I'm using editActionsForRowAtIndexPath with Swift to add a option to my app cells.
My app is a homework list app, where you can set its subject, its category, the date you need it ready for and add a description. Also, there is a option that when you swipe the cell to the left you will be able to set the homework as Done. To show that, I created a label and added it to the cell, that if the homework is pending, the label will be Pending. If it was set as done, it will be Concluded. The thing is that when I'm setting ONE cell as done, it is setting all the other cells, which is not what I want.
The code I'm using to say that I only want THIS cell to be set as done is this:
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
if let cell = tableView.dequeueReusableCellWithIdentifier("AtivCell") as? AtivCell {
if !isPending {
pendencia[indexPath.row] = false
saveData()
}
cell.configureCell(materias[indexPath.row], data: datas[indexPath.row], descricao: descricoes[indexPath.row], pendencia: pendencia[indexPath.row], categoria: categorias[indexPath.row])
return cell
} else {
return AtivCell()
}
}
Here is the entire project, I really need help, I don't think I did anything wrong.
I've tried deleting the app from my iPhone (where I'm testing), tried closing Xcode, tried everything, it just does not work!!!
Link: https://github.com/HenriqueDoura/Agenda/tree/master/agenda-app
You should be using dequeueReusableCellWithIdentifier with the forIndexpath parameter, which always returns a cell. The one you've used requires you to test if it's nil and create one, which you are doing in the else clause and then not initialising it.
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("AtivCell", forIndexPath: indexPath) as? AtivCell {
cell.configureCell(materias[indexPath.row], data: datas[indexPath.row], descricao: descricoes[indexPath.row], pendencia: pendencia[indexPath.row], categoria: categorias[indexPath.row])
return cell
}
You can use your current function if you want, but you need to declare cell as var, and create it if dequeue returns nil, and then set its values.
Also your !isPending code will not work properly. Within editActionsForRowAtIndexPath, you should be setting pendencia[indexPath.row] = false.
Related
Why the default style for the selectionStyle property in the tableview cell is not returned? I wrote a condition to check and the print command works, i.e. it shows that default style is returning. But the table cell is not grayed out, as it should be with the default style.
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let cell = tableView.cellForRow(at: indexPath)
if cell?.selectionStyle == .default {
cell?.selectionStyle = .none
print("none")
} else {
cell?.selectionStyle = .default
print("default")
}
}
I found a solution to the problem. The fact is that the return of the style works, it just is not visible, because the change is very fast.
To see how the cell selection style changes (white color changes to gray and vice versa) you just need to click on the cell and hold it pressed for a while. And then you can see how the cell is grayed out.
Ive been at this for a while but cant seem to crack it in swift
I want a user to be able to select an image in uicollectionView and for that image to appear in a detailed view controller, i can do this quite easily with a peice of text,
and i can do this when there is a static array of images preloaded. but i cant seem to get anywhere with a collectionview which is loaded with images from a camera.
I understand i need to use
override func performSegueWithIdentifier(identifier: String, sender: AnyObject?) {
}
and this function to isolated selected cell.
func collectionView(collectionView: UICollectionView, didDeselectItemAtIndexPath indexPath: NSIndexPath) {
}
I do have these outlets
#IBOutlet weak var collectionView: UICollectionView!
var images = [UIImage]()
image picker stores all images to this array by
images.insert(newImage, atIndex: 0)
when the array would be passed to the detailviewcontroller, i understand that would have to be copied into another local array and then how would i get the current image that was highlighted to be shown first, perhaps using indexPath.Row
Regards
I'm not using segues, and actually I don't quite understand what your problem is, but I'll try to show you how it could be achieved.
First of all, you have an array with images, so I believe your image should be accessed as images[indexPath.row]
let's suppose that you already have UIViewController class with UIImageView in it.
if so, you can write something like that:
func collectionView(collectionView: UICollectionView, didDeselectItemAtIndexPath indexPath: NSIndexPath) {
let myVC = MyViewController()
myVC.imageView.image = images[indexPath.row]
self.presentViewController(myVC, animated: true, completion: nil)
}
for modal or
func collectionView(collectionView: UICollectionView, didDeselectItemAtIndexPath indexPath: NSIndexPath) {
let myVC = MyViewController()
myVC.imageView.image = images[indexPath.row]
self.navigationController?.pushViewController(myVC, animated: true)
}
if you want to show it as navigational.
I believe that with segues it's basically the same but I think you have to use func prepareForSegue for, you know, preparing the segue (func performSegueWithIdentifier will just perform it). In prepareForSegue you should check identifier of your segue
if segue.identifier == "myIdentifier" {
//your code here
}
and if this identifier is right, put your commands to your myVC there.
