So, I'm making an app that after having the user select their level of education from a picker view and if they select college education a number of buttons are supposed to appear saying 'associates degree' 'bachelor's degree' and 'master's degree'. I know I need to make an if statement like this:
func pickerView(pickerView: UIPickerView, row: Int, forComponent component: Int) -> String! {
if educationLabel.text == educationLevel {
return education[row]
If row = "College Graduate"
//Hidden buttons code
Else
//Hidden buttons
}
but I'm unsure of how to write the code that keeps all three buttons hidden as every example I've come across only had one button. I'm assuming it would be similar to what is suggested here: how to hide/show a button in swift with buttons two and three added on but I am using Swift 4 and am unsure how much of the answer I can use since it uses Swift 3. Can someone please help me out?
To hide or show buttons, you use isHidden property. To hide buttons:
button1.isHidden = true
button2.isHidden = true
To show buttons
button1.isHidden = false
button2.isHidden = false
Also the code after return doesn't get executed, you know that right?
Related
I have been spending too much time on this. I would greatly appreciate your help.
I have a picker view in my iOS app page and I have the following code to change the color of the text of the selected row. However, for some reasons, the row #1 reacts very strangely. I have added a button to the accessory view of the text field that brings up the picker view. When I tap the button, the input view switches to number pad. And if I tap the button again, it would switch back to the picker view. Here is the issue. If I select row #1 of my picker view, the color of the row #1 text changes to blue (as I intended it to be). However, if I tap the button to switch to the number pad mode, and then tap the button to switch back to the picker view, the color of the selected text in row #1 changes back to black.
Please shed some light on me. Thanks.
func pickerView(_ pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusing view: UIView?) -> UIView {
var title = UILabel()
if let view = view {
title = view as! UILabel
}
title.font = UIFont.systemFont(ofSize: 20, weight: UIFont.Weight.medium)
title.textColor = row == pickerView.selectedRow(inComponent: component) ? .systemBlue : .black
title.text = pickerViewData[row]
title.textAlignment = .center
return title
}
and the switch button function is below... only the row #1 is not working as expected... it's really strange... all the other rows change color exactly as intended... even if I use titleForRow along with attributedTitleForRow, I get the same result. Is this a Swift bug..? I tried to search for "picker view row #1 issue", but there doesn't seem to be many questions.
func switchInputView() {
pickerViewStatus = !pickerViewStatus
resetInputView()
pickerView.reloadAllComponents()
}
func resetInputView() {
switch pickerViewStatus {
case true:
activeTextField.inputView = pickerView
case false:
activeTextField.inputView = nil
activeTextField.keyboardType = .numberPad
activeTextField.becomeFirstResponder()
}
addToolbarForPickerView()
activeTextField.reloadInputViews()
}
I am a beginner learning Swift and trying to build a search page with Swift. In my search page of the app, I have added two Views in my storyboard with one View above the other.
The upper View contains a Collection View where I have two prototypes of collection view cells. The first type of the cells has Label. The second type of the cells has TextField.
The other View on the bottom half of the screen contains a dynamic Table View where I have a list of items that can be selected. Each row of the table view cells has a selection item.
So, when I tap on a table view cell, the selection item will appear in the collection view. If I type a keyword in the TextField in the collection view, table view reloads and shows all the selection items that has the keyword, so I can tap and add an item to the collection view.
I would like to keep adding by typing a keyword after I tap on a searched item in the table view. So, I made the first cell showing selected items with labels and the second cell that has the TextField separated into two sections of the collection view. So, I only reload the first section (without TextField) for each selection. But somehow the keyboard automatically resign whenever I tap on the table view cell to add an item to the collection view.
Is there any way I can keep the keyboard up even when I tap on the tableview cells?
The keyboard also resigns when I tap the collection view cells.
I would appreciate your advice. Thanks.
I hope you are having a good day.
You can try calling this method on the UITextField you would like to show the keyboard for (maybe call it after the user taps on the UITableViewCell):
textField.becomeFirstResponder()
where "textField" is the variable name of your UITextField.
Please let me know if this fixed your issue.
Edit #1
Hello! Since my previous solution did not achieve your intended behavior. There is another solution in my mind, however I have not tried it before.
As an introduction to the concept of delegation, there is a method created by Apple called "textFieldShouldEndEditing" which is called by Apple whenever any keyboard will disappear on any text field.
This method is created by Apple, but you can override it (i.e. customize it) to suit your needs and tailor its behavior.
To override this method you have to assign your class as the delegate of UITextField by adding UITextFieldDelegate to your class definition as follows:
class YourClassName: UIViewController, UITextFieldDelegate { }
Now you have to set your class as the delegate by saying textField.delegate = self For every UITextField you create in your collection views
You then can re-create the method we discussed earlier in your class:
func textFieldShouldEndEditing(_ textField: UITextField) -> Bool {
//let's implement it the next steps, but for now, let's return true.
return true
}
Now instead of Apple calling their version of the method, they will call yours.
