I have a view controller with a scrollview with lots of text boxes, when i click on one of the text boxes and the keyboard appears, the content size of the scrollview isn't long enough to show everything with the keyboard open. How can i change the content size every time the keyboard pops up and set it back once it vanishes?
Also is there a method to make it vanish without resignfirstresponder on every textfield?
Hope someone can help me, I'm pretty new to Objective C.
contentSize probably isn't the property you should be changing.
Try changing the frame property of the scroll view (i.e. make it n pt smaller, where n is the height of the keyboard - 216 in portrait, 162 in landscape.)
The scroll view should deal with letting your content scroll correctly after you've changed it's frame.
The content size property is the size of the thing that is being scrolled - this doesn't change, it's just the amount that you can see that has changed.
(If you're feeling flash, you can animate the change in height of the frame :)
Related
I have an NSCollectionView with a vertical NSCollectionViewFlowLayout. I display rectangular icons in it.
I also have a slider in the UI, and when that changes, I adjust the minItemSize, which I then use in collectionView:itemForRepresentedObjectAtIndexPath: to create an equally sized NSImageView to the returned NSCollectionViewItem's imageView. Then I reload the view by invoking reloadData.
After that, the view shows the icons in the new size as intended.
The problem is, provided I have more data to show than fits into the current scoll view, that when the General System Preferences are set to Show scroll bars: When scrolling, the scrollbar disappears after reloading the collection view, and trying to scroll with the trackpad leads to a bounce that's telling me that the scroll view thinks that the content is just what's visible, nothing more to scroll.
But as soon as I resize the window, which also resizes the collection view inside, the scrollbars come back.
Curiously, if the System Prefs are set to Show scroll bars: Always, then the issue does not appear and the scrolling always works, and the scrollbars always remain visible.
I've tried a lot of things to trigger the re-calculation of the scroll view, such as invalidating the layout of the collection view's layout, the scroll view itself, its content view, and also tried to set their needsLayout to true. Nothing makes this work.
Update: The potential duplicate (NSCollectionView does not scroll items past initial visible rect), neither the collectionView.setFrameSize: nor the window.setFrame: suggestions work for my case (I tried adding these line before and after reloadData).
Even if I force a resize of the window like this, it doesn't bring the scrollbars back, only a manual dragging of the window edges does:
[self.collectionView.window setFrame:NSInsetRect(self.view.window.frame, 1, 1) display:YES];
Also note that in my case, initially the scrolling works, just not after resizing and reloading.
Another finding: When I call selectItemsAtIndexPaths:scrollPosition: after reloadData, then the scrollbar comes back. But only if I pass a non-empty NSSet for the paths. And since I may not have selected any items, this isn't a permanent solution.
If no other ideas come up, I'll try to make a demo project.
I've solved it:
I had to delay the call to reloadData, e.g. by calling it from within the block code of dispatch_async(dispatch_get_main_queue(), ^{ ... });
Before the fix, I did call reloadData right from the setSliderValue: handler, which is bound to the slider's value. It appears that this didn't go well together.
I making an ipad application with screen split in half. Each side contains a container and each container holds UIView.
In the left uiView i have a uiScrollView with multiple elements (customs uiview) inside, like a grid but with scroll, and each element support tap gesture.
When i tap each element they work fine and behave like they are suppose to. lets say they do a NSLog(#"tapped!").
Problem comes when i resize either the entire view that holds the scroll view or the Container like so:
navigationVC.view.frame = CGRectMake(0,0, 338,768);
The tap stops working! But if i resize back to its original frame, tap starts working again.
navigationVC.view.frame = CGRectMake(0,0, originalWidth ,768);
I thought the problem would be the elements re-arrange when i resize the scroll view, but in fact its not.
The frame is being resized when i swipe the entire application either left or right.
EDIT:
Behaviour diagram: http://i.imgur.com/4vKpHLQ.png?1
EDIT2: didnt figure it out yet, but i see now that element bound's are changing when the frame is resized.
Got it!
Problem was that when i resized the scrollView the elements.Bounds where changing too. Then i went digging why... could only be something like a anchor... i then started to change a few properties on my XIB.
Under "Simulated Metrics", changed the "Size" drop-down from "Freeform" (add 150, 45) to "Inferred".
Forced the size on initWithCoder, compiled, and it worked.
Thanks Burhanuddin Sunelwala for trying to debug this with me.
I have a scrollview that I want to have disappear as it scrolls across a certain point on the screen. So as you scroll, the elements on the scrollview will disappear instead of covering up the elements behind it. But if you scroll back down, it reappears. How can I set a point on the screen that will hide the scrollview once it hits that point? I would like to accomplish this without having it "hide" behind another object. Thanks.
Almost forgot, it's all code, no IB used.
You could set the scrollView's clipsToBounds property to true?
Or, if that's not what you're trying to do, you'll need to intercept the scrollViewDidScroll: method and use the contentOffset of the scrollView to determine a threshold at which to make it (or its contents) disappear.
It's late in the day, these things happen. All I had to do was set the scrollview to proper size and location on the screen and it works great. Setting the ScrollView to the proper x and y and width and height fixed the issue. The upper edge makes the elements disappear when they pass the edge. Thanks again for the help, I'm going to figure out the contentOffset as I'm sure it will be needed one day.
I am trying to initiate a scroll view in my UITextView and even though I seem to have selected the appropriate boxes, I can't seem to get the scrolling working. I have gone through multiple questions similar to this but none seem to have the answer.
I included an image of Xcode below:
Question 2: When I scroll down the majority of my text shows but the scrolling stops with two sentences or so left and I have to scroll down and hold it there to read. Any way I can fix this so it scrolls all the way to the bottom of the text?
Can you check the two boxes: Bounce Horizontally and Bounce Vertically and see what's happening? Sometimes your content are actually way bigger than your view, and they are touching a invisible outer box. If you can see they actually move, that means there is nothing wrong with touch or scroll, is just the view layout problem.
For the content issue, my guess is that the content size is not right, you can programmatically adjust it with textView.frame property, set it to a proper size, such as the frame of the window or the frame of the content, which are CGRect classes. Comment below to see if this can solve your second problem.
The text view will not scroll in storyboard, only the app. And the text view will scroll once the content in the text view exceeds the frame size.
If you're using iOS 7+, you can just turn on auto layout, pin each of the sides of the text view to the edge of its parent view, and it works fine without needing to do anything in code.
I have a UITableView which is composed of custom cells. There are 21 cells containing text fields.
When I try to scroll and edit the cells at the bottom of the UITableView, I can't manage to get my cells properly positioned above the keyboard.
Also i created a custom cell class separately for my cells. So keyboard delegates are available on that class only.
I have seen many answers talking about changing view sizes,etc... but none of them has worked nicely so far.
Could anybody clarify the "right" way to do this with a concrete code example?
There are three approaches to this problem all of which tie into the keyboard did / will show notification....
When the keyboard appears, you move the whole view (including tableview) up to ensure the selected textfield is shown on screen, you can calculate this by getting the keyboard height (from the notification) and the textfield position.
You can resize the tableview so that it is only as big as the portion of the screen not covered by the keyboard, again get the height from the notification.
You can set the content inset for the tableview (for the bottom value) to the height of the keyboard.
If you need to, when resizing or repositioning the tableview, you may need to set it to scroll the content to the rect of the text field to ensure it is in view...
- (void)scrollToRowAtIndexPath:(NSIndexPath *)indexPath atScrollPosition:(UITableViewScrollPosition)scrollPosition animated:(BOOL)animated;