SwiftUI Tutorial – Creating and Combining Views

February 7, 2021June 9, 2019 by Ashish Kakkad

SwiftUI announced in WWDC 2019. It’s an innovative, exceptionally simple way to build user interfaces across all Apple platforms with the power of Swift. In previous blog I have shared some references from apple documents.
Swift UI Logo
We will learn it by examples. First of all let’s start with simple UI.

Basic Resources For SwiftUI

February 7, 2021June 3, 2019 by Ashish Kakkad

Apple just announced SwiftUI today.
SwiftUI will be used to declare the user interface and behavior for your app on every platform.

Here are some basic resources to understand SwiftUI:
Apple Documentation
Tutorials for SwiftUI
Sample from WWDC 2019 Event:

Hope it will help you to look into it.
Happy Coding 🙂

Take advantage of raw strings in Swift 5

February 7, 2021April 9, 2019 by Ashish Kakkad

Swift 5 comes with enhancement in string literals delimiters to support Raw Text.
swift5rawstrings

Little snippet to know if application is installed via TestFlight

February 7, 2021February 15, 2019 by Ashish Kakkad

I found little snippet from twitter about how to know if application is installed via TestFlight.
Here, appStoreReceiptURL is an instance property, which we can find from main bundle.

Here, I am adding snippet for both Objective-C and Swift.

Warnings and Errors while upgrading from Swift 4.x to Swift 4.2 in Xcode 10.0

February 7, 2021October 28, 2018 by Ashish Kakkad

Following are warnings and errors will come while upgrading from Swift 4.x to Swift 4.2 in Xcode 10.0
xcode10

Tutorial : Let's take quick dive in Grouped Notifications - iOS 12

February 7, 2021August 7, 2018 by Ashish Kakkad

With iOS 12 we can set the group of notifications
grouped notifications

Thread Identifier

Create notification content with threadIdentifier to create group of that notification. Group will be of the application or specific topic from an application.

// Creating Groups with Thread Identifiers
let content = UNMutableNotificationContent()
content.title = "Notifications Group"
content.body = "Tutorial by Ashish Kakkad"
content.threadIdentifier = "notify-team-ios"

// Creating Groups with Thread Identifiers

let content = UNMutableNotificationContent()

content.title = "Notifications Group"

content.body = "Tutorial by Ashish Kakkad"

content.threadIdentifier = "notify-team-ios"

Notification payload will be like this

{
 "aps" : {
     "alert" : {
         "title" : "Notifications Group",
         "body" : "Tutorial by Ashish Kakkad"
     }
     "thread-id" : "notify-team-ios"
 }
}

{

"aps" : {

"alert" : {

"title" : "Notifications Group",

"body" : "Tutorial by Ashish Kakkad"

}

"thread-id" : "notify-team-ios"

}

Give meaningful name to thread identifier for specific purpose of group.

Summary of group

Simple Notification Group Summary

let summaryFormat = "%u more messages"
return UNNotificationCategory(identifier: "category-identifier", actions: [], intentIdentifiers: [], hiddenPreviewsBodyPlaceholder: nil, categorySummaryFormat: summaryFormat, options: [])

1 2	let summaryFormat = "%u more messages" return UNNotificationCategory(identifier: "category-identifier", actions: [], intentIdentifiers: [], hiddenPreviewsBodyPlaceholder: nil, categorySummaryFormat: summaryFormat, options: [])

Hidden Previews Summary Customization

let summaryFormat = "%u more messages"
let hiddenPreviewsPlaceholder = "%u messages"
return UNNotificationCategory(identifier: "category-identifier", actions: [], intentIdentifiers: [], hiddenPreviewsBodyPlaceholder: hiddenPreviewsPlaceholder, categorySummaryFormat: summaryFormat, options: [])

let summaryFormat = "%u more messages"

let hiddenPreviewsPlaceholder = "%u messages"

return UNNotificationCategory(identifier: "category-identifier", actions: [], intentIdentifiers: [], hiddenPreviewsBodyPlaceholder: hiddenPreviewsPlaceholder, categorySummaryFormat: summaryFormat, options: [])

Notification Group Summary with Arguments

let summaryFormat = "%u more messages from %@"
return UNNotificationCategory(identifier: "group-messages", actions: [], intentIdentifiers: [], hiddenPreviewsBodyPlaceholder: nil, categorySummaryFormat: summaryFormat, options: [])

