I have UITextView in my iPad app and I need to move it to top, when keyboard appears
. Can you help me how to do it? Thanks
An extract from here :Apple documentation
Moving Content That Is Located Under the Keyboard When asked to
display the keyboard, the system slides it in from the bottom of the
screen and positions it over your application’s content. Because it is
placed on top of your content, it is possible for the keyboard to be
placed on top of the text object that the user wanted to edit. When
this happens, you must adjust your content so that the target object
remains visible.
Adjusting your content typically involves temporarily resizing one or
more views and positioning them so that the text object remains
visible. The simplest way to manage text objects with the keyboard is
to embed them inside a UIScrollView object (or one of its subclasses
like UITableView). When the keyboard is displayed, all you have to do
is reset the content area of the scroll view and scroll the desired
text object into position. Thus, in response to a
UIKeyboardDidShowNotification, your handler method would do the
following:
Get the size of the keyboard. Adjust the bottom content inset of your
scroll view by the keyboard height. Scroll the target text field into
view.
Related
I have a view where content is supposed to scroll over a few elements. One of which is a button. What I did is place the button and all background elements, and then created a scrollview on top of that.
However, the touch events now (obviously) go to the scrollview, and not to the elements in the back. Is it possible to enable interaction through the empty parts of a scroll view?
Screenshot here:
There is a scrollview on top of e.g. the "next" and "edit" buttons. but I'd like these to be clickable anyways.
Thanks.
I'm going to assume that the content you want to scroll is in a subview. ScrollViews always serve as the first layer of any scrollable UI. Put scrollview in your subview then UIView over your ScrollView and over that add your elements.
How can I ensure that a UITextField stays on screen despite not currently viewing the bottom of a UITableView? Like when I scroll up, how can it stay on-screen rather than disappear at the bottom of the screen. I want it anchored to the bottom of the screen at all times.
Edit: It does not appear when I add it as a subview.
2ndEdit: Stop docking post please..
You can add it to view that contains tableView i.e tableView superView.if your viewController has tableView.You can do like
self.view.addSubView(yourTextFied)
self.view.bringSubviewToFront(yourTextFied)
and set the frame of yourTextField approprately
I have a UIScrollView designed with IB.
UIView
UIScrollView
UIView
UITextField
UIButton
...
If I tap on the text field the view scrolls away towards the upper left corner of the screen before the keyboard is appearing. The space above the keyboards remains empty. I can scroll back the view if I drag in this empty space.
I have googled around, but found only postings where users want to scroll UIScrollView. I want the view to stay where it is.
Thanks in advance for any suggestions.
Here's what happened.
You designed the whole thing in Interface Builder.
The scroll view was not scrolling, so you set its contentSize in code to the size of the scroll view's primary subview (what I like to call the content view).
The scroll view was still not scrolling, so you munged the content insets - and this caused the problem that brought you here.
Your mistake was (3). Instead, you should have thought more about (2), i.e., why isn't my scroll view scrolling even though I have given it a nice big content size?
The answer is that, in a storyboard or xib that has auto layout turned on, that's not what you do. What you do is use constraints from the content view to its superview (the scroll view), on all four sides. Set the constant for all four constraints to zero. This causes the content size to match the size of the content view, automatically.
UIScroll view lets me declared a scrollable area when I have too much content for one page. Strangely, the scroll view in question behaves as desired in the X-axis, with no scrolling whatsoever allowed. Unfortunately, the Y axis -- where scrolling is necessary -- doesn't 'clip' the allowed scroll area to the content size. The user can scroll outside of the content size, and only after they let go does scroll view 'bounce' back to the allowed zone.
I want to prevent the user from scrolling further up than there is content to view (down doesn't bother me) because it looks 'wrong' to have the header at the top of the scroll view pull down, leaving the regular background behind it.
If you are making your UIScrollView in interface this is as simple as deselecting the
"Bounces, Bounces Horizontally, and Bounces Vertically"
check boxes in your scrollView's attributes. If you are designing the UIScrollView in code you can add this.
self.textView.alwaysBounceHorizontal = NO;
self.textView.alwaysBounceVertical = NO;
self.textView.bounces = NO;
As it is set up now, I have two UITextViews inside of a UIScrollView. The point of this is that the UITextViews themselves don't scroll, they just get larger (their contentsize) as more text is added. The UIScrollView handles all of the scrolling up and down of the view regardless of how much text there is (think similar to Mail.app where the subject view is above the message view, etc). That said, I've ran into a problem now. When I programmatically add text to my UITextView (in this code, bodyText), the UIScrollView automatically scrolls to the bottom for some reason.
To add the text I just do:
NSRange selectedRange = [bodyText selectedRange];
NSString *selectedText = [bodyText.text substringWithRange:selectedRange];
bodyText.text = [bodyText.text stringByReplacingCharactersInRange:selectedRange withString:[NSString stringWithFormat:#"<b>%#</b>", selectedText]];
So, for instance, if I had 2000 pixels vertically of text and was currently scrolled to position 400 and then added text somewhere around there, the UIScrollView would then go all the way down to 2000.
I've tried to stop it via subclassing UISCrollView and overriding -setContentOffset, but that freezes all scrolling then.
My question is, why does it scroll all the way to the bottom in the first place? The text is added when the user clicks a button somewhere else on the screen, and the scrolling has nothing to do with any finger drags or anything.
In Scroll View Programming Guide you get:
Making a rectangle visible
It is also possible to scroll a
rectangular area so that it is
visible. This is especially useful
when an application needs to display a
control that is currently outside the
visible area into the visible view.
The scrollRectToVisible:animated:
method scrolls the specified rectangle
so that it is just visible inside the
scroll view. If the animated parameter
is YES, the rectangle is scrolled into
view at a constant pace. As with
setContentOffset:animated:, if
animation is disabled, the delegate is
sent a single scrollViewDidScroll:
message. If animation is enabled, the
delegate is sent a series of
scrollViewDidScroll: messages as
animation progresses. In the case of
scrollRectToVisible:animated: the
scroll view’s tracking and dragging
properties are also NO.
If animation is enabled for
scrollRectToVisible:animated:, the
delegate receives a
scrollViewDidEndScrollingAnimation:
message, providing notification that
the scroll view has arrived at the
specified location and animation is
complete.
So maybe you can use this functionality to lock the visibility on your UITextView.