🎰Slot Machine on Apple iOS 8.3. Vendor: Apple Version: iOS 8.3 This is how the 🎰 Slot Machine emoji appears on Apple iOS 8.3.It may appear differently on other platforms. IOS 8.3 was released on April 8, 2015.

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The purpose of the game will be to drop your balls in such a way that they land in good slots and not bad ones. We have bouncers in place, but we need to fill the gaps between them with something so the player knows where to aim.

We'll be filling the gaps with two types of target slots: good ones (colored green) and bad ones (colored red). As with bouncers, we'll need to place a few of these, which means we need to make a method. This needs to load the slot base graphic, position it where we said, then add it to the scene, like this:

Unlike makeBouncer(at:), this method has a second parameter – whether the slot is good or not – and that affects which image gets loaded. But first, we need to call the new method, so add these lines just before the calls to makeBouncer(at:) in didMove(to:):

The X positions are exactly between the bouncers, so if you run the game now you'll see bouncer / slot / bouncer / slot and so on.

One of the obvious-but-nice things about using methods to create the bouncers and slots is that if we want to change the way slots look we only need to change it in one place. For example, we can make the slot colors look more obvious by adding a glow image behind them:

That basically doubles every line of code, changing 'Base' to 'Glow', but the end result is quite pleasing and it's clear now which slots are good and which are bad.

We could even make the slots spin slowly by using a new class called SKAction. SpriteKit actions are ridiculously powerful and we're going to do some great things with them in later projects, but for now we just want the glow to rotate very gently.

Before we look at the code to make this happen, you need to learn a few things up front:

• Angles are specified in radians, not degrees. This is true in UIKit too. 360 degrees is equal to the value of 2 x Pi – that is, the mathematical value π. Therefore π radians is equal to 180 degrees.
• Rather than have you try to memorize it, there is a built-in value of π called CGFloat.pi.
• Yes CGFloat is yet another way of representing decimal numbers, just like Double and Float. Behind the scenes, CGFloat can be either a Double or a Float depending on the device your code runs on. Swift also has Double.pi and Float.pi for when you need it at different precisions.
• When you create an action it will execute once. If you want it to run forever, you create another action to wrap the first using the repeatForever() method, then run that.

Our new code will rotate the node by 180 degrees (available as the constant CGFloat.pi or just .pi) over 10 seconds, repeating forever. Put this code just before the end of the makeSlot(at:) method:

If you run the game now, you'll see that the glow spins around very gently. It's a simple effect, but it makes a big difference.

The picker is a slot-machine view to show one or more sets of values. Users select values by rotating the wheels so that the desired row of values aligns with a selection indicator. The user interface provided by a picker view consists of components and rows. A component is a wheel, which has a series of rows at indexed locations on the wheel. This tutorial is made with Xcode 10 and built for iOS 12.

Project Setup

Open Xcode and create a new Single View App.

For product name, use iOSPickerTutorial and then fill out the Organization Name and Organization Identifier with your customary values. Enter Swift as Language and choose Next.

Storyboard Setup

Go to the Storyboard. Add a Picker View to the main view. Select the Resolve Auto Layout Issues button and select Reset to Suggested Constraints.

Select the Assistant Editor and make sure the ViewController.swift file is visible. Ctrl-drag or right-click-drag from the Picker View to the ViewController class and create the following Outlet.

Coding

Go to the ViewController.swift file. The Picker View must conform to the UIPickerViewDataSource and UIPickerViewDelegate protocol. Change the class declaration line to

We must provide the Picker View with values. Add the following array in the ViewController class.

The colors array will be the data source for our Picker View. The UIViewDataSource protocol requires delegate methods to define the number of components and rows of a picker. Implement these methods.

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We define one component with the number of rows equal to the number of array items. Next, we assign the data in our array to the corresponding row.

Project Execution

Build and Run the project, the different colors can be selected inside the Picker View.

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You can download the source code of the iOSPickerTutorial at the ioscreator repository on Github.