How can I write this so that it updates the variable when the user finishes using the field (for Cocoa?). The aim is to allow the user to specify a custom IP address for the TV's location on the network.
import Cocoa
import Alamofire
class ViewController: NSViewController, NSTextFieldDelegate {
#IBAction func MenuButton(_ sender: NSButtonCell) {
triggerRemoteControl(irccc: "AAAAAQAAAAEAAABgAw==")
}
#IBAction func ReturnButton(_ sender: NSButton) {
triggerRemoteControl(irccc: "AAAAAgAAAJcAAAAjAw==")
}
…
#IBOutlet var IPField: NSTextField! // [A] Set by the user
…
func triggerRemoteControl(irccc: String) {
Alamofire.request(IPField, // [B] Goes here when it's updated.
method: .post,
parameters: ["parameter" : "value"],
encoding: SOAPEncoding(service: "urn:schemas-sony-com:service:IRCC:1",
action: "X_SendIRCC", IRCCC: irccc)).responseString { response in
print(response)
}
}
}
— UPDATE
I tried declaring a variable:
var IPString: String
and then (I set the textField's delegate to ViewController, and placed this function inside):
override func controlTextDidEndEditing(_ obj: Notification){
let IPString = IPField.stringValue
}
Even using the "-> String" and return notation still has it complaining about unused variables. I obviously don't know my Syntax well enough.
Complier also complains about not the ViewController not being initialised.
What you need is to override the func controlTextDidEndEditing(_ obj: Notification) function
You should take a look at:
object (property of obj) - sometimes you would like to know which object sent you the end editing action.
userInfo (property of obj) - contains a "NSTextMovement" key, which allows you to define how the user did end the editing.
override func controlTextDidEndEditing(_ obj: Notification){
let IPString = IPField.stringValue
}
Here, you're creating new constant. What you want is to set this value into your class variable, so you should make IPString = IPField.stringValue
But it's not quite correct, because func controlTextDidEndEditing(_ obj: Notification) could be called from other objects, so first you should check if obj notification contain object which send it with guard, for example.
guard let object = obj.object else {
return
}
Then check if object is your IPField with identity operators
guard object === IPField else {
return
}
And finally you can assign your field value to your IPString var
IPString = object.stringValue
Hope it will help you. Ohh and one advice from my side, you should use lower camel case naming convention for you variables.
Related
I'm programmatically adding a UITapGestureRecognizer to one of my views:
let gesture = UITapGestureRecognizer(target: self, action: #selector(self.handleTap(modelObj:myModelObj)))
self.imageView.addGestureRecognizer(gesture)
func handleTap(modelObj: Model) {
// Doing stuff with model object here
}
The first problem I encountered was "Argument of '#selector' does not refer to an '#Objc' method, property, or initializer.
Cool, so I added #objc to the handleTap signature:
#objc func handleTap(modelObj: Model) {
// Doing stuff with model object here
}
Now I'm getting the error "Method cannot be marked #objc because the type of the parameter cannot be represented in Objective-C.
It's just an image of the map of a building, with some pin images indicating the location of points of interest. When the user taps one of these pins I'd like to know which point of interest they tapped, and I have a model object which describes these points of interest. I use this model object to give the pin image it's coordinates on the map so I thought it would have been easy for me to just send the object to the gesture handler.
It looks like you're misunderstanding a couple of things.
When using target/action, the function signature has to have a certain form…
func doSomething()
or
func doSomething(sender: Any)
or
func doSomething(sender: Any, forEvent event: UIEvent)
where…
The sender parameter is the control object sending the action message.
In your case, the sender is the UITapGestureRecognizer
Also, #selector() should contain the func signature, and does NOT include passed parameters. So for…
func handleTap(sender: UIGestureRecognizer) {
}
you should have…
let gesture = UITapGestureRecognizer(target: self, action: #selector(handleTap(sender:)))
Assuming the func and the gesture are within a view controller, of which modelObj is a property / ivar, there's no need to pass it with the gesture recogniser, you can just refer to it in handleTap
Step 1: create the custom object of the sender.
step 2: add properties you want to change in that a custom object of the sender
step 3: typecast the sender in receiving function to a custom object and access those properties
For eg:
on click of the button if you want to send the string or any custom object then
step 1: create
class CustomButton : UIButton {
var name : String = ""
var customObject : Any? = nil
var customObject2 : Any? = nil
convenience init(name: String, object: Any) {
self.init()
self.name = name
self.customObject = object
}
}
step 2-a: set the custom class in the storyboard as well
step 2-b: Create IBOutlet of that button with a custom class as follows
#IBOutlet weak var btnFullRemote: CustomButton!
