Animation delay on CrystalBall app

//  AJMViewController.m
#import "AJMViewController.h"
#import "AJMCrystalBall.h"
#import <AudioToolbox/AudioToolbox.h> 

@interface AJMViewController ()
@end

@implementation AJMViewController {
    SystemSoundID soundEffect; 
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.crystalBall = [[AJMCrystalBall alloc] init];  
    self.backgroundImageView.animationImages = [[NSArray alloc] initWithObjects:
                                            [UIImage imageNamed:@"CB00001"],
                                            [UIImage imageNamed:@"CB00002"],
                                            [UIImage imageNamed:@"CB00003"], 
                                            //.... and so on
                                            [UIImage imageNamed:@"CB00059"],
                                            [UIImage imageNamed:@"CB00060"], nil];
    self.backgroundImageView.animationDuration = 2.0f;
    self.backgroundImageView.animationRepeatCount = 1;

    NSString *pathSound = [[NSBundle mainBundle] pathForResource:@"crystal_ball" ofType:@"mp3"];
    NSURL *soundURL = [NSURL fileURLWithPath:pathSound];
    AudioServicesCreateSystemSoundID(CFBridgingRetain(soundURL), &(soundEffect));
}

-(void)makePredictions {
    [self.backgroundImageView startAnimating];
    self.predictionLabel.text = [self.crystalBall randomPrediction];
    [UIView animateWithDuration:4.5f animations:^{
        self.predictionLabel.alpha = 1.0f;
    }];
    AudioServicesPlaySystemSound(soundEffect); // Lenguaje C. Play!!
}


#pragma mark - Motion Events
-(void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event {
    self.predictionLabel.text = nil;
    self.predictionLabel.alpha = 0.0f;
}
-(void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event {
    if (motion == UIEventSubtypeMotionShake) {
        [self makePredictions];
    }
}
-(void)motionCancelled:(UIEventSubtype)motion withEvent:(UIEvent *)event {
    NSLog(@"motion cancelled");
}


#pragma mark - Touch Events
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    self.predictionLabel.text = nil;
    self.predictionLabel.alpha = 0.0f;
}
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    [self makePredictions];
}
-(void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event {
    NSLog(@"Touches cancelled");
}

@end

//  AJMCrystalBall.m
#import "AJMCrystalBall.h"

@implementation AJMCrystalBall

-(NSArray *)predictions {
    if (_predictions == nil) {
        _predictions = [[NSArray alloc] initWithObjects:@"It is certain",
                    @"It is decidedly so", @"All the signs say YES!",
                    @"The starts are not aligned", @"My reply is no.",
                    @"It is doubtful", @"Better no to tell you", nil];
    }
    return _predictions;
}

-(NSString *) randomPrediction {
    int random = arc4random_uniform(self.predictions.count);
    return [self.predictions objectAtIndex:random];
}

@end