I've got a class where I handle my touches functions on buttons, and those buttons are also a Post class.
The logic I'm going for is "If the post.user is equal to the current firebaseuser, don't allow the user to move the button"
Here's what I tried:
In my "DragButtonsClass" I've got a notification being sent to my view controller on TouchesBegan.
In the view I've got
func touchesStarted(notif : NSNotification) {
if let dict = notif.userInfo! as? [NSObject: AnyObject] {
let tag = dict["tag"]!
let tagInt = Int(String((tag))) //this is probably super sloppy, don't know how else to change an AnyObject to an Int though.
let post = postArray[tagInt! - 1]
let postbutton = self.view.viewWithTag(tagInt!)
if post.user == currentUser {
postbutton?.userInteractionEnabled = false
print("Should be working")
} else {
print("Didn't work")
}
}
}
Basically I'm assigning tags to the buttons as they're created and those tags line up with my Posts array. I'm trying to check if the Post's user is the same as the current user by sending it over and then shut off user interaction.
I'm getting "Should be working" to print out but the button is still draggable.
This seems like a super sloppy and roundabout way to do this and most importantly it isn't working. I've read that turning off userInteraction is a way to stop touches from being recognized.
Any ideas?
Ended up just setting a bool "canBeDragged" in my button's class, and when the button is created the current user's ID is compared to the information being pulled from firebase and the bool is set. Then I just checked if the button could be dragged before my touchesMoved.
Related
I have a dynamic UITableView. For each cell, I add a UIAccessibilityCustomAction. When the action fires, I need to know the index path so I can respond accordingly and update my model.
In tableView(_:cellForRowAt:) I add my UIAccessibilityCustomAction like this...
cell.accessibilityCustomActions = [
UIAccessibilityCustomAction(
name: "Really Bad Name",
target: self,
selector: #selector(doSomething)
)
]
I have tried to use UIAccessibility.focusedElement to no avail...
#objc private func doSomething() {
let focusedCell = UIAccessibility.focusedElement(using: UIAccessibility.AssistiveTechnologyIdentifier.notificationVoiceOver) as! UITableViewCell
// Do something with the cell, like find the indexPath.
}
The problem is that casting to a cell fails. The debugger says that the return value type is actually a UITableTextAccessibilityElement, which I could find no information on.
When the action fires, I need to know the index path so I can respond accordingly and update my model.
The best way to reach your goal is to use the UIAccessibilityFocus informal protocol methods by overriding them in your object directly (the table view cell class in your case): you'll be able to catch the needed index path when a custom action is fired.
I suggest to take a look at this answer dealing with catching accessibility focus changed that contains a detailed solution with code snippets if need be.😉
Example snippet...
class SomeCell: UITableViewCell
override open func accessibilityElementDidBecomeFocused() {
// Notify view controller however you want (delegation, closure, etc.)
}
}
I ended up having to solve this myself to bodge an Apple bug. You've likely solved this problem, but this is an option similar to your first suggestion.
func accessibilityCurrentlySelectedIndexPath() -> IndexPath? {
let focusedElement:Any
if let voiceOverObject = UIAccessibility.focusedElement(using: UIAccessibility.AssistiveTechnologyIdentifier.notificationVoiceOver) {
focusedElement = voiceOverObject
} else if let switchControlObject = UIAccessibility.focusedElement(using: UIAccessibility.AssistiveTechnologyIdentifier.notificationSwitchControl) {
focusedElement = switchControlObject
} else {
return nil
}
let accessibilityScreenFrame:CGRect
if let view = focusedElement as? UIView {
accessibilityScreenFrame = view.accessibilityFrame
} else if let accessibilityElement = focusedElement as? UIAccessibilityElement {
accessibilityScreenFrame = accessibilityElement.accessibilityFrame
} else {
return nil
}
let tableViewPoint = UIApplication.shared.keyWindow!.convert(accessibilityScreenFrame.origin, to: tableView)
return tableView.indexPathForRow(at: tableViewPoint)
}
What we're essentially doing here is getting the focused rect (in screen coordinates) and then translating it back to the table view's coordinate space. We can then ask the table view for the indexpath which contains that point. Simple and sweet, though if you're using multi-window you may need to swap UIApplication.shared.keyWindow! with something more appropriate. Note that we deal with the issue you faced where the element was a UITableTextAccessibilityElement when we handle UIAccessibilityElement since UITableTextAccessibilityElement is a private, internal Apple class.
