CustomChronometer to ios

CustomChronometer.h

//  	CustomChronometer Copyright (C) 2012 Ademar Alves de Oliveira and jurema.la
//
//		This program is free software: you can redistribute it and/or modify
//		it under the terms of the GNU General Public License as published by
//		the Free Software Foundation, either version 3 of the License, or
//		(at your option) any later version.
//
//		This program is distributed in the hope that it will be useful,
//		but WITHOUT ANY WARRANTY; without even the implied warranty of
//		MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//		GNU General Public License for more details.
//
//		You should have received a copy of the GNU General Public License
//		along with this program.  If not, see <http://www.gnu.org/licenses/>.

//		thanks http://www.apptite.be/blog/ios/sample-ios-application-stopwatch/

#import <UIKit/UIKit.h>

@interface CustomChronometer : UILabel

@property (nonatomic,retain) NSTimer *stopWatchTimer;
@property (nonatomic,retain) NSDate *startDate;
@property (nonatomic,retain) NSString *resetLabel;
@property BOOL running;

- (void) updateTimer;
- (void) start;
- (void) stop;
- (void) reset;
- (BOOL) isRunning;
- (double) getElapsedTime;

@end

CustomChronometer.m

//		CustomChronometer Copyright (C) 2012 Ademar Alves de Oliveira and jurema.la
//
//		This program is free software: you can redistribute it and/or modify
//		it under the terms of the GNU General Public License as published by
//		the Free Software Foundation, either version 3 of the License, or
//		(at your option) any later version.
//
//		This program is distributed in the hope that it will be useful,
//		but WITHOUT ANY WARRANTY; without even the implied warranty of
//		MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//		GNU General Public License for more details.
//
//		You should have received a copy of the GNU General Public License
//		along with this program.  If not, see <http://www.gnu.org/licenses/>.

#import "CustomChronometer.h"

@implementation CustomChronometer

@synthesize stopWatchTimer;
@synthesize startDate;
@synthesize resetLabel;
@synthesize running;

- (id)initWithFrame:(CGRect)frame
{
	self = [super initWithFrame:frame];
	if (self) {
		resetLabel = @"00:00";
		[self setBackgroundColor:[UIColor clearColor]];
		[self reset];
		[self setRunning:NO];
	}
	return self;
}

- (BOOL) isRunning
{
	return self.running;
}

- (void) stop
{
	[stopWatchTimer invalidate];
	stopWatchTimer = nil;
	[self updateTimer];
	[self setRunning:NO];
}
- (void) reset
{
	startDate = nil;
#if __has_feature(objc_arc)
	startDate = [NSDate date];
#else
	startDate = [[NSDate date] retain];
#endif
	[self setText:resetLabel];
}

- (void) start
{
	[self reset];
	stopWatchTimer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(updateTimer) userInfo:nil repeats:YES];
	[self setRunning:YES];
}

- (void) updateTimer
{
	
#if __has_feature(objc_arc)
	NSDate *currentDate = [NSDate date];
#else
	NSDate *currentDate = [[NSDate date] retain];
#endif
	NSTimeInterval timeInterval = [currentDate timeIntervalSinceDate:startDate];

#if __has_feature(objc_arc)
	NSDate *timerDate = [NSDate dateWithTimeIntervalSince1970:timeInterval];
#else
	NSDate *timerDate = [[NSDate dateWithTimeIntervalSince1970:timeInterval] retain];
#endif

	NSDateFormatter *dateFormatter = [NSDateFormatter new];
	
	//HH:mm:ss.SSS
	int x = [[[[NSString stringWithFormat:@"%@",timerDate] componentsSeparatedByString:@" "][1] componentsSeparatedByString:@":"][0] intValue];
	if (x > 0)
		[dateFormatter setDateFormat:@"HH:mm"];
	else
		[dateFormatter setDateFormat:@"mm:ss"];
	
	[dateFormatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0.0]];
	[self setText:[dateFormatter stringFromDate:timerDate]];
	
#if __has_feature(objc_arc)
#else
	[dateFormatter release];
	[timerDate release];
	[currentDate release];
#endif
}

#if __has_feature(objc_arc)
#else
- (void) dealloc
{
	[stopWatchTimer release];
	[startDate release];
	[resetLabel release];
	[super dealloc];
}
#endif

- (double) getElapsedTime
{
	return [[NSDate dateWithTimeIntervalSince1970:[[NSDate date] timeIntervalSinceDate:startDate]] timeIntervalSince1970] / 3600;
}

@end