BlurAndVibrancy.m

- (void)viewDidLoad
{
   [super viewDidLoad];
   
   UIBlurEffect *blurEffect = [UIBlurEffect effectWithStyle:UIBlurEffectStyleDark];
   UIVisualEffectView *blurView = [[UIVisualEffectView alloc] initWithEffect:blurEffect];
   
   UIVibrancyEffect *vibrancyEffect = [UIVibrancyEffect effectForBlurEffect:blurEffect];
   UIVisualEffectView *vibrancyView = [[UIVisualEffectView alloc] initWithEffect:vibrancyEffect];
   
   [[vibrancyView contentView] addSubview:self.label];
   [[vibrancyView contentView] addSubview:self.activityIndicator];
   
   
   // Autolayout
   NSDictionary *views = @{@"blurView": blurView,
                           @"vibrancyView": vibrancyView,
                           @"label": self.label,
                           @"activityIndicator": self.activityIndicator};
   
   [self.view addSubview:blurView];
   blurView.translatesAutoresizingMaskIntoConstraints = NO;
   [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[blurView]|" options:0 metrics:nil views:views]];
   [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[blurView]|" options:0 metrics:nil views:views]];
   
   [self.view addSubview:vibrancyView];
   vibrancyView.translatesAutoresizingMaskIntoConstraints = NO;
   [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[vibrancyView]|" options:0 metrics:nil views:views]];
   [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[vibrancyView]|" options:0 metrics:nil views:views]];
   
   self.activityIndicator.translatesAutoresizingMaskIntoConstraints = NO;
   [vibrancyView addConstraint:[NSLayoutConstraint constraintWithItem:vibrancyView
                                                            attribute:NSLayoutAttributeCenterX
                                                            relatedBy:NSLayoutRelationEqual
                                                               toItem:self.activityIndicator
                                                            attribute:NSLayoutAttributeCenterX
                                                           multiplier:1.0f
                                                             constant:0.0f]];
   
   [vibrancyView addConstraint:[NSLayoutConstraint constraintWithItem:vibrancyView
                                                            attribute:NSLayoutAttributeCenterY
                                                            relatedBy:NSLayoutRelationEqual
                                                               toItem:self.activityIndicator
                                                            attribute:NSLayoutAttributeCenterY
                                                           multiplier:1.0f
                                                             constant:0.0f]];
   
   self.label.translatesAutoresizingMaskIntoConstraints = NO;
   [vibrancyView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[label]|" options:0 metrics:nil views:views]];
   [vibrancyView addConstraint:[NSLayoutConstraint constraintWithItem:self.label
                                                            attribute:NSLayoutAttributeBottom
                                                            relatedBy:NSLayoutRelationEqual
                                                               toItem:self.activityIndicator
                                                            attribute:NSLayoutAttributeTop
                                                           multiplier:1.0f
                                                             constant:-10.0f]];
}