step 3: add properties you want to change in that a custom object of the sender
btnFullRemote.name = "Nik"
btnFullRemote.customObject = customObject
btnFullRemote.customObject2 = customObject2
btnFullRemote.addTarget(self, action: #selector(self.btnFullRemote(_:)), for: .touchUpInside)
step 4: typecast the sender in receiving function to a custom object and access those properties
#objc public func btnFullRemote(_ sender: Any) {
var name : String = (sender as! CustomButton).name as? String
var customObject : customObject = (sender as! CustomButton).customObject as? customObject
var customObject2 : customObject2 = (sender as! CustomButton).customObject2 as? customObject2
}
Swift 5.0 iOS 13
I concur a great answer by Ninad. Here is my 2 cents, the same and yet different technique; a minimal version.
Create a custom class, throw a enum to keep/make the code as maintainable as possible.
enum Vs: String {
case pulse = "pulse"
case precision = "precision"
}
class customTap: UITapGestureRecognizer {
var cutomTag: String?
}
Use it, making sure you set the custom variable into the bargin. Using a simple label here, note the last line, important labels are not normally interactive.
let precisionTap = customTap(target: self, action: #selector(VC.actionB(sender:)))
precisionTap.customTag = Vs.precision.rawValue
precisionLabel.addGestureRecognizer(precisionTap)
precisionLabel.isUserInteractionEnabled = true
And setup the action using it, note I wanted to use the pure enum, but it isn't supported by Objective C, so we go with a basic type, String in this case.
#objc func actionB(sender: Any) {
// important to cast your sender to your cuatom class so you can extract your special setting.
let tag = customTag as? customTap
switch tag?.sender {
case Vs.pulse.rawValue:
// code
case Vs.precision.rawValue:
// code
default:
break
}
}
And there you have it.
cell.btn.tag = indexPath.row //setting tag
cell.btn.addTarget(self, action: #selector(showAlert(_ :)), for: .touchUpInside)
#objc func showAlert(_ sender: UIButton){
print("sender.tag is : \(sender.tag)")// getting tag's value
}
Just create a custom class of UITapGestureRecognizer =>
import UIKit
class OtherUserProfileTapGestureRecognizer: UITapGestureRecognizer {
let userModel: OtherUserModel
init(target: AnyObject, action: Selector, userModel: OtherUserModel) {
self.userModel = userModel
super.init(target: target, action: action)
}
}
And then create UIImageView extension =>
import UIKit
extension UIImageView {
func gotoOtherUserProfile(otherUserModel: OtherUserModel) {
isUserInteractionEnabled = true
let gestureRecognizer = OtherUserProfileTapGestureRecognizer(target: self, action: #selector(self.didTapOtherUserImage(_:)), otherUserModel: otherUserModel)
addGestureRecognizer(gestureRecognizer)
}
#objc internal func didTapOtherUserImage(_ recognizer: OtherUserProfileTapGestureRecognizer) {
Router.shared.gotoOtherUserProfile(otherUserModel: recognizer.otherUserModel)
}
}
Now use it like =>
self.userImageView.gotoOtherUserProfile(otherUserModel: OtherUserModel)
You can use an UIAction instead:
self.imageView.addAction(UIAction(identifier: UIAction.Identifier("imageClick")) { [weak self] action in
self?.handleTap(modelObj)
}, for: .touchUpInside)
that may be a terrible practice but I simply add whatever I want to restore to
button.restorationIdentifier = urlString
and
#objc func openRelatedFact(_ sender: Any) {
if let button = sender as? UIButton, let stringURL = factButton.restorationIdentifier, let url = URL(string: stringURL) {
if UIApplication.shared.canOpenURL(url) {
UIApplication.shared.open(url, options: [:])
}
}
}
I've created a variable in one IBAction which saves a string, and I want to be able to call that variable in another IBAction in the same file. How do I define the variable globally so that the other IBAction can call it?
The variable message comes from a UIAlertController output, which appears when pressing a button on the View Controller.
