I have a problem. There are 2 views on my screen UITableView and UIScrollView. I need to handle Drag&Drop functions for each of them. In ScrollView I have StackView with many elements. It's easy for example, to do it with TableView but there no ways to connect Drop delegate to ScrollView. Also there are no ways to conform UIScrollView to Drop Delegate. Has somebody decided this problem before?
I tried to handle TapGesture recognizer with dynamic change to Drop Gesture. But it was so difficult because of animations.
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In Swift, is there a way to change scrollview focus programatically? For example, in one of my scrollviews when a user is scrolling, after the scroll has gone past a certain distance I want the scroll to stop scrolling and to immediately scroll a tableview instead. I want this to all happen in the same motion/swipe, so I need to automatically shift the focus from the scrollview to the tableview using code. Is this possible?
Using Rikh's comment, I was able to solve this using a UITableView with multiple sections and custom UITableView headers. I can use the viewForHeaderInSection method to create a custom floating header which is exactly what I need and it scrolls much more smoothly.
I've been trying to programmatically create a UITableView inside of a UIScrollView and I'm having some trouble. Basically I want to have the cells to register as "checked" when they are tapped on. I don't need the UITableView itself to scroll because the UIScrollView will be large enough that this isn't necessary, but I still need the UIScrollView to be able to scroll when the user drags over the UITableView. I'm just overall confused about how gesture recognition works with regard to this project. I can't get the didSelectRowAtIndexPath method to be called, although I can get the didHighlightRowAt method to work. I saw a suggestion to add a UIScrollView onto each cell, but this didn't seem to help. Any guidance is appreciated as I'm unsure how exactly to go about this.
Thanks!
Sounds to me like you should be using custom UIButtons rather than UITableViewCells to allow for selectable content within your UIScrollView.
I have a UITableView in my view controller, and inside the cell there's a horizontal UIScrollView and inside this scroll view, I created many instances of a custom UIView (loaded from NIB file)
UITableViewCell
-- UIScrollView
-- MyView: UIView
Now MyView is not detecting touches, userInteractionEnabled is set to YES on every view in the hierarchy and I tried both ways
Implement touchesEnded: in MyView
Add a UITapGestureRecognizer to it
Both ways don't work, I guess it's something related to the fact that I have a UIScrollView inside the UITableViewCell
I am writing the application in Swift, not Objective-C, I don't think it matters since I guess it's a UIKit issue but who knows.
If you have any hint, I am all ears.
Thank you
Alternative for this case is add UITableViewCustomCell and add UICollectionView with horizontal scroll in Custom cell . It is more optimized way than adding UIView in scroll view because you can greatly speed things up. Instead of instantiating a lot of cells, you just instantiate as many as needed, i.e. as many that are visible (this is handled automatically). If scrolling to an area in the list where there are "cells" that haven't got their visual representation yet, instead of instantiating new ones, you reuse already existing ones.
Consider the view hierarchy in the figure below:
OverlayView is simply a control view that has some custom controls on it. It also has multiple tap/swipe gesture recognizers. The ScrollView is the scroll view that needs to be scrolled based on the interactions with OverlayView. The OverlayView has the same frame as that of the ScrollView.
I need a way to add some kind of swipe/pan gesture setup configured for the OverlayView such that I can scroll the underlying ScrollView as if I am interacting with it.
There seems to be two different approaches:
Recognize the gesture on the OverlayView and pass it to ScrollView. But I am unsure what gestures to use and how to make ScrollView interact with them.
Ignore all the touches on the OverlayView unless they are on the controls. Pass these touches to the underlying ScrollView. This seems like the easier approach; but I am not sure how to proceed with this either.
Does anybody have any kind of sample code for some project or a similar exercise they worked on before? If not, any pointers whatsoever?
Option 2 is what I was going to recommend. There is a method you can override called hitTest:withEvent: on UIView.
You return a view from it. So if the touch needs to go through to the scroll view then return the scroll view. Else return self.
In my app I have a UIScrollView and I need to swipe left and right from one picture to the next, but I also need to recognize a scroll.
How do I differentiate between a scroll and a swipe with UIScrollView?
I believe you're actually looking for is an implementation of UIScrollView with Paging, as you do not need to handle the touch events yourself, or determine if they are scrolls or swipes.
The Apple Documentation on Scroll Views and Paging Mode should help you get started
Look into the UIScrollView Delegate Methods. ScrollView can detect different types of actions drag etc or add swipeGesture directly to the scroll view
StackOverflow has questions already on this
iOS: UIScrollView detecting Swipe Gesture
Setting up UIScrollView to swipe between 3 view controllers
How to recognize swipe gesture in UIScrollView