I have a two-days-brain-breaking-question to all of you:
I integrated a menu in my application by using a UICollectionView (one line, horizontal scrolling, fixed number of 9 items). Every cell has an own tag and uses an own prototype cell with own identifier. During the cellForItemAtIndexPath I assign a prototype cell to every cell (the prototype cell contains the specific UIButton in the storyboard). If you click a cell (respective the UIButton) a popover should open (this is working quite well, because the popover is anchored to the collection view not to the cell - otherwise Xcode will give an error, because of an outlet bind to repeating content.). Now to the questions:
Dependently from the chosen value in the popover, the name (titleLable.text) of the button should change. I think, an IBOutlet is needed, but not usable, because of the possible (but not happened) multiple (re)use of the cell.
Some other action in the APP could happened randomly, that changes the label of the button. Therefore an IBOutlet is needed too, I think.
I tried to give the prototypes a specific tag, but this (in my opinion) could not be used, because I cannot assign the tags to an UIButton, during loading, because not all of the cells are visible and therefore not reachable in viedDidAppear...
Any help is appreciated. This is a new try for an old problem and the collectionView till yesterday looked quite promising. Any ideas to help? Thanks a lot. I can´t give code, because 90% of the work are done in IB.
you can use NSNotificationCenter to send message from your UIPopoverController to a UICollectionViewCell.
Send and receive messages through NSNotificationCenter in Objective-C?
Just subclass UICollectionViewCell to MyCollectionViewCell and use your subclass in your UICollectionView.
At the -(void)initWithFrame:(CGRect)frame method of MyCollectionViewCell you should subscribe as an observer to NSNotificationCenter, and unsubscribe in dealloc.
Than all your cells may receive notification and react to it.
This is not an optimal way of receiving callbacks, but maybe the simplest.
Related
I am just thinking. Suppose, i have a tableview which have custom cell. It's simple. But My idea is that, when i click a tableview cell then another tableview is appear under that tableview cell, and again i click that cell then that sub tableview disappear. Similarly when i click second cell than work same. Is it possible? Please Provide me any idea or reference.
This is entirely possible, you're talking about Expandable cells.
My example here
The general idea is that your custom cell has a tableview at the bottom of the cell, and what you do is just change the cell height to display said tableview, on tap.
It's not easy, I'm not gonna lie it took us a while to do it, but we managed, and I'm telling you, it's very possible.
You can find a lot of help using the Expandable Cell keywords.
Note that you're gonna find yourself handling a lot :
What to do when the expanding cells is shown off screen?
What to do when you're expanding the first/last cells ?
What to do when expanding another cell ?
What to do when scrolling inside that cell (a scrollview inside a scrollview !)
There are many cases where it'll work, but won't work fine, and there is gonna be a lot of fine tuning. Specially in our case where we have rounded corners, but only when the cell is expanded, and not in cases where it's the last or first cell (next to section header).
They look cool and make you feel proud, but don't say to your PM it'll be done in a week, because it's a pain to build.
If you want to show additional cell information, you can add more cells after the cell indexpath you have clicked.
Create a custom table view cell classCustomTableViewCell by subclassingUITableViewCell class. And system will generate CustomTableViewCell.h, CustomTableViewCell.m, CustomTableViewCell.xib files for you.
Add protocols UITableViewDataSource and UITableViewDelegate in your CustomTableViewCell.h and implement the required methods in CustomTableViewCell.m files
Add a method for setting datasource and use the datasource for updating the table.
NOTE:
Handle table-dequeue mechanism properly, otherwise you will end up
with weird issues that may take time to investigate and resolve.
If you use this custom cell for all the cells in your parent table then the gestures will only listened by the child table. So plan for that too.
Please visit my blog for the sample code. https://myioslearnings.blogspot.in/2017/03/nested-table-view-in-ios-objective-c.html
Goal
I want to have a keyboard (custom) to show when I click on a cell in my tableview and have said keyboard edit a label in the selected cell.
What I have read and tried
Stack overflow and other searched threads/tutorials
A Swift example of Custom Views for Data Input (custom in-app keyboard)
How to make custom keyboard only for my app in Swift?
iOS 8: Creating a Custom Keyboard in Swift
Along with other results and searches (also the recommended readings within these threads), these were great for me getting the keyboard the way I want it (which is app-specific, I don't want to have the user install the keyboard to use the app), however, none explain how I could "activate" the keyboard without a textfield.
My thought process is this: I will have a keyboard with a textfield in place in order to receive the input from the keys pressed. This input would then be sent to the label that is in the selected cell. The problem is in the keyboard showing without anything to call it...
Why I don't want a textfield in the cell: Because I think it is more smart/elegant to have the tableview cell activate the keyboard. I have seen this in other apps and I can't figure out how it is done.
Any help on this matter is much appreciated. I am completely new to programming, am using Swift (so have no clue Obj-C or the like).
Thank you!
