Is there any way to make UIScrollview circular based on auto timer. I have some banner on home page which need to display automatic scroll.
I have added NSThread timer but when uiscroll view comes from last to first rect, it display inconsistency, which look like jump. I want to make it smooth scroll.
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I'd like to have an interactive animation where a view transitions from one set of constraints to another as the user drags up/down the screen. The background image should shrink vertically (easy), and the profile image should change from being horizontally and vertically aligned to the background image to being anchored to the top and left corners of the background image. Is this possible?
Yes, it is possible, and you can see this effect in the Avvo app, for example (in the lawyer profile screen). The trick here is to smoothly transition from one set of constraints to another.
Here's an outline of how to do this:
add a UIScrollView. Add the view you want to animate as a subview to the scroll view.
Make your view controller implement
UIScrollViewDelegate
In the delegate method
scrollViewDidScroll(_:), update the constraints' constants as
needed.
Also in that method, when contentOffset crosses a
threshold value, flip to a different set of constraints, by setting
their active property to true or false.
To keep the view (the headshot image, in my example), pinned to the top as you scroll, just continuously update its top spacing constraints based on the contentOffset.y value.
Achieving a perfectly smooth transition may take some trial and error, but it definitely can be done!
Here are the screenshots showing the transition as you scroll up:
How to change UITableView's scroll indicator's color? I just need to set it's color. Don't propose change it's style to black or white.
There is not a public API for doing that. Any recommendation that would be given would be likely to be broken when Apple makes changes to the underlying structure of the scroll view.
That does not, however, preclude you from creating your own scroll indicator from scratch. I needed to do this in a particular use case where a scroll indicator needed to be visible at all times, not just when the user was touching the scroll view.
You can have your custom scroll indicator view and position it where it needs to be based upon the content offset of the scroll view and its scroll indicator insets. Adding a handler in scrollViewDidScroll: would then allow you to correctly position it and take advantage of any inertia that the scroll view has.
You can even contract the size of the scroll indicator view based on how far the user has scrolled beyond the content size of the scroll view, to give the same effect of bouncing that Apple's implementation has.
I want to implement a scroll view which looks like the stock ticker. It can respond slide or tap gesture.
How can I implement this? Please advise me. Thank you!
Use a NSTimer to reposition the contentOffset of your Scrollview.
Use the UIScrollViewDelegate to stop your animation while the user is dragging the scrollview.
Conceptually I'd setup an container UIScrollView with the contents of the scrolling area as subviews. To simulate a circular scroll I'd keep an array of the subviews. I'd add a view just off screen at the starting edge, and take away a view just off screen at ending edge.
UIScrollViewDelegate methods will be called when a person starts or stops dragging the view, which you can use to start and stop the animated scrolling. Other methods in this protocol can be used to reset the contents of the scrollview when the edge is reached, so more views can be added as needed.
I'd probably use a CADisplayLink to manually manage the animations. The method given to the CADisplayLink would update the scroll and manage adding and subtracting views to the edges. It would also stop scrolling based on a flag set by the UIScrollViewDelegate methods when the person is dragging the scroll.
Unless you jailbreak, you can't put custom views in Notification Centre.
I hope you can help me...
I have a scrollview (UIScrollview) that contains a contentView (UiView).
Inside the contentview I have a Horizontal slider. My problem is that if the user swipes just next to the slider, trying to hit the slider, the scrollview scrolls. I would like to enlarge the area of the slider if possible, or just disable scrolling for a certain part of the scroll view.
Is this possible, and if yes, how?
Thanks...
You need to look at the following properties for customizing the look of a scroll view:
indicatorStyle
scrollIndicatorInsets
Or if this isn't to your taste: You could subclass UIScrollView and when the custom slider receives touches, read them in transform them and call setContentOffset on the UIScrollView. In my opinion that seems like a big task for very little reward and I'd just stick with the default behaviour/look.
I have a scrollview that has a number of custom imageviews in it. I use the custom imageviews as I need to be able to drag any one of them off the scrollview and to another location on the iPad screen, bit like a photo picker.
Problem is if I want to scroll the scroll view most of the time the custom imageview gets the touch and moves rather than the desired scroll?
I notice in the sample code from Apple using the autoscroll example that they have the same issue but they have left a large gap between the images....ugly!
Is there a way to let the app know when you want the touch to be a scroll and when to be a drag?
Thanks
You could make a drag require holding for 1 second, similar to the behavior of the home screen when in editing mode: if you want to scroll, you just flick; if you want to drag, hold down for a moment until the icon enlarges, then you can move it.