My first question here. I'm making the jump from Delphi and Pascal to Xcode and Swift and feeling totally overwhelmed by the change.
I'm simply attempting to change the text of a label when a button is clicked. Here is my code from ViewController.swift
import Cocoa
class ViewController: NSViewController {
#IBOutlet weak var Label1: NSTextField!
#IBOutlet weak var ChangeText: NSTextField!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
#IBAction func ButtonPressed(sender: AnyObject) {
Label1.stringValue = "Hello World"
}
override var representedObject: AnyObject? {
didSet {
// Update the view, if already loaded.
}
}
When I run the application as soon as I click the button the application hangs.
I've also tried exchanging stringValue with text but NSTextField does not use this. I can't seem to make the label show up as UITextField.
What am I doing wrong?
Related
I'm trying to build a very simple app just to see how the UISlider works. I've seen several tutorials and followed them to the letter but nothing seems to work.
I keep getting this error exactly when I try to move the Slider in the simulator, after I've successfully built
This is my whole code. It's really simple but I can't understand why the Slider won't work.
import UIKit
class ViewController: UIViewController {
#IBOutlet weak var noteBottomLabel: UILabel!
#IBOutlet weak var sliderNoteBottom: UISlider!
#IBAction func changedSliderNoteBottom(sender: AnyObject) {
var noteBottomValue = Int(sliderNoteBottom.value)
noteBottomLabel.text = "\(noteBottomValue)"
}
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.
}
Can you see any problems with this? I'm probably noobing out, but I've looked everywhere and can't find an explanation
import UIKit
import CoreFoundation
class ViewController2 : UIViewController {
override func viewDidLoad() {
super.viewDidLoad();
}
#IBOutlet weak var slider: UISlider!
#IBAction func slidervaluechanged(sender: UISlider) {
print(Int(slider.value))
}
}
I have tried your code just made the print of slider.value rather than putting it on label .
But I have used Xcode 7.3 , I don't think this should be problem with Xcode .Use the sender as UISlider when making an #IBAction that looks better . Brings up the value of 0 at bottom and 1 at top.
I'm trying to learn swift code for mac OSX but there isn't much tutorials for it as ios. and i have been struggling already with closing or dismissing the view controller when i launch through a button another connected view controller
class ViewController: NSViewController {
#IBOutlet weak var username: NSTextField!
#IBOutlet weak var password: NSTextField!
#IBAction func login(sender: AnyObject) {
}
#IBAction func signUp(sender: AnyObject) {
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override var representedObject: AnyObject? {
didSet {
// Update the view, if already loaded.
}
}
}
I tried to add [self dismissModalViewControllerAnimated:YES]; to dismiss it but it doesn't work it only shows errors. if anybody could point me to somewhere i can get more information or what i'm doing wrong?
Use
dismissViewController(self)
to dismiss the presented view controller.
About dismissViewController: from the NSViewController docs:
Dismisses a presented view controller, using the same animator that presented it.
and
In OS X, this is the universal way to dismiss a view controller, no matter how it was presented.
I am trying to pass data between two viewContollers in an OS X storyboard application using Swift. When I press a button on VC1, it opens VC2, and prepareForSegue is run. However, I can't pass data back to VC1 because a. prepareForSegue isn't being run (because a window isn't being opened) and b. because even if it were, VC1 doesn't know data is being sent and I can't figure out a function (something like viewDidBecomeFocus, if such a function existed) to let it know to look. I feel like there must be a way to do this.
If you know of a way to do this in IOS but not OSX, it could still be useful.
Thanks!
Let assume that in your first ViewController you have one label and one button. When pressed, that button open popover (SecondViewController) with one textfield (and one button what says ready or close etc.), where you want take its value and assign it to your label. That is where delegates and protocols come handy.
SecondViewController:
#objc protocol TextDelegate {
func passedString(textValue: String)
}
class SecondViewController: NSViewController {
#IBOutlet weak var textField: NSTextField!
weak var delegate: TextDelegate?
override func viewDidLoad() {
super.viewDidLoad()
// Do view setup here.
