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Strange behaviour observed on UITextField text disappears,
Steps:
Type text in UITextField and click home button.
Open another application (App) and click home button.
Then Open First App the UITextField in text is disappears.
Issue observed in IPhone 6s version 9.2.1. but perfectly working in simulator.
You can override this method in your custom responders to update your object's state or perform some action such as highlighting the selection. If you override this method, you must call super at some point in your implementation.
The custom Class should be similar to:
class CustomSecureTextField: UITextField {
override func becomeFirstResponder() -> Bool {
super.becomeFirstResponder()
//if !isSecureTextEntry {
// return true
//}
if let currentText = text {
insertText(currentText)
}
return true
}
}
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I want to implement a button that inverts the background color of the app when the user presses it. I tried assigning dark and light to the overrideUserInterfaceStyle property, but it only changes the color of the navigation bar. The only answers I've found so far are to create an ancestor controller of the full controller and manage the colors globally there. Can you tell me if there is a property or method that can access the full colors of the app? Or is there another good way...
here's my code I tried but only get feature toggles color of navigation bar dark/light...
#objc func onClickSwitch(_ sender : UISwitch) {
if #available(iOS 13.0, *) {
let windowScene = UIApplication.shared.connectedScenes.first as! UIWindowScene
if sender.isOn {
print("dark mode")
windowScene.keyWindow?.overrideUserInterfaceStyle = .dark
} else {
print("white mode")
windowScene.keyWindow?.overrideUserInterfaceStyle = .light
}
}
}
This question already has an answer here:
Key up and key down enabled on ios UIKeyboard [closed]
(1 answer)
Closed 5 months ago.
I am developing a library, which will be used in an app,
where I need to know the timestamp of key pressed (key down and key up moments), in the iOS(iPhone) virtual keyboard.
I was trying to do it by inheritance from UIViewController and override pressesBegan and pressesEnded functions like here, but it turns out its only working for external physical keyboards (so like >1% users of iPhones?)
I was trying to do this by getting all the textFields:
func getAllTextFields(fromView view: UIView)-> [UITextField] {
return view.subviews.flatMap { (view) -> [UITextField] in
if view is UITextField {
return [(view as! UITextField)]
} else {
return getAllTextFields(fromView: view)
}
}.flatMap({$0})
}
and use of .addTarget method but there's no function which provide information about "key down" moment:
textFields.forEach{($0.addTarget(self, action: #selector(textFieldEditingBegin),
for: .editingDidBegin))}
textFields.forEach{($0.addTarget(self, action: #selector(textFieldDidChange),
for: .editingChanged))}
textFields.forEach{($0.addTarget(self, action: #selector(textFieldDidEnd),
for: .editingDidEnd))}
The .editingChanged method can only be translated to "key up".
The other ones, tells us about whole textField, so the moment when user "tap" on it and not the moment when he "tap" the letter in the virtual keyboard.
I have not found anything useful for me in the NotificationCenter, UIResponder or UITextFieldDelegate.
So im asking if anyone knows how can I retrieve such information from a iOS keyboard,
im not very familiar with Extension mechanism and maybe there is some other stuff im able to do in my scenario.
Thanks.
You can detect user's tap using UITextFieldDelegate
func textFieldDidBeginEditing(_ textField: UITextField) // became first responder
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I am trying simple logic, I have only one textfield. into this textfield if user entered 1 to 9 I need to show alert using if.
if emailTextField.text < 0 {
print("100%")
}
UITextField's text is always a String. So if you need to check if it is a particular number, you need to cast the String value to an Int.
if let number = Int(emailTextField.text!), (0...9).contains(number) {
print("100%)
}
Note: You might want to check out the UITextFieldDelegate methods if your logic revolves around text field editing events.
yourTextField.addTarget(self, action: #selector(valueChanged(_:)), for: .valueChanged)
.
.
.
#objc func valueChanged(_ textField: UITextField) {
if let number = Int(emailTextField.text!), (0...9).contains(number) {
print("100%)
}
}
Sidenote: I have no idea what your use case is for this.
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I am trying to handle the pressing of the back button on a UI Navigation bar. I have an extension in objective C (https://github.com/onegray/UIViewController-BackButtonHandler) and i have bridged it to my project in Swift using the header, now I do not quite know how to implement the code in Swift. This is the implementation in C:
-(BOOL) navigationShouldPopOnBackButton {
if(needsShowConfirmation) {
// Show confirmation alert
// ...
return NO; // Ignore 'Back' button this time
}
return YES; // Process 'Back' button click and Pop view controler
}
func navigationShouldPopOnBackButton() -> Bool {
if(needsShowConfirmation) {
// Show confirmation alert
// ...
return false // Ignore 'Back' button this time
}
return true // Process 'Back' button click and Pop view controller
}
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Is there an option to observe and get the information about appearing and disappearing?
I want to grayscale my elements like apple ui-elements by appearing of UIAlertController!
Since now i found out that the "_UIBackdropViewComputeAndApplySettingsNotification" was called and contains userInfo about the appearing view.
You are going to make the UIAlertController's view appear, so how can you not know? You don't need to observe it; you're doing it (by calling presentViewController...).
That takes of what happens when the alert appears. What about when it disappears? Well, it disappears because the user tapped a button. You get to write the handler for every button in the alert. So again, you know when the alert is disappearing, because your handler is running.
The solution is, everything works automatically. You just have to implement..
override func tintColorDidChange() {
self.setNeedsDisplay()
}
..and of course working with the tintColor
Thanks matt for quick answer!
To expand on the other answers: each of your UIView subclasses should implement tintColorDidChange to be notified of the change.
Here's a sample implementation:
class someLabel : UILabel {
override func tintColorDidChange() {
let isInactive = self.tintAdjustmentMode == UIViewTintAdjustmentMode.Dimmed
if (isInactive) {
// modify subviews to look disabled
self.textColor = UIColor.grayColor()
} else {
// modify subviews to look enabled
self.textColor = self.tintColor
}
}
}
A few other good code samples (albeit in Objective-C) can be found in this SO question.