Is there any event in table view which will get triggered when i try to scroll the table view.
I want to create a down arrow image to the bottom of the table view ,when the user tries to scroll through the table view.Any help will be appreciated.
Thanks,
Christy
As far as i recall, since UITableView Inherits from UIScroll view you can listen to the UIScrollViewDelegate methods:
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
}
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView
willDecelerate:(BOOL)decelerate
{
}
Any way. make sure that
tableView.delegate=self;
Related
I have a custom uiscrollview inside each table cell. It works great except one condition. When you scroll the scrollview and it do autoscroll/decelerate. At same time if you scroll table view quickly up and down it also moves the scrollview in the table cell which will result in scrollViewDidScroll getting called for scrollview and messed up with my logic.
You need to check which UIScrollView is actually scrolling:
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
if (scrollView == yourScrollView)
{
// Do something
}
else
{
// Do something amazing
}
}
Maybe I made a wrong description for what I want and hence haven't hit any answer, if that's the case please kindly provide a link with solution.
what I want is:
I have scrollview, alwaysBounceVertical is set to true. So when the user drags down after the scrollview has already reached top, the scrollview should bounce. More specific: the view moves down as the user drags, and the moment the user releases his finger the scrollview bounces back.
The event I want to catch is the one that the scrollview finishes bouncing back. I want to apply an animation after this point. So could anyone tell me how should I modify which method in UIScrollViewDelegate to catch that event?
you can just use UIscrollView Delegate methods Apple Documentation and this an example
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate {
if(!decelerate){
// Do something
}
}
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
// Do something
}
for your problem you can apply your behaviour on scrollViewDidEndDragging
i think this methods will help you
- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset NS_AVAILABLE_IOS(5_0);
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate;
I'm new to iOS programming and i want to learn something about UITableView.
I have some images in UITableViewCell. I want to hide my images when scrolling start then i want to show them when scrolling stop.
How can i do that ?
Is there a method or something else about that ?
UITableView inherits from UIScrollView, thus you can in your tableView delegate receive
UIScrollViewDelegate callbacks.
Implement the delegate method
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
which tells the delegate when the scroll view is about to start scrolling the content.
and
- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset
which tells the delegate when the user finishes scrolling the content.
Read the ScrollViewDelegate Reference.
It is not a big deal you simply need to implement scrollview delegated methodes to know when scrolling stops ,Then set a bool value and reload the table and on basis of bool value you can show and hide the images.When scrolling starts set bool to NO.
I have a UITextField at the top of my Table View, after the text field is selected I want the keyboard to disappear. I know to call [[self view] endEditing:YES]; but I don't know how to check for the scroll. A good example of this is IMessage, when the keyboard is in view you can scroll up to collapse it, I want my table view to work inversely.
UITableView is a subclass of UIScrollView. By being the table delegate (implementing <UITableViewDelegate>) you are also the scroll view delegate (<UIScrollViewDelegate>) and as such you can implement:
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
Then you will receive a notification whenever the table view is scrolled. You can then also use scrollView.contentOffset to check where the table has scrolled to (which direction it's scrolling in).
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
[textField resignFirstResponder];
}
Try other method in UIScrollViewDelegate if you need other behaviour.
Call resignFirstResponder where appropriate.
It seems you use UITextField in your cells. Use UITextFieldDelegate protocol to know when UITextField ends being edited:
-(void)textFieldDidEndEditing:(UITextField*)textField
{
[textField resignFirstResponder];
}
I've got a re-orderable table view (UITableView instance). Although I've implemented the UITableViewDataSource method:
tableView:moveRowAtIndexPath:toIndexPath:
This only fires on drop of the moved table cell.
I want a callback that tells me that a cell has just been gripped by it's reordering control and is about to take flight. I didn't catch this in the API.
Purpose: As soon as a move operation is even being flirted with, I'd like to remove other decorations on my main view that are no longer valid. Ideally, I'm looking for something like a call back (I can wish right!) that read like this:
tableView:didBeginPossibleMoveOfRowAtIndexPath:
Neither UITableViewDataSource nor UITableViewDelegate protocols give me hooks for this. Or did I miss something?
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
use this now when you will start to scroll the tableview then
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
will start to work.
when you are scrolling then
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
will call.
At the end of your scrolling this method will start to work,
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
I hope you have understood.May be it will help you.
Thanks