#IBAction func EditMessage(_ sender: Any) {
let message = Message(message: text)
}
#IBAction func PostArticle(_ sender: Any) {
let parameters = ["title": "subheading", "content": "\(message)"]
}
Trying to call the message variable from the other IBAction will only give the error:
Use of unresolved identifier 'message'
class MyViewController : UIViewController {
var message = ""
#IBAction func EditMessage(_ sender: Any) {
message = Message(message: text)
}
#IBAction func PostArticle(_ sender: Any) {
let parameters = ["title": "subheading", "content": "\(message)"]
}
}
Hope it Helps.
Make your message variable be accessible to the two IBActions.
Your Message function should return a string
Message(message: String) -> String {
// Do something here
return "sample"
}
Read Swift Function
I created a question a few days ago and was provided with protocol on how to solve an issue of passing data back and forth . I have also looked at some tutorials and have created a protocol but it is not working or even hitting the breakpoint from what I can see it should be working. I have created a protocol for my AVPlayer so that on tap it could get a new video but like i said it's not even hitting the breakpoint this is my code...
protocol CustomAVPLayerProtocol: class {
func reloadTabled(at index: Int)
}
class CustomAVPLayerC: AVPlayerViewController {
var delagate: CustomAVPLayerProtocol?
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
self.delagate?.reloadTabled(at: 1)
for touch in touches {
self.delagate?.reloadTabled(at: 1)
print("Tapped")
// When I tap the AVPlayer this print statement shows
// So I know it is coming here
}
}
}
Now This is my second class/controller
class BookViewC: UIViewController, CustomAVPLayerProtocol {
override func viewDidLoad() {
super.viewDidLoad()
PlayVideo(250, "url")
}
func reloadTabled(at index: Int) {
print("This protocol method does not execute or hit breakpoint")
self.PlayVideo(250, "url")
}
func PlayVideo(MediaHeight: Float, MediaURL: String) {
let movieURL = URL(string: MediaURL)
videoCapHeight.constant = CGFloat(MediaHeight)
streamsModel.playerView = AVPlayer(url: movieURL!)
streamsModel.MyAVPlayer.player = streamsModel.playerView
streamsModel.MyAVPlayer.videoGravity = AVLayerVideoGravity.resizeAspectFill.rawValue
streamsModel.MyAVPlayer.showsPlaybackControls = false
streamsModel.MyAVPlayer.view.frame = VideoView.bounds
VideoView.addSubview(streamsModel.MyAVPlayer.view)
self.addChildViewController(streamsModel.MyAVPlayer)
streamsModel.playerView?.isMuted = false
streamsModel.MyAVPlayer.player?.play()
}
}
As I stated before it is not even hitting the breakpoint on BookViewC.reloadTabled as suggestions would be great
As per your code these are some minor mistakes which you can correct to make it work.
1. `weak var delagate: CustomAVPLayerProtocol?`
*Make a weak delegate to save it from retaining a strong reference cycle and memory leaks.*
2. Code Snippet:
func PlayVideo {
let customPlayer = CustomAVPLayerC()
customPlayer.delegate = self
}
in Your Second ViewController, You need to assign your delegate to an object / view controller to make ie respond to
NOTE: In case you require, you can make a super class that conforms the your protocol class, so that your every view controller conforms it automatically, you just need to assign an delegate to class on which you want to use it.
You have the foundation set up correctly but remember that classes are (mostly) just blueprints for instances. These classes are useless until you create instances of them because it’s the instances that will do the work.
Therefore, simply pass one instance as the delegate of the other, which you can do here because you've correctly set up the protocol.
protocol CustomAVPLayerProtocol: AnyObject {
func reloadTabled(at index: Int)
}
class CustomAVPLayerC: AVPlayerViewController {
weak var delagate: CustomAVPLayerProtocol?
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
self.delagate?.reloadTabled(at: 1)
for touch in touches {
self.delagate?.reloadTabled(at: 1)
print("Tapped")
}
}
}
class BookViewC: UIViewController, CustomAVPLayerProtocol {
override func viewDidLoad() {
super.viewDidLoad()
PlayVideo(250, "url")
}
func reloadTabled(at index: Int) {
PlayVideo(250, "url")
}
func PlayVideo(_ MediaHeight: Float, _ MediaURL: String) {
//
}
}
let book = BookViewC()
let layer = CustomAVPLayerC()
layer.delagate = book
Where you do this instantiation/delegation is up to you. Also, I know that a lot of people here use class to define protocols that only conform to classes, but Swift's documentation instructs us to use AnyObject.
Protocols are the most common means used by unrelated objects to communicate with each other. As per the above code, the communication did not seem to happen.
