I'm using Xcode 8 and swift 3.
I have the following error on line "let action":
#selector' refers to a method that is not exposed to Objective-C
Any suggestion ?
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cellWaze", for: indexPath) as! WazeTableViewCell
// Configure the cell...
cell.lbAgence.text = aWAgence[indexPath.row][0] as? String
let cellLat :Double = aWAgence[indexPath.row][1] as! Double
let cellLong :Double = aWAgence[indexPath.row][2] as! Double
cell.bWaze.tag = indexPath.row
let action = #selector(LaunchWaze(cellLat,longitude: cellLong))
cell.bWaze.addTarget(self, action: action, for: .touchUpInside)
return cell
}
#objc func LaunchWaze(_ latitude: Double, longitude: Double) {
if UIApplication.shared.canOpenURL(NSURL(string: "waze://")! as URL) {
// Waze is installed. Launch Waze and start navigation
var urlStr = "waze://?ll=\(latitude),\(longitude)&navigate=yes"
print("url : \(urlStr)")
//UIApplication.shared.openURL(NSURL(string: urlStr)!)
}
else {
// Waze is not installed. Launch AppStore to install Waze app
UIApplication.shared.openURL(NSURL(string: "http://itunes.apple.com/us/app/id323229106")! as URL)
}
}
Try to inherit NSObject to your class.
class YourClass {
...
}
to
class YourClass: NSObject {
...
}
You cannot include actual parameters into selectors.
And the method for action target can take only three forms:
UIControl
Listing 1 Action method definitions
#IBAction func doSomething()
#IBAction func doSomething(_ sender: UIButton)
#IBAction func doSomething(_ sender: UIButton, forEvent event: UIEvent)
(I added _ before sender, but it is not mandatory, just you need to create a consistent selector. UIButton can be any appropriate UIControl subclass, or just Any if you do not think of what it should be. #IBAction can be replaced with #objc when adding the method programatically, in many cases, which is implicitly added.)
So, if you want to pass some info to the action method, you need to put it in sender or use some intermediate instance properties.
In your case, a quick fix would be something like this.
The selector should be:
let action = #selector(launchWaze(_:))
And the method:
#objc func launchWaze(_ sender: UIControl) {
let latitude: Double = aWAgence[sender.tag][1] as! Double
let longitude: Double = aWAgence[sender.tag][2] as! Double
//...
}
Related
I have a button that needs to open a web view on another controller in modally. currently the button executes the code you see below. I would like the button to open the webview directly. the link changes because it is an rss reader and therefore, based on the cell pressed, changes the link of the button that must open the webview.
this is the code that manages the controller that appears after the cell has been pressed
class FeedItemWebViewController: UIViewController, UIWebViewDelegate {
#IBOutlet weak var textView: UITextView!
var link: String? = nil
var descriptionTesto:String? = nil
override func viewDidLoad() {
super.viewDidLoad()
self.textView.text = descriptionTesto
}
#IBAction func apri(_ sender: UIBarButtonItem) {
guard let url = URL(string: self.link ?? "") else { return }
UIApplication.shared.open(url, options: [:], completionHandler: nil)
}
}
here is where it manages the controller where I entered the webview
class OpenSafariController: UIViewController, UIWebViewDelegate {
#IBOutlet weak var myWebView: UIWebView!
override func viewDidLoad() {
super.viewDidLoad()
}
#IBAction func ritornaLista(_ sender: UIBarButtonItem) {
self.presentingViewController?.presentingViewController?.dismiss(animated: false, completion: nil)
}
}
delete the webview controller that is not needed. import SafariServices. here is the code to put on the button
#IBAction func apri(_ sender: UIBarButtonItem) {
let svc = SFSafariViewController(url: URL(string: self.link ?? "")!)
self.present(svc, animated: true, completion: nil)
}
I have a Xib file trying to set it up with my storyboard. Everything in the Xib file is fine, but for some reason, it's not showing. I imported a file from GitHub which is set to my Xib, it's in Objective-C and I set the bridging, no errors. But when I run it nothing shows its blank. Did I not set something in the View Controller? Everything is done programmatically and I just set the class in storyboard.
