfo:nil repeats:YES];
-(void)hideandview
{
////API called here...
}
You should save the last time in prefence (NSUserDefaults) when you make a call.
Whenever the app starts. Start timer and check current time with last saved time and get the difference.
This question already has answers here:
How do I use NSTimer?
(6 answers)
Closed 9 years ago.
I am making a Simon Says app to learn more about Objective C.
My SimonSaysViewController has 4 buttons. Their image needs to change accordingly when the pattern is being shown to the user.
A fixed interval timer will be absolutely fine.
I just cannot seem to find an example.
I basically would want a sort of setup like:
TimerTicked callback when I can do the image swapping logic.
Ideally, the TimerTicked method would be a method of my SimonSaysViewController.
How would this be done?
Thanks
NSTimer is your friend! Add an NSTimer property to your SimonSaysViewController.
#property (strong, nonatomic) NSTimer *tickTockTimer;
Depending on when you want the timer to start, you'll want to set up the timer then. Say you wanted the timer to start when the view first appears:
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
self.tickTockTimer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:#selector(timerFired:) userInfo:nil repeats:YES];
}
Then implement the timerFired method and do what you need there.
- (void)timerFired:(NSTimer *)timer {
//change the image.
}
Don't forget to invalidate the timer when you are done.
- (void) viewWillDisappear:(BOOL)animated {
[super viewWillDisappear:animated];
[self.timer invalidate];
self.timer = nil;
}
This kind of thing usually works for me
NSDate *fireDate = [NSDate dateWithTimeIntervalSinceNow:2.0]; // 2 sec from now
NSTimer *self.timer = [[NSTimer alloc] initWithFireDate:fireDate interval:5 target:self selector:#selector(timerDidTick) userInfo:nil repeats:YES]; // fire 5 sec apart
NSRunLoop *runLoop = [NSRunLoop currentRunLoop];
[runLoop addTimer:self.timer forMode:NSDefaultRunLoopMode];
I've created a simple button game that gives the user a point with every tap of the button. The button randomly appears on screen every 1.5 seconds. I want the game to end after 30 seconds or after 20 random button pop ups. I've been using the code below to have the button randomly pop-up on the screen:
timer = [NSTimer scheduledTimerWithTimeInterval: 1.5 target:self
selector:#selector(moveButton:)
userInfo:nil
repeats:YES];
I've declared the timer in the header file:
NSTimer *timer;
#property (nonatomic, retain) NSTimer *timer;
I've read Apple Docs on Using Timers but fail to fully understand it. I thought maybe I could use:
- (void)countedTimerFireMethod:(NSTimer *)timer{
count ++;
if(count > 20){
[self.timer invalidate];
self.timer = nil;
But it does not work properly. What am I doing wrong? I'm new to objective-C so I'm not that familiar with how things work.
The problem is on your timer method you are passing moveButton method but in below method where you are stopping the timer that method name is different so try this:-
self.timer = [NSTimer
scheduledTimerWithTimeInterval: 1.5 target:self
selector:#selector(moveButton:)
userInfo:nil
repeats:YES];
//just change the method name below
- (void)moveButton:(NSTimer *)timer{
count ++;
if(count > 20){
[self.timer invalidate];
self.timer = nil;}
If you are using new version of Xcode then you don not need to declare
NSTimer *timer;
and when scheduling a timer you can use
self.timer = [NSTimer scheduledTimerWithTimeInterval: 1.5 target:self
selector:#selector(moveButton:)
userInfo:nil
repeats:YES]
instead of
timer = [NSTimer scheduledTimerWithTimeInterval: 1.5 target:self
selector:#selector(moveButton:)
userInfo:nil
repeats:YES]
You are using correct method to stop the timer i.e invalidate
You can also refer the link for more clarification.
Please let me know if you solve this problem through the above code.
This question already has answers here:
NSTimer timerWithTimeInterval: not working
(4 answers)
Closed 8 years ago.
This is my exact code, and it doesn't seem to be working. Can you tell me what I am doing wrong? Note that refreshTimer was already declared in the private interface.
-(void)viewDidLoad {
refreshTimer = [NSTimer timerWithTimeInterval:1 target:self selector:#selector(timerTest) userInfo:nil repeats:YES];
}
-(void)timerTest {
NSLog(#"Timer Worked");
}
Give scheduledTimerWithTimeInterval a try:
NSTimer *myTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:#selector(myMethod) userInfo:nil repeats:YES];
Quoting: NSTimer timerWithTimeInterval: not working
scheduledTimerWithTimeInterval:invocation:repeats: and scheduledTimerWithTimeInterval:target:selector:userInfo:repeats: create timers that get automatically added to an NSRunLoop, meaning that you don't have to add them yourself. Having them added to an NSRunLoop is what causes them to fire.
There is two-option.
If using a timerWithTimeInterval
use a following like it.
refreshTimer = [NSTimer timerWithTimeInterval:1.0f target:self selector:#selector(timerHandler) userInfo:nil repeats:YES];
[[NSRunLoop currentRunLoop] addTimer:refreshTimer forMode:NSRunLoopCommonModes];
also mode is two-option. NSDefaultRunLoopMode vs NSRunLoopCommonModes
more Information. refer a this documentation: RunLoopManagement
If using a scheduledTimerWithTimeInterval
use a following like it.
refreshTimer = [NSTimer scheduledTimerWithTimeInterval:1.0f target:self selector:#selector(timerHandler) userInfo:nil repeats:YES];
scheduled timers are automatically added to the run loop.
more information. refer a this documentation: Timer Programming Topics
In summary
The "timerWithTimeInterval" you have to remember
to add the timer to the run loop that you want to add on.
The "scheduledTimerWithTimeInterval" default auto creates a timer that runs in
the current loop.
This question already has answers here:
Closed 10 years ago.
Possible Duplicate:
NSTimer doesn't stop
I have this code:
[NSTimer scheduledTimerWithTimeInterval:110.0
target:self
selector:#selector(targetMethod:)
userInfo:nil
repeats:YES];
- (void) targetMethod:(NSTimer) timer{
NSLog(#"Hello World");}
in targetMethod I can stop timer with [timer invalidate], but out of this method, How can I stop targetMethod?
You can keep your NSTimer in a variable and stop the timer using the invalidate method. Like the following:
NSTimer * myTimer = [NSTimer scheduledTimerWithTimeInterval:110.0
target:self
selector:#selector(targetMethod:)
userInfo:nil
repeats:YES];
[myTimer invalidate];
One way to do it is to create NSTimer *timer; as a global variable so you can have a handle to the timer. Some thing likes this:
NSTimer *timer; //global var
timer = [NSTimer scheduledTimerWithTimeInterval:110.0
target:self
selector:#selector(targetMethod:)
userInfo:nil
repeats:YES];
To stop timer somewhere in the same class:
[timer invalidate];