I've a TableViewCell with a UITextView, which content is not aligned and cutted at bottom at the first display:
When I scroll down and then up to the top, everything is fine:
My cellForRowAtIndexPath to get the content from a fetchedResultsController is simple:
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("TextViewCell") as! TextViewCell
let data = self.fetchedResultsController.objectAtIndexPath(indexPath) as! NSManagedObject
let text = data.valueForKey("textDu")!.description
cell.textContentView.text = text
return cell
}
How can I get the result after scrolling after start???
Use sizeToFit() after adding content to your textContentView.
cell.textContentView.text = text
cell.textContentView.sizeToFit()
Make sure for sizing cell
override func viewDidLoad() {
super.viewDidLoad()
NSNotificationCenter.defaultCenter().addObserver(self,
selector: "onContentSizeChange:",
name: UIContentSizeCategoryDidChangeNotification,
object: nil)
tableView.estimatedRowHeight = 89
tableView.rowHeight = UITableViewAutomaticDimension
}
override func viewDidDisappear(animated: Bool) {
super.viewDidDisappear(animated)
NSNotificationCenter.defaultCenter().removeObserver(self)
}
func onContentSizeChange(notification: NSNotification) {
tableView.reloadData()
}
Hope it helps you.
In conjunction with #Ashish Kakkad's answer you may want to try to set heightDimensions in viewDidLoad or viewWillAppear:
yourTableView.estimatedRowHeight = 30.0 // Put a real estimate here
yourTableView.rowHeight = UITableViewAutomaticDimension
Use auto layout code to tie the bottom of the cells contentView to the bottom of the text box. When the text box resizes it'll expand the cell with it.
This is in addition to Asish's correct suggestion about automatic cell heights and is quite a high level suggestion as you need to do a few things to get auto layout working right in tableview cells but there's ample examples on that out on the web.
oh, oh. Think I found something. I removed the existing contraints and then I've tried to "add missing constaints". The result was thas the error "Failed to automatically update constraints". Seem's I've a problem with my storyboard-file...
I am learning how to use a table based app using Simon NG Swift Programming guide. I typed in the code verbatim and the Xcode environment gets stuck on the let cell = tableView line of code.
Can someone tell me what I am doing wrong?
import UIKit
class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
var restaurantNames = ["Cafe Deadend", "homei", "teakha", "cafe loius", "petite oyster", "royal oak", "for knee rest",
"jimmy johns", "mickey dee", "daddies big burgers"]
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int{
return restaurantNames.count
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cellIdentifier = "Cell"
let cell = tableView.dequeueReusableCellWithIdentifier(cellIdentifier, forIndexPath: indexPath) as UITableViewCell
// configure the cell
cell.textLabel?.text = restaurantNames[indexPath.row]
return cell
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
The first error I saw when running your code is this:
2015-02-17 16:28:05.645 delete-me-maps[8008:151860] *** Terminating app due
to uncaught exception 'NSInternalInconsistencyException', reason: 'unable to
dequeue a cell with identifier Cell - must register a nib or a class for the
identifier or connect a prototype cell in a storyboard'
If this is the error you're getting, then you need to add the following to viewDidLoad:
if let myTableView = self.tableView {
self.tableView!.registerClass(UITableViewCell.self, forCellReuseIdentifier: "Cell")
}
Otherwise dequeueReusableCellWithIdentifier does not know what kind of class to use for the cell.
Could you post the error message?
Also, wether the app builds or fails building is not only about the code in your .swift files, it's also about the correct tagging/identifying in your storyboard. Have you made sure you haven't messed up the cell identifiers on your project earlier?
You may simply need to set the prototype cell identifier to "Cell". (Make sure it is exactly the same as in the code).
Go to the storyboard, click on your tableview, click on the attributes.
Give yourself a prototype cell by changing it from 0 to 1.
Click on the prototype cell. Set the 'identifier' attribute to "cell".
I believe that you need to set the Prototype Cell to have the identifier "Cell". You do this by:
Going to Main.storyboard, clicking the cell in the Document Outline, then go to the Attributes Inspector and Type in Cell in the 'Identifier' field.
Ok, first time I have ever had to ask for help on here, usually I can search and find my answer but not this time. I have a table that displays a pictures and names. If one of them are selected it goes to another view and the data passes. However, I am trying to get that passed information to display in a table like: Name: (Passed Info), Age: (Passed Info), Gender: (Passed Info) etc. I know the data passes because I can display the info in a label, but I can not figure out how to get it to show in a table. Index issue? String Issue?
This is code that passes the info:
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
var detailsViewController: DetailsViewController = segue.destinationViewController as DetailsViewController
var horseIndex = appsTableView!.indexPathForSelectedRow()!.row
var selectedHorse = self.horses[horseIndex]
detailsViewController.horse = selectedHorse
This is the code on the controller getting the data where I want the table to display
class DetailsViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
#IBOutlet var tableView: UITableView!