Your protocol declaration part seems alright. The problem exists in the secondViewController. I can see that you have not set the delegate to the object that's been created. Ideally, it has to be something like this:
Class BookViewC: UIViewController, CustomAVPLayerProtocol {
override func viewDidLoad() {
super.viewDidLoad()
PlayVideo(250, "url")
}
You need to the set the delegate here:
func PlayVideo {
let customPlayer = CustomAVPLayerC()
customPlayer.delegate = self //This makes the selector to respond
}
I'm programmatically adding a UITapGestureRecognizer to one of my views:
let gesture = UITapGestureRecognizer(target: self, action: #selector(self.handleTap(modelObj:myModelObj)))
self.imageView.addGestureRecognizer(gesture)
func handleTap(modelObj: Model) {
// Doing stuff with model object here
}
The first problem I encountered was "Argument of '#selector' does not refer to an '#Objc' method, property, or initializer.
Cool, so I added #objc to the handleTap signature:
#objc func handleTap(modelObj: Model) {
// Doing stuff with model object here
}
Now I'm getting the error "Method cannot be marked #objc because the type of the parameter cannot be represented in Objective-C.
It's just an image of the map of a building, with some pin images indicating the location of points of interest. When the user taps one of these pins I'd like to know which point of interest they tapped, and I have a model object which describes these points of interest. I use this model object to give the pin image it's coordinates on the map so I thought it would have been easy for me to just send the object to the gesture handler.
It looks like you're misunderstanding a couple of things.
When using target/action, the function signature has to have a certain form…
func doSomething()
or
func doSomething(sender: Any)
or
func doSomething(sender: Any, forEvent event: UIEvent)
where…
The sender parameter is the control object sending the action message.
In your case, the sender is the UITapGestureRecognizer
Also, #selector() should contain the func signature, and does NOT include passed parameters. So for…
func handleTap(sender: UIGestureRecognizer) {
}
you should have…
let gesture = UITapGestureRecognizer(target: self, action: #selector(handleTap(sender:)))
Assuming the func and the gesture are within a view controller, of which modelObj is a property / ivar, there's no need to pass it with the gesture recogniser, you can just refer to it in handleTap
Step 1: create the custom object of the sender.
step 2: add properties you want to change in that a custom object of the sender
step 3: typecast the sender in receiving function to a custom object and access those properties
For eg:
on click of the button if you want to send the string or any custom object then
step 1: create
class CustomButton : UIButton {
var name : String = ""
var customObject : Any? = nil
var customObject2 : Any? = nil
convenience init(name: String, object: Any) {
self.init()
self.name = name
self.customObject = object
}
}
step 2-a: set the custom class in the storyboard as well
step 2-b: Create IBOutlet of that button with a custom class as follows
#IBOutlet weak var btnFullRemote: CustomButton!
step 3: add properties you want to change in that a custom object of the sender
btnFullRemote.name = "Nik"
btnFullRemote.customObject = customObject
btnFullRemote.customObject2 = customObject2
btnFullRemote.addTarget(self, action: #selector(self.btnFullRemote(_:)), for: .touchUpInside)
step 4: typecast the sender in receiving function to a custom object and access those properties
#objc public func btnFullRemote(_ sender: Any) {
var name : String = (sender as! CustomButton).name as? String
var customObject : customObject = (sender as! CustomButton).customObject as? customObject
var customObject2 : customObject2 = (sender as! CustomButton).customObject2 as? customObject2
}
Swift 5.0 iOS 13
I concur a great answer by Ninad. Here is my 2 cents, the same and yet different technique; a minimal version.
Create a custom class, throw a enum to keep/make the code as maintainable as possible.
enum Vs: String {
case pulse = "pulse"
case precision = "precision"
}
class customTap: UITapGestureRecognizer {
var cutomTag: String?
}
Use it, making sure you set the custom variable into the bargin. Using a simple label here, note the last line, important labels are not normally interactive.
let precisionTap = customTap(target: self, action: #selector(VC.actionB(sender:)))
precisionTap.customTag = Vs.precision.rawValue
precisionLabel.addGestureRecognizer(precisionTap)
precisionLabel.isUserInteractionEnabled = true
And setup the action using it, note I wanted to use the pure enum, but it isn't supported by Objective C, so we go with a basic type, String in this case.
