iOS

iOS Info.plist Usage Description

Check out this developer.apple.com link for the full list of property list key references. Full List: Apple Music:

<key>NSAppleMusicUsageDescription</key>
<string>My description about why I need this capability</string>

1 2	<key>NSAppleMusicUsageDescription</key> <string>My description about why I need this capability</string>

Bluetooth:

<key>NSBluetoothPeripheralUsageDescription</key>  
<string>My description about why I need this capability</string>

1 2	<key>NSBluetoothPeripheralUsageDescription</key> <string>My description about why I need this capability</string>

Calendar:

<span class="tag"><key></span><span class="pln">NSCalendarsUsageDescription</span><span class="tag"></key></span>
<span class="tag"><string></span><span class="pln">My description about why I need this capability</span><span class="tag"></string></span>

1 2	<span class="tag"><key></span><span class="pln">NSCalendarsUsageDescription</span><span class="tag"></key></span> <span class="tag"><string></span><span class="pln">My description about why I need this capability</span><span class="tag"></string></span>

Camera:

<span class="tag"><key></span><span class="pln">NSCameraUsageDescription</span><span class="tag"></key></span>
<span class="tag"><string></span><span class="pln">My description about why I need this capability</span><span class="tag"></string></span>

1 2	<span class="tag"><key></span><span class="pln">NSCameraUsageDescription</span><span class="tag"></key></span> <span class="tag"><string></span><span class="pln">My description about why I need this capability</span><span class="tag"></string></span>

Contacts:

<span class="tag"><key></span><span class="pln">NSContactsUsageDescription</span><span class="tag"></key></span>
<span class="tag"><string></span><span class="pln">My description about why I need this capability</span><span class="tag"></string></span>

1 2	<span class="tag"><key></span><span class="pln">NSContactsUsageDescription</span><span class="tag"></key></span> <span class="tag"><string></span><span class="pln">My description about why I need this capability</span><span class="tag"></string></span>

FaceID:

<span class="tag"><key></span><span class="pln">NSFaceIDUsageDescription</span><span class="tag"></key></span>
<span class="tag"><string></span><span class="pln">My description about why I need this capability</span><span class="tag"></string></span>

1 2	<span class="tag"><key></span><span class="pln">NSFaceIDUsageDescription</span><span class="tag"></key></span> <span class="tag"><string></span><span class="pln">My description about why I need this capability</span><span class="tag"></string></span>

Health Share:

<span class="tag"><key></span><span class="pln">NSHealthShareUsageDescription</span><span class="tag"></key></span>
<span class="tag"><string></span><span class="pln">My description about why I need this capability</span><span class="tag"></string></span>

1 2	<span class="tag"><key></span><span class="pln">NSHealthShareUsageDescription</span><span class="tag"></key></span> <span class="tag"><string></span><span class="pln">My description about why I need this capability</span><span class="tag"></string></span>

Health Update:

<span class="tag"><key></span><span class="pln">NSHealthUpdateUsageDescription</span><span class="tag"></key></span>
<span class="tag"><string></span><span class="pln">My description about why I need this capability</span><span class="tag"></string></span>

1 2	<span class="tag"><key></span><span class="pln">NSHealthUpdateUsageDescription</span><span class="tag"></key></span> <span class="tag"><string></span><span class="pln">My description about why I need this capability</span><span class="tag"></string></span>

Home Kit:

<span class="tag"><key></span><span class="pln">NSHomeKitUsageDescription</span><span class="tag"></key></span>
<span class="tag"><string></span><span class="pln">My description about why I need this capability</span><span class="tag"></string></span>

1 2	<span class="tag"><key></span><span class="pln">NSHomeKitUsageDescription</span><span class="tag"></key></span> <span class="tag"><string></span><span class="pln">My description about why I need this capability</span><span class="tag"></string></span>

Location:

<span class="tag"><key></span><span class="pln">NSLocationUsageDescription</span><span class="tag"></key></span>
<span class="tag"><string></span><span class="pln">My description about why I need this capability</span><span class="tag"></string></span>

