I got an issue when I pass the UITableView data to detailViewcontroller like this any one please help me correct this error
Got your problem,
Step : - IN detailViewcontroller, define variable like that
var getImage = UIImage()
var getTitle = String()
As far as I can see newDetails is an array of dictionary with key and value. You can access the image or anything within a dictionary using its key.
if let image = newsDetails[indexPath.row]["yourImageKeyNameFromNewsDetails"] as? String {
Storyboard?.getImage = UIImage(named: image) ?? UIImage(named: "yourPlaceHolderImage")
}
I hope this explains you.
Hello Madushan Senavirathna,
From your provided images, I see that newsDetails is array of [Sting:Any] which will return object of [String:Any].
But you are assigning object to image and string which I observe from given image like :
Storyboard?.getImage = newsDetails[indexPath.row]
Storyboard?.getTitle = newsDetails[indexPath.row]
I found that problem is in above syntax.
Ideal syntax to get images from your object are as below :
if let imageString : String = newsDetails[indexPath.row]["imageKeyFromObject"]
{
Storyboard?.getImage = You need to handle image string as per your requirement (if local file name than handle it with UIImage(named: imageString) or if it is dynamic content from server then you have to handle it with url)
}
Use this code to pass data from tableview diselect to details page view controller and in that detail page view controller need to declare that variable correctly..
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
if let cellData = newsDetails[indexPath.row] {
if let vc = YourDetail page ViewController as? DetailPageController {
vc.details = cellData
self.navigationController?.pushViewController(vc, animated: true)
}
}
}
Related
I am writing swift code with the goal of displaying a increasing number on every tableview cell. Right now the int is not being display. So the first tableview cell should say 1 and the 2nd should say 2. You can see in the gif below what is going along with the tableview cell and nothing is appearing in them when the button is clicked. The func below is when the button is clicked.
var pageNumber = 1
var itemName : [Player] = []
func enterData() {
theScores.reloadData()
let appDeldeaget = UIApplication.shared.delegate as! AppDelegate
let context = appDeldeaget.persistentContainer.viewContext
// Simpler way to create a new Core Data object
let theTitle = Player(context: context)
// Simpler way to set the position attribute
theTitle.positon = Int64(pageNumber)
print(pageNumber)
// pageNumber must be of type Int64, otherwise use Int64(pageNumber)
do {
try context.save()
itemName.append(theTitle)
pageNumber += 1
} catch {
// handle errors
}
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let title = itemName[indexPath.row]
let cell = theScores.dequeueReusableCell(withIdentifier: "MyCell", for : indexPath)
cell.selectionStyle = .default
let attr5 = title.value(forKey: "positon") as? String
let text = [" Item :", attr5].compactMap { $0 }.reduce("", +)
cell.textLabel?.text = "\(text)"
cell.textLabel?.textAlignment = .center
cell.layoutMargins = UIEdgeInsets.zero
cell.preservesSuperviewLayoutMargins = false
cell.separatorInset = UIEdgeInsets.zero
cell.layoutMargins = UIEdgeInsets.zero
return cell
}
Here's why it doesn't work. You have this:
let attr5 = title.value(forKey: "positon") as? String
let text = [" Item :", attr5].compactMap { $0 }.reduce("", +)
This is a really complicated way to try and do this, and it doesn't work as written. The problem is that the value of position is an Int64 and you need a string. But using as? like that doesn't turn it into a string. When that line of code runs, Swift says, can I just make this into a string? But it can't. So the as? String is nil, and your table cells don't include the number because the conversion failed.
A better way would be something like
if let position = title.value(forKey: "positon") {
cell.textLabel?.text = "Item : \(positon))"
}
But that's only if you really want to use value(forKey:) for some reason. You probably don't need that because normally Xcode creates a subclass of NSManagedObject for each entity with named properties. So even better would be
cell.textLabel?.text = "Item: \(title.position)"
These both work because string interpolation knows how to convert an integer to a string.
