So I have been messing around with saving and calling from NSUserDefaults and I have made progress but I keep on getting this error.
"Expression resolves to an unused function"
The program is supposed to save a string from a textfield so that if you close the program and open it the string will still be their. Unless, you press save again and then the string (Label) will change.
The problem prevents me from running the program so I have not been able to test the new code that I wrote.
Here is the source code feel free to try it. All of this is written in swift.
//
// ViewController.swift
// Help
//
// Created by Lucas on 9/30/15.
// Copyright (c) 2015 Lucas. All rights reserved.
//
import UIKit
class ViewController: UIViewController {
#IBOutlet var Savedlbl: UILabel!
#IBOutlet var Textfield: UITextField!
#IBOutlet var Label: UILabel!
var current = ""
var Saved = ""
override func viewDidLoad() {
super.viewDidLoad()
let currentDefault = NSUserDefaults.standardUserDefaults()
Savedlbl.text = currentDefault.valueForKey("saved") as? String
// Do any additional setup after loading the view, typically from a nib.
}
#IBAction func Set(sender: AnyObject) {
setall()
}
func setall()
{
current = Textfield.text!
Label.text = Textfield.text!
Savedlbl.text = Textfield.text!
let currentDefault = NSUserDefaults.standardUserDefaults()
Savedlbl.text = currentDefault.valueForKey("saved") as? String
currentDefault.setValue(Saved, forKey: "saved")
currentDefault.synchronize
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
The line:
currentDefault.synchronize
should be:
currentDefault.synchronize()
Related
I'm trying to go next screen after the save button is pushed, i tried to write code perform segue and i get buch of errors. Below is my code currently, i didn't finish the save part. I wanted to go back to that later time.
I'm new to coding in xcode, so any advice on where to put this code would be nice.
import UIKit
import CoreData
class SignupVC: UIViewController {
#IBOutlet var txtfirstname: UITextField!
#IBOutlet var txtlastname: UITextField!
#IBOutlet var txtUsername: UITextField!
#IBOutlet var txtPassword: UITextField!
#IBOutlet var txtConfirmpassword: UITextField!
#IBOutlet var txtEmail: UITextField!
var context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func signupTapped(_ sender: Any) {
_ = txtUsername.text;
_ = txtPassword.text;
_ = txtConfirmpassword.text;
_ = txtEmail.text;
//check empty fields
if((txtPassword.text?.isEmpty)! || (txtConfirmpassword.text?.isEmpty)! || (txtEmail.text?.isEmpty)!)
{
//Display alert
displayMyAlertMessage(userMessage: "All fields are required")
return;
}
//check if passwords match
if (txtPassword.text != txtConfirmpassword.text)
{
//Display in alert message
displayMyAlertMessage(userMessage: "Passwords don't match");
return;
}
//store Data
// Display alert message with Confirmation
}
func displayMyAlertMessage(userMessage:String)
{
let myAlert = UIAlertController(title:"Alert", message: userMessage, preferredStyle: UIAlertControllerStyle.alert);
let okAction = UIAlertAction(title:"ok", style: UIAlertActionStyle.default, handler:nil);
myAlert.addAction(okAction);
self.present(myAlert, animated:true, completion:nil);
}
/*
just go into storyboard and hold control key on the button and let it go on the ViewController you want to go to. Then select the kind. For Example "Show"
then it should work. If you have questions ask.
I am working on a Mac OS X application with Swift.
This is my first time and I thought it would be the same as it is on iOS.
So I got this error (in the title) on this code:
import Cocoa
import AppKit
class LoginViewController: NSViewController {
#IBOutlet weak var emailTextField: NSTextField!
#IBOutlet weak var passwordTextField: NSSecureTextField!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override func viewDidAppear() {
}
super.viewDidAppear()
if NSUserDefaults.standardUserDefaults().valueForKey("uid") != nil && CURRENT_USER!.authData != nil
{
self.logoutButton.hidden = false
}
}
func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
func loginAction(sender: AnyObject)
{
let email = self.emailTextField.text
let password = self.passwordTextField.text
...
}
}
What do I have to write instead of self?
Using self is correct. Try using the property stringValue instead of text.
Here is the code that worked for me:
#IBOutlet weak var emailTextField: NSTextField!
#IBAction func sendTapped(sender: AnyObject) {
let email = self.emailTextField.stringValue
print(email)
}
For one of my static labels on my main story board, it prints out "Optional("United States"). However, I would like it to print out "United States". So my question is, how do I get rid of the "Optional" part? I've already tried doing:
if let p = placemarks!.first{
self.addressLabel.text = "\(p.country)"
}
I think the exclamation mark is supposed to "unwrap" some value right? However, even if I do p = placemarks!.first, it prints out "Optional("United States").
Below is the rest of my code just in case you would like some context:
//
// ViewController.swift
// Map Demo Rob 2
//
// Created by Jae Hyun Kim on 8/17/15.
// Copyright © 2015 Jae Hyun Kim. All rights reserved.