1 2	<span class="tag"><key></span><span class="pln">NSLocationUsageDescription</span><span class="tag"></key></span> <span class="tag"><string></span><span class="pln">My description about why I need this capability</span><span class="tag"></string></span>

Location (Always):

<span class="tag"><key></span><span class="pln">NSLocationAlwaysUsageDescription</span><span class="tag"></key></span>
<span class="tag"><string></span><span class="pln">My description about why I need this capability</span><span class="tag"></string></span>

1 2	<span class="tag"><key></span><span class="pln">NSLocationAlwaysUsageDescription</span><span class="tag"></key></span> <span class="tag"><string></span><span class="pln">My description about why I need this capability</span><span class="tag"></string></span>

Location (When in use):

<span class="tag"><key></span><span class="pln">NSLocationWhenInUseUsageDescription</span><span class="tag"></key></span>
<span class="tag"><string></span><span class="pln">My description about why I need this capability</span><span class="tag"></string></span>

1 2	<span class="tag"><key></span><span class="pln">NSLocationWhenInUseUsageDescription</span><span class="tag"></key></span> <span class="tag"><string></span><span class="pln">My description about why I need this capability</span><span class="tag"></string></span>

Microphone:

<span class="tag"><key></span><span class="pln">NSMicrophoneUsageDescription</span><span class="tag"></key></span>
<span class="tag"><string></span><span class="pln">My description about why I need this capability</span><span class="tag"></string></span>

1 2	<span class="tag"><key></span><span class="pln">NSMicrophoneUsageDescription</span><span class="tag"></key></span> <span class="tag"><string></span><span class="pln">My description about why I need this capability</span><span class="tag"></string></span>

Motion (Accelerometer):

<span class="tag"><key></span><span class="pln">NSMotionUsageDescription</span><span class="tag"></key></span>
<span class="tag"><string></span><span class="pln">My description about why I need this capability</span><span class="tag"></string></span>

1 2	<span class="tag"><key></span><span class="pln">NSMotionUsageDescription</span><span class="tag"></key></span> <span class="tag"><string></span><span class="pln">My description about why I need this capability</span><span class="tag"></string></span>

NFC (Near-field communication):

<span class="tag"><key></span><span class="pln">NFCReaderUsageDescription</span><span class="tag"></key></span>
<span class="tag"><string></span><span class="pln">My description about why I need this capability</span><span class="tag"></string></span>

1 2	<span class="tag"><key></span><span class="pln">NFCReaderUsageDescription</span><span class="tag"></key></span> <span class="tag"><string></span><span class="pln">My description about why I need this capability</span><span class="tag"></string></span>

Photo Library: […]

shubham sharma July 19, 2019 Read More

Swift Date format refrence

Characters Example Description Year y 2008 Year, no padding yy 08 Year, two digits (padding with a zero if necessary) yyyy 2008 Year, minimum of four digits (padding with zeros if necessary) Quarter Q 4 The quarter of the year. Use QQ if you want zero padding. QQQ Q4 Quarter including “Q” QQQQ 4th quarter […]

shubham sharma July 4, 2019 Read More

iOS Date picker view

import UIKit

class ViewController: UIViewController {
    
    @IBOutlet weak var textField: UITextField!
    
    fileprivate var tmpSelectedDate:String = ""
    
    override func viewDidLoad() {
        super.viewDidLoad()
        pickerViewInit()
        // Do any additional setup after loading the view.
    }
}

extension ViewController  {
    
    //MARK:pickerView
    //*****************************************************
    func pickerViewInit(){
        //Create a parent view for UIPickerView
        let pickerViewWrpper = UIView(frame: CGRect(x:0, y: 200, width: self.view.bounds.width, height: 200))
        pickerViewWrpper.backgroundColor = .clear
        
