I have 5 buttons within a UIStackView, and I want to find out which index is being selected, and later compare those indexes. My code right now gives me an Array.Index. I've tried both subviews and arrangedSubviews. Is there anyway I can turn this into an Integer? I can't figure it out. Thanks!!
if let selectedIndex = stackview.subviews.index(of: sender) {
}
// UPDATE
I kinda got what I wanted with:
let int = stackview.subviews.distance(from: stackview.subviews.startIndex, to: selectedIndex)
I'm still not sure if this is the most efficient way, but it does the job for now.
index(of:) return Int.
Also you should find your button in the arrangedSubviews, not in the subviews
Assuming your stack view contains only buttons, and each button is connected to this #IBAction, this should work:
#IBAction func didTap(_ sender: Any) {
// make sure the sender is a button
guard let btn = sender as? UIButton else { return }
// make sure the button's superview is a stack view
guard let stack = btn.superview as? UIStackView else { return }
// get the array of arranged subviews
let theArray = stack.arrangedSubviews
get the "index" of the tapped button
if let idx = theArray.index(of: btn) {
print(idx)
} else {
print("Should never fail...")
}
}
I would add a tag to each of your buttons (button.tag = index) then check the tag of your sender.
So then you can wire up each of your buttons to the same function with a sender parameter, then check if sender.tag == index.
Related
I'm using firebase. My code works but my issue is when I press the accept button, I want that index to be deleted from the collectionView and I want the table to reload right away right after. I can't use the slide to delete because I need it for another function.
This is in my cell class thats why I did not use self. to call the collectionView. This function is being called by a addTarget() method. I'm thinking maybe passing an indexPath as a parameter, but I don't know how to pass an indexPath.item as a parameter and also how to pass a parameter inside an addTarget() method.
func handleAccept(_ sender: UIButton) {
print("button pressed")
guard let artId = art?.artId else {return}
let approvedRef =
FIRDatabase.database().reference().child("approved_art")
approvedRef.updateChildValues([artId: 1])
let pendingRef =
FIRDatabase.database().reference().child("pending_art").child("\(artId)")
pendingRef.removeValue { (error, ref) in
if error != nil {
return
}
let layout = UICollectionViewFlowLayout()
let pendingArtCollectionViewController =
PendingArtsCollectionViewController(collectionViewLayout: layout)
DispatchQueue.main.async {
pendingArtCollectionViewController.collectionView?.reloadData()
}
}
}
You don't need to pass indexpath as argument, you can get the indexpath of the tableView in button action with the following code :
func handleAccept(_ sender: UIButton) {
let center = sender.center
let rootViewPoint = sender.superview!!.convert(center!, to: self.myTableView)
let currentIndexpath = myTableView.indexPathForRow(at: rootViewPoint)
}
In my swift app I have a UITableView with one static cell and many dynamic cells.
Static cell contains different fields, such as labels, map (taken from MapKit) and a button, that indicates whether user voted up or not.
Now, when user presses the button, I want to change its color, possibly without refreshing anything else.
So far my code looks like this:
var currentUserVote:Int = 0
func tableView(_ tview: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
if (indexPath as NSIndexPath).row == 0 {
let cell = tview.dequeueReusableCell(withIdentifier: "cellStatic") as! VideoDetailsCell
fetchScore(cell.score)
let voteUpImage = UIImage(named: "voteUp");
let tintedVoteUpImage = voteUpImage?.withRenderingMode(UIImageRenderingMode.alwaysTemplate)
cell.voteUpButton.setImage(tintedVoteUpImage, for: UIControlState())
checkUsersVote() { responseObject in
if(responseObject == 1) {
cell.voteUpButton.tintColor = orangeColor
} else if (responseObject == -1){
cell.voteUpButton.tintColor = greyColor
} else {
cell.voteUpButton.tintColor = greyColor
}
self.currentUserVote = responseObject
}
//map handling:
let regionRadius: CLLocationDistance = 1000
let initialLocation = CLLocation(latitude: latitude, longitude: longitude)
centerMapOnLocation(initialLocation, map: cell.mapView, radius: regionRadius)
//cell.mapView.isScrollEnabled = false
cell.mapView.delegate = self
.
