Most of your code is fine except what's going on in the randomBackground method. The following line:

[self.view insertSubview:backgroundImage atIndex:0];

Inserts a new view behind all the existing views. You should not have to continually insert new views. All you need to do is have an ImageView property which should be an IBOutlet to an image view in your Storyboard. Then within your randomBackground method you can do the following:

-(void)randomBackground
{
    NSString *imgName = [self.quoteModel randomImages];

    UIImage *randomImage = [UIImage imageNamed:imgName];

    self.backgroundImage.image = randomImage;

}

In the last line where you say self.backgroundImage.image = randomImage; is confusing me a bit. I have created an IBOutlet in my ViewController header file like @property (strong, nonatomic) IBOutlet UIImageView *image; and linked it to the storyboard and have a default image before clicked and ensured the UIImageView is at index:0. Hope am on the right track. Then my randomBackground looks like so:

-(void)randomBackground
{
    NSString *imgName = [self.quoteModel randomImages];

    UIImage *randomImage = [UIImage imageNamed:imgName];

}

So where is that self.backgroundImage coming from or what is it? As for the last .image I assume is the IBOutlet.Would really appreciate if can get clarifications here.

Thanks now its working but I have tried to reuse the same method under the shake motion but the background is not changing. My goal is to change the background for both touch and shaking.

-(void)randomBackground { NSString *imgName = [self.quoteModel randomImages];

UIImage *randomImage = [UIImage imageNamed:imgName];

self.backgroundImage.image = randomImage;

}

pragma mark - Motion events

-(void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event { self.quoteLabel.text = nil; [self backgroundImage]; }

-(void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event { if (motion == UIEventSubtypeMotionShake) { [self backgroundImage]; self.quoteLabel.text = [self.quoteModel randomQuote]; }

}

You should be calling the randBackground method in your motionEnded method: [self randomBackground];

This might sound strange but Its not working. Here is how i do it

-(void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event { if (motion == UIEventSubtypeMotionShake) { [self backgroundImage]; self.quoteLabel.text = [self.quoteModel randomQuote]; }

}