I was wondering how to create a favorite button in swift that when that button is pressed the object that is "favorited" becomes part of a tableview and stays that way. I hear that core data is a way to do this, but I am still struggling to have the button change when pressed.
When I was creating a button all I get is a button that only changes the first time it presses. An example is I have an empty star button, which means that it is not a favorite, and when i pressed it it changes to a filled heart, which means that it is favorited. When I press the button a second time, when it is currently a filled star, it doesn't change and still remains a filled star.
The other problem that I am having is sending the information from the object to a favorite tableview. I am not sure how to keep something in a tableview as long as the favorite button is switched to filled star.
What I am seeing a lot of is this topic but it is all about making a favorite button in table views. I am not looking for tableviews. An example of what I am trying to do is like a favorite book app. The app opens as a tableview full of books, and when a cell is pressed it opens a new view controller with that book's information, and at the top is a favorite button that is normally an empty star. If I like that book I would like to press that button and the empty star becomes a filled star button, indicating that I like it. The book's information is then sent to a new table view that holds all of the liked books i have done before. If I no longer like that book i would like to press the filled star button again and it is removed from the favorite tableview list.
I am some experience with mysql in regards to swift, and I know that someone people have made comments about using some kind of persistence to save the state of the button.
My biggest problem is that I don't even know where to start. Every attempt I make seems to end the same way, so i don't really have any source code for others to see. I have looked online and through github but the closest thing I could find was a cocoapod named DoButton, but it hasn't been updated in a long time and I am worried that it won't last with another swift update. If someone could lead me in the right path or know a good tutorial, I would greatly appreciate it. If there are any questions I can answer i will answer them to the best of my ability.
Another Update: I managed to get the button to work. It connects to core data and saves the state of the button even when it is quit. Now all that is left is creating a favorite tableView to store the favorites.
Here is the code:
class ViewController: UIViewController {
var buttonIsSelected = false
var favorites = [Favorite]()
#IBOutlet var onOffButton: UIButton!
let image1 = UIImage(named: "empty") as UIImage?
let image2 = UIImage(named: "filled") as UIImage?
override func viewDidLoad() {
super.viewDidLoad()
print("buttonIsSelected: \(buttonIsSelected)")
let fetchedRequest: NSFetchRequest<Favorite> = Favorite.fetchRequest()
do {
let favorite = try PersistenceService.context.fetch(fetchedRequest)
for fav in favorite {
resetAllRecord(entity: fav.favorite)
buttonIsSelected = fav.favorite
print("fav.favorite: \(fav.favorite)")
print("button: \(buttonIsSelected)")
if fav.favorite == true {
onOffButton.setImage(image2, for: .normal)
}
}
} catch {
}
}
//button Action
#IBAction func onOffButtonPressed(_ sender: Any) {
buttonIsSelected = !buttonIsSelected
if buttonIsSelected == true {
onOffButton.setImage(image2, for: .normal)
} else if buttonIsSelected == false {
onOffButton.setImage(image1, for: .normal)
}
saveBool(bool: buttonIsSelected)
}
//save to core data
func saveBool(bool: Bool) {
if bool == true {
print("favorite")
print("buttonIsSelected \(buttonIsSelected)")
let liked = Favorite(context: PersistenceService.context)
liked.favorite = bool
PersistenceService.saveContext()
favorites.append(liked)
} else if bool == false {
print("unfavorite")
print("buttonIsSelected \(buttonIsSelected)")
let liked = Favorite(context: PersistenceService.context)
liked.favorite = bool
PersistenceService.saveContext()
favorites.append(liked)
}
}
//clears core data so it doens't get full
func resetAllRecord(entity: Bool) {
let context = PersistenceService.persistentContainer.viewContext
let deleteFetch = NSFetchRequest<NSFetchRequestResult>(entityName: "Favorite")
let deleteRequest = NSBatchDeleteRequest(fetchRequest: deleteFetch)
do
{
try context.execute(deleteRequest)
try context.save()
}
catch
{
print ("There was an error")
}
}
}
In the object class create a bool parameter called isFavorite and default set it to false. When the favorite button is pressed the bool should change from false to true. When you have to access only the "favorite" objects, with a for loop iterate through your array of objects and through an if statement check if the isFavorite parameter is true. If it is, the element must be appended to a new object array maybe called favoriteObjects, and there you have all your favorite objects. The rest is pretty straightforward.
