How to Get a Popup Dialog Box in Swift Playgrounds

How do I get a popup dialog box in Swift Playgrounds

Alerts need to be presented from a view controller. than means its going to show up in the simulator inside the assistant editor:

Example:

import UIKit
import PlaygroundSupport

let alert = UIAlertController(title: "My Alert", message: "This is an alert.", preferredStyle: .alert)
alert.addAction(UIAlertAction(title: NSLocalizedString("OK", comment: "Default action"), style: .default, handler: { _ in
    NSLog("The \"OK\" alert occured.")
}))
let v = UIViewController()
PlaygroundPage.current.liveView = v
v.present(alert, animated: true, completion: nil)

Swift Tutorial GuidedTour.playground does nothing when opened in XCode6

After many tries, I found out that when I download the file, it asks me if about the extension (in Chrome, sorry in French).

I always answered "Use .playground" and it resulted in an unusable file as listed by the question here. Finally I tried to use .zip extension, unarchive the file, and it works just as fine !

Hope it helps :)

How to create and get return Value from Cocoa Dialog?

You can call an NSAlert and put the NSTextField as it's accessoryView like this"

- (NSString *)input: (NSString *)prompt defaultValue: (NSString *)defaultValue {
    NSAlert *alert = [NSAlert alertWithMessageText: prompt
                                     defaultButton:@"OK"
                                   alternateButton:@"Cancel"
                                       otherButton:nil
                         informativeTextWithFormat:@""];

    NSTextField *input = [[NSTextField alloc] initWithFrame:NSMakeRect(0, 0, 200, 24)];
    [input setStringValue:defaultValue];
    [input autorelease];
    [alert setAccessoryView:input];
    NSInteger button = [alert runModal];
    if (button == NSAlertDefaultReturn) {
        [input validateEditing];
        return [input stringValue];
    } else if (button == NSAlertAlternateReturn) {
        return nil;
    } else {
        NSAssert1(NO, @"Invalid input dialog button %d", button);
        return nil;
    }
}

Popup alert user before delete TableViewCell in swift?

All you have to do is present the alert when the button is pressed and set each action.

Replace your commit editingStyle delegate method with this and replace the data variable with your data array:

func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
    if editingStyle == .delete {
        presentDeletionFailsafe(indexPath: indexPath)
    }
}

func presentDeletionFailsafe(indexPath: IndexPath) {
    let alert = UIAlertController(title: nil, message: "Are you sure you'd like to delete this cell", preferredStyle: .alert)

    // yes action
    let yesAction = UIAlertAction(title: "Yes", style: .default) { _ in
        // replace data variable with your own data array
        self.data.remove(at: indexPath.row)
        self.tableView.deleteRows(at: [indexPath], with: .fade)
    }

    alert.addAction(yesAction)

    // cancel action
    alert.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: nil))

    present(alert, animated: true, completion: nil)
}

EDIT

Example:

private let reuseId = "cellReuseId"

class SlideToDeleteViewController : UIViewController {
    lazy var tableView = createTableView()

    func createTableView() -> UITableView {
        let tableView = UITableView()
        tableView.register(UITableViewCell.self, forCellReuseIdentifier: reuseId)
        tableView.dataSource = self
        tableView.delegate = self
        return tableView
    }

    var data = ["one", "two", "three", "four"]

    override func loadView() {
        self.view = tableView
    }

    override func viewDidLoad() {
        super.viewDidLoad()
    }
}

extension SlideToDeleteViewController: UITableViewDataSource, UITableViewDelegate {

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return data.count
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: reuseId)
        cell?.textLabel?.text = data[indexPath.row]
        return cell!
    }

    func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
        return true
    }

    func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
        if editingStyle == .delete {
            presentDeletionFailsafe(indexPath: indexPath)
        }
    }

    func presentDeletionFailsafe(indexPath: IndexPath) {
        let alert = UIAlertController(title: nil, message: "Are you sure you'd like to delete this cell", preferredStyle: .alert)

        // yes action
        let yesAction = UIAlertAction(title: "Yes", style: .default) { _ in
            // put code to remove tableView cell here
            self.data.remove(at: indexPath.row)
            self.tableView.deleteRows(at: [indexPath], with: .fade)
        }

        alert.addAction(yesAction)

        // cancel action
        alert.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: nil))

        present(alert, animated: true, completion: nil)
    }
}

string urlsession response is not handled correctly

welcome to SO and Swift!

Your server is sending "EXIST", but you are checking for EXIST.

IOW, instead of string.elementsEqual("EXIST") == true, try string.elementsEqual("\"EXIST\"") == true.

But don't stop there. Simplify the expression to string == "\"EXIST\"".

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