I am trying to do the following in my application:
I got my data from an online server, and I put them in cells, What I need is to auto loading the data when scrolling down, means for example 10 cells are loaded when the application is running, then when I scroll down 10 other cells are dynamically loaded.
Like the following example:
Thank You per advance,
You can implement this method inside your view controller and get your next record
-(void)scrollViewDidScroll:(UIScrollView *)scrollView{
if (([scrollView contentOffset].y + scrollView.frame.size.height) >= [scrollView contentSize].height){
// Get new record from here
}
}
This is the simplest way to implement paging. if you want to add Activity indicator at the bottom, you can add it inside the same function.
This automatically loads next fragment of data when user is scrolling near the bottom:
#pragma mark - UIScrollViewDelegate
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
if (scrollView.contentSize.height - scrollView.contentOffset.y - scrollView.frame.size.height < 60) {
[self loadRequest];
}
}
Try with this:
STableViewController
STableViewController is best for "Load more" and "Pull to refresh" both.
For iOS 6.0, there is a standard control called UIRefreshControl within sdk. apple doc here
and Other here is a step by step Tutorial give here.
Other Open source library available.
EGOTableViewPullRefresh
PullToRefresh
SVPullToRefresh
QBRefreshControl
STableViewController
You can use Following method for this :
- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath
{
//put data on your array
[tableView reloadData];
}
For Better Understand See this
You'll also get the Source code from here
Hope this will help.
Related
I have this search bar in my app Please see the play, next and previous buttons.
When I search and click on a song from the search items resigning first responder for search bar hides my buttons i.e play, next and previous buttons.
I am using this code
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
MPMediaItem * song;
_nowPlayingIndex=indexPath.row;
if (tableView == self.searchDisplayController.searchResultsTableView)
song = searchResults[_nowPlayingIndex];
else
song = _songs[_nowPlayingIndex];
[self.musicPlayer setNowPlayingItem:song];
[self.musicPlayer play];
_playButton.hidden=true;
_pauseButton.hidden=false;
[_mySearchBar resignFirstResponder];
}
Why are my buttons hidden?
Step 1 : What you can do is make a different function for showing and hiding these buttons or any other item.
Step 2 : You can then call these functions wherever required. e.g. Everytime after you have resigned the responder.
Step 3 : You can try setting the table view frame to some less height from code. And then test this thing. Because I think the height of your table view leads to the hiding of those buttons.
e.g. [self.tableView setFrame: CGRectMake(self.view.frame.origin.x, self.searchSong.frame.origin.y, self.view.frame.size.width, self.view.frame.size.height - "button.height" - "navbar.height")];
Step 4 : Also you should debug your code as to when you execute the resignFirstResponder... please check what is the frame of your buttons. This way you will get to know their position.
Its just another way of solving your issue. If you still have questions, you can ask. I hope it works. :)
This is what i was looking for
- (void)searchDisplayController:(UISearchDisplayController *)controller didShowSearchResultsTableView:(UITableView *)tableView{
CGRect tableFrame= self.searchDisplayController.searchResultsTableView.frame;
tableFrame.size.height=200;
tableFrame.size.width=300;
[self.searchDisplayController.searchResultsTableView setFrame:tableFrame];
[self.searchDisplayController.searchResultsTableView reloadData];
}
and this [[myButton superview] bringSubviewToFront:myButton]; for bringing them to front.
when you search anything apply code to your buttons is search delegate
[grayBar bringSubViewToFront];
or
[yourButton1 bringSubViewToFront];
[yourButton2 bringSubViewToFront];
[yourButton3 bringSubViewToFront];
hope this helps
I have been though a ton of examples that show how to do a collapsable tableview but I cant find something that works with static cells. I have a couple cells that I made in IB that I would like to collapse if the section header is clicked but I cant figure out or understand how to do it. If anyone can tell me or point me to an example that does that, I would be grateful.
Here is an example of just one of the cells I have that would need to collapse:
You can refer to this sample: (download the sample code)
http://developer.apple.com/library/ios/#samplecode/TableViewUpdates/Introduction/Intro.html
So basically what this code does is:
You create Section in your -(UIView*)tableView:(UITableView*)tableView viewForHeaderInSection:(NSInteger)section --> Each Section has SectionHeaderView --> Which you basically will tap and expand your table view.
You will implement the two delegate methods:
-(void)sectionHeaderView:(APLSectionHeaderView*)sectionHeaderView sectionOpened:(NSInteger)sectionOpened
-(void)sectionHeaderView:(APLSectionHeaderView*)sectionHeaderView sectionClosed:(NSInteger)sectionClosed
--> This will internally call insertRowsAtIndexPaths and deleteRowsAtIndexPaths --> Which will internally call tableview:cellForRowAtIndexPath --> Now here you need to create your cell which will have address, city etc etc...
