How can I connect a Button in a UITableViewCell with its action method in the UITableViewCell in xcode.
Crtl-Draging from the button to the source doesn´t work.
Create a subclass of UITableViewCell. Then you can hook up your button to an action in your sublass. Connect your button to your own subclass instead of the file's owner.
When dealing with custom cells, note that your "source" is now not the "Files Owner" but rather the "UITableViewCell" object. Hope this does the trick, if not - something is wired wrong in your code / XIB
Do it programmatically. It is the simplest believe me. Every tableViewCell has got a contentView. So all you do is for your specific row in section in -tableView:cellForRowAtIndexPath:
UIButton* cellButton= [UIButton buttonWithType:UIButtonTypeRoundedRect]; // Cane be custom as well
[cellButton addTarget:addTarget:self action:#selector(handleCellButton:) forControlEvents:UIControlEventTouchDown];
// Further changes such as text color whatever ...
[cell.contentView addSubView:cellButton];
//add a handler method for the button
-(void)handleCellButton:(id)sender{}
Related
I have created a TableView within the Storyboard. I don't want to control-drag links between this and files as programmatically, this is easier to maintain.
However, I don't know how I can determine what the identity of the TableView is within the Scene.
Is there a way of naming this, or somehow determining this sop that I can dynamically change the behaviour of it?
In fact, this sort of applies to everything in the Storyboard. I don't know how to name anything.
Use tag, under the View category:
Every view (control) has it. You can use viewWithTag method of UIView to get the control you need, like this:
UIButton *button = (UIButton *)[self.view viewWithTag:1]
If you look in your storyboard, when selecting a view controller there is a screen like this in the "Identity inspector" tab:
After assigning a storyboard ID to your view controller and activate the "Use Storyboard ID" option, you can instantiate it programatically with:
ViewController *vc = [self.storyboard instantiateViewControllerWithIdentifier:#"MyViewControllerID"];
[self presentViewController:vc animated:YES completion:nil];
I`m developing a app using Storyboards.
In one ViewController I have a button on navigationBar that links to the second ViewController. This transiction is defined in the storyboard (in this case I have defined a push segue to link the two ViewControllers)
I have changed the image of the button following this post in Stackoverflow.
But the problem is: That change in the View of the button breaks the push segue that I have defined in the storyboard. So the question is: How to still change the background of the BarButton without killing the segue action?
I dont want to programmatically reset the segue using performSegueWithIdentifier. This makes no sense since I already have defined it on the storyboard, so I think that must be another solution.
I think this is going to be your best solution:
In viewDidLoad:
self.navButton = [UIButton buttonWithType:UIButtonTypeCustom];
self.navButton.frame = CGRectMake(0, 0, 30, 30);
[self.navButton setImage:[UIImage imageNamed:#"yourImage"] forState:UIControlStateNormal];
[self.navButton addTarget:self action:#selector(yourNavButtonAction) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *logOutBarButton = [[UIBarButtonItem alloc] initWithCustomView:self.navButton];
[self.navigationItem setRightBarButtonItems:[NSArray arrayWithObject:navButton, nil]];
And in the method handling your navButton tap (yourNavButtonAction from above)
[self performSegueWithIdentifier:#"yourSegueIdentifier" sender:self];
**Note that this will require you to create a storyboard segue that originates from your ViewController itself, as opposed to a button on that ViewController. Control drag from your ViewController to the target ViewController, give the resulting segue an identifier (yourSegueIdentifier above) and you're set.
You cannot use the quoted code and use the segue at the same time. The code introduced a new object, a UIButton that gets the click, so your storyboard object will not get it any more.
You could try adding a standard custom UIButton in storyboard and change the code as follows:
// instead of
UIButton *someButton = [[UIButton alloc] initWithFrame:frameimg];
// use
_someButton.frame = frameimg;
Assuming that your _someButton is the name for the IBOutlet of the button from storyboard.
If this does not work, you should go with performSegueWithIdentifier. I do not see the problem with this, either. You anyway include a #selector with the custom UIButton. Just use it to initiate the segue. You can still configure the segue, etc., in the storyboard, so nothing is lost, right? In fact, the refactoring above seems like more work.
I have added a subview which contains a UIButton control. This subview is added to its superview programatically. I need to perform an action when this button is tapped, but since it's contained within its own subview, I can't hook an IBAction up to the view controller in order to push another view controller.
Is there an easy way to detect that the button is tapped and call a method within its super view?
You can do everything programmatically:
[buttonName addTarget:self action:#selector(methodName:) forControlEvents:UIControlEventTouchUpInside];
and then create your method:
- (void)methodName:(id)sender
{
// Do something.
}
This is all you have to code.
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).