If you have used Messages application in iOS, you know how we could invoke UITableViewCellAccessoryCheckmark in any message through edit button and then select each bubble/cell for forward or deletion purpose.
I'm trying to do the same in my application. I can tap on edit and UITableViewCellAcessoryCheckMark is shown, but I can't select the cells using it. What more do I need to implement?
Any help would be appreciated. Here is the code -
- (void)viewDidLoad
{
[super viewDidLoad];
self.navigationItem.rightBarButtonItem = self.editButtonItem;
}
- (UITableViewCellEditingStyle)tableView:(UITableView *)tableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath
{
return UITableViewCellAccessoryCheckmark;
}
For a table view as shown in the picture, where one or more cells can be selected with a checkmark symbol, you have to set allowsMultipleSelectionDuringEditing = YES on the table view. This can be done either in viewDidLoad with
self.tableView.allowsMultipleSelectionDuringEditing = YES
or in the Attributes Inspector of the table view in the NIB/Storyboard file by setting "Editing" to "Multiple Selection During Editing".
The tableView:editingStyleForRowAtIndexPath: method is not needed for this.
(And btw your method returns UITableViewCellAccessoryCheckmark which is a UITableViewCellAccessoryType and not a UITableViewCellEditingStyle.)
Related
UItableView is showing with empty rows like below...
how to hide it without changing the tableview style. Do I need to resize the table View, if so how can I know the height exactly to set.
self.tableView.tableFooterView = [[UIView alloc] init];
you add UIview in footer of uitabeview use of xib or tableview delegate method
- (CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section;
{
return 1;
}
- (UIView *)tableView:(UITableView *)tableView viewForFooterInSection:(NSInteger)section;
{
return yourview;
}
What I had done in one of my projects was to set the tableview's background color to clearColor and separator to none.
Just drag and drop a view from object library to the TableView empty shell in storyboard. Make the view as footer of the table view (in document outline drag it below the cell's if it is not already at below) make the height of the view '0'. You will not see the view in storyboard because its height is '0' but when its runs it will hide the cells. I think that should work.
Why don't you put some logic into your
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
function?
Just return the number of cells which are really filled with data
I have a view based application and a UITableview in the view.
I set the dataSource , delegate and tableView to "File's Owner" when i click on the tableview
then clicking on the Files owner i set the tableView to Table View , view to View , datasource to Table View and delegate to Table view in the outlets.
- (void)viewDidLoad
{
[super viewDidLoad];
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)videoView {
return 1;
}
// Customize the number of rows in the table view.
- (NSInteger)videoView:(UITableView *)videoView numberOfRowsInSection:(NSInteger)section {
return 0;
}
// Customize the appearance of table view cells.
- (UITableViewCell *)videoView:(UITableView *)videoView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [videoView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease];
}
// Set up the cell...
return cell;
}
- (void)tableView:(UITableView *)videoView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
when i run the application for the simulator i get the following error
"tableView:numberOfRowsInSection:]: unrecognized selector sent to instance 0x6029710
"
i get the feeling that tableviews require different implementation when used in view based app rather than a navigation based application. I would be very thankful if anyone can guide me to what needs to be done to get this displayed properly.thanks.
The implementation is the same whether you are in a view-based or navigation-based application. What this error message is telling you is your table view tried to call tableView:numberOfRowsInSection: on its data source, but that the data source didn't implement a method with that name. Sure enough, looking at your sample code, you implement a method called videoView:numberOfRowsInSection: instead of tableView:numberOfRowsInSection:.
For a delegate implementation you can't change tableView to videoView. Should be:
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return 0;
}
You need to fix the other cellForRowAtIndexPath as well!
I set the dataSource , delegate and tableView to "File's Owner" when i
click on the tableview then clicking on the Files owner i set the
tableView to Table View , view to View , datasource to Table View and
delegate to Table view in the outlets.
It's difficult to understand what you've done here. You set the table's data source to the table view itself?
when i run the application for the simulator i get the following error
"tableView:numberOfRowsInSection:]: unrecognized selector sent to
instance 0x6029710 "
What object is at address 0x6029710? It's surely the object that you set as the table's data source, but it doesn't implement the UITableViewDataSource protocol.
i get the feeling that tableviews require different implementation
when used in view based app rather than a navigation based
application.
There's really no difference between a "view based app" and a "navigation based app." There are "view based" and "nav based" project templates, but those are just two different starting points for your app. UITableView doesn't care which one you use.
I have a core data/ uitableview based app. Actually 80% of the code so far is equal to the Apple Sample app CoreDataRecipes. My problem is that when I enter the edit mode (by pushing the edit button), there are no "delete badges" on the left side of the rows. Bumper.