Well after a lot of discussions around other websites, it is a shame to say it but what I wanted was actually impossible (like stated by Duncan). For some reason I thought that in programming that word did not exist, but alas it is there. Well, the way that I did work around this limitation was as replied here in the comments as well as from the resource materials I already read:
I have 2 views:
tableView - this will have the list of items that I would like to edit a value. Has multiple labels where one of them would be edited by the user.
keyboardView - custom keyboard that would allow user input.
For the keyboard I used the delegate method as described in "A Swift example of Custom Views for Data Input". This worked perfectly and would send the data over to the tableView under the keyWasTapped function.
Next was the tableView. I had 3 labels in the custom cell, where one was called valueLabel. I had to add a textField to my storyboard hidden behind the tableview with which the user will interact and in the didselectrow I included the command to summon the keyboard:
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
textField.becomeFirstResponder()
}
From there I would grab the text from the textfield and update the UILabels in my custom cell. At least this way I can select a cell and not the textfield. So considering that the answer that would fit what I wanted is combination of the replies, I thought it would be best to say it here.
Thanks to Sandeep and Larme for their time.
TVDN,
Have a textField in cell not the label :) Create a custom cell create an IBOutlet to that class ffrom textField in cellForRowAtIndexPath
let tableCell = self.tableView.dequeueReusableCellWithIdentifier("cell") as! myCell
tableCell.yourTextField.resignFirstResponder()
and in didSelectRowAtIndexPath
let tableCell = self.tableView.cellForRowAtIndexPath(indexPath)
self.tableView.dequeueReusableCellWithIdentifier("cell") as! myCell
tableCell.yourTextField.becomeFirstResponder()
I'm sure this is a very noddy question, but I just can't get anything useful from the manuals.
I've a UITextField embedded in a custom UITableViewCell. If I use a delegate for the UITextView - it just gives me the UITextView.
If I link the event to the ParerentViewController, it just gives me the ID of the UITextView.
What I want to do is handle the event at the UITableViewCell level. Can I get the events from this text control to feed to the parent, and handle them at the parent level.
I don't seem to even be able to find the parent cell from the UITextField that the handler gives me. How do I find out which cell within the table the UITextField is in when I'm trying to process the events.
I have to be missing something obvious, as I've done this in earlier (pre storyboard) versions, and I'm sure it wasn't this difficult.
Answered a similar question the other day. See the accepted answer.
How can I get index path of cell on switch change event in section based table view
This will let you handle the text changes in the cell and pass them on to the table view. In your case its a UITextView and not a UISwitch.
Add properties to the cell for anything you will need inside the block code when it is called.
Create a subclass of UITableViewCell and implement the textField delegates inside the subclass. The code is lengthy but if you want I can post it when I get time.
I have a UITableViewCell that on touch, expands (dropdown). The user is then presented with a selection of options. When the user touches one of the options I want to briefly hide all the options, show an activity indicator spinning, display a confirmation message (on success) and then collapse the cell back to normal.
I'm having trouble hiding any object within the custom cell. The following simple code doesn't work (this is the correct superview corresponding to the cell):
var customCell: MyCustomCell = icon.superview.superview.superview as MyCustomCell
customCell.myLabel.hidden = false
I have tried hiding/showing a variety of different objects but nothing works. I've even popped it inside dispatch_async to ensure it runs on the main thread.
Additionally, Xcode 6 beta tells me that myLabel.hidden is read only. This also happens for other objects. Is this no longer the correct way to hide something?
I've had a search around but had no luck in finding an answer. If someone could help me out I'd be grateful! Thanks.
The usual way of doing something like this would be to implement the UITableViewDelegate method -tableView:didSelectRowAtIndexPath: to let you know when a row is tapped.
Then you can easily get and modify the cell
var customCell = self.tableView.cellForRowAtIndexPath(indexPath) as MyCustomCell
customCell.myLabel.hidden = false
I consider the line icon.superview.superview.superview to be a code smell. The multiple superview calls makes makes your code fragile and likely to break if you ever change the view hierarchy in your cell.
I'm getting the above error from storyboard when I dropped a UITapGestureRecognizer inside a UIView which is inside a UITableViewCell in my scene.
Any idea why I'm getting this error ?
I'm not sure why the restriction is in place but I know why you are getting it the error.
When you design a UITableViewCell in StoryBoard you are only designing a prototype object. i.e. the object may never actually exist. It only gets ACTUALLY created in tableView:cellForRowAtIndexPath:
What might be a better approach is to create the gestureRecognizer when you configure the cell in code. This way you won't have this restriction.
I'd also possibly look at whether you actually need it? If it is just for a single tap with one finger then you may be better off coding the touchesEnded or just using a UIButton instead.
Found the reason myself. storyboard only allows that when we have a UITableViewController or it's subclass and the tableview content should be 'static cells' instead of default 'Dynamic Prototypes'. In that configures I can add a gesture recognizer inside the cell subview.
But that is a limitation and will not work in my case as I have a very customized view controller subclass instead of table view controller subclass. Need to find other way around it seems :(