        //create UIPickerView object
        let datepicker = UIDatePicker( )
        
        datepicker.backgroundColor = .clear
        //add UIPickerView into parent view
        pickerViewWrpper.addSubview(datepicker)
        
        datepicker.datePickerMode = UIDatePicker.Mode.date
        
        //add some constraint to UIPickerView
        datepicker.translatesAutoresizingMaskIntoConstraints = false
        datepicker.leadingAnchor.constraint(equalTo: pickerViewWrpper.leadingAnchor, constant: 0).isActive = true
        datepicker.trailingAnchor.constraint(equalTo: pickerViewWrpper.trailingAnchor, constant: 0).isActive = true
        datepicker.bottomAnchor.constraint(equalTo: pickerViewWrpper.bottomAnchor, constant: 0).isActive = true
        datepicker.heightAnchor.constraint(equalToConstant: 170).isActive = true
        datepicker.addTarget(self, action: #selector(dateChanged(_:)), for: .valueChanged)
        //set data source and other stuff
        
        
        //create UIToolbar object
        let toolBar = UIToolbar()
        
        //add UIToolbar into parent view
        pickerViewWrpper.addSubview(toolBar)
        //add some constraint to UIToolbar
        toolBar.translatesAutoresizingMaskIntoConstraints = false
        toolBar.leadingAnchor.constraint(equalTo: pickerViewWrpper.leadingAnchor, constant: 0).isActive = true
        toolBar.trailingAnchor.constraint(equalTo: pickerViewWrpper.trailingAnchor, constant: 0).isActive = true
        toolBar.topAnchor.constraint(equalTo: pickerViewWrpper.topAnchor, constant: 0).isActive = true
        toolBar.heightAnchor.constraint(equalToConstant: 30).isActive = true
        
        
        //add some style to UIToolbar
        toolBar.barStyle = UIBarStyle.default
        toolBar.isTranslucent = true
        //        toolBar.tintColor = UIColor(red: 76/255, green: 217/255, blue: 100/255, alpha: 1)
        toolBar.sizeToFit()
        
        //int done and cancelButton buttons
        let doneButton = UIBarButtonItem(title: "Select", style: UIBarButtonItem.Style.plain, target: self, action: #selector(donePicker))
        let spaceButton = UIBarButtonItem(barButtonSystemItem: UIBarButtonItem.SystemItem.flexibleSpace, target: nil, action: nil)
        let cancelButton = UIBarButtonItem(title: "Cancel", style: UIBarButtonItem.Style.plain, target: self, action: #selector(cancelPicker))
        
        toolBar.setItems([cancelButton, spaceButton, doneButton], animated: false)
        toolBar.isUserInteractionEnabled = true
        
        
        //set inputView when we enter in text field this view will show insted of keyboard
        textField.inputView = pickerViewWrpper
    }
    
    @objc func donePicker(){
        textField.resignFirstResponder()
        textField.text = tmpSelectedDate
    }
    @objc func cancelPicker(){
        textField.resignFirstResponder()
    }
    @objc func dateChanged(_ sender: UIDatePicker) {
        
        let dateFormatter = DateFormatter()
        dateFormatter.dateFormat = "dd/MM/yyyy"
        tmpSelectedDate = dateFormatter.string(from: sender.date)
        
        
        //Uncomment if user wants to update text field date same time when user change date
        //        childDOB.text = dateFormatter.string(from: sender.date)
        
    }
    //*****************************************************
    //End pickerView
    
}

import UIKit

class ViewController: UIViewController {

@IBOutlet weak var textField: UITextField!

fileprivate var tmpSelectedDate:String = ""

override func viewDidLoad() {

super.viewDidLoad()

pickerViewInit()

// Do any additional setup after loading the view.

