I have a UIScrollView subclass with a certain subview I'd like to prevent from scrolling (while all the other subviews scroll as normal).
The closest example to this I can think of is UITableView's "index strip" on the right side (look in the Contacts app to see an example). I am guessing this is a subview of the table (scrollview) but it does not move as the user scrolls.
I can't seem to make my subview stay put! How can I accomplish this?
The trick is to adjust the frame of the "non-scrollable" subview inside -layoutSubviews.
Add the view that you want not to move as a sibling view of the scroll view on top of the scroll view instead of as a subview.
You can set it's property called userInteractionEnabled to NO
Related
I'm currently making a drawing application in Swift, but I wanted the page to be able to expand if the user wanted more room. I figured that I would use a UIScrollView to scroll around the canvas, but I wanted it to expand whenever the user went to the edge of the page, and for the UIImageView that I am drawing on to expand with it. Does anyone know how I would go about doing this?
Thanks!
In storyboard, drag a UIView into your UIScrollView then constrain that view to all sides of the scroll view. Then set the width to whichever value you would like (I would recommend to control drag from your view to the root view of the view controller and select equal widths), then give it a height constraint. Next, you need to connect an IBOutlet to your view controller code for the height constraint you set on the content view inside the scroll view. When you need to extend the page, add to the value of the height constraint and call layoutIfNeeded() on the scroll view.
I have a UIView with labels and textfields and I tested it in the simulator and noticed that I cannot scroll to see the rest of the view, how can I make the view into a UIScrollView and what do I need to do so I can make the view scrollable? I don't want to move labels and stuff or delete the UIView, is there a simple way?
Take a UIScrollView in Xib file outside your view. drag your view into this scrollview. The subviews inside your view remains same. and set the scrollview's contentSize
I have an interface which will have a text view and a table view below it. My current view looks like this
UIScrollView
UITextView
UITableView
Currently the TextView and TableView can scroll vertically..but what i want is the whole screen to scroll up/down. Why doesn't this work properly?
You can put a TableView inside a ScrollView, but you must resolve conflicts between touches, scrolling, and bouncing in IB or with code, and you must set the ScrollView's contentSize with code, not in IB.
If the TextView really "belongs" to the table, consider putting it in a table cell, or better, as a header, that's what they're for.
This is more of a check as I believe this is right but its a lot of work if I'm wrong.
I want to basically achieve fixed positioning with a scrollView. I want to have a list along the top that is always visible, scrolls horizontal only and then a scrollview beneath that to move around the information which scrolls both vertically and horizontally.
I figure I need to subclass UIScrollView and overwrite touchesBegan, touchesMoved and touchesEnded to send the touch to both UIScrollViews.
Is this right or off track?
Cheers
Overriding the touch events on a scroll view is probably not what you want to do. Instead you can simply use a single scroll view, and then in the parent view's -layoutSubviews or in the scroll view's delegate methods you can move the list so it's always at the same vertical position (use the scroll view's contentOffset property to determine where that should be). Both the delegate method and -layoutSubviews is called before the drawing actually occurs after the scroll view scrolls, so by always repositioning your view where you want it to be, it will appear to remain fixed to the user.
I'm having difficulty scrolling a UIScrollView instance in my UITableView when I set it as a tableHeaderView.
It still responds to touch events it appears, but doesn't wish to scroll horizontally. I've tried explicitly setting to setUserInteractionEnabled:YES without much luck.
Is there something in particular I need to do to get scrolling working when this is set as a tableHeaderView?
Thanks.
You probably need to check your scrollView.contentSize, ensure scrollView.contentSize.width > bound width.
This embeds a UIScrollView inside a UIScrollView (since UITableView is a UIScrollView). You probably want to set the tableview's canCancelContentTouches to NO so it doesn't cancel your UIScrollView's touches. That may create some problems if your UITableView needs to scroll vertically.
If that is your issue, subclass UITableView to overload touchesShouldCancelInContentView: so that this does not return YES for horizontal drags (or perhaps for touches in the header).