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//
// NSTimer+AbsoluteFireDate.m
//
// Created by Adam Ernst on 11/26/10.
// Copyright 2010 cosmicsoft. All rights reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#import "NSTimer+AbsoluteFireDate.h"
@interface NSTimerAbsoluteFireDateTracker : NSObject {
NSMutableArray *timers;
}
+ (NSTimerAbsoluteFireDateTracker *)sharedTracker;
- (void)trackTimer:(NSTimer *)timer;
@end
@implementation NSTimer (AbsoluteFireDate)
- (id)initWithAbsoluteFireDate:(NSDate *)date target:(id)target selector:(SEL)aSelector userInfo:(id)userInfo {
NSTimer *timer = [self initWithFireDate:date interval:0.0 target:target selector:aSelector userInfo:userInfo repeats:NO];
[[NSTimerAbsoluteFireDateTracker sharedTracker] trackTimer:timer];
return timer;
}
@end
@implementation NSTimerAbsoluteFireDateTracker
- (id)init {
if (self = [super init]) {
timers = [[NSMutableArray alloc] init];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(checkTimers:) name:UIApplicationDidBecomeActiveNotification object:nil];
if (&UIApplicationWillEnterForegroundNotification != NULL) {
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(checkTimers:) name:UIApplicationWillEnterForegroundNotification object:nil];
}
}
return self;
}
- (void)dealloc {
if (&UIApplicationWillEnterForegroundNotification != NULL) {
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationWillEnterForegroundNotification object:nil];
}
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationDidBecomeActiveNotification object:nil];
[timers release];
[super dealloc];
}
static NSTimerAbsoluteFireDateTracker *sharedTracker;
+ (NSTimerAbsoluteFireDateTracker *)sharedTracker {
if (sharedTracker == nil) {
sharedTracker = [[NSTimerAbsoluteFireDateTracker alloc] init];
}
return sharedTracker;
}
- (void)trackTimer:(NSTimer *)timer {
[timers addObject:timer];
}
- (void)checkTimers:(NSNotification *)notification {
NSMutableArray *timersToRemove = [NSMutableArray array];
// The timers array might be mutated if a fired timer
// in turn creates an absolute-fire-date timer of its own.
// Make a copy to avoid this problem.
NSArray *currentTimers = [timers copy];
for (NSTimer *timer in currentTimers) {
if ([timer isValid]) {
if ([[NSDate date] timeIntervalSinceDate:[timer fireDate]] > 0.0) {
[timer fire];
} else {
[timer setFireDate:[timer fireDate]];
}
}
if (![timer isValid]) {
[timersToRemove addObject:timer];
}
}
[currentTimers release];
[timers removeObjectsInArray:timersToRemove];
}
@end