1 2	let summaryFormat = "%u more messages from %@" return UNNotificationCategory(identifier: "group-messages", actions: [], intentIdentifiers: [], hiddenPreviewsBodyPlaceholder: nil, categorySummaryFormat: summaryFormat, options: [])

Notification Group Summary Argument

let content = UNMutableNotificationContent()
content.body = "…"
content.threadIdentifier = "notify-team-ios"
content.summaryArgument = "Ashish"

let content = UNMutableNotificationContent()

content.body = "…"

content.threadIdentifier = "notify-team-ios"

content.summaryArgument = "Ashish"

Notification Summary with Argument Count

let content = UNMutableNotificationContent()
content.body = "…"
content.threadIdentifier = "notify-team-ios"
content.summaryArgument = "Ashish"
content.summaryArgumentCount = 2

let content = UNMutableNotificationContent()

content.body = "…"

content.threadIdentifier = "notify-team-ios"

content.summaryArgument = "Ashish"

content.summaryArgumentCount = 2

Updated notification payload will be like this

{
 "aps" : {
     "alert" : {
         "body" : "…",
         "summary-arg" : "Ashish",
         "summary-arg-count" : 2
     },
     "thread-id" : "notify-team-ios"
 }
}

{

"aps" : {

"alert" : {

"body" : "…",

"summary-arg" : "Ashish",

"summary-arg-count" : 2

"thread-id" : "notify-team-ios"

}

Example with local notifications:

Setup user notifications in the application.

//
//  AppDelegate.swift
//  AKGroupedNotifications
//
//  Created by Ashish Kakkad on 21/06/18.
//  Copyright © 2018 Kode. All rights reserved.
//
import UIKit
import UserNotifications
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
    var window: UIWindow?
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        let center = UNUserNotificationCenter.current()
        center.delegate = self
        let options: UNAuthorizationOptions = [.alert, .sound]
        center.requestAuthorization(options: options) {
            (granted, error) in
            if !granted {
                print("Something went wrong")
            }
        }
        center.getNotificationSettings { (settings) in
            if settings.authorizationStatus != .authorized {
                // Notifications not allowed
            }
        }
        return true
    }
}
extension AppDelegate : UNUserNotificationCenterDelegate {
    func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
        completionHandler([.alert, .sound])
    }
}

// AppDelegate.swift

// AKGroupedNotifications

// Created by Ashish Kakkad on 21/06/18.

import UIKit

import UserNotifications

@UIApplicationMain

class AppDelegate: UIResponder, UIApplicationDelegate {

var window: UIWindow?

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {

// Override point for customization after application launch.

let center = UNUserNotificationCenter.current()

center.delegate = self

let options: UNAuthorizationOptions = [.alert, .sound]

center.requestAuthorization(options: options) {

(granted, error) in

if !granted {

print("Something went wrong")

}

center.getNotificationSettings { (settings) in

if settings.authorizationStatus != .authorized {

// Notifications not allowed

}

return true

}

extension AppDelegate : UNUserNotificationCenterDelegate {

func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {

completionHandler([.alert, .sound])

}

Fire local notifications and look into the thread identifier, summary and summary count…

if #available(iOS 10.0, *) {
    for i in 1...5 {
        let content = UNMutableNotificationContent()
        content.categoryIdentifier = "AKNotification"
        content.title = "Notification \(i)"
        content.body = "\(Date())"
        if i == 2 {
            content.threadIdentifier = "ak-notingroup"
        }
        else {
            content.threadIdentifier = "ak-group-website"
            content.summaryArgumentCount = 1
            content.summaryArgument = "by ashishkakkad.com"
        }
        let trigger = UNTimeIntervalNotificationTrigger(timeInterval: TimeInterval(10*i), repeats: false)
        let request = UNNotificationRequest(identifier: "NotificationID\(i)", content: content, trigger: trigger)
        let center = UNUserNotificationCenter.current()
        center.add(request) { (error) in
            print(error?.localizedDescription ?? "")
        }
    }
}

if #available(iOS 10.0, *) {

for i in 1...5 {

let content = UNMutableNotificationContent()

content.categoryIdentifier = "AKNotification"

content.title = "Notification \(i)"

content.body = "\(Date())"

if i == 2 {

content.threadIdentifier = "ak-notingroup"

}

else {

content.threadIdentifier = "ak-group-website"

content.summaryArgumentCount = 1

content.summaryArgument = "by ashishkakkad.com"

}

let trigger = UNTimeIntervalNotificationTrigger(timeInterval: TimeInterval(10*i), repeats: false)

let request = UNNotificationRequest(identifier: "NotificationID\(i)", content: content, trigger: trigger)

let center = UNUserNotificationCenter.current()

center.add(request) { (error) in

print(error?.localizedDescription ?? "")

}

Conclusion

I know that I haven’t described anything in detail. If I get time I will update this blog with details.

