Swift: Add attributed string in iOS

let attributsBold = [NSAttributedString.Key.font: UIFont.systemFont(ofSize: 13.0, weight: .bold),
		 NSAttributedString.Key.foregroundColor: UIColor.AppPrimaryColor]
let attributsNormal = [NSAttributedString.Key.font: UIFont.systemFont(ofSize: 13.0, weight: .regular),
		   NSAttributedString.Key.foregroundColor: UIColor.AppSlate]
let attributedString = NSMutableAttributedString(string: "Bold Text", attributes:attributsBold)
let boldStringPart = NSMutableAttributedString(string: "Regular Text", attributes:attributsNormal)

attributedString.append(boldStringPart)

UITextViewObject.attributedText = attributedString

let attributsBold = [NSAttributedString.Key.font: UIFont.systemFont(ofSize: 13.0, weight: .bold),

NSAttributedString.Key.foregroundColor: UIColor.AppPrimaryColor]

let attributsNormal = [NSAttributedString.Key.font: UIFont.systemFont(ofSize: 13.0, weight: .regular),

NSAttributedString.Key.foregroundColor: UIColor.AppSlate]

let attributedString = NSMutableAttributedString(string: "Bold Text", attributes:attributsBold)

let boldStringPart = NSMutableAttributedString(string: "Regular Text", attributes:attributsNormal)

attributedString.append(boldStringPart)

UITextViewObject.attributedText = attributedString

shubham sharma December 27, 2019 Read More

Open Google map

First method: In Android

String uri = String.format(Locale.ENGLISH, "geo:%f,%f", latitude, longitude);
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(uri));
context.startActivity(intent);

String uri = String.format(Locale.ENGLISH, "geo:%f,%f", latitude, longitude);

Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(uri));

context.startActivity(intent);

EDIT: This might not work with Google maps 7,0 hence you could change the URI to : Second option:

String geoUri = "http://maps.google.com/maps?q=loc:" + lat + "," + lng + " (" + Location Name + ")";

1	String geoUri = "http://maps.google.com/maps?q=loc:" + lat + "," + lng + " (" + Location Name + ")";

Third option:

geo:0,0?q=FullAddress

1	geo:0,0?q=FullAddress

Fourth option:

String map = "http://maps.google.co.in/maps?q=" + FullAddress;

1	String map = "http://maps.google.co.in/maps?q=" + FullAddress;

shubham sharma August 8, 2019 Read More

Difference between Singleton vs Static

1) The static class provides better performance than the Singleton pattern because static methods are bonded on compile time. 2) One more difference between Singleton and static is the ability to override. Since static methods in Java cannot be overridden, they lead to inflexibility. On the other hand, you can override methods defined in Singleton class […]

shubham sharma August 1, 2019 Read More

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 Custom Dialog

ViewController Where you need to open dialog

import UIKit

class CusomDialogViewController: UIViewController, DialogDeligate {

    @IBOutlet weak var dialogValue: UILabel!
    
    // Init dialogVC
    fileprivate let dialogVC = DialogViewController()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        //set delegate
        dialogVC.delegate = self 
        dialogVC.dialogTitle = "Custom Title"
        //Add Dialog in current VC
        addDialogVC()
    }
    
    fileprivate func addDialogVC() {
        // 2- Add Dialog as a child view
        self.addChild(dialogVC)
        self.view.addSubview(dialogVC.view)
        dialogVC.didMove(toParent: self)
        
        // 3- Adjust Dialog frame and initial position.
        let height = view.frame.height
        let width  = view.frame.width
        dialogVC.view.frame = CGRect(origin: CGPoint(x:0, y:self.view.frame.maxY), size: CGSize(width:width, height:height))
    }
    @IBAction func openDialog(_ sender: Any) {
        dialogVC.open()
    }
    

    //Impliment delegate function which returns user entered string from dialog
    func submit(value: String?) {
        dialogValue.text = value
    }

}

import UIKit

class CusomDialogViewController: UIViewController, DialogDeligate {

@IBOutlet weak var dialogValue: UILabel!