.
.
return cell
} else {
//handle dynamic cells
}
}
So in the method above I'm checking if user voted already and based on that I'm setting different color on the button. I'm also centering the map on a specific point.
Now, since it's a static cell, I connected IBAction outlet to that button:
#IBAction func voteUpButtonAction(_ sender: AnyObject) {
if(currentUserVote == 1) {
self.vote(0)
}else if (currentUserVote == -1){
self.vote(1)
} else {
self.vote(1)
}
}
and the vote method works as follows:
func vote(_ vote: Int){
let indexPath = IndexPath(row: 0, section: 0)
let cell = tview.dequeueReusableCell(withIdentifier: "cellStatic") as! VideoDetailsCell
switch(vote) {
case 1:
cell.voteUpButton.tintColor = orangeColor
case 0:
cell.voteUpButton.tintColor = greyColor
case -1:
cell.voteUpButton.tintColor = greyColor
default:
cell.voteUpButton.tintColor = greyColor
}
tview.beginUpdates()
tview.reloadRows(at: [indexPath], with: .automatic)
tview.endUpdates()
currentUserVote = vote
//sending vote to my backend
}
My problem is, that when user taps the button, he invokes the method vote, then - based on the vote, the button changes color, but immediately after that method cellForRow is called and it changes the color of the button again. Also, it refreshes the map that's inside of it.
What I want to achieve is that when user taps the button, it should immediately change its color and that's it. Map stays untouched and the button is not changed again from cellForRow.
Is there a way of refreshing only that particular button without calling again cellForRow?
First of all, you confuse static and dynamic cells. You can use static cells only in the UITableViewController and you can't use static and dynamic cell at the same time.
I strongly recommend you not to use cell for storing map and button. All elements from the cell will be released after scrolling it beyond the screen.
I can advise you use TableViewHeaderView for this task. In this case you will be able set button and map view as #IBOutlet.
(See more about adding tableview headerView. You can also set it from interface builder.)
Another way is change tableView.contentInset and set your view with map and button as subview to tableView. This method is used when you need create Stretchy Headers.
It should be quite easy, simply do it in your button handler. The sender argument there is the button object that caused the action. When you were connecting it from IB there was a dropdown to select sender type, you may have missed it and the whole thing would have been obvious with UIButton type there.
Simply change your handler like this :
#IBAction func voteUpButtonAction(_ sender: UIButton) {
if(currentUserVote == 1) {
self.vote(0)
}else if (currentUserVote == -1){
self.vote(1)
} else {
self.vote(1)
}
sender.backgroundColor = yourFavouriteColor
}
Another approach would be to create an IBOutlet for your button, since its from a static cell, and then you would be able to reference it from any place in your view controller.
In this call:
func tableView(_ tview: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
I see it calls checkUsersVote() which I'm guessing should get the updated value set in the vote() call. Could the problem be that you aren't doing this
currentUserVote = vote
until after reloadRows() is called?
I have a method which generates several buttons, all with the same properties. The buttons are arranged vertically, like that:
What I need is that when each of them is clicked, it is capable of recognizing if it is the first one from the top, or the second one etc., printing "I'am the first/second/etc one".
How can I do it considering that the method they have is the same?
If all you need is an integer, use the tag property in UIView.
If you have an array of buttons…
var buttons: [UIButton]
you could sort them by their position in their superview to determine their order:
var sortedButtons: [UIButton] {
return buttons.sorted(by: { $0.frame.origin.y < $1.frame.origin.y })
}
and then get the index of a button (and vice-versa):
func index(of button: UIButton) -> Int {
return sortedButtons.index(of: button)
}
func button(at index: Int) -> UIButton? {
guard index < buttons.count else { return nil }
return sortedButtons[index]
}
Then…
#IBAction func buttonClicked(_ sender: UIButton) {
guard let index = index(of: sender) else { return }
sender.setTitle("I am \(index)", for: .normal)
}
This would also work if you added your buttons to an Outlet Collection in a storyboard:
#IBoutlet var buttons: [UIButton]!