Happy Coding ?

If you have any questions, comments, suggestions or feedback then contact me on Twitter @ashishkakkad8.

Apple WWDC 2018 Updates

February 7, 2021June 5, 2018 by Ashish Kakkad

Apple WWDC 2018 keynote is completed in San Jose, California. Basically this keynote is software focused keynote.
WWDC 18 Logo
Apple CEO Tim Cook announced iOS 12, macOS 10.14 Mojave, watchOS 5 and tvOS 12 with their features.

Tips for update CocoaPods and your project libraries

February 7, 2021May 21, 2018 by Ashish Kakkad

CocoaPods is a dependency manager for Swift and Objective-C Cocoa projects.

CocoaPods Logo

CocoaPods is built with Ruby and is installable with the default Ruby available on OS X. We recommend you use the default ruby.

Update your system

Update your system by following command in terminal.

$ sudo gem update --system

1	$ sudo gem update --system

Above command will install/update rubygems.

Install CocoaPods

Install CocoaPods in your system by following command in terminal.

$ sudo gem install cocoapods

1	$ sudo gem install cocoapods

If you are getting errors above command then use following command.

$ sudo gem install -n /usr/local/bin cocoapods

1	$ sudo gem install -n /usr/local/bin cocoapods

Check CocoaPods Version

$ pod --version

1	$ pod --version

Update CocoaPods Repository

We have to update CocoaPods repository with latest pod updates by developers. Use following command to update CocoaPods repository:

$ pod repo update

1	$ pod repo update

It will take some time to update all sub repositories.

Update pod for your project

If you directly apply the command pod install then some time new pods will not be updated in your project. For that you have to remove that specific pod information from the pod file and you have to apply pod install command. It will remove pod from the project. After that again you have to add the pod information in the pod file. Again you have to apply pod install command to install new version of pod.
Follow the next steps:
1. Remove SomePod from the Podfile
2. Run pod install
pods will now remove SomePod from our project and from the Podfile.lock file.
3. Put back SomePod into the Podfile
4. Run pod install again
This time the latest version of our pod will be installed and saved in the Podfile.lock.
You can update single pod file as follows:

$ pod update 'POD_NAME'

1	$ pod update 'POD_NAME'

Remove all CocoaPods from a project

Install CocoaPods deintegrate and clean commands from terminal.

$ sudo gem install cocoapods-deintegrate cocoapods-clean

1	$ sudo gem install cocoapods-deintegrate cocoapods-clean

Now you have to apply both command to remove all CocoaPods from your project:

$ pod deintegrate
$ pod clean

1 2	$ pod deintegrate $ pod clean

Happy Coding ?

List of known Xcode issues

February 7, 2021April 21, 2018 by Ashish Kakkad

Xcode is IDE for development of the iOS, macOS, tvOS and watchOS applications. Every year apple comes up with so many changes in this IDE. Xcode 9.3 released on March 29, 2018.
knownxcodeissues

Here, I am listing out all the issues with the workaround.

How to use Alamofire with Codable in Swift?

February 7, 2021March 5, 2018 by Ashish Kakkad

Hello after long time I am writing this blog regarding use of Alamofire with Codable model object for the ease of MVC architecture.
Let’s rewind with some of the post which is used to cover this point:

Let see about use of Alamofire with Codable model object

Step 1 – Create Codable object based on JSON response.

Here I am taking an example of a web service which contains JSON related to the contact.

{
 "id": "c200",
 "name": "Ravi Tamada",
 "email": "ravi@gmail.com",
 "address": "xx-xx-xxxx,x - street, x - country",
 "gender" : "male",
 "phone": {
 "mobile": "+91 0000000000",
 "home": "00 000000",
 "office": "00 000000"
 }
}

{

"id": "c200",

"name": "Ravi Tamada",

"email": "ravi@gmail.com",

"address": "xx-xx-xxxx,x - street, x - country",

"gender" : "male",

"phone": {

"mobile": "+91 0000000000",

"home": "00 000000",

"office": "00 000000"

}

So, we can create two Codable files from this JSON as per hierarchy. These would be like as follows:

struct Contact: Codable {
 var id : String
 var name : String
 var email : String
 var address : String
 var gender : String
 var phone : Phone
}
struct Phone: Codable {
 var mobile : String
 var home : String
 var office : String
}

struct Contact: Codable {

var id : String

var name : String

var email : String

var address : String

var gender : String

var phone : Phone

}

struct Phone: Codable {

var mobile : String

var home : String

var office : String

}

As you can see we have created 2 objects Contact and Phone. Here Phone is in sub hierarchy.

