TaxiArrivingAnnotation.m

#import "TaxiArrivingAnnotation.h"

#define SECONDS_IN_A_MINUTE 60

@interface TaxiArrivingAnnotation ()
@property (nonatomic) NSTimer * timer;
@property (nonatomic) NSDate * timeOfArrival;
@property (nonatomic, weak) id token1;
@property (nonatomic, weak) id token2;
@end

@implementation TaxiArrivingAnnotation

- (id)init
{
    self = [super init];
    if (self) {
        __weak TaxiArrivingAnnotation * this = self;
        
        self.token1 = [[NSNotificationCenter defaultCenter] addObserverForName:UIApplicationDidBecomeActiveNotification object:nil queue:nil usingBlock:^(NSNotification *note)
        {
            NSLog(@"DID BECOME ACTIVE");
            NSTimeInterval secondsLeft = [this.timeOfArrival timeIntervalSinceNow];
            if (secondsLeft < 0) {
                self.minutesToTaxiArrival = 0;
                return;
            }
            
            this.minutesToTaxiArrival = secondsLeft / SECONDS_IN_A_MINUTE;
            
            [this startTimer];
        }];
        
        self.token2 = [[NSNotificationCenter defaultCenter] addObserverForName:UIApplicationWillResignActiveNotification object:nil queue:nil usingBlock:^(NSNotification *note)
       {
           NSLog(@"WILL RESIGN ACTIVE");
           [this.timer invalidate];
           this.timer = nil;
       }];
        
//        [[NSNotificationCenter defaultCenter]addObserver:self
//                                                selector:@selector(didBecomeActive)
//                                                    name:UIApplicationDidBecomeActiveNotification
//                                                  object:nil];
//        
//        [[NSNotificationCenter defaultCenter]addObserver:self
//                                                selector:@selector(willResignActive)
//                                                    name:UIApplicationWillResignActiveNotification
//                                                  object:nil];
        
    }
    return self;
}


-(void) setMinutesToTaxiArrival:(int)newMinutes {
    self->_minutesToTaxiArrival = newMinutes;
    self->_timeOfArrival = [NSDate dateWithTimeIntervalSinceNow:SECONDS_IN_A_MINUTE * newMinutes];
    if (newMinutes < 0) {
        [self.timer invalidate];
    }
}

//-(void) didBecomeActive {
//    NSTimeInterval secondsLeft = [self.timeOfArrival timeIntervalSinceNow];
//    if (secondsLeft < 0) {
//        self.minutesToTaxiArrival = 0;
//        return;
//    }
//    
//    self.minutesToTaxiArrival = secondsLeft / SECONDS_IN_A_MINUTE;
//    
//    [self startTimer];
//}

//-(void) willResignActive {
//    [self.timer invalidate];
//    self.timer = nil;
//}

-(void) startTimer {
    self.timer = [NSTimer timerWithTimeInterval:SECONDS_IN_A_MINUTE target:self selector:@selector(aMinutedPassed) userInfo:nil repeats:YES];
    [[NSRunLoop currentRunLoop] addTimer:self.timer forMode:NSDefaultRunLoopMode];
}

-(void) aMinutedPassed {
    self.minutesToTaxiArrival--;
}

-(void) dealloc {
   NSLog(@"DEALLOC");
    if (self.timer != nil && [self.timer isValid])
        [self.timer invalidate];
//    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationWillResignActiveNotification object:nil];
//    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationDidBecomeActiveNotification object:nil];
    [[NSNotificationCenter defaultCenter] removeObserver:self.token1];
    [[NSNotificationCenter defaultCenter] removeObserver:self.token2];
}
@end