Let me know if you need more information.
I finally found a solution I was happy with thanks to this: https://github.com/xelvenone/StaticDataTableViewController
A very simple solution with the implementation:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
self.reloadTableViewRowAnimation = UITableViewRowAnimationMiddle;
self.deleteTableViewRowAnimation = UITableViewRowAnimationMiddle;
self.insertTableViewRowAnimation = UITableViewRowAnimationMiddle;
if (indexPath.row == 0) {
[self toggleCellVissibilityOrReload:self.cell1];
}
[self reloadDataAnimated:YES];
}
Is there an easy way to reload the suppplementary view only in a UICollectionViewFlowLayout? I don't want to reload the whole thing. Is it possible to do so?
After reviewing the documentation, I'm not sure about reloading an individual supplementary view, but you can use reloadSections: to update 1 or more sections in the UICollectionView. (documentation) So when a section header needs updating, you can call:
Objective-C:
[self.collectionView reloadSections:[NSIndexSet indexSetWithIndexesInRange:NSMakeRange(0, 3)]];
Swift:
self.collectionView?.reloadSections(IndexSet(0 ..< 3))
Which happens to call:
- (UICollectionReusableView *)collectionView: (UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath {
//Place logic for handling update here...
}
If you want to change the layout or size of the supplementary view from the Controller, use[self.collectionView.collectionViewLayout invalidateLayout].If you want to refresh the supplementary view only,use [supplementaryView setNeedsDisplay].Use both if the supplementary view is complex and/or will change its dimensions.
Two UITableViewCell related questions:
In my custom UITableViewCell I loop through an array (of which I do not know how many objects it holds) and add a UILabel displaying some text for each object in that array.
This means I have to adjust the height of the cell so that these labels fit in. How can I do this?
When going into edit mode, I have the cells indent, however I do not want this. I have tried the following:
cell.shouldIndentWhileEditing = NO;
and
-(BOOL)tableView:(UITableView *)tableView shouldIndentWhileEditingRowAtIndexPath:(NSIndexPath *)indexPath
{
return NO;
}
Both sadly failed, I have I no idea why. How could I possible remedy this?
Any help is much appreciated with either of these issues, thanks.
You can specify the height for every row with the delegate method [UITableViewDelegate tableView:heightForRowAtIndexPath:].
Just change what the method returns and the reload your table.
This method actually has nothing to do with the indendation of cell content:
Asks the delegate whether the background of the specified row should be indented while the table view is in editing mode.
You can try to set indentationWidth but I never managed to make it work.
Fortunately, it's easy to change everything you want in [UITableView layoutSubviews] method.
Example:
- (void)layoutSubviews {
[super layoutSubviews];
self.contentView.frame = self.bounds;
}
You may also need to set
- (UITableViewCellEditingStyle)tableView:(UITableView *)tableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath;
{
return UITableViewCellEditingStyleNone;
}
For the dynamic height part there are plenty of other answers and a quick google found a tutorial here
I'm trying to set up a search display controller to handle async results from a web service. I've got the basic bits in place but have run into a really strange issue that I can't figure out.
Seems like to rig up the search display controller for async you really just need to do two things:
return NO for
searchDisplayController:shouldReloadTableForSearchString,
and
handle searchBarSearchButtonClicked
and fire off the table reload
myself.
I'm doing both of these but what I'm seeing is that the search display controller is reloading the table on the first character typed into the search bar even though I'm returning NO as per #1. It doesn't reload on subsequent characters entered.
So, my question is: how do I keep the search display controller from trying to reload the table while the user is typing? (specifically on that first character entered)
I've seen this issue mentioned as part of a couple of other questions but I have not seen a direct answer to the problem. I'd like to understand what's going on or what I'm doing wrong before I resort to a bunch of UI mangling to work around it.
Here's a quick distillation of my code to show the issue. When I run this and type "abcde" into the search bar, after I type "a" the results display as "a #0", "a #2", etc. They don't update again until I hit the search button then you see "abcde #0", "abcde #1", etc. Desired result is, of course, nothing happens until I hit the search button.
#pragma mark -
#pragma mark UISearchDisplayController Delegate Methods
- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString {
return NO;
}
- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchScope:(NSInteger)searchOption {
return NO;
}
#pragma mark -
#pragma mark UISearchBarDelegate Methods
- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar {
[self.searchDisplayController.searchResultsTableView reloadData];
}
#pragma mark -
#pragma mark Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return 20;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
}
cell.textLabel.text = [self.searchDisplayController.searchBar.text stringByAppendingFormat:#" #%d", indexPath.row];
return cell;
}
Thanks! (btw, this is my first question asked here—please let me know if I miss any points of etiquette :)
This is just the way UISearchDisplayController (SDC) works. When the user enters the first character into the searchBar the searchTable is loaded and displayed for the first time causing it to load. The methods "...shouldReloadTableForSearchString" and "...shouldReloadTableForSearchScope" allow you to control whether the searchTable reloads automatically on subsequent chars or a scope change.