}

extension ViewController {

//MARK:pickerView

//*****************************************************

func pickerViewInit(){

//Create a parent view for UIPickerView

let pickerViewWrpper = UIView(frame: CGRect(x:0, y: 200, width: self.view.bounds.width, height: 200))

pickerViewWrpper.backgroundColor = .clear

//create UIPickerView object

let datepicker = UIDatePicker( )

datepicker.backgroundColor = .clear

//add UIPickerView into parent view

pickerViewWrpper.addSubview(datepicker)

datepicker.datePickerMode = UIDatePicker.Mode.date

//add some constraint to UIPickerView

datepicker.translatesAutoresizingMaskIntoConstraints = false

datepicker.leadingAnchor.constraint(equalTo: pickerViewWrpper.leadingAnchor, constant: 0).isActive = true

datepicker.trailingAnchor.constraint(equalTo: pickerViewWrpper.trailingAnchor, constant: 0).isActive = true

datepicker.bottomAnchor.constraint(equalTo: pickerViewWrpper.bottomAnchor, constant: 0).isActive = true

datepicker.heightAnchor.constraint(equalToConstant: 170).isActive = true

datepicker.addTarget(self, action: #selector(dateChanged(_:)), for: .valueChanged)

//set data source and other stuff

//create UIToolbar object

let toolBar = UIToolbar()

//add UIToolbar into parent view

pickerViewWrpper.addSubview(toolBar)

//add some constraint to UIToolbar

toolBar.translatesAutoresizingMaskIntoConstraints = false

toolBar.leadingAnchor.constraint(equalTo: pickerViewWrpper.leadingAnchor, constant: 0).isActive = true

toolBar.trailingAnchor.constraint(equalTo: pickerViewWrpper.trailingAnchor, constant: 0).isActive = true

toolBar.topAnchor.constraint(equalTo: pickerViewWrpper.topAnchor, constant: 0).isActive = true

toolBar.heightAnchor.constraint(equalToConstant: 30).isActive = true

//add some style to UIToolbar

toolBar.barStyle = UIBarStyle.default

toolBar.isTranslucent = true

// toolBar.tintColor = UIColor(red: 76/255, green: 217/255, blue: 100/255, alpha: 1)

toolBar.sizeToFit()

//int done and cancelButton buttons

let doneButton = UIBarButtonItem(title: "Select", style: UIBarButtonItem.Style.plain, target: self, action: #selector(donePicker))

let spaceButton = UIBarButtonItem(barButtonSystemItem: UIBarButtonItem.SystemItem.flexibleSpace, target: nil, action: nil)

let cancelButton = UIBarButtonItem(title: "Cancel", style: UIBarButtonItem.Style.plain, target: self, action: #selector(cancelPicker))

toolBar.setItems([cancelButton, spaceButton, doneButton], animated: false)

toolBar.isUserInteractionEnabled = true

//set inputView when we enter in text field this view will show insted of keyboard

textField.inputView = pickerViewWrpper

}

@objc func donePicker(){

textField.resignFirstResponder()

textField.text = tmpSelectedDate

}

@objc func cancelPicker(){

textField.resignFirstResponder()

}

@objc func dateChanged(_ sender: UIDatePicker) {

let dateFormatter = DateFormatter()

dateFormatter.dateFormat = "dd/MM/yyyy"

tmpSelectedDate = dateFormatter.string(from: sender.date)

//Uncomment if user wants to update text field date same time when user change date

// childDOB.text = dateFormatter.string(from: sender.date)

}

//*****************************************************

//End pickerView

}

shubham sharma June 11, 2019 Read More

MAC Os / iOS check network is connected or not

import CommonCrypto
import SystemConfiguration

...

public class NetworkReachability {
    
    public static func isConnectedToNetwork() -> Bool {
        var zeroAddress = sockaddr_in()
        zeroAddress.sin_len = UInt8(MemoryLayout<sockaddr_in>.size)
        zeroAddress.sin_family = sa_family_t(AF_INET)
        
        guard let defaultRouteReachability = withUnsafePointer(to: &zeroAddress, {
            $0.withMemoryRebound(to: sockaddr.self, capacity: 1) {
                SCNetworkReachabilityCreateWithAddress(nil, $0)
            }
        }) else {
            return false
        }
        
        var flags: SCNetworkReachabilityFlags = []
        if !SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags) {
            return false
        }
        if flags.isEmpty {
            return false
        }
        
        let isReachable = flags.contains(.reachable)
        let needsConnection = flags.contains(.connectionRequired)
        
        return (isReachable && !needsConnection)
    }
    
}

import CommonCrypto

import SystemConfiguration

...

