This is my code
- (void)updateCounterImage:(NSTimer *)theTimer
{
static int count = 0;
count += 1;
int crb = 6 - count;
UIImage *image = [UIImage imageNamed:[NSString stringWithFormat:#"ipad_game_timer_digit-%d.png", crb]];
if ( count == 6)
[timer release];
[countTime setImage:image];
}
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
[super viewDidLoad];
correctLevel.hidden = YES;
incorrectLevel.hidden = YES;
incorrectAnswer.hidden = YES;
correctAnswer.hidden = YES;
timer = [NSTimer scheduledTimerWithTimeInterval:1.0f
target:self
selector:#selector(updateCounterImage:)
userInfo:nil
repeats:NO];
}
#import <UIKit/UIKit.h>
#interface GameController : UIViewController
{
IBOutlet UIImageView *countTime;
NSTimer *timer;
}
#end
The problem is my imageView is not changing its image for countime.
You have set repeats to NO in the scheduledTimerWithTimeInterval which means the timer will only tick once.
You should write
timer = [NSTimer scheduledTimerWithTimeInterval:1.0f
target:self
selector:#selector(updateCounterImage:)
userInfo:nil
repeats:YES];
Related
I have the following problem: I have an NSArray that contains 5 objects. I want to display each item for 2 seconds using NSTimer, and release the timer after displaying the last item in the array.
Country = [NSArray arrayWithObjects:#"Aus",#"India",#"Pak",#"China",#"Japan", nil];
cntcount = [Country count];
NSLog(#"concount=%i", cntcount);
[NSTimer scheduledTimerWithTimeInterval:2.0 target:self selector:#selector(startTime) userInfo:nil repeats:YES];
But I'm not getting another step. What should I do in the starttime() function? Please help!
//
// AppViewController.m
// NSTimerExample
//
#import "AppViewController.h"
#interface AppViewController ()
#end
#implementation AppViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
Country = [NSArray arrayWithObjects:
#"Aus", #"India", #"Pak", #"China", #"Japan", nil];
tempValue = 0;
NSTimer *popupTimer = [NSTimer scheduledTimerWithTimeInterval:2.0
target:self
selector:#selector(startTime:)
userInfo:nil
repeats:YES];
NSRunLoop *runner = [NSRunLoop currentRunLoop];
[runner addTimer:popupTimer forMode:NSDefaultRunLoopMode];
}
- (void)startTime:(NSTimer *)theTimer {
int cntcount = [Country count];
if(tempValue < cntcount) {
NSString *objectName = [Country objectAtIndex:tempValue];
NSLog(#"objectName=%#", objectName);
tempValue++;
} else {
[theTimer invalidate];
theTimer = nil;
// or you can reset tempValue to 0.
}
}
After displaying the last item I want to release timer as it is no longer needed, but I'm getting and EXC_BAD_ACCESS exception.
Do like this,
In .h
int tempValue;
In .m
tempValue=0;
NSTimer *popupTimer = [NSTimer scheduledTimerWithTimeInterval:2.0 target:self selector:#selector(startTime:) userInfo:nil repeats:YES];;
NSRunLoop *runner = [NSRunLoop currentRunLoop];
[runner addTimer:popupTimer forMode: NSDefaultRunLoopMode];
In timer action method:
-(void)startTime:(NSTimer*)theTimer {
if(tempValue< Country.count) {
// Display array object eg: label.text=[Country objectAtIndex:tempValue];
tempValue++;
} else {
[theTimer invalidate];
theTimer=nil;
// or you can reset the tempValue into 0.
}
}
#import "AppViewController.h"
#interface AppViewController ()
#end
#implementation AppViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
Country=[[NSArray alloc]initWithObjects:#"Aus",#"India",#"Pak",#"China",#"Japan", nil];
tempValue=0;
NSTimer *popupTimer = [NSTimer scheduledTimerWithTimeInterval:2.0 target:self selector:#selector(startTime:) userInfo:nil repeats:YES];;
NSRunLoop *runner = [NSRunLoop currentRunLoop];
[runner addTimer:popupTimer forMode: NSDefaultRunLoopMode];
}
- (void)startTime:(NSTimer*)theTimer {
if(tempValue< Country.count) {
NSString *objectname=[Country objectAtIndex:tempValue];
NSLog(#"objectname is %#",objectname);
tempValue++;
} else {
[theTimer invalidate];
theTimer=nil;
// or you can reset the tempValue into 0.