I've done both of the following to provide a good user experience on the first character. Slight disclaimer: I do have implementations of both of these that work but this is simply a framework for implementation from my memory. I may have missed a detail but this should get you pretty close.
Option 1: Present a "loading" cell in the searchTable when the first char is typed.
This option allows the SDC to display the searchResultsTableView when the user types the first char, display status as to the current search/filter operation
in the SDC delegate class definition
add the iVar BOOL isLoading
add the iVar UITableView *searchTableView
in searchDisplayController:didLoadSearchResultsTableView
set searchTableView = tableView
in shouldReloadTableForSearchString/Scope
set isLoading = YES
call your method to load data in the background
return NO
when your background filter is complete:
set isLoading = NO
[searchTableView reloadData]
in the various tableView delegate methods respond how you like to show status if there are current search results or results are loading in the background. What I did is:
if there are current search results, show results (even if loading/filtering in the background)
if there are no search results and isLoading == NO return 1 row and show 'No matches' in a cell
if there are no search results and isLoading == YES return 1 row and and show search activity in a cell (I typically use UIActivityIndicatorView)
Option 2: Hide the searchTableView and display an overlay view in it's place until search results are loaded
This option hides the searchTableView when it is first loaded and only redisplays it if when the search/filter is complete. I defined this as an add on to option 1 as they can be done together though to optimize things you may not care about showing search activity in the searchResultsTableView if you are hiding the table and showing the overlay.
in the SDC delegate class definition
same as Option 1
add the iVar UIView *searchTableOverlayView
in searchDisplayController:didLoadSearchResultsTableView
same as Option 1
create a UIView to use as an overlay in place of searchTableView containing whatever UI is appropriate for your app and set it to searchTableOverlayView
in searchDisplayController:didUnloadSearchResultsTableView
release searchTableOverlayView
in 'searchDisplayController:didShowSearchResultsTableView(may be able to do this insearchDisplayController:willShowSearchResultsTableView`
if there are search results to display or isLoading == NO
seachTableOverlayView.hidden == YES
else (if isLoading == YES)
searchTableOverlayView.frame == searchResultsTableView.frame
add seachTableOverlayView as a subview of searchTableVIew.superview
searchTableView.hidden = YES
when your background filter is complete
same as option 1
if there are searchResults to display
searchTableCoverView.hidden = YES
searchResultsTableView.hidden = NO
else
searchResultsTableView.hidden = YES
searchTableCoverView.hidden = NO
in the various tableView delegate methods respond how you like to show status if there are current search results or results are loading in the background. What I did is:
same as option 1
Unfortunately I believe this is just how the UISearchDisplayController functions. You should file a bug report to Apple if you want to request different options for functionality.
The alternative would be to write your own UISearchBar and UITableView combination similar to how UISearchDisplayController works, then you'll get better control.
Hope this helps!
When I faced the same issue I tried to put an overlay view on search result view. That didn't help me. Looks like Apple change the behavior and I saw cell separators shone through my view. Finally I came up with a good approach.
At first my async search class had it's own overlay, progress and other views. UISearchDisplayController was used only for start, end delegate methods calls and sticking to default search flow.
To show view I used any subview I can put a search views on (as an init call):
newView.frame = frame;
[view addSubview:newView];
and then use the subview when changing my search progress views:
if (view == currentView)
return;
view.frame = currentView.frame;
view.alpha = [self getAlphaValueForView:view];
UIView * superView = [currentView superview];
[currentView removeFromSuperview];
currentView = view;
[superView addSubview:currentView];
The problem with empty search result table view blinking appears when I start to use my search content controller in default navigation routine (navigation controller).
So to solve the problem I start using for navigation not a content controller (in this case the default search display controller activating) but an empty controller. And I used empty controllers view as a subview for search views.
So in total: DO NOT use UISearchDisplayController's content view controller in navigation. Use stub view controller. And then use it's view to put your views as subviews.
Worked great for me.
Hide self.searchDisplayController.searchResultsTableView until user presse search button
- (void)searchDisplayController:(UISearchDisplayController *)controller didLoadSearchResultsTableView:(UITableView *)tableView;
{
tableView.hidden = YES;
}
After user press the search key, and the search results get ready, make the search result table visible
self.searchDisplayController.searchResultsTableView.hidden = NO;
[self.searchDisplayController reloadData]
This workaround works for me.
Maybe you need to implement UISearchDisplayController and then this function:
- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText