I have a UIViewController with 3 UITextFields. Every time either of the fields gets focus, I want to set a new text value for a tip label above. What is the best way to achieve this with RxSwift?
This does what you're looking for. Any time a UITextField would send a textFieldDidBeginEditing: delegate message, you instead get an Observable for that. Then you map that Observable into the correct string for that text field. Then combine all 3 of those Observables into just one, where the latest event is from the text field that most recently called that delegate message. Then you bind that value to the tooltip's text.
import UIKit
import RxSwift
import RxCocoa
class ViewController: UIViewController {
let disposeBag = DisposeBag()
#IBOutlet weak var tooltip: UILabel!
#IBOutlet weak var textField1: UITextField!
#IBOutlet weak var textField2: UITextField!
#IBOutlet weak var textField3: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
let textField1Text = textField1.rx_controlEvent(.EditingDidBegin)
.map { "text field 1 message" }
let textField2Text = textField2.rx_controlEvent(.EditingDidBegin)
.map { "text field 2 message" }
let textField3Text = textField3.rx_controlEvent(.EditingDidBegin)
.map { "text field 3 message" }
Observable.of(textField1Text, textField2Text, textField3Text).merge()
.bindTo(tooltip.rx_text)
.addDisposableTo(disposeBag)
}
}
Related
I apologize if this has been asked before but I couldn't find what I was looking for online over the last few hours. I'm still functional a noob with swift.
I am trying to store the stringValue of a TextField when I click a NSButton. If I click anywhere and then click on the NSButton the code works perfect but if I don't click the stringValue is still reporting the previous value.
#IBOutlet weak var NameText: NSTextField!
#IBOutlet weak var SaveChangesAccountButton: NSButton!
var selectedAccountItemNumber = NSInteger()
#IBAction func SaveAccountChanges(_ sender: Any)
{
let AccountName = NameText.stringValue
AccountingData.instance.book.account[selectedAccountItemNumber].name = AccountName
}
You have to call validateEditing() on the text field.
And please conform to the naming convention that variable and function names start with a lowercase letter and don't use NSInteger in Swift.
#IBOutlet weak var nameText: NSTextField!
#IBOutlet weak var saveChangesAccountButton: NSButton!
var selectedAccountItemNumber = 0
#IBAction func saveAccountChanges(_ sender: Any)
{
nameText.validateEditing()
let accountName = nameText.stringValue
AccountingData.instance.book.account[selectedAccountItemNumber].name = accountName
}
Here's what I've got:
#IBOutlet weak var password: NSSecureTextField!
#IBOutlet weak var shwpswd: NSButton! //Checkbox
#IBOutlet weak var pswdcell: NSSecureTextFieldCell! //Cell
#IBAction func shwpswd(_ sender: Any) {
if(shwpswd.state == 1) {
pswdcell.echosBullets = false // Turn the Secure text into regular text
}
else if(shwpswd.state == 0) {
pswdcell.echosBullets = true // Secure text
}
}
Everything seems to run fine, except the text in the password field doesn't change states between echoing bullets and echoing the real text. Everything is linked together properly too - Cell is within the text field, password button is in the view and the outlet works. I'm wondering if this is another one of the "Swift on mac < Swift on iOS cases".
EDIT: Here is the final solution, should anyone care to see it:
#IBOutlet weak var shwpswd: NSButton! //Checkbox
#IBOutlet weak var visPswd: NSTextfield! //hidden regular box to show chars
#IBOutlet weak var password: NSSecureTextField! //visible initial secure box
#IBAction func shwpswd(_ sender: Any) {
if(shwpswd.state == 1) {
self.visPswd.stringValue = self.password.stringValue //Sync both the text fields
self.password.isHidden = true //hide the secure field
self.visPswd.isHidden = false //show the real character echo field
}
else if(shwpswd.state == 0) {
self.password.stringValue = self.visPswd.stringValue //Sync the two
self.password.isHidden = false // Inverse of above
self.visPswd.isHidden = true
}
}
Note the text fields password and visPswd are the same size and position in the view - one remains hidden at all times to avoid overlapping. When the user enters values in either the password or visPswd field, it syncs with the other field when the checkbox state is changed.
