## Design Pattern
Design pattern is
Check [this](https://refactoring.guru/design-patterns/swift) website for design pattern in Swift
### Delegate Pattern
```swift
weak var delegate: SomeProtocol?
```
### Singleton Pattern
```swift
class SingletonPattern {
static let manager = SingletonPattern()
private init() {}
}
```
### Observer Pattern
## Code Structuring
### MVC
### MVVM
##### MVC vs MVVM
M -> Model – Which holds the application data
V –> View – It displays the data that is stored in model. These are visual elements through which a user interacts. These are subclasses of UIView
VM –> View Model – Transform model information/data and it interacts with controller or view to display those informations.
C –> Controller class – It will be there but the responsibility of view business logic has been removed and give to view model
### VIPER
## UIDesign
### HIG(Human Interface Guidelines)
- [Apple UI Kit](https://developer.apple.com/documentation/uikit)
### iOS icon
- [icon8](https://icons8.com/) you can download icons for your **APP**
### UIdesign inspiration
- [dribble](https://dribbble.com/)
- [pinterest](https://pinterest.com/)
- [behance](https://www.behance.net/)
- [pttrns](https://pttrns.com/)
- [awwwards](https://www.awwwards.com/)
- [flickr](http://www.flickr.com/)
- [mobbin](https://mobbin.design/)
## Helper
You can check the file in the follow link
- [Email, Message, Call](https://github.com/jphong1111/Useful_Swift/blob/main/Helper/ConversationManager.swift)
### Usage
import MesaageUI first
```swift
import MessageUI
```
Then use it
```swift
lazy var manager = ConversationManager(presentingController: self, mailDelegate: self, messageDelegate: self )
func sendEmail() -> MFMailComposeViewController {
manager.sendEmail(feedback: MailFeedback(recipients: ["abcd@example.com"], subject: "Sample", body: "Write body"))
}
func sendMessage() -> MFMessageComposeViewController {
manager.sendMessage(feedback: MessageFeedBack(recipients: ["1111111111"], body: "Type here"))
}
func call() {
manager.makeCall(number: "1111111111")
}
```
## API
### Various API Site
- [rapidAPI](https://www.rapidapi.com)
## JSON
JSON is a language-independent data format
> Which is relative with **KEY - VALUE** pair
```json
{
"main": [
{
"title": "example1",
"body": "body1"
},
{
"title": "example2",
"body: "body2"
}
]
}
```
### JSON parser extension for Chrome
This extension makes JSON more structable
[JSON parser pro](https://chrome.google.com/webstore/detail/json-viewer-pro/eifflpmocdbdmepbjaopkkhbfmdgijcc) **FREE** :+1:
### JSON Decoding
### JSONSerialization
## GCD
GCD(Grand Central Dispatch) is a low-level API for managing concurrent operations. It can help you improve your app’s responsiveness by deferring computationally expensive tasks to the background.
### DispatchQueue
#### main
#### global()
### DispatchGroup
### DispatchWorkItem
### Address Sanitizer
Address Sanitizer is a tool to identifies the potential memory-related corruption issues. And it is a good way to find the [Readers and Writers problem](https://en.wikipedia.org/wiki/Readers%E2%80%93writers_problem) in your application.
#### How to Use Address Sanitizer
Go to this Option and Click **EDIT SCHEME...** 👈
And then go to **RUN** and check **ADDRESS SANITIZER** 👈
## Third Party Library
[This github](https://github.com/vsouza/awesome-ios) contains all the popular libraries in Swift:+1:
## Useful Stuff
### Show Preview in UIKit(Build UI with Code Base) 👍 👍 👍 👍 👍
Copy this code and Paste into your controller
```swift
import SwiftUI
struct ViewControllerRepresentable: UIViewControllerRepresentable {
typealias UIViewControllerType = ViewController
func makeUIViewController(context: Context) -> ViewController {
return ViewController()
}
func updateUIViewController(_ uiViewController: ViewController, context: Context) {
}
}
@available(iOS 13.0.0, *)
struct ViewPreview: PreviewProvider {
static var previews: some View {
ViewControllerRepresentable()
}
}
```
Enable canvas option like this
**You are GOOD TO GO** 👏👏👏
## Write README.md
[This](https://medium.com/@saumya.ranjan/how-to-write-a-readme-md-file-markdown-file-20cb7cbcd6f) will help you to write a README.md file more dynamically 👍