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.
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.
Im making an iphone game that uses NStimer for movement. I found out that there is a bug that makes the timers stack some times, but i havnt found out what causes is. Is there any way to see how many timers are allocated and is there any way to prevent it by doing something like this:
If(myTimer.numberOfAllocatedTimers == 0) {
myTimer = [NSTimer scheduledTimerWithTimeInterval:0.25 target:self selector:#selector(updateme) userInfo:nil repeats:YES];
}
Try this:
// use this to start timer
myTimer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:#selector(doSthing) userInfo:nil repeats:YES];
// use this to stop timer
if (myTimer) {
[myTimer invalidate];
myTimer = nil;
}
A little more context on where this code is being used would be helpful.
However, I'll try to explain why it's happening anyway.
Every time you use [NSTimer scheduledTimerWithTimeInterval...], a new timer is created, and will start repeating. If your code creates a timer inside the callback method, see example below, you'll stack timers.
- (void)updateme {
if ([NSTimer scheduledTimerWithTimeInterval:0.25 target:self selector:#selector(updateme) userInfo:nil repeats:YES]) {
// This creates stacked timers!
}
}
Here's how you should do it:
#property (nonatomic, strong) NSTimer *myTimer;
...
self.myTimer = [NSTimer scheduledTimerWithTimeInterval:0.25 target:self selector:#selector(updateme:) userInfo:nil repeats:YES];
...
- (void)updateme:(NSTimer *)timer {
if (timer == self.myTimer) {
// Do something because the timers are equal
}
}
I have a void function which just have NSLog(#"Call me"); in its body.
I call it in my view in every ten seconds by using
NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:10 target:self selector:#selector(yourMethod) userInfo:nil repeats:YES];
But I want it to stop it after 5 iterations. However it goes to infinity. How can I do that?
1) Keep a global variable, that increments from 0 to 5.
int i = 0;
2) Incement this variable inside your timer function..
-(void) yourFunction:(NSTimer*)timer{
//do your action
i++;
if(i == 5){
[timer invalidate];
}
}
3) When creating timer
NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:10
target:self
selector:#selector(yourMethod:) // <== see the ':', indicates your function takes an argument
userInfo:nil
repeats:YES];
You should take one counter, increment it every time when your method get called, count for 5 and then invalidate your timer using below code.
[timer invalidate];
To destroy the timer from the current loop, you should call [timer invalidate];
To determine five occurrences, you need to maintain a variable and increment its count each time. If it is equal to 5, call invalidate method.
First of all you need to declare an int and declare your NSTimer *timer, so we can stop it:
#interface AppDelegate : UIViewController {
int myInt;
NSTimer *timer;
}
To start the NSTimer you'll need to change just a bit of the code:
timer = [NSTimer scheduledTimerWithTimeInterval:10 target:self selector:#selector(yourMethod) userInfo:nil repeats:YES];
Inside your void function you can make the verification to check if the code's running after 5 iterations:
- (void)myVoid{
NSLog(#"Call Me");
if (myInt == 5) {
[timer invalidate];
timer = nil;
}
myInt++;
}
I am Developing an ios app for audio player.
Here now i have to move one slider that represents the current playing track of the song
For Example my song duration is 6sec now i have to move the slider from x point =0 to x=480 by the time audio playing should Finnish it paying one loop.
I am moving the based up Nstimer. now i required the nstime interval for nstimer to move the slider correctly to end that is x=480.
myTimer = [NSTimer scheduledTimerWithTimeInterval:timeinterval target:self selector:#selector(updatplayer) userInfo:nil repeats:YES];
here i need this timeinterval value
can any one help me ?
You can use your timer as:
myTimer = [NSTimer scheduledTimerWithTimeInterval:0.5 target:self selector:#selector(updatplayer) userInfo:nil repeats:YES];
- (void)updatplayer {
long currentPlaybackTime = moviePlayer.currentPlaybackTime;
playSlider.value = currentPlaybackTime / moviePlayer.duration;
}
You can set your time interval as a class property and access it from there. In example:
#interface YourClass ()
#property (nonatomic, assign) NSTimeInterval myTimeInterval);
#end
#implementation YourClass
- (void)methodWithYourTimerInIt {
// ... Do stuff
self.myTimeInterval = 6.0;
myTimer = [NSTimer scheduledTimerWithTimeInterval:self.myTimeInterval target:self selector:#selector(updatePlayer) userInfo:nil repeats:YES];
}
- (void)updatePlayer {
NSLog(#"My time interval is: %f", self.myTimeInterval);
}
#end
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];