}
}
- (void)viewDidUnload {
[super viewDidUnload];
// Release any retained subviews of the main view.
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}
#end
thanks to Tony and this code is working properly
I'm working on a buzzer app for IOS. When you click the buzzer, it buzzes, 30 seconds pops up, and counts down until after 1 and then buzzes and disappears. If, during the course of the 30-second countdown, someone wants to reset the buzzer (so that the timer goes off and disappears), they will just click the buzzer again.
I have three questions:
1. How do you start the app with the UILabel invisible and then shows up upon the first click?
2. How do you reset the buzzer by clicking it during the 30 second countdown?
3. Will reseting the buzzer fix the problem of the timer going down extremely quick when clicked multiple times?
viewcontrol.h
#import <UIKit/UIKit.h>
#import <AudioToolbox/AudioToolbox.h>
#interface ViewController : UIViewController {
IBOutlet UILabel *seconds;
NSTimer *timer;
int MainInt;
SystemSoundID buzzer;
}
- (IBAction)start:(id)sender;
- (void)countdown;
#end
ViewController.m
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
-(IBAction)start:(id)sender {
seconds.hidden = NO;
MainInt = 30;
timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:#selector(countdown) userInfo:nil repeats:YES];
AudioServicesPlaySystemSound(buzzer);
}
-(void)countdown {
MainInt -= 1;
seconds.text = [NSString stringWithFormat:#"%i", MainInt];
if (MainInt < 1) {
[timer invalidate];
timer = nil;
seconds.hidden = YES;
AudioServicesPlaySystemSound(buzzer);
}
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
NSURL *buttonURL = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:#"Buzz" ofType:#"wav"]];
AudioServicesCreateSystemSoundID((__bridge CFURLRef)buttonURL, &buzzer);
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#end
1) hiding the label on startup
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
//hide the label initially
[seconds setHidden:YES];
/// other code
then call [seconds setHidden:NO]; in start method
2) reset buzzer
-(IBAction)start:(id)sender {
seconds.hidden = NO;
MainInt = 30;
if(timer != nil)
{
//timer exist..stop previous timer first.
[timer invalidate];
}
timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:#selector(countdown) userInfo:nil repeats:YES];
AudioServicesPlaySystemSound(buzzer);
}
1) For the label becoming visible on a delay, initialize the label (in code or in IB) with seconds.alpha = 0.0. Then to make it visible...
NSTimeInterval delayUntilLabelIsVisible = 3.0; // 3 seconds
[UIView animateWithDuration:0.3
delay:delayUntilLabelIsVisible
options:UIViewAnimationCurveEaseIn
animations:^{seconds.alpha = 1.0;}
completion:^(BOOL finished) {}];
2,3) Your second and third questions can be solved with a line of code in the start method...
-(IBAction)start:(id)sender {
seconds.hidden = NO;
MainInt = 30;
// cancel the old timer before creating a new one
// (otherwise many timers will run at once, calling the buzzer method too often)
[timer invalidate];
timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:#selector(countdown) userInfo:nil repeats:YES];
AudioServicesPlaySystemSound(buzzer);
}
Have basically two view controllers oneviewcontroller and mainviewcontroller. In oneviewcontroller defined myTimer. In mainviewcontroller i m trying to pause and resume myTimer using UIButton. But getting message No Known class method for selector 'myTimer'
In OneViewController defined NSTimer as myTimer
#property (nonatomic, retain) NSTimer *myTimer;
#synthesize myTimer;
- (void)viewDidLoad {
[self myTimerMethod];
[super viewDidLoad];
}
- (void)myTimerMethod{
NSLog(#"myTimerMethod is Called");
myTimer = [NSTimer scheduledTimerWithTimeInterval:2.4
target:self
selector:#selector(updateView:)
userInfo:nil
repeats:YES];
}
- (void)updateView:(NSTimer *)theTimer
{
if (index < [textArray count])
{
self.textView.text = [self.textArray objectAtIndex:index];
self.imageView.image = [self.imagesArray objectAtIndex:index];
index++;
}else{
index = 0;
}
I m trying to pause and resume myTimer from mainviewcontroller
In mainviewcontroller.h
#class OneViewController;
#property (strong, nonatomic) OneViewController *oneviewcontroller;
#synthesize oneviewcontroller = _oneviewcontroller;
-(void)playpauseAction:(id)sender {
if([audioPlayer isPlaying])
{
[sender setImage:[UIImage imageNamed:#"music.png"] forState:UIControlStateNormal];
[audioPlayer pause];
[[OneViewController myTimer] invalidate]; **\\No Known class method for selector 'myTimer'**
}else{
[sender setImage:[UIImage imageNamed:#"audiostop.png"] forState:UIControlStateNormal];
[audioPlayer play];
[[OneViewController myTimer] fire]; **\\No Known class method for selector 'myTimer'**
if(isFirstTime == YES)
{
self.timer = [NSTimer scheduledTimerWithTimeInterval:06.0
target:self
selector:#selector(displayviewsAction:)
userInfo:nil
repeats:NO];
isFirstTime = NO; } } }
how can i fix this error.