public class NetworkReachability {

public static func isConnectedToNetwork() -> Bool {

var zeroAddress = sockaddr_in()

zeroAddress.sin_len = UInt8(MemoryLayout<sockaddr_in>.size)

zeroAddress.sin_family = sa_family_t(AF_INET)

guard let defaultRouteReachability = withUnsafePointer(to: &zeroAddress, {

$0.withMemoryRebound(to: sockaddr.self, capacity: 1) {

SCNetworkReachabilityCreateWithAddress(nil, $0)

}

}) else {

return false

}

var flags: SCNetworkReachabilityFlags = []

if !SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags) {

return false

}

if flags.isEmpty {

return false

}

let isReachable = flags.contains(.reachable)

let needsConnection = flags.contains(.connectionRequired)

return (isReachable && !needsConnection)

}

shubham sharma May 21, 2019 Read More

Swift on OS X. How to handle global mouse events?

You are correct about using addGlobalMonitorForEventsMatchingMask:handler: A simple example might look something like this: AppDelegate.swift

class AppDelegate: NSObject, NSApplicationDelegate {

    @IBOutlet weak var window: NSWindow!
    @IBOutlet var textLabel : NSTextField!
    var eventHandler : GlobalEventMonitor?
    var gecount : Int = 0

    func applicationDidFinishLaunching(aNotification: NSNotification) {

        eventHandler = GlobalEventMonitor(mask: .LeftMouseDownMask, handler: { (mouseEvent: NSEvent?) in
        self.gecount += 1
        self.textLabel.stringValue = "global event monitor: \(self.gecount)"
    })
    eventHandler?.start()
  }
}

class AppDelegate: NSObject, NSApplicationDelegate {

@IBOutlet weak var window: NSWindow!

@IBOutlet var textLabel : NSTextField!

var eventHandler : GlobalEventMonitor?

var gecount : Int = 0

func applicationDidFinishLaunching(aNotification: NSNotification) {

eventHandler = GlobalEventMonitor(mask: .LeftMouseDownMask, handler: { (mouseEvent: NSEvent?) in

self.gecount += 1

self.textLabel.stringValue = "global event monitor: \(self.gecount)"

})

eventHandler?.start()

}

GlobalEventMonitor.swift

public class GlobalEventMonitor {

    private var monitor: AnyObject?
    private let mask: NSEventMask
    private let handler: NSEvent? -> ()

    public init(mask: NSEventMask, handler: NSEvent? -> ()) {
        self.mask = mask
        self.handler = handler
    }

    deinit {
        stop()
    }

    public func start() {
        monitor = NSEvent.addGlobalMonitorForEventsMatchingMask(mask, handler: handler)
    }

    public func stop() {
        if monitor != nil {
            NSEvent.removeMonitor(monitor!)
            monitor = nil
        }
    }
}

public class GlobalEventMonitor {

private var monitor: AnyObject?

private let mask: NSEventMask

private let handler: NSEvent? -> ()

public init(mask: NSEventMask, handler: NSEvent? -> ()) {

self.mask = mask

self.handler = handler

}

deinit {

stop()

}

public func start() {

monitor = NSEvent.addGlobalMonitorForEventsMatchingMask(mask, handler: handler)

}

public func stop() {

if monitor != nil {

NSEvent.removeMonitor(monitor!)

monitor = nil

}

shubham sharma April 17, 2019 Read More

Drag and Drop using swift 4 on mac OS

class DropView: NSView {
    
    var filePath: String?
    let expectedExt = ["jpg", "png", "jpeg"]  //file extensions allowed for Drag&Drop (example: "jpg","png","docx", etc..)
    