#IBOutlet weak var titleLabel: UILabel!
var horse: Herd?
required init(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
}
override func viewDidLoad() {
super.viewDidLoad()
self.tableView.registerClass(UITableViewCell.self, forCellReuseIdentifier: "cell")
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return self.horse.count;
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
var cell:UITableViewCell = self.tableView.dequeueReusableCellWithIdentifier("cell") as UITableViewCell
cell.textLabel?.text = self.horse[indexPath.Row]
return cell
}
}
I get an error on the return self.horse.count stating not a member and an error on the self.horse[indexPath.Row] stating NSIndex does not have a member named row.
I feel like I am not unwrapping it properly or something, but I can not figure it out or find an answer in my searches. If you need more information please let me know and thanks in advance for any help.
CLARIFYING...
You correctly grab self.horses[horseIndex] in the segue method, so you've already done the work to get the 1 specific horse. No need to do it again. Is self.horses tied to the Herd type? Confusing why Herd shows up again in the DetailView - you don't seem to need it.
It sounds like what you actually want at this point is a tabular layout of the details of that single horse ... Correct? Like going from your entire "Contacts" list to the tabular view of a single contact?
That no longer involves the array of multiple horses, so your use of Herd? and herd.count aren't necessary. Use static labels or a static tableView to show the info from the 1 Horse.
WHAT'S YOUR DATA STRUCTURE & WHAT GOES IN DETAIL VIEW?
Presumably what you want to create (if you haven't already) is a Horse Type:
class Horse {
//you could use optional properties here, or require them for a fully initialized Horse.
let name:String?
let gender:String?
let breed:String?
var age:Int?
var restingHeartRate:Int?
init(name:String?, gender:String?, breed:String?, age:Int?, restingHeartRate:Int?) {
//set arguments passed in to respective properties of self...
}
func winTripleCrown() {
println("\(name!) Wins! Suck on that, Sea Biscuit!")
}
}
Ensure your horses array is declared to only take Horse instances, and fill it appropriately:
var horses = [Horse]()
let horse1 = Horse(name:"Bob" gender:"male" breed: "Yessir, I am a real horse" age:42 restingHeartRate: 30)
horses.append(horse1)
println(horses.count) //prints "1"
horses[0].winTripleCrown() //prints: "Bob Wins! Suck on that, Sea Biscuit!"
Use the Horse Type instead of Herd in the DetailViewController:
var horse: Horse? //nil until set in prepareForSegue
Then in the segue method:
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
...
detailsViewController.horse = selectedHorse
Now, assuming you only put properly created Horse instances into the initial array, and there IS one at the selectedIndex, you're guaranteed that the horse variable in DetailViewController is a Horse instance, and that it's the one selected in the 1st "overall" tableView.
CREATE THE DETAIL VIEW
EASY:
The easy solution at this point is to create a detailView layout with labels, images, etc and hook them up to #properties in the DetailViewController. Then map the Horse properties to the #IBOutlets. Done. No need to mess w/tableViews anymore - just fake it or use a scrollView to make it look like a table.
TABLEVIEW ROUTE
But if you want to use a UITableView, then you'd need the delegate methods like you're using... The difference is you need to look at the # of properties of the single Horse instance - not anything about the overall list of Horses in a Herd or total array.
You COULD hard-code the # of rows if you're certain the # and order of Horse properties will always be consistent:
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 5 //1 row per property in a `Horse` instance as defined above
}
However, if you want to account for more dynamic results (like an array of wins/losses, or a photo gallery of variable length) you'd need to have enough cells to map all the Horse properties. How can you do that with a custom type that isn't an array or dictionary?
In Swift, you can determine how many properties a Type has by creating a "Mirror" type and using it for introspection, to reflect info back to you like the count property missing above.
let horseMirror = reflect(self.horse)
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return self.horseMirror.count //should also return "5" but no longer hard-coded
}
And then in cellForRowAtIndexPath: you can switch on the indexPath to assign the various Horse properties to the labels (or images, etc) in the tableView cells. Create custom tableView cell types w/unique identifiers if you want to show different information, or stick w/built-in options:
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
var cell:UITableViewCell = self.tableView.dequeueReusableCellWithIdentifier("cell") as UITableViewCell
//haven't played w/this to see if the optionals are correct. Consider it psuedocode...
switch indexPath.row {
case 1: cell.textLabel.text = self.horse.name?
case 2: cell.textLabel.text = self.horse.gender?
case 3: cell.textLabel.text = self.horse.breed?
case 4: cell.textLabel.text = String(self.horse.age?)
case 5: cell.textLabel.text = String(self.horse.restingHeartRate?)
default: cell.textLabel.text = ""
}
return cell
}