You probably should call .reloadData() after context.save()
I would like two display Object data gotten from Parse in swift. I have tried using label in this way but it only displays the last element in the object. Please how can I make it display all the element in the object in the label. Like one element to one label. Thanks
let query = PFQuery(className: "Questionnaire")
query.findObjectsInBackground { (objects, error) -> Void in
if error == nil {
// There were no errors in the fetch
if let returnedObjects = objects {
// var text = ""
// Objects Array is not nil
// loop through the array to get each object
for object in returnedObjects {
print(object["question"] as! String)
// text.append(object["question"] as! String)
self.Label.text = (object["question"] as! String)
}
}
}
}
You can do in one line like that and join all question with , separator , you can change separator to any (empty, -,...etc)
if let returnedObjects = returnedObjects {
self.Label.text = returnedObjects.map {($0["question"] as? String) ?? nil}.compactMap({$0}).joined(separator: ",")
}
Use tableview for this.
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! YouTableViewCell
cell.textLabel.text = yourArray[indexpath.row] as? String ?? ""
return cell
}
If it's important to use UILabel
var concatenatedString = ""
for object in returnedObjects {
concatenatedString += object["question"] as! String
}
self.Label.text = concatenatedString
You are looping through the array and setting each value to Label.text. However, setting Label.text will replace what was on the label before. That's why you only see the last item.
One solution is to display the string representation of the array:
self.Label.text = "\(object)"
Another solution is to display the items in a table view Suganya Marlin has suggested. You would need to conform to UITableViewDatasource and implement the various methods. Here is a guide.
So iv using an NSTokenField to allow data entry, the TokenField will suggest thing when the user starts typing. I want it to suggest things that are already inside core data.
To do this i have this function being called when the cell moves to superview (This is all happening inside a custom table view cell)
var subjectInformation = [NSManagedObject]()
let appDel = NSApplication.sharedApplication().delegate as! AppDelegate
let context = appDel.managedObjectContext
let fetchRequest = NSFetchRequest(entityName: "SubjectInformation")
do {
let results = try context.executeFetchRequest(fetchRequest)
subjectInformation = results as! [NSManagedObject]
} catch {
}
this returns an array of NSManagedObjects, now i want for every object in managed object get get the valueForKey("subjectName") as insert it into a array of string so that i can return that inside this token field Function
func tokenField(tokenField: NSTokenField, completionsForSubstring substring: String, indexOfToken tokenIndex: Int, indexOfSelectedItem selectedIndex: UnsafeMutablePointer<Int>) -> [AnyObject]? {
return subjectInformation //this is where is should return an array eg; ["English","Maths","Science"]
How would i do this? Thanks :)
If you properly subclassed your NSManagedObject you can use expressive Swift style filters and maps. You would cast your results array to [SubjectInformation] and
let subjectList = subjectInformation.map { $0.subjectName }
Try this:
(subjectInformation as! NSArray).valueForKeyPath("#unionOfObjects.subjectName")
This should return an array of the subjectNames of all the subjectInformation items.
Ok so I've been trying to make a like button for an app I'm working on and I'm using parse as a backend. So far I can update the like button in parse, however, I can only reload the entire tableview not just the single cell. Reloading the entire tableview sometimes causes the tableview to move up or down I believe because of different sized cells.
#IBAction func topButton(sender: UIButton) {
let uuid = UIDevice.currentDevice().identifierForVendor.UUIDString
let hitPoint = sender.convertPoint(CGPointZero, toView: self.tableView)
let hitIndex = self.tableView.indexPathForRowAtPoint(hitPoint)
let object = objectAtIndexPath(hitIndex)
let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: hitIndex!) as TableViewCell
//var indexOfCell:NSIndexPath
//indexOfCell = hitIndex!
if object.valueForKey("likedBy") != nil {
var UUIDarray = object.valueForKey("likedBy")? as NSArray
var uuidArray:[String] = UUIDarray as [String]
if !isStringPresentInArray(uuidArray, str: uuid) {
object.addObject(uuid, forKey: "likedBy")
object.incrementKey("count")
object.saveInBackground()
//self.tableView.reloadData()
}
}
}
I've already tried the cellForRow with the proper indexPath and it always returns that PFTableViewCell does not contain the cellForRowAtIndexPath method. I read on a forum that someone was able to create a custom method to reload the cell and Parse's documentation uses PAPCache to do the like button. Lucky for me the documentation for the like button on Parse's page is in Obj-C and I've coded my app in Swift. Here's the link to the page if you want to see: https://www.parse.com/tutorials/anypic#like. Section 6.1.