#objc func actionB(sender: Any) {
// important to cast your sender to your cuatom class so you can extract your special setting.
let tag = customTag as? customTap
switch tag?.sender {
case Vs.pulse.rawValue:
// code
case Vs.precision.rawValue:
// code
default:
break
}
}
And there you have it.
cell.btn.tag = indexPath.row //setting tag
cell.btn.addTarget(self, action: #selector(showAlert(_ :)), for: .touchUpInside)
#objc func showAlert(_ sender: UIButton){
print("sender.tag is : \(sender.tag)")// getting tag's value
}
Just create a custom class of UITapGestureRecognizer =>
import UIKit
class OtherUserProfileTapGestureRecognizer: UITapGestureRecognizer {
let userModel: OtherUserModel
init(target: AnyObject, action: Selector, userModel: OtherUserModel) {
self.userModel = userModel
super.init(target: target, action: action)
}
}
And then create UIImageView extension =>
import UIKit
extension UIImageView {
func gotoOtherUserProfile(otherUserModel: OtherUserModel) {
isUserInteractionEnabled = true
let gestureRecognizer = OtherUserProfileTapGestureRecognizer(target: self, action: #selector(self.didTapOtherUserImage(_:)), otherUserModel: otherUserModel)
addGestureRecognizer(gestureRecognizer)
}
#objc internal func didTapOtherUserImage(_ recognizer: OtherUserProfileTapGestureRecognizer) {
Router.shared.gotoOtherUserProfile(otherUserModel: recognizer.otherUserModel)
}
}
Now use it like =>
self.userImageView.gotoOtherUserProfile(otherUserModel: OtherUserModel)
You can use an UIAction instead:
self.imageView.addAction(UIAction(identifier: UIAction.Identifier("imageClick")) { [weak self] action in
self?.handleTap(modelObj)
}, for: .touchUpInside)
that may be a terrible practice but I simply add whatever I want to restore to
button.restorationIdentifier = urlString
and
#objc func openRelatedFact(_ sender: Any) {
if let button = sender as? UIButton, let stringURL = factButton.restorationIdentifier, let url = URL(string: stringURL) {
if UIApplication.shared.canOpenURL(url) {
UIApplication.shared.open(url, options: [:])
}
}
}
I am new to OS X app development. I manage to built the NSComboBox (Selectable, not editable), I can get it indexOfSelectedItem on action button click, working fine.
How to detect the the value on change? When user change their selection, what kind of function I shall use to detect the new selected index?
I tried to use the NSNotification but it didn't pass the new change value, always is the default value when load. It is because I place the postNotificationName in wrong place or there are other method should use to get the value on change?
I tried searching the net, video, tutorial but mostly written for Objective-C. I can't find any answer for this in SWIFT.
import Cocoa
class NewProjectSetup: NSViewController {
let comboxRouterValue: [String] = ["No","Yes"]
#IBOutlet weak var projNewRouter: NSComboBox!
#IBAction func btnAddNewProject(sender: AnyObject) {
let comBoxID = projNewRouter.indexOfSelectedItem
print(“Combo Box ID is: \(comBoxID)”)
}
#IBAction func btnCancel(sender: AnyObject) {
self.dismissViewController(self)
}
override func viewDidLoad() {
super.viewDidLoad()
addComboxValue(comboxRouterValue,myObj:projNewRouter)
self.projNewRouter.selectItemAtIndex(0)
let notificationCenter = NSNotificationCenter.defaultCenter()
notificationCenter.addObserver(
self,
selector: “testNotication:”,
name:"NotificationIdentifier",
object: nil)
NSNotificationCenter.defaultCenter().postNotificationName("NotificationIdentifier", object: projNewRouter.indexOfSelectedItem)
}
func testNotication(notification: NSNotification){
print("Found Combo ID \(notification.object)")
}
func addComboxValue(myVal:[String],myObj:AnyObject){
let myValno: Int = myVal.count
for var i = 0; i < myValno; ++i{
myObj.addItemWithObjectValue(myVal[i])
}
}
}
You need to define a delegate for the combobox that implements the NSComboBoxDelegate protocol, and then use the comboBoxSelectionDidChange(_:) method.
The easiest method is for your NewProjectSetup class to implement the delegate, as in:
class NewProjectSetup: NSViewController, NSComboBoxDelegate { ... etc
Then in viewDidLoad, also include:
self.projNewRouter.delegate = self
// self (ie. NewProjectSetup) implements NSComboBoxDelegate
And then you can pick up the change in:
func comboBoxSelectionDidChange(notification: NSNotification) {
print("Woohoo, it changed")
}