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.
Related
I have a big problem in my iphone/ipad ios7 app, I have a lot of controls based on UIView.
for example
list in my view controller I'm adding list based on UIView, this list contains some controls subviews based on UIView, and this controls have a lot subviews (particulary uibuttons) too. And now I want get UIControlEventTouchUpInside action im my viewcontroller, how I can do that ? I Do delegate im my uibutton control but im my view controller I dont't have instance this button, so I can't use
myButton.delegate = self;
I Have just instance my SuperView.
Someone could help me?
It will be better if you use custom view class for your UIView which is you used for containing your button and other controls. In that custom class you can simply set the action for your controls.
EDIT
You can use the following method in your UIButton's custom class:
- (void)awakeFromNib {
[super awakeFromNib];
[self addTarget:self
action:#selector(yourClickMethod:)
forControlEvents:UIControlEventTouchUpInside];
}
- (void)yourClickMethod:(UIButton *)infoButton {
// Button action goes here
}
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'd like to disable an UIButton in a UITableview in another ViewController:
I tried, inside the SecondViewController, but it only disable the _buttonDesc, buttonCell still is enabled:
buttonCell is the Button inside of UITableView.
buttonDesc is the Button Comprar, inside the SecondViewController.
.
-(IBAction)comprar
{
[_buttonDesc setTitleColor:[UIColor grayColor] forState:UIControlStateDisabled];
[_buttonDesc setEnabled:NO];
LivroCell *lvc = [[LivroCell alloc]init];
[lvc.buttonCell setEnabled:NO];
}
You need a reference to the actual buttonCell you want to disable. Creating a new instance of LivroCell will not help you.
The easiest way to do this is when someone clicks the "Buy" button, and you create the new UIViewController, pass a reference to the buy button (if "Buy" calls an IBAction then pass sender to the child view controller you create). So make a property on your child view controller to store the button, set that property when you do alloc/init, then it's easy to disable later.
I have a view controller that has a UIScrollView IBOutlet hooked up via storyboard. This view controller has a property that holds on to another view controller. I then add the view from this view controller into the UIScrollView as follows:
[scrollView addSubview:self.derpController.view];
Within derpController, I add a UITapGestureRecognizer as follows:
[self.view addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(singleFingerTap:)]];
Now, the problem that I run into is that the singleFingerTap: selector only gets called in the area within the starting area of the UIScrollView. That is, if I scroll the view and tap in a location that was not initially visible, the UITapGestureRecognizer is not triggered.
I can't seem to figure out how to solve this issue.
EDIT:
On the iPad implementation, the tap gesture is actually recognized a bit beyond the initial startup screen, but it does not cover the entire subview in scrollview.
I have a UITextField in my iOS app. When a user enters text and clicks Return, the keyboard goes away due to a call to an IBAction with "resignFirstResponder."
However, XCode does not let me drag a line from the UIView itself to File Owner. How do I associate touching the background of a UIView with an IBAction that makes the keyboard go away?
You can use UITapGestureRecognizer. see: Dismiss keyboard by touching background of UITableView
so instead of tableview, just add it to your view instead:
UITapGestureRecognizer *gestureRecognizer = [[[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(hideKeyboard)] autorelease];
gestureRecognizer.cancelsTouchesInView = NO; //so that action such as clear text field button can be pressed
[self.view addGestureRecognizer:gestureRecognizer];
and have a method to hide your keyboard
- (void) hideKeyboard {
[self.view endEditing:YES];
}
You've already noticed that you can't drag from the UIView to the file's owner to assoctiate an action with a touch.
The way to work around this is to change the class of the background view from UIView to UIControl and hook up an action from there to a method in your controller to stop editing.
That's because a UIControl can respond to touch events, and a UIView does not, but a UIControl subclasses UIView, and so it can be used in place of a UIView.
I wrote an example project a while ago that uses this technique. Have a look at the secondViewController's xib file and see how I've change the class of the background view and hooked it up to a an action in the controller to dismiss the keyboard.
Use the touchesBegan with Event and end editing on the view:
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
[self.view endEditing:YES];
}
One easy way to do it is to create a big transparent UIButton behind the view.