// Init dialogVC

fileprivate let dialogVC = DialogViewController()

override func viewDidLoad() {

super.viewDidLoad()

//set delegate

dialogVC.delegate = self

dialogVC.dialogTitle = "Custom Title"

//Add Dialog in current VC

addDialogVC()

}

fileprivate func addDialogVC() {

// 2- Add Dialog as a child view

self.addChild(dialogVC)

self.view.addSubview(dialogVC.view)

dialogVC.didMove(toParent: self)

// 3- Adjust Dialog frame and initial position.

let height = view.frame.height

let width = view.frame.width

dialogVC.view.frame = CGRect(origin: CGPoint(x:0, y:self.view.frame.maxY), size: CGSize(width:width, height:height))

}

@IBAction func openDialog(_ sender: Any) {

dialogVC.open()

}

//Impliment delegate function which returns user entered string from dialog

func submit(value: String?) {

dialogValue.text = value

}

Dialog ViewController

import UIKit


//Create protocol for callback if you wants to pass
//some data from dialog
protocol DialogDeligate {
    func submit(value:String?)
}
class DialogViewController: UIViewController {
    
    @IBOutlet weak var _dialogTitle: UILabel!
    @IBOutlet weak var userValue: UITextField!
    
    var dialogTitle:String = "Dialog Title"
    
    var delegate:DialogDeligate?
    
    override func viewDidLoad() {
        super.viewDidLoad()
        _dialogTitle.text = dialogTitle
    }
    
    @IBAction func didTapClose(_ sender: Any) {
        close()
        
    }
    @IBAction func didTapSubmit(_ sender: Any) {
        delegate?.submit(value: userValue.text)
        close()
    }
    
    func open(){ 
        UIView.animate(withDuration: 0.3) { [weak self] in
            let frame = self?.view.frame
            let yComponent = 0//UIScreen.main.bounds.height  //- 300
            self?.view.frame = CGRect(origin: CGPoint(x:0, y:yComponent), size: CGSize(width:frame!.width, height:frame!.height))
        }
    }
    
    fileprivate func close() {
        UIView.animate(withDuration: 0.3) { [weak self] in
            let frame = self?.view.frame
            let yComponent = UIScreen.main.bounds.height  //- 300
            self?.view.frame = CGRect(origin: CGPoint(x:0, y:yComponent), size: CGSize(width:frame!.width, height:frame!.height))
        }
    }
    
}

import UIKit

//Create protocol for callback if you wants to pass

//some data from dialog

protocol DialogDeligate {

func submit(value:String?)

}

class DialogViewController: UIViewController {

@IBOutlet weak var _dialogTitle: UILabel!

@IBOutlet weak var userValue: UITextField!

var dialogTitle:String = "Dialog Title"

var delegate:DialogDeligate?

override func viewDidLoad() {

super.viewDidLoad()

_dialogTitle.text = dialogTitle

}

@IBAction func didTapClose(_ sender: Any) {

close()

}

@IBAction func didTapSubmit(_ sender: Any) {

delegate?.submit(value: userValue.text)

close()

}

func open(){

UIView.animate(withDuration: 0.3) { [weak self] in

let frame = self?.view.frame

let yComponent = 0//UIScreen.main.bounds.height //- 300

self?.view.frame = CGRect(origin: CGPoint(x:0, y:yComponent), size: CGSize(width:frame!.width, height:frame!.height))

}

fileprivate func close() {

UIView.animate(withDuration: 0.3) { [weak self] in

let frame = self?.view.frame

let yComponent = UIScreen.main.bounds.height //- 300

self?.view.frame = CGRect(origin: CGPoint(x:0, y:yComponent), size: CGSize(width:frame!.width, height:frame!.height))

}

Download Project

shubham sharma June 24, 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

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Drag and Drop using swift 4 on mac OS