You can accomplish what you want adding a second text field in top of your secure field. Add an IBAction to your check box to switch your fields isHidden property and copy the other textField stringValue and make it the first responder. Your implementation should look like something like this:
import Cocoa
class ViewController: NSViewController {
#IBOutlet weak var password: NSSecureTextField!
#IBOutlet weak var showPassword: NSTextField!
#IBOutlet weak var shwpswd: NSButton!
override func viewDidLoad() {
super.viewDidLoad()
shwpswd.state = .off
showPassword.isHidden = true
}
override func viewDidAppear() {
super.viewDidAppear()
password.window?.makeFirstResponder(password)
}
#IBAction func showHidePassword(_ sender: NSButton) {
showPassword.isHidden.toggle()
password.isHidden.toggle()
if !showPassword.isHidden {
showPassword.stringValue = password.stringValue
showPassword.becomeFirstResponder()
} else {
password.stringValue = showPassword.stringValue
password.becomeFirstResponder()
}
}
}
show/hide password sample
Is it possible to use a variable in a label name.
For example, my label is called button1text and I have a variable var x = 1.
Is there a way to do thisbutton(x)text?
No. You can not have variable name in identifier.
Variable names are evaluated at compile time, so no, it's not possible (at runtime).
Alternatively use an array or assign tags to the labels and get the label with viewWithTag
You can use reflection with Mirror. The capabilities are very limited in the context you want but you can try something like:
import UIKit
class ViewController: UIViewController {
#IBOutlet weak var button1: UIButton!
#IBOutlet weak var button2: UIButton!
#IBOutlet weak var button3: UIButton!
#IBAction func didTapGoButton(_ sender: Any) {
let mirror = Mirror(reflecting: self)
for child in mirror.children {
if let v = child.label, v == "button2" {
(child.value as! UIButton).titleLabel?.text = "changed"
}
}
}
}
I am having an issue where my NSTextField IBOutlets are showing up as nil, even though they are connected to the storyboard. In the simplified example below, I have a button that, when pressed, should list the string value of the 3 text labels.
Here is the code for the button:
import Foundation
import Cocoa
class ViewController: NSObject{
#IBAction func pushButton(sender: AnyObject) {
let oneText = Texts()
oneText.listTextFields()
}
}
Here is the code for the NSTextField list:
import Foundation
import Cocoa
class Texts: NSObject{
#IBOutlet weak var l1: NSTextField!
#IBOutlet weak var l2: NSTextField!
#IBOutlet weak var l3: NSTextField!
var textArray = [NSTextField]()
func listTextFields (){
self.textArray = [self.l1,self.l2,self.l3]
for var i = 0; i < textArray.count; i++ {
let text = textArray[i]
print(text.stringValue)
}
}
}
I have verified that the IBOutlets are all connected, but I get a "fatal error: unexpectedly found nil while unwrapping an Optional value" message when I run the program and press the button. Looking at the debugger, it appears that the tree NSTextfields are "nil."
What am I doing wrong?
You're not loading Texts from your storyboard, so it knows nothing about your outlets. Texts() creates a new instance of the object, which you then call the method on.
You presumably have an existing Texts object somewhere in interface builder, ViewController should have an outlet to that.
I have 2 textfields. If they both has a float value bigger than 100, when you click on my button it should allow you to go to another page.
So far so good, however in my code the text field can't have either int or float or doubles...
What can I do?
As Lukas says you need to convert it to a string. If you are capturing the value in the textfield on button click, you need to convert it, like so:
if let doubleValue = Double(textField.text!) {
}
I think based on what you have said, you need to do something like this:
class ViewController: UIViewController {
#IBOutlet weak var box1: UITextField!
#IBOutlet weak var box2: UITextField!
#IBOutlet weak var Check: UIButton!
#IBOutlet weak var Page1: UILabel!
#IBAction func didPressCheckButton(sender: UIButton) {
if let stringValue = box1.text {
if let doubleValue = Double(stringValue) {
if doubleValue > 100 {
print("Navigate to next page")
}
}
}
}
}
You will need to modify the check so that you check if both text boxes have values over 100, but this is a starting point.