    required init?(coder: NSCoder) {
        super.init(coder: coder)
        
        self.wantsLayer = true
        self.layer?.backgroundColor = NSColor.gray.cgColor
        
        registerForDraggedTypes([NSPasteboard.PasteboardType.URL, NSPasteboard.PasteboardType.fileURL])
    }
    
    override func draw(_ dirtyRect: NSRect) {
        super.draw(dirtyRect)
        // Drawing code here.
    }
    
    override func draggingEntered(_ sender: NSDraggingInfo) -> NSDragOperation {
        if checkExtension(sender) == true {
            self.layer?.backgroundColor = NSColor.blue.cgColor
            return .copy
        } else {
            return NSDragOperation()
        }
    }
    
    fileprivate func checkExtension(_ drag: NSDraggingInfo) -> Bool {
        guard let board = drag.draggingPasteboard.propertyList(forType: NSPasteboard.PasteboardType(rawValue: "NSFilenamesPboardType")) as? NSArray,
            let path = board[0] as? String
            else { return false }
        
        let suffix = URL(fileURLWithPath: path).pathExtension
        for ext in self.expectedExt {
            if ext.lowercased() == suffix {
                return true
            }
        }
        return false
    }
    
    override func draggingExited(_ sender: NSDraggingInfo?) {
        self.layer?.backgroundColor = NSColor.gray.cgColor
    }
    
    override func draggingEnded(_ sender: NSDraggingInfo) {
        self.layer?.backgroundColor = NSColor.gray.cgColor
    }
    
    override func performDragOperation(_ sender: NSDraggingInfo) -> Bool {
        guard let pasteboard = sender.draggingPasteboard.propertyList(forType: NSPasteboard.PasteboardType(rawValue: "NSFilenamesPboardType")) as? NSArray,
            let path = pasteboard[0] as? String
            else { return false }
        
        //GET YOUR FILE PATH !!!
        self.filePath = path
        Swift.print("FilePath: \(path)")
        
        return true
    }
}

class DropView: NSView {

var filePath: String?

let expectedExt = ["jpg", "png", "jpeg"] //file extensions allowed for Drag&Drop (example: "jpg","png","docx", etc..)

required init?(coder: NSCoder) {

super.init(coder: coder)

self.wantsLayer = true

self.layer?.backgroundColor = NSColor.gray.cgColor

registerForDraggedTypes([NSPasteboard.PasteboardType.URL, NSPasteboard.PasteboardType.fileURL])

}

override func draw(_ dirtyRect: NSRect) {

super.draw(dirtyRect)

// Drawing code here.

}

override func draggingEntered(_ sender: NSDraggingInfo) -> NSDragOperation {

if checkExtension(sender) == true {

self.layer?.backgroundColor = NSColor.blue.cgColor

return .copy

} else {

return NSDragOperation()

}

fileprivate func checkExtension(_ drag: NSDraggingInfo) -> Bool {

guard let board = drag.draggingPasteboard.propertyList(forType: NSPasteboard.PasteboardType(rawValue: "NSFilenamesPboardType")) as? NSArray,

let path = board[0] as? String

else { return false }

let suffix = URL(fileURLWithPath: path).pathExtension

for ext in self.expectedExt {

if ext.lowercased() == suffix {

return true

}

return false

}

override func draggingExited(_ sender: NSDraggingInfo?) {

self.layer?.backgroundColor = NSColor.gray.cgColor

}

override func draggingEnded(_ sender: NSDraggingInfo) {

self.layer?.backgroundColor = NSColor.gray.cgColor

}

override func performDragOperation(_ sender: NSDraggingInfo) -> Bool {

guard let pasteboard = sender.draggingPasteboard.propertyList(forType: NSPasteboard.PasteboardType(rawValue: "NSFilenamesPboardType")) as? NSArray,

let path = pasteboard[0] as? String

else { return false }

//GET YOUR FILE PATH !!!