}
#IBAction func closePopOver(sender: AnyObject) {
if delegate != nil {
delegate!.passedString(textField.stringValue)
}
self.dismissViewController(self)
}
}
This is ViewController:
#IBOutlet weak var myLabel: NSTextField!
override func prepareForSegue(segue: NSStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "mySegue" {
let vc = segue.destinationController as! SecondViewController
vc.delegate = self
}
}
func passedString(textValue: String) {
myLabel.stringValue = textValue
}
Im simply trying to make it so when I click on a UIButton (for which it currently shows the image of a shell), the image changes into something else (in this case, a coin).
This is what i tried so far and have not had any success. I cant find anything to do this for Swift.Thanks.
import UIKit
class ViewController: UIViewController {
#IBOutlet weak var lblOutput: UILabel!
#IBOutlet weak var lblWin: UILabel!
#IBOutlet weak var lblLost: UILabel!
#IBOutlet weak var lblWinsAmt: UILabel!
#IBOutlet weak var lblLossesAmt: UILabel!
let coin = UIImage(named: "penny_head") as UIImage;
override func viewDidLoad() {
super.viewDidLoad()
//imgShell1.hidden = true //doesnt work
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func btnStart(sender: UIButton) {
}
#IBAction func btnShell1(sender: UIButton) {
sender.setImage(coin,forState: UIControlState.Highlighted);
}
The way you're setting up the control is incorrect. Assuming you have a button property named btnShell (and it's the button you want to setup) change your viewDidLoad() method to:
override func viewDidLoad()
{
super.viewDidLoad()
btnShell.setImage(imgShell1, forState:.Normal);
btnShell.setImage(coin, forState:.Highlighted);
}
And then remove the setImage(_:forState:) call from the action method:
#IBAction func btnShell1(sender: UIButton) {
sender.setImage(coin,forState: UIControlState.Highlighted);
}
To permanently change the button image on tap, you have to use the .Normal enum case and not .Highlighted for the control state:
sender.setImage(coin,forState: UIControlState.Normal)
Setting the image for the .Highlighted state makes the new image appear only when the button is in that state, i.e. when it is tapped.
If you are looking to change the UIButton's background image permanently you have to use Antonio's method:
sender.setImage(coin,forState: UIControlState.Normal)
This won't change the UIKit's default highlighting when you tap the button. When you don't want the button to be highlighted when you touch it or have different appearances for different states, then you might be better off using an UIImageView.
In viewDidLoad():
imgView?.image = imgOne
imgView?.userInteractionEnabled = true
imgView?.addGestureRecognizer(UITapGestureRecognizer(target: self, action: "changeImage:"))
The function that changes the image:
func changeImage(recognizer: UITapGestureRecognizer){
self.imgView?.image = imgTwo
}
You can also use isSelected.
button.setImage(image2, for: .normal)
button.setImage(image1, for: .selected)
I am a relatively new developer working with swift in Xcode 6.1 beta. I am trying to make a simple application that has 2 text fields: 1 for first name, 1 for last name. When the submit button is pressed, a new window opens and displays the full name.
I have successfully gotten the application to work on a single window, with the result appearing in a third non-editable text field.
However, when I add the second view controller to the storyboard for the new window, make it launch when the button is pushed, and drag the result field into it, the application does not work.
I tried re-linking the field to my ViewController.swift (where all my code is), but it does not show up on automatic. When I open it via manual, I cannot link to the file.
original window:
http://i.stack.imgur.com/C0xui.png
new window:
http://i.stack.imgur.com/XdZ2l.png
Viewcontroller.swift:
import Cocoa
class ViewController: NSViewController {
#IBOutlet var window: NSView!
#IBOutlet weak var first: NSTextField!
#IBOutlet weak var last: NSTextField!
#IBOutlet weak var output: NSTextField!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
#IBAction func btn(sender: AnyObject) {
var first = self.first.stringValue
var last = self.last.stringValue
if first.isEmpty {
self.output.stringValue = ""
}
else {
self.output.stringValue = "Hello, \(self.first.stringValue) \(self.last.stringValue)!"
}
}
override var representedObject: AnyObject? {
didSet {
}
}
}
You have to show assistant window in the menu
View > Assistant Editor > Show Assistant Editor