Now that my project automatically reloads (with help form someone on this site :D ) how could i get another but to stop reloading?
this is what i have:
-(IBAction)SendGPSData:(id)sender {
NSURL *myURL =[NSURL URLWithString:#"http://www.google.co.uk"];//<<change this!!!
NSURLRequest *myRequest = [NSURLRequest requestWithURL:myURL];
[myWebView2 loadRequest:myRequest];
[myWebView2 reload];
[NSTimer scheduledTimerWithTimeInterval:2 target:self selector:#selector(WebViewLoad:) userInfo:nil repeats:YES];
}
-(IBAction)stop:(id)sender {
//what do i put here to stop it reloading?
}
-(void)WebViewLoad:(NSTimer *)theTimer
{
[myWebView2 reload];
}
dont like asking another question so soon but im a total beginner to Xcode so any help will be great :)
Iv tried the myWebView stop loading;
but the original seems to override this :(
You can stop like this:
-(IBAction)stop:(id)sender {
[webView stopLoading];
}
You also need to stop the timer. So you do:
NSTimer* reloadTimer; // Put this in your class.
reloadTimer = [NSTimer scheduledTimerWithTimeInterval:2 target:self selector:#selector(WebViewLoad:) userInfo:nil repeats:YES];
-(IBAction)stop:(id)sender
{
[reloadTimer invalidate];
reloadTimer = nil; // Prevents crash, when this method is called twice:
// reloadTimer is released when you call invalidate,
// so next time invalidate would be called on non-existing
// object -> crash.
[myWebView2 stopLoading];
}
It may make sense to put the code that starts/creates the timer in a separate method, so that you can use it restart the reloading again.
Related
I'm setting up a timer to fire at an interval of 13 mins. But the timer seems to be getting fired at irregular intervals. This is an intermittent issue. Some users reported the issue and I'm not able to reproduce the same.
- (void)resetIdleTimer
{
if (_idleTimer)
{
[_idleTimer invalidate];
[_idleTimer release];
_idleTimer = nil;
}
_idleTimer = [[NSTimer scheduledTimerWithTimeInterval:13*60.0
target:self
selector:#selector(idleTimerExceeded)
userInfo:nil
repeats:NO] retain];
}
- (void)idleTimerExceeded
{
// do some processing
[_idleTimer release];
_idleTimer = nil;
}
Timer will be reset (resetIdleTimer) depending on some conditions, but that's anyhow resets the timer with 13 mins.
When I looked into code, I can see only the issue that is not passing timer parameter to the selector. I'm not sure whether that's the reason for this issue or not ? Did anyone come across this kind of weird ness ? (Any how I will be updating the code to to have timer as an argument).
One user reported that its just happened after 4 mins itself.
Let confirm one thing,not passing timer parameter to the selector will not cause any issues.
Here is the updated code which works fine
#property(nonatomic,strong)NSTimer *myTimer;
or
#property(nonatomic,retain)NSTimer *myTimer;
Methods
- (void)resetIdleTimer
{
if ([self.myTimer isValid])
[self.myTimer invalidate];
self.myTimer = [NSTimer scheduledTimerWithTimeInterval:13*60.0
target:self
selector:#selector(idleTimerExceeded)
userInfo:nil
repeats:NO];
}
- (void)idleTimerExceeded
{
NSLog(#"tiggered");
}
i don't find any error in your code, the only idea about is that a user enter your class creating an instance, let's call it instance "A", then start the timer, then exit your class before 13 minutes, then enter again with a new instance "B", a new timer starts...
at this point user expects your timer methods fires after 13 minutes... but timer of "A" is still pending (because there may be an error in the way you close your class) and executes...
You may try to add some logs and try to do as i said, and check all logs (in particular if you enter the dealloc, and that the log in idleTimerExceeded print instances equals to the last instances printed in resetIdleTimer):
-(void)resetIdleTimer {
if (_idleTimer)
{
[_idleTimer invalidate];
[_idleTimer release];
_idleTimer = nil;
}
NSLog(#"...resetIdleTimer: instance: %p", self);
_idleTimer = [[NSTimer scheduledTimerWithTimeInterval:13*60.0
target:self
selector:#selector(idleTimerExceeded)
userInfo:nil
repeats:NO] retain];
NSLog(#"...resetIdleTimer: _idleTimer: %p", _idleTimer);
}
- (void)idleTimerExceeded
{
// do some processing
NSLog(#"...idleTimerExceeded: instance: %p", self);
NSLog(#"...idleTimerExceeded: _idleTimer: %p", _idleTimer);
[_idleTimer release];
_idleTimer = nil;
}
-(void) dealloc
{
NSLog(#"...dealloc: instance: %p", self);
[super dealloc];
}
just an idea... but you may have forgotten that timers retain the instance passed in target:parameter (you pass "self", so your class instance is retained), so a common error is to forget to close the timer when closing the class instance.
