I have TableView with a custom TableViewCell loaded from an external nib file. Each cell has a UILabel that needs to be hidden each time the edit button is pressed in the parent Navigation Controller.
Is there a UITableViewDelegate or UITableViewDatasource protocol method that I can use that will let me change the alpha level or employ the setHidden property on each and every visible UILabel from each instance of the TableViewCell (e.g., for all indexPath.row)?
Thanks!
[tableView visibleCells] returns an array of all the cells that are visible at the moment. In your tableViewController's setEditing method you can use this to configure the existing cells.
You will also need to modify your cellForRowAtIndexPath method so that newly dequeued cells have the label set to visible / invisible as appropriate, depending on tableView.editing.
If your cell was a custom subclass you could override setEditing: animated: and make the changes there .
Related
I have a UICollectionView that is displayed by clicking a table cell within a navigation controller. So the UICollectionView is the second screen in the navigation controller's stack.
Cells showed up fine in the collection view when I registered a nib and created the cell via the UICollectionViewCell class. But once I try to create a subclass for the cell, the collection view just shows up as a black screen. My project can be found here.
Link to Project in Dropbox
To subclass the UICollectionViewCell, I did the following:
Created the .h and .m files for the subclass of UICollectionViewCell. Referenced this custom class on the nib's attribute inspector.
Registered the custom class with the cell's reuse identifier, within viewDidLoad of the view controller that displays the collection view.
[self.collectionView registerClass:[CustomCollectionViewCell class] forCellWithReuseIdentifier:#"cvCell"];
Created an instance of the custom cell in "collectionView: cellForItemAtIndexPath:"
CustomCollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:#"cvCell" forIndexPath:indexPath];
From what I've read, that should do it! But the collection view is showing up blank, can anyone help??
I checked your code. You have done perfectly. Collection view with cells is showing correctly, but you cannot see that since you are not setting any of the property of the cell. Just check by setting background color of the cell in cellForItem
cell.backgroundColor = [UIColor redColor];
If you are done everything in nib then you need to register nib instead of class. use registerNib instead of registerClass. If you are registering class you have to do everything programmatically.
I have a UITableViewCell which is currently cluttered and has too much information on the screen at once. I want to make a button, that when pushed, a small view will slide down and show the remaining information, and then when pushed again it will slide back to the original size. I was wondering how I go about doing something like this. I know NOTHING about doing this, so please be specific when pointing me in a certain direction. Thanks!
Do you want single Button for all cells in table view or you want to add button as subview on each cell
1.if you want to add button as subview on each cell
a) Add button with tag value equals to indexPath.row and set target to single method for each button.
ex
-(void)infoButonTapped:(UIButton *)sender;
Now on Click on button find the tag value of button and get the info from the array which you use to populate UITableViewCells.
b) Now create a infoview and add textview on it and set info as text prop of text view and add infoview as subview of view using UIView Animation and hide on next click
you can either use a bool variable in .h file to know hide or show infoView or you can check if infoview has superview then you have to hide infoview else add infoview as subview of self.view.
if you want a common button for all Cell
a) Now on click of button get indexPath for selected cell of tableview using tableview method
- (NSIndexPath *)indexPathForSelectedRow;
this method either return indexpath for selected cell or nil in case no cell selected
Use indexpath for get info from the array and add infoview as subview to view using step 1.b explained above.
you can also get the rect of selected row for setting the cordinate for the info view
by method of tableview
- (CGRect)rectForRowAtIndexPath:(NSIndexPath *)indexPath;
This may help you Show hide table
Or you can use BOOL as a property of cell and hide the subviews of UITableViewCell according to bool also resize frame of cell.
In this case, you better use the following method: -
(void)reloadRowsAtIndexPaths:(NSArray *)indexPaths withRowAnimation:(UITableViewRowAnimation)animation{
}
Make a call to above method in your UITableView didselectRowAtIndexPath method.
More explanation is given in below link
UITableViewCell expand and collapse
I have three UITableViewCell subclasses. I'm displaying these in a table view in a view controller. I have, in the view controller, returning nil for tableView:willSelectRowAtIndexPath: since I want the UITextFields, in two of my UITableViewCell subclasses, to get focus and become first responder.
For the third UITableViewCell subclass, I have a custom UIView subclass that houses a UIWebView. Currently the div in the html content loaded in the UIWebView is one line tall. I previously made the div height 100% but found that scrolling started to act up. If I tap in the div the keyboard comes up. However, if the user taps any where else within this custom UITableViewCell the UIWebView div is not selected and the keyboard does not come up.
How can I get either my custom UITableViewCell or custom UIView subclass to become the first responder? Or am I going about this the wrong way?
I believe you're going about this the wrong way. Returning nil for tableView:willSelectRowAtIndexPath: won't really help your cause here.
