Countdown timer using NSTimer in "0:00" format
- by Joey Pennacchio
I have been researching for days on how to do this and nobody has an answer.
I am creating an app with 5 timers on the same view.
I need to create a timer that counts down from "15:00" (minutes and seconds), and, another that counts down from "2:58" (minutes and seconds). The 15 minute timer should not repeat, but it should stop all other timers when it reaches "00:00." The "2:58" timer should repeat until the "15:00" or "Game Clock" reaches 0. Right now, I have scrapped almost all of my code and I'm working on the "2:58" repeating timer, or "rocketTimer."
Does anyone know how to do this?
Here is my code:
#import <UIKit/UIKit.h>
@interface FirstViewController : UIViewController {
//Rocket Timer
int totalSeconds;
bool timerActive;
NSTimer *rocketTimer;
IBOutlet UILabel *rocketCount;
int newTotalSeconds;
int totalRocketSeconds;
int minutes;
int seconds;
}
- (IBAction)Start;
@end
and my .m
#import "FirstViewController.h"
@implementation FirstViewController
- (NSString *)timeFormatted:(int)newTotalSeconds
{
int seconds = totalSeconds % 60;
int minutes = (totalSeconds / 60) % 60;
return [NSString stringWithFormat:@"%i:%02d"], minutes, seconds;
}
-(IBAction)Start {
newTotalSeconds = 178; //for 2:58
newTotalSeconds = newTotalSeconds-1;
rocketCount.text = [self timeFormatted:newTotalSeconds];
if(timerActive == NO){
timerActive = YES;
newTotalSeconds = 178;
[rocketTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(timerLoop) userInfo:nil repeats:YES];
}
else{
timerActive = NO;
[rocketTimer invalidate];
rocketTimer = nil;
}
}
-(void)timerLoop:(id)sender {
totalSeconds = totalSeconds-1;
rocketCount.text = [self timeFormatted:totalSeconds];
}
- (void)dealloc
{
[super dealloc];
[rocketTimer release];
}
- (void)didReceiveMemoryWarning
{
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
timerActive = NO;
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
@end