Situation as it should be
We have a today widget that shows a maximum of 6 buttons depending on data set in the corresponding app. This data is shared using app-groups. If at least one button is configured it will show up as shown in the image above. If the user is not logged in, or if no buttons are configured, it will show a message as shown in the image below.
Problem
After several hours (somewhere between 4 and 7) of not having opened the app, the widget reverts to the 'No buttons configured' view.
Analysis so far
The way the data is loaded from the app-group is done using the code as shown below. (gist for full code) In the way I had written it, the only way the 'No buttons configured' view can be shown is if the buttons array actually exists but has a length of zero.
I expected something like a cache clearing or a background service stopping, but as far as I can see, exceptions should be caught earlier:
If no connection could be made to the app-group data, userDefaults should be nil, so it should show the 'Not logged in view'.
In case the buttons were never defined, buttons should be nil and so again it should show the 'Not logged in view'
Considering the app does nothing in the background, the app itself could not be changing the buttons.
I tried reproducing this while having the debugger connected, but the problem will not reproduce.
Does anyone even have the slightest idea on how to fix this issue or how to start debugging this?
Relevant files:
TodayViewController
Cordova Plugin
Relevant code:
private struct sharedData {
static var baseUrl: String?
static var token: String?
static var phoneDeviceId: String?
static var buttons: Array<Button>?
}
func loadData() {
let groupIdentifier = "group." + NSBundle.mainBundle().bundleIdentifier!
var groupIdArray = groupIdentifier.componentsSeparatedByString(".")
groupIdArray.removeAtIndex(groupIdArray.count - 1)
let appGroupIdentifier = groupIdArray.joinWithSeparator(".");
let userDefaults = NSUserDefaults.init(suiteName: appGroupIdentifier)
if (userDefaults == nil) {
print("Error in user defaults")
setButtonTitle("Not logged in. Open Triggi to continue.")
return false
}
sharedData.baseUrl = userDefaults?.valueForKey("baseUrl") as? String
sharedData.token = userDefaults?.valueForKey("token") as? String
sharedData.phoneDeviceId = userDefaults?.valueForKey("phoneDeviceId") as? String
let buttons = userDefaults?.valueForKey("buttons") as? NSArray
if (sharedData.baseUrl == nil || sharedData.token == nil || sharedData.phoneDeviceId == nil || buttons == nil) {
print("Missing data")
setButtonTitle("Not logged in. Open Triggi to continue.")
return false
}
if (buttons?.count == 0) {
print("No buttons configured")
setButtonTitle("No buttons configured. Open Triggi to continue.")
return false;
}
// More things are done with the data here
}
Today Extension Controller is a UIViewController and thus follows the same lifecycle as that of a UIViewController. So, the lifecycle method viewDidLoad() is called everytime whenever the widget is loaded.
Also, widgetPerformUpdateWithCompletionHandler is called:
when widget is updated in background
before widget snapshot is taken
So, instead of just calling loadData() in widgetPerformUpdateWithCompletionHandler, also call it from viewDidLoad().
