逐块执行不执行

Question

I have ViewController with -updateUI method. It is needs to be called periodically while AVPlayer plays.

So this is in -viewDidLoad (note, self.track is not a AVPlayer instance, it is instance of class Track with almost the same method that AVPlayer has):

__weak ViewController * selfWeak = self;
[self.track addPeriodicTimeObserverForInterval:CMTimeMake(1, 20)
                                         queue:dispatch_get_main_queue()
                                    usingBlock:^{
                                        [selfWeak updateUI];
                                        NSLog(@"THIS BLOCK DOESN'T EXECUTE");
}];

This is implementation of this method in Track Class:

- (void) addPeriodicTimeObserverForInterval:(CMTime)interval
                                      queue:(dispatch_queue_t)queue
                                 usingBlock:(void (^)(void))block
{
        self.periodicObserverBlock = block;
        self.observeQueue = queue;
        self.observeInterval = interval;
        self.waitingToObserve = YES;
}

Property declaration:

typedef void(^observeHandler)();
@property (nonatomic, strong) observeHandler periodicObserverBlock;
@property (nonatomic) CMTime observeInterval;
@property (nonatomic) dispatch_queue_t observeQueue;

I'm saving it for time, when AVPlayer ready. When it is ready, I'm doing this:

- (void) afterLoadingMethod
{
        __weak Track *selfWeak = self;
        [self.player addPeriodicTimeObserverForInterval:self.observeInterval
                                                  queue:self.observeQueue
                                             usingBlock:^(CMTime t){
                                                 (void) selfWeak.periodicObserverBlock;
                                                 NSLog(@“THIS BLOCK EXECUTES”);
                                             }];
}

The problem is that block that says -updateUI doesn't execute. (It is marked with NSLog(@“THIS BLOCK DOESN'T EXECUTE)). Block that calling in Track class executes. So I think problem is somewhere in storing properties, somewhere here

self.periodicObserverBlock = block;

Or here:

@property (nonatomic, strong) observeHandler periodicObserverBlock;

But I didn't figured it out. Thanks in advance.

Answer 1

You're just referencing the block:

(void) selfWeak.periodicObserverBlock;

To call the block, use parenthesis:

selfWeak.periodicObserverBlock();