Alamofire class

 https://drive.google.com/file/d/1ybxid8ySCkthtX3hSF3jCbRModW2_q2y/view?usp=sharing

What is the difference between protocol, extension and category in IOS development? And how to use them appropriately?

Protocols


A protocol declares a programmatic interface that any class may choose to implement.


A protocol defines a blueprint of methods, properties, and other requirements that suit a particular task or piece of functionality. Protocols are like Interfaces, that provide some methods that the class conforming must implement.


Uses:
A common use case is to let you alter the behavior of certain classes without the need to subclass them.
Eg: UITableViewDelegate, UITableViewDataSource




Extension


Extensions add new functionality to an existing class, structure, enumeration, or protocol type. This includes the ability to extend types for which you do not have access to the original source code (known as retroactive modeling).


Extensions are similar to categories in Objective-C. (Unlike Objective-C categories, Swift extensions do not have names.)


Uses:


Categories are a way to modularize a class by spreading its implementation over many files. Extensions provide similar functionality.


One of the most common uses of categories is to add methods to built-in data types like NSString or NSArray. The advantage of this is that you don’t have to update the existing code to use a new subclass

IOS APP DATABASE INTEGRATION USING FMDB

STEP ONE CREATE DATABASE AND TABLE

COPY DATA BASE INTO PROJECT

// util.copydataBase("Sata.db") Write this Line IN APPdelegate file after Downloading Zip File and copy into your project

https://drive.google.com/file/d/1nptZ8mE6jc-iCC-EjEtqu5NSVHfAm0SE/view?usp=sharing

Set Below code in your viewcontroller where you want to save data

 @IBAction func SaveClick(_ sender: UIButton)

    {

        let modelinfo = SignuModel(fname: txtFname.text!, lname: txtLname.text!, dob: txtDOB.text!, email: txtEmail.text!)

        let isSave = DBHelper.getinstance().savedata(modelinfo)

        print(isSave)

    }

Service Call With NsUrlSession

func loginWS(parameters:[String:String], completionHandler: @escaping (Any?) -> Swift.Void) {

    guard let gitUrl = URL(string: BASE_URL+ACTION_URL) else { return }
    print(gitUrl)

    let request = NSMutableURLRequest(url: gitUrl)
    //  uncomment this and add auth token, if your project needs.
    //  let config = URLSessionConfiguration.default
    //  let authString = "Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ1c2VyX2lkIjoxMywiUGFzc3dvcmQiOiIkMmEkMTAkYVhpVm9wU3JSLjBPYmdMMUk2RU5zdU9LQzlFR0ZqNzEzay5ta1pDcENpMTI3MG1VLzR3SUsiLCJpYXQiOjE1MTczOTc5MjV9.JaSh3FvpAxFxbq8z_aZ_4OhrWO-ytBQNu6A-Fw4pZBY"
    //  config.httpAdditionalHeaders = ["Authorization" : authString]

    let session = URLSession.shared
    request.httpMethod = "POST"
    request.addValue("application/json", forHTTPHeaderField: "Content-Type")
    request.addValue("application/json", forHTTPHeaderField: "Accept")
    request.httpBody = try! JSONSerialization.data(withJSONObject: parameters, options: [])

    let task = session.dataTask(with: request as URLRequest) { data, response, error in

        guard let data = data else { return }
        do {
        //  let decoder = JSONDecoder()
        //  here replace LoginData with your codable structure.
            let gitData = try JSONDecoder().decode(LoginData.self, from: data)
            print("response data:", gitData) 
            completionHandler(gitData)
        } catch let err {
            print("Err", err)
        }
        }.resume()
}

Height Label Swift

extension UILabel

{

// SwifterSwift: Initialize a UILabel with text

    public convenience init(text: String?)

    {

self.init()

self.text = text

}

// SwifterSwift: Required height for a label

    public var requiredHeight: CGFloat

    {

let label = UILabel(frame: CGRect(x: 0, y: 0, width: frame.width, height: CGFloat.greatestFiniteMagnitude))

label.numberOfLines = 0

label.lineBreakMode = NSLineBreakMode.byWordWrapping

label.font = font

label.text = text

label.attributedText = attributedText

label.sizeToFit()

return label.frame.height

}

    

    // SwifterSwift: Required height for a label

    public var requiredWidth: CGFloat

    {

        let label = UILabel(frame: CGRect(x: 0, y: 0, width: CGFloat.greatestFiniteMagnitude, height: frame.height))

        label.numberOfLines = 0

        label.lineBreakMode = NSLineBreakMode.byWordWrapping

        label.font = font

        label.text = text

        label.attributedText = attributedText

        label.sizeToFit()

        return label.frame.width

    }

    

    func halfTextColorChange (fullText : String , changeText : String)

    {

        let strNumber: NSString = fullText as NSString

        let range = (strNumber).range(of: changeText)

        let attribute = NSMutableAttributedString.init(string: fullText)

        attribute.addAttribute(NSAttributedString.Key.foregroundColor, value: Theme.redColor , range: range)

        self.attributedText = attribute

    }

}

/*

  let TotalHeight : Int = Int(cell.lblComment.requiredHeight)

        

        return CGFloat(51+TotalHeight)

*/

Pagination Using Swift Language 4.0 Scroll and Tableview

var isDataLoading:Bool=false
var pageNo:Int=0
var limit:Int=20
var offset:Int=0 //pageNo*limit
var didEndReached:Bool=false

func scrollViewWillBeginDragging(_ scrollView: UIScrollView) {

        print("scrollViewWillBeginDragging")
        isDataLoading = false
    }



    func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
        print("scrollViewDidEndDecelerating")
    }
    //Pagination
    func scrollViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate decelerate: Bool) {

            print("scrollViewDidEndDragging")
            if ((tableView.contentOffset.y + tableView.frame.size.height) >= tableView.contentSize.height)
            {
                if !isDataLoading{
                    isDataLoading = true
                    self.pageNo=self.pageNo+1
                    self.limit=self.limit+10
                    self.offset=self.limit * self.pageNo
                    loadCallLogData(offset: self.offset, limit: self.limit)

                }
            }


    }