Also, where have you written the code to add/remove UIButtons from superview and to show "No buttons configured" in your code?
I have a custom view with UIPanGestureRecognizer, UIRotationGestureRecognizer, UIPinchGestureRecognizer
User can keep adding this views in the view controller by using add button.
Entire view controller should be saved as draft, so he can come and edit his stuff when ever he feels
I tried
Method 1 :
Saving this in var and sending back to previous Viewcontroller and getting it back. But when user restarts the app, it goes away.
Method 2 :
I tried saving in UserDefaults.
for let TxtBoxVar as UITextField in self.view.subviews
{
TxtCwtVar+=1
let TxtDataVar = NSKeyedArchiver.archivedDataWithRootObject(TxtBoxVar)
DftSdbVal.setObject(TxtDataVar, forKey: "TxtBox\(TxtCwtVar)_Key")
}
But this is ignoring all gesture of the view while saving. That means user cannot pinch or pan on the views after getting it back using beow method
let TxtCwtVal = DftSdbVal.integerForKey("TxtCwtKey")
for TxtCwtVar in 1...TxtCwtVal
{
if let VyuDtaVar = DftSdbVal.objectForKey("TxtBox\(TxtCwtVar)_Key")
{
if let VyuVar = NSKeyedUnarchiver.unarchiveObjectWithData(VyuDtaVar as! NSData) as? UITextField
{
self.view.addSubview(VyuVar)
}
}
}
Is there a better way of doing this or can we store an instance alternatively with gestures ?
A quick overview of what I'm trying to make. I'm making an app to show my film reviews. I have a PFQueryTableviewController of which I use a custom cell. This table shows films which come from my Parse database. In each cell, there a 3 UIButtons, of which I want the user to use to vote for the film (happyVote, OkVote, sadVote). Over the top of each button is a UILabel that simply displays a count.
How I want it to work
When a user presses one of the buttons, the vote increases by 1.
When a user presses the same button again, the vote decreases by 1. Or,
If the user had pressed a different button, the vote decreases on the first button and increases on the button just pressed.
The user can only ever vote on one of the buttons.
The vote is shown by the UILabel showing the count, and by the button image changing.
See below for a visual:
This is what I've added in Parse:
So far, I've added the code to increase the vote count in Parse, in my TableViewController.swift:
#IBAction func upVoteButton(sender: AnyObject) {
let hitPoint = sender.convertPoint(CGPointZero, toView: self.tableView)
let hitIndex = self.tableView.indexPathForRowAtPoint(hitPoint)
let object = objectAtIndexPath(hitIndex)
object!.incrementKey("UpVoteCount")
object!.saveInBackground()
self.tableView.reloadData()
}
This kind of works, except, the user can keep increasing the count, and they can vote on all 3 buttons. And it doesn't change the Button Image when pressed.
In my cellForRowAtIndexPath method, I've put:
let downVote = object!.valueForKey("DownVoteCount") as! Int
cell.downVoteLabel.text = "\(downVote)"
let middleVote = object!.valueForKey("MiddleVoteCount") as! Int
cell.middleVoteLabel.text = "\(middleVote)"
let upVote = object!.valueForKey("UpVoteCount") as! Int
cell.upVoteLabel.text = "\(upVote)"
I have searched for a while for some examples of how to figure the rest out, but can't find anything, and I'm really struggling to figure the next steps out.
Any help will be greatly appreciated, and please let me know if you need/want to see anymore of my code. Thanks
In your upVoteButton() method, you can add the other two buttons and set them button.enabled = false inside an if statement like:
if downVoteButton.enabled == true {
downVoteButton.enabled = false
} else if downVoteButton.enabled == false {
downVoteButton.enabled = True
}
And do the same with the middleVoteButton in antoher if statement or the same, whatever floats your boat, also within the other button methods with the appropriate buttons. This helps disables the buttons when pressed and then enables it when it's pressed again.
And for the image changing you can follow this.