I have added a tableview and as well configured the cell with an identifier.
Everything works fine, the text of the cell gets displayed.
I have just one problem and don't know how to solve it.
How can I change the image of the tableview cell?
Here is my code:
func tableView(tableView: NSTableView, viewForTableColumn tableColumn: NSTableColumn?, row: Int) -> NSView? {
let cellView = tableView.makeViewWithIdentifier("cell", owner: self) as! NSTableCellView
cellView.textField!.stringValue = self.objects.objectAtIndex(row) as! String
return cellView
}
How can I change the image which is also present inside the cell?
The standard NSTableCellView with text and image has an outlet imageView
cellView.imageView!.image = NSImage(named:"MyImage")
Related
Is there any way to merge cell's in a NSTableView?
I know there are two modes for displaying data in a NSTableView: cell-based and view-based. If the data are presented by cells, the function
tableView(_ tableView: NSTableView, viewFor tableColumn: NSTableColumn?, row: Int)
is responsable, otherwise
tableView(_ tableView: NSTableView, rowViewForRow row: Int)
Currently I'm using the first one. In iOS, you can use the cell prototype in interface builder to link the views with a custom UITableViewCell, but how can I achieve this for a complete row in a NSTableView?
Maybe I found a solution: You can use both
tableView(_:viewFor:row:)
and
tableView(:viewFor:tableColumn:row:)
but you have to be aware that the tableView is not using both methods for one cell (mutually exclusive).
Now you can define a xib, with a single UIView in it. Change the class of the UIView to NSTableRowView. Next, load the class in viewDidLoad into your table:
if let nib: NSNib = NSNib(nibNamed: NSNib.Name("SpecialRow"), bundle: nil) {
self.tableView?.register(nib, forIdentifier: NSUserInterfaceItemIdentifier("specialRow"));
}
In your table method rowViewForRow you can do the following:
if let srow: SpecialRow = tableView.makeView(withIdentifier: NSUserInterfaceItemIdentifier(rawValue: "specialRow"), owner: nil) as? SpecialRow {
// ...
return srow;
}
I am working on building MacOS app. I am trying to make table view that updates the cell when I press add button.
Following is my code:
func tableView(_ tableView: NSTableView, viewFor tableColumn: NSTableColumn?, row: Int) -> NSView? {
let identifier = tableColumn?.identifier as NSString?
if ( identifier == "NameCell")
{
var result: NSTableCellView
let cell = tableView.make(withIdentifier: "NameCell", owner: self) as! NSTableCellView
cell.textField?.stringValue = self.data[row].setting!
return cell
}
else if (identifier == "SettingCell")
{
if let cell = tableView.make(withIdentifier: "SettingCell", owner: self) as? NSTableCellView {
cell.textField?.stringValue = self.data[row].setting!
return cell
}
}
return nil
}
However, the line let cell = tableView.make(withIdentifier: "NameCell", owner: self) as! NSTableCellView is keep failing because it returns nil
fatal error: unexpectedly found nil while unwrapping an Optional value
NameCell is from
Can anyone please help me find a way to solve this problem?
For anyone else who comes here with this same question when trying to make an NSTableView fully programmatically: makeView(withIdentifier:owner:) WILL return nil unless a corresponding NIB exists for the given identifier:
NSTableView documentation:
If a view with the specified identifier can’t be instantiated from the nib file or found in the reuse queue, this method returns nil.
Likewise, the 'owner' param is a NIB-specific concept. In short: you cannot use this method if populating your NSTableView with cells programmatically.
In this answer, I detail the Swift code to produce an NSTableCellView programmatically: https://stackoverflow.com/a/51736468/5951226
However, if you don't want all the features of an NSTableViewCell, note that you can return any NSView in tableView(_:viewFor:row:). So you could, as per the CocoaProgrammaticHowtoCollection, simply write:
let cell = NSTextField()
cell.identifier = "my_id" // Essential! Allows re-use of the instance.
// ... Set any properties you want on the NSTextField.
return cell
You should set the "Identifier" with "NameCell" in the NSTableCellView. And your codes should simplified as follow since the column's identifier won't change for ever:
func tableView(_ tableView: NSTableView, viewFor tableColumn: NSTableColumn?, row: Int) -> NSView? {
var result: NSTableCellView
let cell = tableView.make(withIdentifier: "NameCell", owner: self) as! NSTableCellView
cell.textField?.stringValue = self.data[row].setting!
return cell
}
references settings in XCode Interface Builder:
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 have hard time trying to collect the number of checkboxes checked inside the second column of a NStableView.
I composed a NSTableView with 2 column (via IB),
the first is named : BugColumn (it contains textfiled)
the second is named : CheckedColumn (it contains checkboxes)
Here is the code used to display strings in the first column :
var objets: NSMutableArray! = NSMutableArray()
...
extension MasterViewController: NSTableViewDataSource
{
func numberOfRowsInTableView(aTableView: NSTableView) -> Int
{
return self.objets.count
}
func tableView(tableView: NSTableView, viewForTableColumn tableColumn: NSTableColumn?, row: Int) -> NSView?
{
var cellView: NSTableCellView = tableView.makeViewWithIdentifier(tableColumn!.identifier, owner: self) as! NSTableCellView
if tableColumn!.identifier == "BugColumn"
{
cellView.textField!.stringValue = self.objets.objectAtIndex(row) as! String
}
return cellView
}
The second column is made of checkboxes appearing for each element of the first column.
I would like to know what is the corresponding text in the first column for each checkboxes enabled (checked).
I red a few exemples about NSTableView but, or they do differents things, or they are in Objective-C.
Could someone explain how to do that using swift?
Thanks