I have a UITableView, upon which I have placed an UIImageView, which scrolls vertically when the table is dragged, up or down depending on how it is dragged. (The image is separate and has not relation to what is present cells of the table view.)
UIScrollViewDelegate has been used for vertical scrolling.
Is there any way, the image can be moved along with the vertical scroll bar when the table is dragged? If so, how can this be achieved?
I think what you want to achieve is something similar to the scroller of Path.app.
Hava a look at this control: http://www.cocoacontrols.com/platforms/ios/controls/knpathtableviewcontroller
It's Open source and achieves this.
Related
I've created a UIViewController in a storyboard using autolayout and it has an embedded UITableView. For some reason there is white space above the table view section. My expectation is that the tableview would split all available space into cells and have cells starting right from the top.
What is causing the table view to add empty space above the first section when using auto layout and size classes?
(See screenshot below, the white space beneath "television" and above "Prototype cells" is the problem)
I've examined the constraints and insets, and cant see anything wrong with them:
UPDATE:
Here's the scene hierarchy
Try toggling the UIViewController property in Interface Builder named:
Adjust Scroll View Insets
If you drag a view into the table view it becomes the tableviews headerview that gives a space similar to what you see. Could this be the issue? Your posted layout looks correct.
Alternativley If you click on the Watch view controller in the hierarchy and switch in the simulated metrics section the top bar property from inferred to translucent navigation bar and back again this seems to move the cells down in the tableview when it is set to a translucent navigation bar
I have a section which is scrollable horizontally with paging and other sections normal with vertical scrolling enabled in UICollectionView.
Now the thing is UICollectionViewLayout has contentSize property which is defined for whole CollectionView.
But I want only 1 section horizontally scrollable in vertical scrollable collectionViewLayout.
I know I can use another collectionView in a section to do this.
But can I avoid that??
No, the only way to do what you are trying to achieve is to use nested views. One way to do it is to use custom cells in a vertically scrolling UICollectionView, each of these cells contains its own horizontally scrolling UICollectionView. Presumably all but one of those will not contain enough cells to warrant any horizontal scrolling in that "row" of your outer view.
Since the outer view is vertically scrolling, you could use a UITableView for it instead of a UICollectionView.
I have a view-based NSTableView which is embedded in an NSScrollView. It has custom cells that are x number of pixels high. The NSScrollView is the same size as the panel that it is a subview of. I want to resize the entire NSTableView depending on how many rows are in the table.
Everything is working except the resizing. Resizing the scroll view manually in IB seems to have the desired affect, but NSSrollView does not seem to have a class method to resize its view (like NSView has setFrame). Should I be resizing the scollview, the tableview, both, or something else? Does NSScrollView have a setFrame method or similar that I am missing?
Thanks.
Before you try to do it programmatically, make sure you have the outline view's autosizing masks set up properly in the nib file. It sounds like you simply want the outline view (and its scroll view) to always remain the same size as the window that it's inside.
By default, the autosizing masks of an NSScrollView/NSOutlineView combo that you place into a window looks like the following:
In other words, it's set up to always remain the same size as it is now, no matter how large you resize the window to be.
What you want to do is to change the autosizing masks to look like in the image below:
To do that, you click in the white autosizing box wherever there's a dotted red line to toggle it into a solid red line. Once it's configured that way, the scroll view (and table view) will always (automatically) be resized to be the same size as the window that it's in.
There may also be a way to achieve this using Lion's new "auto layout" feature, but I'll have to leave that to someone who has more experience with it.
In case you really need to do this (such as when you want all rows to fit in the scrollview alleviating the need to scroll) and the scroll view is only a portion of the window/view you can do:
[[myTableView enclosingScrollView] setFrame:newFrameRect];
scrollview.frame = CGRrectMake(x, y, w, h);
I'm trying to achieve an effect wherein as a tableview is scrolling, the currently visible cells will animate according to where they are positioned on the screen. I'm somewhat new to IOS dev, so let me try to break it down:
Tableview loads with custom cells User begins scrolling While the
table is in motion, the visible cells have a UIView in which I would
like to perform an animation that corresponds directly to the cell's
current Y position on the screen.
Cells will ONLY animate when they
are visible
Cell animation directly corresponds to table motion, i.e.
whenever the table view scrolls, the cells are animating; once the
table stops, the animations pause
One solution I have thought of is to update drawRect every single frame when the tableview is moving. Depending on the graphic operations, this could be horrible performance wise. Is there a way to grab the current table position every time it changes? Would I be better suited to use Core Animation?
This might be helpful if you want to achieve something like below:
https://github.com/mrugrajsinh/AnimatedTableViewCellDemo
Make your view controllers the delegate of the UITableView, and use all the methods of scrollview Delegate also. There you have many controls for start scrolling and end scrolling, and within thpse controls you could check for uitableview cell positioning.
You have to become delegate to this: https://developer.apple.com/library/ios/#DOCUMENTATION/UIKit/Reference/UITableViewDelegate_Protocol/Reference/Reference.html
and this is the method to override and animate your cells:
– tableView:willDisplayCell:forRowAtIndexPath:
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;