Thanks for help.
Instead of [[OneViewController myTimer] invalidate]; use [self.oneviewcontroller.myTimer invalidate];
Also, in OneViewController implementation, instead of myTimer = [NSTimer scheduledTimerWithTimeInterval:..... use self.myTimer = [NSTimer scheduledTimerWithTimeInterval:.....
I want to set time count down like start with 60sec then elapsed 59,58,57 etc... this elapsed time show in bottom of the screen, How to set this?
Please help me
Thanks in Advance
You can use like:
Declare a NSTimer object on the #interface like NSTimer *aTimer;
-(void)viewDidLoad
{
aTimer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:#selector(elapsedTime) userInfo:nil repeats:YES];
}
-(void)elapsedTime
{
static int i = 60;
label.text = [NSString stringWithFormat:#"%d",i];
i--;
if(i<0)
{
[aTimer invalidate];
aTimer = nil;
}
}
Here label is a IBOutlet UILabel, that is set to interface.
You can do this with NSTimer see my example -
Declared
NSTimer *timer;
int count;
Globally in your ViewController.h class
Then you can start your count down in viewDidLoad: method.
- (void)viewDidLoad
{
//label is your **UILabel**
label.text = #"60";
count = 59;
timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:#selector(countDown) userInfo:nil repeats:YES];
}
-(void)countDown
{
if(count > 0)
{
label.text = [[NSNumber numberWithInt:count] stringValue];
count --;
}
else
{
[timer invalidate];
}
}
#interface ClassWithTimer : NSObject {
}
-(void) startTimer;
-(void) stopTimer;
#end
#implementation ClassWithTimer
NSTimer *up;
-(void) startTimer{
up = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:#selector(doSomething) userInfo:nil repeats:YES];
-(void) stopTimer{
[up invalidate];
}
- (void) doSomething{}
#end
then i do
- (IBAction)startTimers:(id)sender {
timer1 = [[ClassWithTimer alloc] initWithName:#"time1"];
timer2 = [[ClassWithTimer alloc] initWithName:#"time2"];
[timer1 startTimer];
[timer2 startTimer];
[timer1 stopTimer];
[timer2 stopTimer];
}
When i stop the timers i see that timer1 the same for timer2 and the invalidate method throw exception in [timer2 stopTimer] because this object invalidated at this moment.
I know that this is iOS policy but i can't find documentation for this.
Move
NSTimer *up;
into your .h file inside the interface block.
NSTimer needs to be an iVar, you are just declaring freely in the class allowing the two classes to share the same timer. Also you need to release the previous timer then retain the new one in startTimer.
#interface ClassWithTimer : NSObject {
NSTimer *up; //Declare iVar(instance variables) here
}
-(void) startTimer;
-(void) stopTimer;
#end
#implementation ClassWithTimer
-(void) startTimer{
[up invalidate];
[up release];
up = [[NSTimer scheduledTimerWithTimeInterval:1 target:self selector:#selector(doSomething) userInfo:nil repeats:YES] retain];
-(void) stopTimer{
[up invalidate]; //Do these same this line
[up release]; //and this line in your dealloc
up = nil;
}
- (void) doSomething{}
#end