I have set the left back button item of a navigation controller to a custom view and have set up a tap gesture recognizer for it, now when the custom view receives a tap gesture it pops the current view controllers vie of a stack of navigation controllers.
I want to now switch the view when the back button is tapped, and still maintain the functionality similar to a button, like I long press it and it will only pop the current view controller once I have let go.
You can add a UILongPressGestureRecognizer to your custom view in addition to the tap recognizer.
Note that UILongPressGestureRecognizer is a continuous recognizer: one long-press will generate several action messages. You need to check for state UIGestureRecognizerStateEnded in your handler.
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At the bottom of the Detail View Controller of a Split View Controller, I have added a Toolbar in the Storyboard. I have added three Bar Button Items in this Toolbar. Each Bar Button Item is hooked to its IBOutlet in the private interface of the Details View Controller, and also hooked to its IBAction implementation in the same controller, for example:- (IBAction)shouldPresentView:(UIBarButtonItem *)sender
The main view contains:
A Webview.
A small rectancgle view at the bottom of the screen, below the webview, created and added programmatically, and containing various buttons. All the buttons stay operational.
When touching any of the Bar Button Items, the button is temporary highlighted, but none of the IBAction methods is triggered (a NSLog() statement in every method is never executed).
After searching and reading equivalent topics, I went through several solutions:
I added manually the Details View Controller as the delegate of the Toolbar in the View Did Load method of the Details View Controller.
I emptied the cache of the Derived Data of the Product.
I checked that every IBOutlet has an address and is not nil.
I tried to add an action SEL manually in the View Did Load method for every Bar Button Item.
I removed the rectangle bottom view to be sure that it was not interfering with the responder chain.
I added a Bar Button Item in the Navigation Bar to check if the same problem occurs: no, the Bar Button Item fires the IBAction method.
Any help would be appreciated.
Developing with iOS 7 SDK in Xcode 5.0.2
The issue was coming from a Tap Gesture that I added to the main view to collect touches on the web view. So the touch on the Bar Button Items was probably captured somewhere by the main view before reaching the UIButtonBarItem. I changed the target of the Tap Gesture to the web view – more logical – and the issue has been solved.
How can I make a button or any view which should be visible in all the view controllers and its action can be called from all the view controllers? Popping and pushing of viewcontrollers should take place behind that button. I don't have any code but I have a reference app, Moise Bently, in this app it has a button on top right corner.
Try adding _yourView/button to your window... you can do this in didFinishLaunchingWithOptions also you can do [self.window bringSubviewToFront:_yourView] when required.. if you add some other view over it.
I'm trying to recreate the Facebook slideout menu trick (yes I know there's lots of libraries already).
When a user touches a button on the screen, a new view controller is switched in and a rendered bitmap of the previous screen is shown in the foreground of this new view. The uiimageview has a pan gesture recogniser attached to it to allow it to be moved around on the screen.
Currently it's requiring two touches to activate the gesture recogniser, once to bring in the new view controller, and once for the pan gesture to move the uiimageview.
My question is, on touch down can I bring in the new view controller and then pass the touch events to the uiimageview? Or is there any other trick that will help?
I haven't managed to achieve this exactly, but instead I've subclassed UIViewController so the root view controller never changes, just the content that's being displayed.
I would like to create a button in my UIView that when touched spawns another button under the finger which immediately starts to follow the finger.
I have seen a tutorial here that deals with button following finger, but i can not figure out how to make this button follow finger WITHOUT user tapping it after creation.
Using iOS 5.1 SDK with XCode 4.3.2
Any help?
You can add target/action pairs to a button for various control events: to make something immediately start following your finger, you probably want UIControlEventTouchDown.
Hook up your first button to call a method on your view controller for that control state. In that action method, create your new button, and shove it in a property on your view controller so that you can refer to it later. Also set a BOOL property on your view controller that's called something like shouldTrackButton.
To make the new button follow your finger, I guess the easiest way is a pan gesture recogniser on the superview. Set that up to call a method on your view controller. In that method, if the gesture recogniser's state is UIGestureRecognizerStateChanged, call translationInView: on the gesture recogniser, passing in the view controller's view (i.e. the superview of the buttons). Now, if and only if shouldTrackButton is YES, take the frame of the original button, translate it by that amount (using CGRectApplyAffineTransform and CGAffineTransformMakeTranslation), and set the new button's frame to the result.
Finally, in the same method, if the gesture recogniser's state is UIGestureRecognizerStateEnded, set shouldTrackButton to NO.
I have a View Controller where I select some data into an array and then optionally on clicking of a button I show that data in a TableView added as a subview to previous view with a flip animation.
Now I have the facility to delete data from array I have picked from first view and passed to this one.
Now I have a condition that there is a button on the righthand side on the navigationBar on whose controller the previous view was pushed.
Now that button needs to be disabled until there r atleast X number of elements in the array.
so while I am adding data In my previous view, I keep check on the array and as soon it crosses the required count , I enable the button.
Now in the other view which is a TableView which has been brought in with animation,
Whenever I delete data I need to disable the button again when it goes below the number X.
How can I access the navigationBar's button in this subview's controller ?
shall I set the first view Controller as delegate in the next one ?
If your viewController is inside UINavigationViewController, you can set navigationBar buttons with self.navigationItem.leftBarButtonItem and self.navigationItem.rightBarButtonItem.
try using superView proprty or loop through all the pushed ViewController and check if it is previous VC. Then make the button enabled or disabled
My opinion is you can create a uinavigationController object in your subview and assign it from your parent view(Where you have the navigation controller object). You can then access the navigation controller in the subview.