Quick and dirty approach:
When dragging the outlet for the button, for the connection type select "Outlet Collection". This will create an outlet "to" a button array. Then you can drag and drop the rest of your buttons to this array. The order you make the drag n drop will be the order of your buttons in the array.
Then you can easily access them by index.
Caution: Easily breakable if re-drag n dropping the collection.
I have some buttons on the view. I don't know how many, I know that it can be minimum of 2 or maximum of 4. I want to check each button's title text and add to array true or false depending on value of title.
is it possible to do ?
Try below thing..
for view in self.view.subviews {
if view.isKindOfClass(UIButton){
// Add you logic over here.
// you can check the tag of button as well.
}
}
Yes, it is possible to iterate through all objects inside the view. To see all the subviews present in your view, you can do following:
for view in self.view.subviews as! [UIView] {
if let btn = view as? UIButton {
if btn.title == "whateverYourCriteriaIs" {
//your code
}
else {
//do something else
}
}
}
How would I loop through all UIButtons in my view in Swift? I would want to set all the titles to "", but my for-loop in Swift is giving an error.
for btns in self.view as [UIButton] {
// set the title to ""
}
This code should work:
for view in self.view.subviews as [UIView] {
if let btn = view as? UIButton {
btn.setTitleForAllStates("")
}
}
You need to iterate through the subViews array.
Shortened and updated for Swift 3 & 4
for case let button as UIButton in self.view.subviews {
button.setTitleForAllStates("")
}
Looping over subview works, but it's sometimes a little ugly, and has other issues.
If you need to loop over some specific buttons, for example to add corner radius or change tint or background color, you can use an array of IBOutlets and then loop over that.
var buttons = [SkipBtn, AllowBtn]
for button in buttons as! [UIButton] {
button.layer.cornerRadius = 5
}
Swift 4:
let subviewButtons = self.view.subviews.filter({$0.isKind(of: UIButton.self)})
for button in subviewButtons {
//do something
}
To add some context for a common use case, suppose the buttons were in a scroll view and you wanted to highlight the tapped button and de-highlight the other buttons. In this situation, you would direct all buttons to one action method:
#objc private func buttonAction(_ button: UIButton) {
for case let b as UIButton in view.scrollView.subviews {
if b == button {
b.setTitleColor(UIColor.green, for: []) // highlight
} else {
b.setTitleColor(UIColor.black, for: []) // de-highlight
}
}
}
This code seems to be quite useful for iterating over any object within a view, just change UIButton for any other subview type such as UIView or UIImageView, etc.
let filteredSubviews = self.view.subviews.filter({
$0.isKindOfClass(UIButton)})
for view in filteredSubviews {
//Do something
}
Used some of the offered questions out there and created my own. I believe is the most efficient when you want to programmatically set up the title of various UIButtons(in my case I am building a quiz)
By randomising my array list and with just a for loop I printing the item at index to the button title
for view in self.viewForButtons.subviews{
if view.isKindOfClass(UIButton)
{
let button : UIButton = view as! UIButton
button.setTitle("item[i]", forState: .Normal)
}
}
If you have UIView's within self.view then you need to loop through the subviews while searching for UIButton. Using the accepted answer, I made this little function to do so:
Swift 4 + :
func findButton(`in` view: UIView){
for view in view.subviews as [UIView] {
if let button = view as? UIButton {
// Do something with 'button'
}else{
// Loop through subview looking for buttons
findButton(in: view)
}
}
}
Usage:
override func viewDidLoad() {
findButton(in: self.view)
}
Hope this helps!
Here's a short way in Swift if you know the subview only has buttons:
myView.subviews.map {
($0 as? UIButton)!.enabled = false
}