TD;LR I'm unsure how to update the cell so the entire tableview does not get reloaded without the cellForRowAtIndexPath method. Maybe Custom method? Maybe PAPCache method?
SOLVED
if object.valueForKey("likedBy") != nil {
var UUIDarray = object.valueForKey("likedBy")? as NSArray
var uuidArray:[String] = UUIDarray as [String]
if !isStringPresentInArray(uuidArray, str: uuid) {
object.addObject(uuid, forKey: "likedBy")
object.incrementKey("count")
object.saveInBackground()
let count = object.valueForKey("count") as Int?
//cell.count.text = "\(count)"
self.tableView.reloadRowsAtIndexPaths([hitIndex!], withRowAnimation: UITableViewRowAnimation.None)
This properly reloads only the cell, however, now my entire tableview always scrolls to the top which is not ideal.
I don't understand what are you trying to with the UUID; hitpoint ;hitIndex, and I don't understand what you want your app to do and I don't have and experience with parse ? I would comment on your question,but I need 50 rep to do this.Sorry that this isn't an answer,but a question .And if you are referring about cellForRowAtIndexPath,you need a UITableView not a cell.
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as UITableViewCell
var query = PFQuery(className:"category")
let object = objects[indexPath.row] as String
query.whereKey("type", equalTo:"DRUM")
query.findObjectsInBackgroundWithBlock {
(objects: [AnyObject]!, error: NSError!) -> Void in
if error == nil {
for object in objects {
NSLog("%#", object.objectId)
let abc = object["link"]
println("the web is \(abc)")
cell.textLabel!.text = "\(abc)"
}
} else {
NSLog("Error: %# %#", error, error.userInfo!)
}
}
return cell
}
after add the let object = objects[indexPath.row] as String can't load the view, delete the line show only one row successfully.
First I advise you to get your cell data outside cellForRowAtIndexPath. This function is not a good place to receive data from parse. Make another function and create a class variable and put handle getting data from there.
let object = objects[indexPath.row] as String
for object in objects
Try not to use same variable names for different stuff, as they will confuse you.
This line is not contributing to anything at the moment it seems. Try deleting it:
let object = objects[indexPath.row] as String
First lets have principles in mind. Don't ever update UI from a separate thread, its behavior is unexpected or undefined. It works or works weird.
Second, the problem you have is the when the VC gets loaded the tableView's datasource is called there and then on the main thread. Now you tried to add something on the cell by doing a Async call in separate thread which will take time and main thread is not waiting when the call to parse is being done. If you have difficulty in Async please take a look at the documentation its really important to get a good grasp of the few terms and the principles.
The thing is your main thread runs top to bottom without waiting each call to server thats async in the cell generation. So the result of that call will post later on and you are not posting on main thread too.
Moreover, i would suggest you don't do this approach for big projects or manageable code base. I generally do is:
when the view loads call the Parse with the needed information
Wait for that on a computed variable which i will observe to reload table views once I'm conformed i have the data.
Initially table view will have 0 rows and thats fine. Ill make a spinner dance during that time.
I hope i made some issues clear. Hope it helps you. Cheers!
//a computed var that is initialized to empty array of string or anything you like
//we are observing the value of datas. Observer Pattern.
var datas = [String](){
didSet{
dispatch_async(dispatch_get_main_queue(), {
//we might be called from the parse block which executes in seperate thread
tableView.reloadData()
})
}
}
func viewDidLoad(){
super.viewDidLoad()
//call the parse to fetch the data and store in the above variable
//when this succeeds then the table will be reloaded automatically
getDataFromParse()
}
//get the data: make it specific to your needs
func getDataFromParse(){
var query = PFQuery(className:"category")
//let object = objects[indexPath.row] as String //where do you use this in this block
var tempHolder = [String]()
query.whereKey("type", equalTo:"DRUM")
query.findObjectsInBackgroundWithBlock {
(objects: [AnyObject]?, error: NSError?) -> Void in
if error == nil && objects != nil {
for object in objects!{
//dont forget to cast it to PFObject
let abc = (object as! PFObject).objectForKey("link") as? String ?? "" //or as! String
println("the web is \(abc)")
tempHolder.append(abc)
}
} else {
print("error") //do some checks here
}
}
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as! UITableViewCell
cell.textLabel!.text = datas[indexPath.row]
return cell
}