CODEWITHSUNDEEP
iphoneobjective-ciosipadaudio
garethdn
garethdn

Reputation: 12351

Passing arguments with AudioServicesAddSystemSoundCompletion

I'm trying to pass a UILabel with AudioServicesAddSystemSoundCompletion but i'm not able to manipulate the value within the completionCallback method. I'm using ARC and Xcode suggested adding (_bridge void*).

Any help would be much appreciated.

-(void) playWordSound:(UILabel *)label
{
    NSString *path;
    SystemSoundID soundId;
    switch (label.tag)
    {
        case 1:
            ..........
            break;
    }
    NSURL *url = [NSURL fileURLWithPath:path];
    AudioServicesCreateSystemSoundID( (CFURLRef)objc_unretainedPointer( url), &soundId);
    AudioServicesPlaySystemSound(soundId);
    AudioServicesAddSystemSoundCompletion (soundId, NULL, NULL, 
                                           completionCallback,
                                           (__bridge void*) label);
}


static void completionCallback (SystemSoundID  mySSID, void* data) {
    NSLog(@"completion Callback");
    AudioServicesRemoveSystemSoundCompletion (mySSID);
    //the below line is not working
    //label.textColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:1];
}

Upvotes: 1

Views: 884

Answers (1)

Joe
Joe

Reputation: 57179

In the completion handler the label is stored in data. You need to __bridge it back to use it. 

static void completionCallback (SystemSoundID  mySSID, void* data) {
    NSLog(@"completion Callback");
    AudioServicesRemoveSystemSoundCompletion (mySSID);
    UILabel *label = (__bridge UILabel*)data;
    label.textColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:1];
}

Upvotes: 3

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