Screenshot of storyboard:
What the simulator gives me when I push to the ViewController:
This is what I'm supposed to see:
What I am trying to implement -
https://github.com/jberlana/JBCroppableView
My XIB class
import UIKit
class CropViewXIB: UIView {
#IBOutlet weak var ImageView: JBCroppableImageView!
#IBAction func SubAction(_ sender: Any) {
ImageView.removePoint()
}
#IBAction func AddAction(_ sender: Any) {
ImageView.addPoint()
}
#IBAction func UndoAction(_ sender: Any) {
ImageView.reverseCrop()
}
#IBAction func CropAction(_ sender: Any) {
ImageView.crop()
}
override init(frame: CGRect) {
super.init(frame: frame)
commomInit()
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
commomInit()
}
private func commomInit(){
Bundle.main.loadNibNamed("CropViewXIB", owner: self, options: nil)
self.addSubview(ImageView)
ImageView.frame = self.bounds
ImageView.autoresizingMask = [.flexibleHeight, .flexibleWidth]
}
}
my view controller
import UIKit
class ViewController: UIViewController {
#IBOutlet weak var cropView: CropViewXIB!
override func viewDidLoad() {
super.viewDidLoad()
}
}
The issue is that you didn't actually get the parent view for your UINib object.
Bundle.main.loadNibNamed("CropViewXIB", owner: self, options: nil)
The line above returns an [Any] in your case you aren't even using the view that it is returning. so the idea is to get the first object from it and cast it as UIView such as:
Bundle.main.loadNibNamed("CropViewXIB", owner: self, options: nil)?.first as? UIView
Personally this is how I interact with a Nib. I create a view property of type UIView that can be referred as the parent view for the nib, and all subviews get added to it instead of self.
Something like this:
final class SomeNibView: UIView {
public var view: UIView!
private func setup() { // called to the initializer
// grab the views from loadNibNamed
guard let _view = Bundle.main.loadNibNamed("name", owner: self, options: nil)?.first as? UIView else { return }
// set it to our view property
view = _view
// add this property to the nib subview aka self
addSubview(view)
view.autoresizingMask = [.flexibleWidth, .flexibleHeight]
}
private func addMulitpleSubviews() {
// instead of doing self.addSubview(....) when it comes to add other subviews
// you'll do this view.addSubview(....)
}
}
Try to load xib using programming not using storyboard.
override func viewDidLoad()
{
super.viewDidLoad()
guard let yourXIB = Bundle.main.loadNibNamed("CropViewXIB", owner: self, options: nil)?.first as? CropViewXIB else { return}
self.view.addSubview(yourXIB)
}
Two view controllers:
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if (sender as! cell1).name.text == "ww"{
let s = segue.destination as! DetailViewController
s.detail?.text = "wwwwwwwwwww"
}
}
I am new to coding. What I am trying here is to communicate between view controllers. For some reason, I am not able to show the wwwwwwwwwww in the label of the second view controller
At the prepare function the view hasn't been loaded yet from storyboard, so the outlets of the DetailViewController are still nil.
Create a public variable in the DetailViewController which will be available at prepare, then in the viewDidLoad method of DetailViewController you can set the label's text to be the content of that variable.
class DetailViewController: UIViewController {
var text: String?
override function viewDidLoad() {
super.viewDidLoad()
label.text = text
}
}
Then in your list viewcontroller set the text property of detail vc:
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
guard (sender as! cell1).name.text == "ww",
let detailVc = segue.destination as? DetailViewController
else { return }
detailVc.text = "wwwwwwwwwww"
}
Is it not possible to use both of these at the same time. Originally, I have overriden (Swift) touchesBegan/Moved/Ended in my ViewController.
Now, I'm wanting to add a TapGestureRecognizer to certain views under a certain situation, but the selector/action never gets fired.
class ViewController: UIViewController, UIGestureRecognizerDelegate {
...
func addTapGesturesOnNumberPadDisplay() {
if tapGestureRecognizerNumberPadView == nil {
tapGestureRecognizerNumberPadView = UITapGestureRecognizer(target: self, action: "handleTap:")
tapGestureRecognizerNumberPadView!.delegate = self
self.numberViewDone?.addGestureRecognizer(tapGestureRecognizerNumberPadView!)
}
}
...
func handleTap(sender: UITapGestureRecognizer) {
//never hit
Is this not possible? Should I just implement my own tapping ability in touchesBegan since I'm overriding it anyway, or is there a way to also use a tapGestureRecognizer here?
