Animating and Intercepting Events - Extra Credit

Question

I am really curious about the extra credit question, so I decide to do it just to get more practice and understanding of Objective-C programing. So, when I run program it works, I am not really understanding how it is working though, cause right now it animates the text down, but doesn't animate back up. It just pops back to the center of the screen, you don't see it move back up at all. Also, I have no idea how to go about the using the tap count property for the second part of the extra credit. Anyways, here is my code, any help would be great!

- (void) makePrediction {
    [self.backgroundImageView startAnimating];
    self.predictionLabel.text = [self.crystalBall randomPrediction];
    self.predictionLabel.textColor = [self.crystalBall randomColor];
    AudioServicesPlaySystemSound(soundEffect);
    [UIView animateWithDuration:1.0 animations:^{
        self.predictionLabel.frame = CGRectMake(36, 329, 249, 145);
    } completion:^(BOOL finished) {
        self.predictionLabel.frame = CGRectMake(36, 184, 249, 145);
    }];
}

- (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    self.predictionLabel.text = nil;
    [self makePrediction];
}

- (void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {

}

Answer 1 · 2014-08-27T03:18:46Z

August 27, 2014 3:18am

ok so the reason it's doing that is because in the completion you say "Hey when you're done moving nice and animated to your new bounds instantly relocated to the completion bounds" the way to solve this would be to say something like

- (void) makePrediction {
    [self.backgroundImageView startAnimating];
    self.predictionLabel.text = [self.crystalBall randomPrediction];
    self.predictionLabel.textColor = [self.crystalBall randomColor];
    AudioServicesPlaySystemSound(soundEffect);
    [UIView animateWithDuration:1.0 animations:^{
        self.predictionLabel.frame = CGRectMake(36, 329, 249, 145);
    } completion:^(BOOL finished) {
        [UIView animateWithDuration: 1.0 /* next it takes a block but i don't remember what it is*/ block ^{
          self.predictionLabel.frame = CGRectMake(36, 184, 249, 145);
}
    }];

}

this will make it animate over 1 secound to the new bounds making it animate up the in the completion block we animate it back down

now, I've never believed in giving the answer so i'll lead you in the right direction for the secound part, simply google tap gesture recognizers and specifically double-tap recognizer (at least I'm pretty sure that's one) the way you implement these are by doing a UIDoubleTapGesturRecognizer then name it and allocate and initialize it (so make a new one) then add it to the object so the view. it would look something like this.

UIDoubleTapGestureRognizer *doubleTap = [[UIDoubleTapGestureRecognizer alloc] initWithTarget: self action: @selector(someMethodThatHandlesGoal) /* again there is probably more but you can google how to use double tap recognizers */];

[self.view addRecognizer: doubleTap];

//then make the method for someMethodThatHandlesGoal and it would be a void so ill give you a start

-(void)someMethodThatHandlesGoal{
    ///TODO: make your things to achieve goal number 2 that you didn't know
}

anyways this is alot to take in so I'd be happy to help explain.

Happy hacking, Kai.

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Christian Binamira

Christian Binamira

Animating and Intercepting Events - Extra Credit

1 Answer

Kai Aldag

Kai Aldag