a correct way should be:
-a root class (AAA) instantiate your class (BBB) with timer
-BBB start its timer
-AAA wanna dealloc/resetIdleTimer class BBB: before to release it must stop/invalidate BBB.timer (if not timer retain BBB, and BBB won't be released until timer fires/executes its method)
so, if it's your case... add a method that could be called from class AAA that stop/invalidate the timer, something like:
-(void)stopTimer{
if (_idleTimer)
{
[_idleTimer invalidate];
[_idleTimer release];
_idleTimer = nil;
}
}
If you want your timer to fire in exact 13 minutes, maybe this will help:
https://stackoverflow.com/a/3519913/1226304
I've got a program in which I want to code a timer which checks wether the user is idle or not. For that I wrote following code:
if (!idleTimer) {
NSLog(#"make");
idleTimer=[[NSTimer alloc]initWithFireDate:[NSDate dateWithTimeIntervalSinceNow:10.0]interval:10 target:self selector:#selector(idleTimerExceeded) userInfo:nil repeats:NO];
NSLog(#"madetimer with: %f, %#", idleTimer.timeInterval, idleTimer.fireDate);
}else {
NSLog(#"no reset timer: %f", idleTimer.timeInterval);
if (fabs([idleTimer.fireDate timeIntervalSinceNow]) < 9) {
NSLog(#"reset");
[idleTimer setFireDate:[NSDate dateWithTimeIntervalSinceNow:10]];
}
}
But somehow my logs show that the interval is always 0.0000 . Which means that something is wrong here. Can anybody help me?
ive never seen a timer look so complicated. try this:
write a method that checks if the user is idle (lets say idleChecker)
then make the timer repeatable and calls that method idleChecker
[NSTimer scheduledTimerWithTimeInterval:.5 target:self selector:#selector(idleChecker) userInfo:nil repeats:YES];
remember to declare the idleChecker method in the .h file
take note if u want to stop the timer event then you need to maintain a reference to it
NSTimer aTimer = [NSTimer scheduledTimerWithTimeInterval:.5 target:self selector:#selector(idleChecker) userInfo:nil repeats:YES];
then to stop it
[aTimer invalidate];
as for checking if its running i would just stick a nslog message in there stating something like "check for idle user"
I'm looking for the cleanest way to have a countdown timer fire when a user hits the 'take picture' button. Is there any easy way to do this?
One solution I'm thinking of is to just have a label that updates every second, but is there a way to get it working like Photobooth?
Also, at the last second before the photo is about to be taken I'd like for an image to be displayed briefly while the image is being taken. How can I go about this?
Any help would be great, thanks!
- (IBAction)takePicture:(id)sender {
theTimer = [NSTimer scheduledTimerWithTimeInterval:0.5 target:self selector:#selector(updateLabel:) userInfo:nil repeats:NO];
}
- (void)updateLabel:(NSTimer *)timer {
_timeLabel.text = [NSString stringWithFormat:#"%d", time];
time = time - 1;
if (time == 0) {
[theTimer invalidate];
[_timeLabel performSelector:#selector(setText:) withObject:#"Photo taken!" afterDelay:1.0];
//Code for image shown at last second
} else {
theTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:#selector(updateLabel:) userInfo:nil repeats:NO];
}
}
Hope this helps ;)
I am new to iPhone,
What I want is that my timer call a function every second but for the very first time it must call the function at 2 second.
Any help will be really appreciated. Thanks
take a variable
BOOL isNotFirstTime;
And in the function that gets triggered after each 4 secs add the following code at the starting
-(void)AfterOneSecondsFuction
{
if(!isNotFirstTime)
{
isNotFirstTime=YES;
return;
}
//YOUR CODE HERE...
}
This is how you give a call to the function
NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:#selector(AfterOneSecondsFuction) userInfo:nil repeats:YES];
First schedule a timer and have a BOOL variable say isFirstTime set as YES;
[NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:#selector(doSomething) userInfo:nil repeats:YES];
and in
- (void)doSomething
{
if(isFirstTime)
{
isFirstTime = NO;
return;
}
// Do something
}
I'm struggling with this. I saw some code where you can do this :
- (void)startTimer {
pauseTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:#selector(doActions) userInfo:nil repeats:YES];
}
Then call it in doActions.
Problem is i want to call it while a button is being pressed, and do actions is an IBaction. I keep getting a sigAbrt.
Can someone give me some sample code where you cay change a label from 'on' to 'off' every 1 second while a button is being pressed?
EDIT
i mean if doActions looks like this
- (IBAction) doActions {
for(int j; j<100; j++){
theLabel.hidden != theLabel.hidden;
//Does invalidate timer go here?
}
}
It still isn't clear to me, what you're trying to accomplish: I would have found it much easier, if you simply had it written down in plain english, after all.
That said, here's what I think will get you where you want to go:
// Assuming ivars:
// NSTimer* toggleTimer
// NSUInteger toggleCount
- (void)toggleTimerFired:(NSTimer*)timer
{
if ( toggleCount++ >= 100 ) {
[self stopToggling:self];
return;
}
// do whatever you need to do a hundred times here
}
- (IBAction)stopToggling:(id)sender
{
[toggleTimer invalidate], toggleTimer = nil; // you don't want dangling pointers...
// perform any other needed house-keeping here
}
- (IBAction)startToggling:(id)sender
{
[self stopToggling:self]; // if `startToggling:` will NEVER be called when a timer exists, this line CAN be omitted.
toggleCount = 0;
toggleTimer = [NSTimer scheduledTimerWithTimeInterval:1. target:self selector:#selector(toggleTimerFired:) userInfo:nil repeats:YES];
}
Depending on what exactly you want to do, startToggling: needs to be sent on either touchUpInside or touchDown. In the second case, stopToggling: probably needs to be called on any touchUp... event of the button.
- (void)startTimer {
pauseTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:#selector(doActions) userInfo:nil repeats:YES];
}
- (void) doActions {
theLabel.hidden != theLabel.hidden;
}