Since you have overriden touchesBegan/Moved/Ended in viewcontroller it should not have any impact on tap gestures in other subviews. Ideally it should work. Please check code below, works as expected.
class ViewController: UIViewController, UIGestureRecognizerDelegate {
#IBOutlet weak var categoryScrollView: UIScrollView!
var customView: UIView!
var tapGestureRecognizerNumberPadView : UITapGestureRecognizer?
override func viewDidLoad() {
super.viewDidLoad()
customView = UIView()
customView.frame.origin = CGPointMake(50,50)
customView.frame.size = CGSizeMake(100, 100)
customView.backgroundColor = UIColor.blueColor()
self.view.addSubview(customView)
addTapGesturesOnNumberPadDisplay()
}
func addTapGesturesOnNumberPadDisplay() {
if tapGestureRecognizerNumberPadView == nil {
tapGestureRecognizerNumberPadView = UITapGestureRecognizer(target: self, action: "handleTap:")
tapGestureRecognizerNumberPadView!.delegate = self
self.customView?.addGestureRecognizer(tapGestureRecognizerNumberPadView!)
}
}
func handleTap(sender: UITapGestureRecognizer) {
print("handleTap")
}
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
}
override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) {
}
override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {
}
}
Please check is there any other gestures to 'numberViewDone' view.
My setup:
`UITableViewController` (ComboViewController)
-> Several Static Cells
-> One Static Cell contains a dynamic `tableView`
I need to use a custom Delegate/DataSource because the dynamic tableView is embedded in the Static TableView within the TableViewController
This custom Delegate/DataSource looks like this:
class DataSource: NSObject, UITableViewDataSource, UITableViewDelegate {
// class variables
override init() {
super.init()
// initialize variables
}
//some data source/ delegate methods like number of rows, cellForRowAtIndexPath
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
var indexedCombos: NSDictionary?
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let comboVC: ComboInfoViewController = storyboard.instantiateViewControllerWithIdentifier("ComboInfo") as! ComboInfoViewController
comboVC.doSegue()
}
}
Within ComboViewController I have this:
class ComboInfoViewController: UITableViewController {
func doSegue() {
self.performSegueWithIdentifier("tosingle", sender: combListTable)
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "tosingle" {
//do stuff
}
}
}
If the segue is modal I get this error:
Warning: Attempt to present SingleProductViewController on ComboInfoViewController whose view is not in the window hierarchy!
If the segue is push, then the prepareForSegue method gets called, but the viewController does not push! What is happening?
I've searched and searched. But I have no idea what could be resulting in this behavior.
When you create the ComboInfoViewController instance with this line,
let comboVC: ComboInfoViewController = storyboard.instantiateViewControllerWithIdentifier("ComboInfo") as! ComboInfoViewController
You're creating a new instance that is not the one you have on screen, and never will be, so that's why you get the error. It is very important that you understand this concept; understanding how view controllers are created, and how to get pointers to ones that already exist is fundamental to iOS programming.
However, in this case you don't even need to get a pointer to the one on screen, because you should connect the segue directly from the cell (the dynamic prototype), which means you won't need any code to execute it. You can delete the didSelectRowAtIndexPath method, and the doSegue method. You only need to implement prepareForSegue. If you need to pass information to the next controller based one which row was touched, you can do it like below. The table view controller code should now look like this (this is an update of the code in my answer to this question, Swift: TableView within Static UITableViewCell),
class ComboInfoViewController: UITableViewController {
#IBOutlet weak var staticTableView: UITableView!
#IBOutlet weak var dynamicTableView: UITableView!
var dataSource = DataSource()
override func viewDidLoad() {
super.viewDidLoad()
dynamicTableView.dataSource = dataSource
dynamicTableView.delegate = dataSource
}
override func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
if indexPath.row != 1 {
return 44
}else{
return 250 // the second cell has the dynamic table view in it
}
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "tosingle" {
var cell = sender as! UITableViewCell
var indexPath = dynamicTableView.indexPathForCell(cell)
var dataPoint = dataSource.theData[indexPath!.row] // theData is the array used to populate the dynamic table view in the DataSource class
// pass dataPoint to the next view controller which you get from segue.destinationviewController
println(dataPoint)
}
}
}