self.filePath = path

Swift.print("FilePath: \(path)")

return true

}

shubham sharma April 16, 2019 Read More

Track mouse movement Mac

class ViewController: NSViewController {

    @IBOutlet weak var xview: NSView!

    override func viewDidLoad() {
        super.viewDidLoad()
        xview.wantsLayer = true
    }

    //1.
    var isPresentingSlideshow = false
    @IBAction func toggle(_ sender: Any) {

        if(isPresentingSlideshow) {
            isPresentingSlideshow = false
            xview.layer?.backgroundColor = NSColor.green.cgColor
            teardownTracking()
        }
        else {
            isPresentingSlideshow = true
            xview.layer?.backgroundColor = NSColor.red.cgColor
            setupTracking()
        }
    }

    //2.
    var trackingArea:NSTrackingArea?
    func setupTracking() {
        let area = NSTrackingArea(rect: xview.bounds, options: [.activeAlways,.mouseEnteredAndExited,.mouseMoved,.inVisibleRect]  , owner: self, userInfo: nil)
        xview.addTrackingArea(area)
        trackingArea = area
    }

    //3.
    func teardownTracking() {
        if let trackingArea = trackingArea {
            xview.removeTrackingArea(trackingArea)
            self.trackingArea = nil
            NSCursor.setHiddenUntilMouseMoves(false)
        }
    }

    //4.
    var cursorHideState = false
    override func mouseMoved(with event: NSEvent) {
        super.mouseMoved(with: event)

        if !cursorHideState {
            cursorHideState = true
            //5.
            DispatchQueue.main.asyncAfter(deadline: .now() + 2.0) {
                [weak self] in
                if let _ = self?.trackingArea {
                    NSCursor.setHiddenUntilMouseMoves(true)
                    self?.cursorHideState = false
                }
            }
        }
    }

}

class ViewController: NSViewController {

@IBOutlet weak var xview: NSView!

override func viewDidLoad() {

super.viewDidLoad()

xview.wantsLayer = true

}

//1.

var isPresentingSlideshow = false

@IBAction func toggle(_ sender: Any) {

if(isPresentingSlideshow) {

isPresentingSlideshow = false

xview.layer?.backgroundColor = NSColor.green.cgColor

teardownTracking()

}

else {

isPresentingSlideshow = true

xview.layer?.backgroundColor = NSColor.red.cgColor

setupTracking()

}

//2.

var trackingArea:NSTrackingArea?

func setupTracking() {

let area = NSTrackingArea(rect: xview.bounds, options: [.activeAlways,.mouseEnteredAndExited,.mouseMoved,.inVisibleRect] , owner: self, userInfo: nil)

xview.addTrackingArea(area)

trackingArea = area

}

//3.

func teardownTracking() {

if let trackingArea = trackingArea {

xview.removeTrackingArea(trackingArea)

self.trackingArea = nil

NSCursor.setHiddenUntilMouseMoves(false)

}

//4.

var cursorHideState = false

override func mouseMoved(with event: NSEvent) {

super.mouseMoved(with: event)

if !cursorHideState {

cursorHideState = true

//5.

DispatchQueue.main.asyncAfter(deadline: .now() + 2.0) {

[weak self] in

if let _ = self?.trackingArea {

NSCursor.setHiddenUntilMouseMoves(true)

self?.cursorHideState = false

}

What going on here is. Simple toggle action to flip between playing/not-playing state and reflect that in the color state. Adds a NSTrackingArea to the view. The owner is this view controller so it will receive the mouseMoved: event. The option .mouseMoved is required to set this up. Removes the tracking area from the view when the slide show […]

shubham sharma April 8, 2019 Read More

Swift Multi-Threading

1- The Main Queue 2- The Global Queue: 3- Custom Queues:

DispatchQueue.main.async {
   ...
}

DispatchQueue.main.async {

...

}

DispatchQueue.global(qos: .background).async {
...
}

DispatchQueue.global(qos: .background).async {

...