//
import UIKit
import CoreLocation
class ViewController: UIViewController, CLLocationManagerDelegate {
#IBOutlet weak var latitudeLabel: UILabel!
#IBOutlet weak var longitudeLabel: UILabel!
#IBOutlet weak var courseLabel: UILabel!
#IBOutlet weak var speedLabel: UILabel!
#IBOutlet weak var altitudeLabel: UILabel!
#IBOutlet weak var addressLabel: UILabel!
var manager: CLLocationManager!
override func viewDidLoad() {
super.viewDidLoad()
manager = CLLocationManager()
manager.delegate = self
manager.desiredAccuracy = kCLLocationAccuracyBest
manager.requestWhenInUseAuthorization()
manager.startUpdatingLocation()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
print(locations)
let userLocation: CLLocation = locations[0]
self.latitudeLabel.text = "\(userLocation.coordinate.latitude)"
self.longitudeLabel.text = "\(userLocation.coordinate.longitude)"
self.courseLabel.text = "\(userLocation.course)"
self.speedLabel.text = "\(userLocation.speed)"
self.altitudeLabel.text = "\(userLocation.altitude)"
CLGeocoder().reverseGeocodeLocation(userLocation, completionHandler: {(placemarks, error) -> Void in
print(userLocation)
if error != nil {
print(error)
return
}
else {
if let p = placemarks?.first{
self.addressLabel.text = "\(p.country)"
}
}
})
}
}
In
if let p = placemarks!.first{
self.addressLabel.text = "\(p.country)"
}
p.country is an Optional<String>. You need to unwrap that aswell in order to output only it's content (if it exists).
if let country = placemarks?.first?.country {
self.addressLabel.text = country
}
I am only coding in two features. MailComposer and WebView. But when I run my app and go to the email interface tab it crashes "fatal error: unexpectedly found nil while unwrapping an Optional value (lldb)". When I go to the tab that displays the webview, it works fine. The Webview.loadRequest(request) is messing something up with the mail coding. But I don't know where I can put it to make both features work.
If anyone has any clue how to fix this, please let me know. Thanks.
Here is the coding for the View.Controller.Swift file...
import UIKit
import MessageUI
class ViewController: UIViewController, MFMailComposeViewControllerDelegate {
#IBOutlet weak var Webview: UIWebView!
#IBOutlet weak var Subject: UITextField!
#IBOutlet weak var Body: UITextView!
var URLPath = "http://google.com"
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
loadAddressURL()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func SendEmail(sender: AnyObject) {
var SubjectText = "Inquiry:"
SubjectText += Subject.text
var MessageBody = Body
var toRecipients = ["phillip.lebsack1#gmail.com"]
var mc: MFMailComposeViewController = MFMailComposeViewController()
mc.mailComposeDelegate = self
mc.setSubject(SubjectText)
mc.setMessageBody(MessageBody.text, isHTML: false)
mc.setToRecipients(toRecipients)
self.presentViewController(mc, animated: true, completion: nil)
}
func mailComposeController(controller: MFMailComposeViewController!, didFinishWithResult result: MFMailComposeResult, error: NSError!) {
switch result.value{
case MFMailComposeResultCancelled.value:
NSLog("Mail Cancelled")
case MFMailComposeResultSaved.value:
NSLog("Mail Saved")
case MFMailComposeResultSent.value:
NSLog("Mail Sent")
case MFMailComposeResultFailed.value:
NSLog("Mail Sent Failure: %#",[error.localizedDescription])
default:
break
}
self.dismissViewControllerAnimated(true, completion: nil)
}
func loadAddressURL(){
let requestURL = NSURL(string:URLPath)
let request = NSURLRequest(URL: requestURL!)
Webview.loadRequest(request)
}
}
Make sure no warning message and bind all #IBOutlet in your ViewController.
I'm brand new at Swift. So I did this tutorial to make a tip calculator and it worked fine. I started a new project to see if I could recreate it, keeping the original code as reference along the way. I created my app exactly the same way, but using different variable names.
I'm getting this error at the lblABVCalculated.text line:
Thread 1: EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0)
Any ideas why the following code wouldn't work?
Heading
import UIKit
class FirstViewController: UIViewController {
#IBOutlet weak var txtOG: UITextField!
#IBOutlet weak var txtFG: UITextField!
#IBOutlet weak var lblABVCalculated: UILabel!
var OG = ""
var FG = ""
var answer : Float = 0
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func btnCalculate(sender: UIButton) {
calculateABV()
}
#IBAction func btnClear(sender: UIButton) {
txtOG.text = ""
txtFG.text = ""
lblABVCalculated.text = "ABV"
}
func calculateABV() -> Bool {
OG = txtOG.text
FG = txtFG.text
var fOG = (OG as NSString).floatValue
var fFG = (FG as NSString).floatValue
answer = fOG * (fFG * 0.01)
var answerFormat : NSString = NSString(format: "%0.2f", answer)
lblABVCalculated.text = "ABV: \(answerFormat)"
// Thread 1: EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0)
return true
}
}