UIMotionEffect Demo

gistfile1.m

- (void)viewDidLoad
{
    [super viewDidLoad];
  
    CGRect frame = self.view.bounds;
    
    for (NSInteger i=0; i<10; i++) {
        CGFloat left = (frame.size.width-100)/2+i%2*10;
        CGFloat top = (frame.size.height-100)/2+i%3*10;
        
        UIView *demoView = [[UIView alloc] initWithFrame:CGRectMake(left, top , 100, 100)];
        demoView.backgroundColor = [UIColor colorWithRed:i/12.0f green:i/18.0f blue:i/24.0f alpha:0.8];
        [self.view addSubview:demoView];
        
        
        UIInterpolatingMotionEffect *xAxis = [[UIInterpolatingMotionEffect alloc] initWithKeyPath:@"center.x" type:UIInterpolatingMotionEffectTypeTiltAlongHorizontalAxis];
        UIInterpolatingMotionEffect *yAxis = [[UIInterpolatingMotionEffect alloc] initWithKeyPath:@"center.y" type:UIInterpolatingMotionEffectTypeTiltAlongVerticalAxis];

        left += i*50;
        top += i *50;
        xAxis.minimumRelativeValue = @(-left);
        xAxis.maximumRelativeValue = @(left);
        
        yAxis.minimumRelativeValue = @(-top);
        yAxis.maximumRelativeValue = @(top);
        
        UIMotionEffectGroup *motionEffectGroup = [[UIMotionEffectGroup alloc] init];
        motionEffectGroup.motionEffects = @[xAxis, yAxis];
        [demoView addMotionEffect:motionEffectGroup];
    }
}