}

let concurrentQueue = DispatchQueue(label: "queuename", attributes: .concurrent)
concurrentQueue.sync {
...
}  <span style="font-family: inherit; font-size: inherit;"> </span>

let concurrentQueue = DispatchQueue(label: "queuename", attributes: .concurrent)

concurrentQueue.sync {

...

} <span style="font-family: inherit; font-size: inherit;"> </span>

highest priority 1- userInteractive : Work is virtually instantaneous. Similar to main thread. 2- userInitiated : Work is nearly instantaneous, such as a few seconds or less. 3- default: don’t use it usually , the type will be inferred by the system 4- utility: Work takes a few seconds to a few […]

shubham sharma April 6, 2019 Read More

Difference between Structure vs class in swift

Here’s an example with a class. Note how when the name is changed, the instance referenced by both variables is updated. Bob is now Sue, everywhere that Bob was ever referenced.

class SomeClass {
    var name: String
    init(name: String) {
        self.name = name
    }
}

var aClass = SomeClass(name: "Bob")
var bClass = aClass // aClass and bClass now reference the same instance!
bClass.name = "Sue"

println(aClass.name) // "Sue"
println(bClass.name) // "Sue"

class SomeClass {

var name: String

init(name: String) {

self.name = name

}

var aClass = SomeClass(name: "Bob")

var bClass = aClass // aClass and bClass now reference the same instance!

bClass.name = "Sue"

println(aClass.name) // "Sue"

println(bClass.name) // "Sue"

And now with a struct we see that the values are copied and each variable keeps it’s own set of values. When we set the name to Sue, the Bob struct in aStruct does not […]

shubham sharma March 26, 2019 Read More

Swift: Dictionary And Json operations

If you need to convert JSON string into a dictionary or a dictionary into JSON String

import Foundation

class JsonOperation {
    public static func toJsonStringFrom(dictionary: [String:Any]) -> NSString? {
        let jsonData = try! JSONSerialization.data(withJSONObject: dictionary)
        let jsonString = NSString(data: jsonData, encoding: String.Encoding.utf8.rawValue)
        return jsonString
    }
    public static func toJsonStringFrom(array: [String]) -> NSString? {
        let jsonData = try! JSONSerialization.data(withJSONObject: array)
        let jsonString = NSString(data: jsonData, encoding: String.Encoding.utf8.rawValue)
        return jsonString
    }
    static func toDictionaryFrom(string: String) -> [String: Any]? {
        if let data = string.data(using: .utf8) {
            do {
                return try JSONSerialization.jsonObject(with: data, options: []) as? [String: Any]
            } catch {
                print(error.localizedDescription)
            }
        }
        return nil
    }
}

import Foundation

class JsonOperation {

public static func toJsonStringFrom(dictionary: [String:Any]) -> NSString? {

let jsonData = try! JSONSerialization.data(withJSONObject: dictionary)

let jsonString = NSString(data: jsonData, encoding: String.Encoding.utf8.rawValue)

return jsonString

}

public static func toJsonStringFrom(array: [String]) -> NSString? {

let jsonData = try! JSONSerialization.data(withJSONObject: array)

let jsonString = NSString(data: jsonData, encoding: String.Encoding.utf8.rawValue)

return jsonString

}

static func toDictionaryFrom(string: String) -> [String: Any]? {

if let data = string.data(using: .utf8) {

do {

return try JSONSerialization.jsonObject(with: data, options: []) as? [String: Any]

} catch {

print(error.localizedDescription)

}

return nil

}

shubham sharma March 18, 2019 Read More

New Dev Point

Some problems explained

iOS

iOS Info.plist Usage Description

Swift Date format refrence

iOS Date picker view

MAC Os / iOS check network is connected or not

Swift on OS X. How to handle global mouse events?

Drag and Drop using swift 4 on mac OS

Track mouse movement Mac

Swift Multi-Threading

Difference between Structure vs class in swift

Swift: Dictionary And Json operations