You then can create a variable in the top level of your class (I will let you know where this will be helpful later), and "maybe" name it as:
var isCellBeingClicked = false
Now upon clicking on a cell, make this variable true, I believe you are using the method didSelectRowAt (but you could be using any other method which is fine):
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
[...]
isCellBeingClicked = true
[...]
}
Now back to our customized method textFieldShouldEndEditing mentioned in step 3. You can add this implementation:
func textFieldShouldEndEditing(_ textField: UITextField) -> Bool {
//If a cell is being clicked right now, please do not dismiss the keyboard.
if isCellBeingClicked {
isCellBeingClicked = false //reset the value otherwise the keyboard will always be there
return false
}
else { return true }
}
Please let me know if this fixes your issue.
Best regards
how would I go about making a previously selectedRow of an NSTableView stay selected after the user presses a button calling a method to work with that selectedRow?
It worked in a previous programm looking like this:
selecting it gives it the OSX selection color, clicking the save button makes the textField becomeFirstResponder() which makes the row go grey automatically and doesnt change the selectedRow property. This is not done by my code, so im happy it just works.
Now in a similar program I want to achieve exactly this, but after clicking a button (calling a method making the textField becomeFirstResponder()) the visual selection is gone and also the tableView property selectedRow goes back to -1 (no row selected).
I tried a lot of ideas, most answers online are objective-C. Here is my most recent code (beeing called by the same button and pretty much faking what worked automatically before):
the NSTableViewAction method and the selectedRowCache variable:
var selectedRowCache = -1
#IBAction func alarmDataTableView(_ sender: NSTableView) {
selectedRowCache = alarmDataTableView.selectedRow
}
the buttonAction:
#IBAction func editAlarmButton(_ sender: NSButton) {
let row = alarmDataTableView.rowView(atRow: self.selectedRowCache, makeIfNecessary: false)
row?.backgroundColor = .blue
}
the selectedRowCache is just a variable that saves the selectedRow whenever the user selects a row (i dont want this).
no with this code the background color of the row doesnt do a thing (besides losing its selection after the button method is called).
the NSTableView is view based.
Thank you for any help!
I looked for posts for issues with all 3 functions listed in the title, but my problem is not discussed anywhere. Frankly, my problem is such that it defies logic IMHO.
On selection of a row in my view-based NSTableView, I want to show a "Save" button in my last (aka "Action") column. So on viewDidLoad() I created my orphan button. Then on tableViewSelectionDidChange() I remove it from the superview and add it to my column's NSTableCellView. When there's no row selected, there is no button to show. Simple. Below code works perfectly.
func tableViewSelectionDidChange(_ notification: Notification) {
let selectedRow = tableView.selectedRow
btnSave!.removeFromSuperview()
if selectedRow > -1,
let rowView = rowView(selectedRow),
let actionView = rowView.view(atColumn: Column.action.hashValue) as? NSTableCellView {
actionView.addSubview(btnSave!)
}
}
Wait. Did I say Perfect? It works as long as I use mouse to change the selected row, including selecting below the last row in table which removes selection and any button in previous selected row. However, when I use the keyboard Up/Down keys to change the selection, it does not work.
First I thought the function will get called only if I use mouse to change row selection. However, that's not true. That's true for tableViewSelectionIsChanging as per docs and as per facts. But for tableViewSelectionDidChange docs don't say it will only work when mouse is used and the facts bear that out. I put print statements and function does get called. I stepped through debugger as well. The mind boggling part is - the method to remove button from superview works, but the one to add button as subview does not work - and only if I use keyboard. How is it possible that the same exact code executes but I get two different outcomes?
Adding remaining functions
I use this to get selected row
private func rowView(_ rowIndex: Int, _ make: Bool = false) -> NSTableRowView? {
return tableView.rowView(atRow: rowIndex, makeIfNecessary: make)
}
I call this in viewDidLoad to create my orphan button
private func createButton() {
btnSave = NSButton(frame: NSRect(x: 10, y: 0, width: 22, height: 16))
btnSave?.title = "S"
btnSave?.setButtonType(.momentaryPushIn)
btnSave?.bezelStyle = .roundRect
}
I'm working on the "settings" portion of my app. When one of the cells is clicked, I need to transition to a new View Controller depending on which cell was clicked.
I have found a ton of answers, but they all seem to not go far enough. I understand how to set up a segue to a new view controller and I understand how to use didSelectRowAt Indexpath to show which cell was clicked. I can figure out the transition, but I can't figure out many different transitions based on which cell was clicked.
Is there a way to do this with dynamic cells or should I be using static?
If you have fixed amount of cells, I'd go for static cells. However if you want to use dynamic cells, you can create something like enum with cases that store row index.
fileprivate enum Row: Int {
case volume = 0
case notification = 1
}
Then in didSelectRowAt delegate method:
let row = Row(rawValue: indexPath.row)!
switch row {
case .volume:
// Navigate somewhere
case .notification:
// Navigate somewhere
}