Step 2 – Let’s update AFWrapper

As we have previously revised blogs, there is a blog mentioned about to create a wrapper of the Alamofire and SwiftyJSON. We have to replace the SwiftyJSON code to return normal dictionary objects, and after that we will convert that dictionary to the Codable object.
So here I have updated the AFWrapper class file to do that thing:

import UIKit
import Alamofire
class AFWrapper: NSObject {
    class func requestGETURL(_ strURL: String, success:@escaping ([String : Any]) -&gt; Void, failure:@escaping (Error) -&gt; Void) {
        Alamofire.request(strURL).responseJSON { (responseObject) -&gt; Void in
            print(responseObject)
            if responseObject.result.isSuccess {
                success(responseObject.result.value! as! [String : Any])
            }
            if responseObject.result.isFailure {
                let error : Error = responseObject.result.error!
                failure(error)
            }
        }
    }
}

import UIKit

import Alamofire

class AFWrapper: NSObject {

class func requestGETURL(_ strURL: String, success:@escaping ([String : Any]) -> Void, failure:@escaping (Error) -> Void) {

Alamofire.request(strURL).responseJSON { (responseObject) -> Void in

print(responseObject)

if responseObject.result.isSuccess {

success(responseObject.result.value! as! [String : Any])

}

if responseObject.result.isFailure {

let error : Error = responseObject.result.error!

failure(error)

}

Step 3 – Implement and convert the response in object

We will call a web service which contain that kind of JSON response. And after calling the web-service we will decode the object to create the Codable object.

import UIKit
class ViewController: UIViewController {
    var arrContacts = [Contact]()
    @IBOutlet var txtContacts: UITextView!
    override func viewDidLoad() {
        super.viewDidLoad()
        AFWrapper.requestGETURL("https://api.androidhive.info/contacts/", success: { (responseObject) in
            print(responseObject)
            for aContact in responseObject["contacts"] as! [Any] {
                do {
                    let jsonData = try JSONSerialization.data(withJSONObject: aContact, options: .prettyPrinted)
                    let reqJSONStr = String(data: jsonData, encoding: .utf8)
                    let data = reqJSONStr?.data(using: .utf8)
                    let jsonDecoder = JSONDecoder()
                    let aContact = try jsonDecoder.decode(Contact.self, from: data!)
                    self.arrContacts.append(aContact)
                    self.txtContacts.text = self.txtContacts.text + aContact.name + " " + aContact.phone.mobile + "\n"
                    print(self.arrContacts)
                }
                catch {
                }
            }
        }) { (error) in
            print(error.localizedDescription)
        }
    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
}

import UIKit

class ViewController: UIViewController {

var arrContacts = [Contact]()

@IBOutlet var txtContacts: UITextView!

override func viewDidLoad() {

super.viewDidLoad()

AFWrapper.requestGETURL("https://api.androidhive.info/contacts/", success: { (responseObject) in

print(responseObject)

for aContact in responseObject["contacts"] as! [Any] {

do {

let jsonData = try JSONSerialization.data(withJSONObject: aContact, options: .prettyPrinted)

let reqJSONStr = String(data: jsonData, encoding: .utf8)

let data = reqJSONStr?.data(using: .utf8)

let jsonDecoder = JSONDecoder()

let aContact = try jsonDecoder.decode(Contact.self, from: data!)

self.arrContacts.append(aContact)

self.txtContacts.text = self.txtContacts.text + aContact.name + " " + aContact.phone.mobile + "\n"

print(self.arrContacts)

}

catch {

}

}) { (error) in

print(error.localizedDescription)

}

override func didReceiveMemoryWarning() {

super.didReceiveMemoryWarning()

// Dispose of any resources that can be recreated.

}

In above sample I have added one text view in the view controller and I am fetching the data from the contacts API. After that using JSONSerialization and JSONDecoder we will get our decoded Contact object with Phone object.

Conclusion

Swift 4 comes with so many updates. We are going to have a great time exploring them all and finding out so much more by using it on further projects. We have learned about Codable and use of it. You too should go check it out and share your experiences with us in the comments section.
Hope you liked the article.
Happy Coding 🙂