Instead, you have a couple options. First, you could make a UIButton that sits behind your text fields in your table cell which fills the entire view, and then respond to touches on it and tell the text field to become active. Like so:
Wire up the button within your UITableViewCell subclass:
[self.button addTarget:self action:#selector(handleTouch) forControlEvents:UIControlEventTouchUpInside];
Set focus on the text field when touched:
- (void)handleTouch
{
[self.textField becomeFirstResponder];
}
The other option, and the one I like less, is to handle the selection of the cell in the delegate methods and tell the cell's textfield to become active. Like so:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
MyCustomCellSubclass *cell = [tableView cellForRowAtIndexPath:indexPath];
[cell.textField becomeFirstResponder];
}
In which of course you would need to add a textField property to your MyCustomCellSubclass in order to do this.
Hope this helps!
I have not yet found any really good examples on how to do this. There is an image that I want to use as the accessory button and when I put it in and click on it doesn't work. So it looks correct but doesn't work...
Here is my code:
[cell setAccessoryType:UITableViewCellAccessoryDetailDisclosureButton];
cell.accessoryView = [[UIImageView alloc]
initWithImage:[UIImage imageNamed:#"TableView_Green_Disclosure.png"]];
So how do I get my UIImageView to call accessoryButtonTappedForRowWithIndexPath whenever it is tapped?
A thorough reading of accessoryView and accessoryType would reveal that they are mutually exclusive ways to customize a cell.
Setting the accessoryType will cause the table view delegate method to be called when it is tapped.
Setting the accessoryView will ignore the setting of accessoryType and give you something to display. If you want to receive a callback from the custom view you've put in place, it should be a control that is wired up to do so. (Or any view with a gesture recognizer.)
If you use a button, and set its action to accessoryTapped:, you will receive the button as the "sender" argument. You can walk up the view hierarchy until you find a table view cell, and then ask your table view what the indexPath of that cell is. This will then get you an index into your model objects and you be able to act on it appropriately.
Alternate to the button, you can enable interaction on the UIImageView above, and add a gesture recognizer to it.
To make the button actually do something, you'll need to implement - (void)tableView:(UITableView *)tableView accessoryButtonTappedForRowWithIndexPath:(NSIndexPath *)indexPath from UITableViewDelegate.
When an accessory button is tapped in a row, this method will be called and you'll have the chance to act appropriately using the passed in index path to determine which row's accessory was tapped.
Check the blog post hdr->cmdline for creating custom accessory view for UITableView.
The author used UIButton objects with images for custom accessory view.
To make use of the accessoryView - you would need to set the cell's accessoryType to UITableViewCellAccessoryNone deposit a UIButton (with associated image) into the cell and then wire it up to receive user touches. You might use something like the code below as the IBAction response to the cell's UIButton being touched:
- (IBAction) accessoryButtonPressed:(id) sender
{
NSUInteger pathInts[] = { 0,0 };
pathInts[1] = self.currentselectedrow; // ivar set when tableview row last selected
NSIndexPath* indexPath = [NSIndexPath indexPathWithIndexes:pathInts length:2];
[self tableView:mytableview accessoryButtonTappedForRowWithIndexPath:indexPath];
}
The UIButton would be wired to execute this glue code by way of a line inside your tableview's "cellForRowAtIndexPath:" function
[thecell setButtonTarget:self action:#selector(accessoryButtonPressed:)];
One thing I noticed is that the UIButton seems to want a 'swipe right' versus a simple 'tap' touch in order to trigger the event - but it could be my beta iOS that's the problem. Note that I had added a UIButton* object named 'cell_accessoryButton' to the Custom Cell source.
In the cell's source you'd support the 'setButtonTarget' call with code like this:
- (void) setButtonTarget:(MyViewController*)inTarget action:(SEL) inAction
{
[self.cell_accessoryButton addTarget: inTarget
action: (SEL) inAction
forControlEvents: UIControlEventTouchUpInside];
}
It's so much easier to just use the accessoryType reference and let iOS do the heavy lifting - but, if you want a custom graphic, etc - this is another path that works.
I'm having some class which is a subclass of UITableViewController.
on one of the TableView's cell I'm adding a view that holds a UIButton as subview
(i.e. [someParentView addsubview:button])
I'm adding the view to cell like this:
[cell.contentView addSubview:someParentView]
I've set the UserInteractionEnabled both for the button and for the view holding it ("someParentView") to YES
but still when I tap it, nothing seems to be happening.
any idea?
Thanks
What i want to accomplish in short: i want to make a tableview that shows some views.
each view contains some subviews, and in one of those cases there is a uibutton as a subview.
i want to have this button to trigger event by user's tap, as any other uibutton, so some method will be launched.
to do that, i made a class which subclasses UITableViewController, and for each cell i added a view using [cell.contentView someView], as i wrote. i disabled selection from all using the [self.tableview setAllowSelection:NO] and for each sell made selection style as NONE.
as said, i also set the view and the uibutton UserInteractionEnabled property to YES.
anything i'm missing?
Been solved!
I have used the method:
- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event
of UIView class in my subclass and returned the button as the returned object.
(of course, needed to test point if in button area).