I have a label in my app that the user should be able to tap on with VoiceOver enabled to have it speak the text of that label. However, I want it to always say something before it reads the label's text. I tried to set the accessibilityLabel via self.displayLabel.accessibilityLabel = "my text here" + self.displayLabel.text! but this results in it always being set to the label's original text value which is always changing in this app.
How can I add text to announce just before the label's content, ensuring it will always speak the label's current text contents?
Override the accessibilityLabel property in the UILabel subclass to return whatever you'd like.
override var accessibilityLabel: String! {
get {
return "my text here" + "," + self.text!
}
set { }
}
You may want to post an announcement each time the text changes to inform VO users the value has changed.
Related
I have a UITextField and UILabel sitting together in a UIView as so:
and here it is in Xcode:
The label is hidden until the user enters some text into the text field, so it serves to provide a persistent "suffix" to the numeric entry. The problem is that when the user types a number into the text field, it doesn't shrink down to the size of the text, it remains at the size of the original placeholder, even though it isn't visible, as so:
Is there any way I can constrain the text field's width to be the minimum size to accommodate the user's text, and not pay attention to the invisible placeholder text's width?
Thank you
I managed to solve it myself:
Whenever the text is edited, the text field is checked to see if there is any text inside. If there is no text, the 'mg' suffix is hidden, and the placeholder is added. If there is text, the 'mg' suffix is shown and the placeholder is removed. Like so: (Swift)
func textFieldTextChanged(_ textField: UITextField) {
milligramTextField.invalidateIntrinsicContentSize()
view.layoutIfNeeded()
if textField.text == "" {
milligramSuffixLabel.text = ""
milligramTextField.placeholder = "0 mg"
} else {
milligramSuffixLabel.text = " mg"
milligramTextField.placeholder = ""
}
}
This answer was of great help.
I would like to add (some predefined) text at the current cursor position in a UITextView using Swift. So if I have a UITextField named txtField that has some text in it already such as "this is a beautiful valley" and I tap in the area between "a" and "beautiful" so that the cursor is now in the space between "a" and "beautiful" and then click a Button on my user interface a string of text such as "very" will get typed at the cursor position, so that the text in the UITextView will now become "this is a very beautiful valley". At the end of this operation (after button click event) I would the cursor to be just after the word "very". Many thanks for your help. I can see some question on the forum with similar themes, but the answers are in Objective C. I suicidal like help using Swift.
Try this... Inside your button's IBAction use this (please do not use forced optional unwrapping) or else if the textView has no selection or cursor, the app might crash:
let txt = "whatever you want"
if let range = handleToYourTextView.selectedTextRange {
// From your question I assume that you do not want to replace a selection, only insert some text where the cursor is.
if range.start == range.end {
handleToYourTextView.replaceRange(range, withText: txt)
}
}
try this
textView.replaceRange(textView.selectedTextRange!, withText: "your text")
update:
Swift 5.2
let txt = "whatever you want"
if let range = myTextView.selectedTextRange {
if range.start == range.end {
myTextView.replace(range, withText: txt)
}
I am going through the Stanford Winter 2015 Swift/iOS course and while doing the assignments I run into a behavior I'd like to change.
I use Autolayout as described in the videos (making the display pin to leading and trailing view edges) and the Calculator app "Display" UILabel is fine with an initial value of 0 and whenever the value used to set it (a String) is non-nil and non "".
If it is either nil or "", the entire UILabel disappears. What I am trying to do is to "clear" the display whenever there is no value to display or an incorrect calculation resulted in nil.
Any tips on who to deal with this in general? "Clearing" a UILabel without changing it's on-screen dimensions?
Edit (thanks Rob)
The UILabel has the following constraints
1. Option-click drag-left to containing UIView, selected "leading" something (on commute to work can't check yet for exact wording.
2. Same method as (1) except that the drag is to the right edge and selecting "trailing"
3. Option click-drag up to top of view, select "vertical" menu option.
4. Same as (3) except that drag is to a UIButton underneath the UILabel on the GUI.
With those settings, the label when it contains a number is always visible and (if understand, will color it to verify) stretches across the screen even if the text doesn't.
The layout looks correct in profile and landscape as long as content of UILabel is not empty. If empty, it seems to "shrink to fit" so much that the buttons below get moved up towards the top.
I'm a C++ dev since mid 90s but I have little UI experience and no more than a couple weeks experience in iOS/Swift development.
Thanks!
You can always give the UILabel a min width and min height or constraints that holds the left and right side of the label. That should keep the label from changing it's dimensions to zero.
Use a custom UILabel class assigned in Interface Builder >> Identity inspector >> Custom Class >> Class to override UILabel intrinsic content size.
No need to create any superfluous auto-layout constraints.
Swift:
class UILabelNonCompressible: UILabel
{
private static let NonCompressibleInvisibleContent = " "
override var intrinsicContentSize: CGSize
{
if /* zero-width */ text == nil ? true : text!.isEmpty
{
// prefer mirror-and-calculate over modify-calculate-restore due to KVO
let doppelganger = createCopy()
// calculate for any non-zero -height content
doppelganger.text = UILabelNonCompressible.NonCompressibleInvisibleContent
// override
return doppelganger.intrinsicContentSize
}
else
{
return super.intrinsicContentSize
}
}
}
You will also need "How do copy for UILabel?":
extension UILabel
{
func createCopy() -> UILabel
{
let archivedData = NSKeyedArchiver.archivedData(withRootObject: self)
return NSKeyedUnarchiver.unarchiveObject(with: archivedData) as! UILabel
}
}
I have a UITextField that shrinks and expands when user input text. If the textfield's width reach the screen width, I want it to be right-aligned so user can see the last input characters. In other circumstance, I want it to be left-aligned.
Because the textfield's maximum width is not exactly the same with screen, I need to find a way to check if it has characters out of visible area.
Is there anyway to achieve this?
You could try checking the width of the string that is in the field and comparing it to the width of the field itself. It would look something like this -
CGSize textSize = [self.field.text sizeWithAttributes:#{NSFontAttributeName:self.field.font}];
// If the text is larger than the field
if (textSize.width > self.field.bounds.size.width) {
// There is text that is not visible in the field.
}
This is fairly rough, but should get you close.
I am new to BB application. I want customized the size for the button text and label text.
I am using this code
try {
FontFamily alphaSansFamily = FontFamily.forName("BBAlpha Serif");
Font appFont = alphaSansFamily.getFont(Font.PLAIN, 9, Ui.UNITS_pt);
setFont(appFont);
} catch (ClassNotFoundException e) {
}
but using this it will change size for what all the field we are using within the constructor.But I need different size for different field .Like Title will be big size and other label text button text will be small size.
I am guessing that you are calling that when you are creating the screen so the setFont() changes the font for the full screen.
You can call set font on the required button or label and it will change the font only for that field
e.g button.setFont(yourFont)
Are you calling setFont() explicitly on the Field you wish to change?
just in the above try block donot declere the statement setFont(appFont), this sets the font of the whole screen.
Insead set the font by specifying which label or button you want to set the font like
LabelField lf1 = new LabelField("Testing");
lf1.setFont(appFont);
Again
ObjectChoiceField ocf1 = new ObjectChoiceField("","","");
ocf1.setFont(appFont);