To have a strong command over the Swift language, however, an IOS developer needs to get acquainted with the various types of design patterns that are used and implemented when designing the applications. Such trends provide highly efficient, intrusive, and stable applications. We may therefore first shed some light on a design pattern concept to know what it is.
The Three Big Computer Development Patterns in IOS
In general the architecture patterns used in the development of Swift IOS can be categorized into three major categories.
- Creative
- Construction
- Conduct
1. Creative
The patterns of creational design are helpful in creating structures for the object. This provides concrete evidence in favor of artifacts, to make it suitable for a particular condition. The patterns of creational architecture include a number of methods including Singleton, Plant, Abstract, Builder etc. We will have a short discussion on each of these:
The singleton solution
The Singleton method is inferred when only one instance is provided for a given class or a single copy of an object. Globally, the single instance is getting the control. It makes use of a lazy loading process to develop the single instance during the initial attempt.
This is in reality a growing approach employed by Apple. Use, for example:
Standard User Default default, UIApplication.shared, UIScreen.main, FileManager.default all return an object with a singleton.
You can even create a private initializer for the class EventManager. This will prevent anybody from making another copy of the product. You can also add the static variable to the sharedinstance and initialize it with the object Event Manager
private override init() {}
static let sharedInstance = EventManager()
override func copy() -> Any {
“)
}
override func mutableCopy() -> Any {
}
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The Factory Method in IOS
You will need to use the Factory Method when choosing between the integrated classes of common protocols and those which share a common base class. This style pattern has a logic that determines class selection. Through this approach the whole logic covers the solution. You will select one of the two here; global system or base class. So, the global process example is as follows.
func createRentalCar(_ passengers:Int) -> RentalCar? {
var carImp: RentalCar.Type?
switch passengers {
case 0…3: carImp = Compact.self
case 4…8: carImp = SUV.self
default: carImp = nil
}
return carImp?.createRentalCar(passengers)
}
Abstract Method In IOS
The method Abstract is the same as the process Farm. The only difference is that a community of objects is formed with it. By pattern you can’t predict execution. It helps to pick a given piece.
final class func getFactory(car: Cars) -> CarFactory? {
var factory: CarFactory?
switch car {
case .compact: factory = CompactCarFactory()
case .sports: factory = SportsCarFactory()
case .SUV: factory = SUVCarFactory()
}
return factory
The abstract approach can be found at the abstract foundation, which is used to construct the car’s structure.
Unit creator in IOS
When you want to systematically create complex structures from the basic ones, then opt for the method of constructing them. The advantage here is that if you are creating different artifacts you need to use the same code. The Builder Method distinguishes the object’s construct from its own class.
This function is given to specific objects known as the constructors and is split into several steps. The benefit, however, is that you don’t need to read all of the steps, but only those required to create an object using a particular configuration.
A very good example is when you’re creating an IOS restaurant app and want to incorporate the features of the order. The Order or Dish can be implemented using the class OrderBuilder.
2. Construction
The Structural Design Pattern’s goal is to simplify the design process, and to find a simple way to connect classes and artifacts. This also involves different approaches such as the MVC, Adapter, Facade, Decorator, and Bridge etc.
MVC
The MVC or the Model-View-Controller is considered an important design pattern for the development of IOS devices. The Model is inferred with data only. The View can be correlated with anything including the gui design and the animation buttons being generated. But use of a different class to draw the animation is advisable.
Finally, as with the Controller, it brings everything together. However, because of the logic associated with the layout the controller is known for its complexity. A more complex pattern called model-view-viewModel (MVVM) can also be used.
Suitable for adaptation
The adapter is a structural pattern that allows simultaneous operation of objects with identical or identical interfaces. The adapter will encapsulate the entity that manages the meters and turn the data into feet.
As such, where there is an inconsistency in the interface, the Adapter is available when implementing third-party classes and it does not fit the rest of the application code. You may also do it when you have to hire several current subclasses and they do not comply with a particular specification.
The IOS device Calendar and Event Management is a good illustration for demonstrating the Adapter process. To implement the calendar you need to add the EventKit system and adapt the Event model from the frame. The Adapter includes the application code to make it compliant with the app’s architecture.
Decorator
This method, as the name implies, helps to attach the new functionalities to an item and wrap them in wrappers. Therefore, the style pattern is also known as the Wrapper. This helps to bring the actions and accountability to the object without modifying the codes.
The decorator offers the advantage that when using the third-party libraries, you do not need to access the source code. An ideal example of this style pattern can be provided when incorporating data management into the IOS application.
You will need two types of decorators; Encryption Decorator and Encoding Decorator that are used to encrypt and decrypt data, and to encode and decode data.
Back facade
The Facade is a useful pattern which provides an easy interface for libraries, frameworks, or the complicated class group. The developers do not need to view a number of methods with different interfaces.
It helps to create your own class and bundle the other objects in it giving users a simpler version of the code. During the decomposition of subsystems into different layers Facade is also beneficial.
The Facade example can be cited when the audio recording and replay feature is incorporated into your IOS app. The Facade helps to hide the file system.
3. Conduct
The behavioral design patterns are rather helpful in crossing the typical patterns of communication between the units and incorporating these patterns. This also contains several essential approaches including those such as the Model Process, Observer, Momento, and Order.
The truth is, however, that most behavioral patterns are seldom seen or used. So, we ‘d talk about the important ones.
Form Model
The Template Method is a behavioral pattern that is usually regarded as the core of the algorithm, and is responsible for the phases of the subsystem. It helps subclasses redefine an algorithm’s phases without the overall structure modification. The algorithm is divided into a number of steps and with the aid of template method each of those steps is defined in different methods.
The explanation is as follows- You’re developing software to take and save the photos for which smartphone camera (iPhone or iPad) and photo gallery permission is necessary. Therefore, you can implement the base level Permission Service with a different algorithm.
In the names Camera Permission Service and Photo Permission Service, you are expected to create a few subclasses which would reinvent certain algorithm steps and others would stay the same.
Pad
Within this pattern the object effectively notifies other objects about their state transition. One object is a symbol of the other’s changes. Push Notifications are an example.
Time to go
This pattern helps by using the Core Data to save artifacts such as User Defaults, Archiving, and NS Coding Protocol.
Request
In the command pattern, a method to get an interface is connected to an action contact.
Conclusion
I have almost addressed some of the essential trends in design software that help build the IOS apps while using the Swift language. But there are several other template patterns that you can also use according to the project’s requirement. You can learn more through ios online training.