The differences in code with CoreDataRecipes:
I have custom UITabelview cell with
a nib file instead of code only.
My Tableview is an Outlet inside my class view. So my class
RecipeListTableViewController is an
UIViewController with Tableview delegates instead of a UITableViewController
What I tried:
The Tableview works fine. There are no linking or delegate issues
I checked if the table actually
enters the edit mode. It does. You
can see that because the "Add" button
is disabled.
I checked if the editingstyle is ok. It should be by default but to make sure I added:
(UITableViewCellEditingStyle)tableView:(UITableView*)tableVieweditingStyleForRowAtIndexPath(NSIndexPath*)indexPath {return UITableViewCellEditingStyleDelete;}
I checked if the delete icons where not behind my cellview. There are not. I now think that the cell behaviour of moving to the right is handled by iOS.
When I swipe the cell, the right delete button appears and works as it should
I tried to build the behaviour my self with a layoutSubviews. Nothing changed when entering the edit mode. But when I swipe, now I see my subview in one row:
Anyone any ideas? It must be something simple.
Make sure that
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
{
return YES;
}
If this is not set to return YES then the badges will not be enabled. The default is set to return NO
I think you have not added the line
tableView.editing=YES on clicking the Edit button
Try by setting it!
Since yours is a UIViewController, the tableview doesnt get the setEditing call. Just add:
- (void)setEditing:(BOOL)editing animated:(BOOL)animated {
[super setEditing:editing animated:animated];
[self.tv setEditing:editing animated:YES];
}
Make sure you have setup the outlet/ delegate/ datasource
then these:
-(void)editButtonTapped
{
[self.tableView setEditing:YES animated:YES];
}
-(BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
{
return YES;
}
-(UITableViewCellEditingStyle)tableView:(UITableView *)tableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath
{
return UITableViewCellEditingStyleDelete;
}
I have refered "Managing the reordering of rows" in "UITableView Programming Guide".
I have written the same code for my application for rearranging the rows of tableView but not able to rearrange the rows in tableView. The delegates "canMoveRowAtIndex" and "moveRowAtIndex" have not been called though I set tableView in editing mode through "setEditing:animated".I dont want to use core data for implementing this.
Can u provide the detailed code for this?? (I would like rearrange the rows of tableView as we do for icons by long press and then moving them)
Are you sure to add properly the "Edit" button ?
On my code (withoutcoredata), with a navigation controller, I have:
- (void)viewDidLoad {
[super viewDidLoad];
self.navigationItem.rightBarButtonItem = self.editButtonItem;
}
- (void)setEditing:(BOOL)editing animated:(BOOL)animate
{
[super setEditing:editing animated:animate];
[self.navigationItem setHidesBackButton:editing animated:YES];
}
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath
{
return YES;
}
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)sourceIndexPath toIndexPath:(NSIndexPath *)destinationIndexPath {
//...
}
If the methods aren't being called, chances are you either haven't set the table view instance's delegate outlet to point to your controller, or you've spelled the names of the delegate methods incorrectly.
One trick to help avoid misspellings is to go to the header file where the methods are declared (in this case, UITableViewController.h) copy the method declaration(s), and paste them into your source file. Otherwise, I try to use Xcode's completion mechanism to ensure that I don't accidentally misspell things.
In my application I have this requirement that first tap on custom cell of uitableview with a label in it should expand it and second should contract it. I'm able to expand and contract cell and expand label inside cell, but not able to contract the label on second tap.
I'm using this function
- (void)setSelected:(BOOL)selected animated:(BOOL)animated {
[super setSelected:selected animated:animated];
if( selected == YES ) {
[self expandRow];
}
else {
[self contractRow];
}
height = [lblFeed frame].size.height + 75;
}
expandRow expands the label and contractRow contracts it. I'm perplexed as for how many rows this function gets called. It doesn't get called only for the cell tapped, it gets called more number of times for single tap on single cell may be for other cells but I'm not getting which rows.
This' really urgent.
Can anybody please help?
Tapping a selected row doesn't cause it to be deselected. When a cell gets selected, it stays selected until deselectRowAtIndexPath:animated: gets called on its table. That's why your method isn't getting called for the second tap.
In an MVC architecture like UIKit, it's recommended that you handle user interactions in your controller classes. It would be appropriate to override -[UITableViewCell setSelected:animated:] if all you were doing was customizing the way the view represents a selected cell, but in this case your expand/contract toggle behavior would require a change in the way UITableView selects and deselects its cells.
You could subclass UITableView and implement this toggle behavior yourself, or you can leave UITableView alone and handle it all at the UIViewController level by doing something like this:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
if ([self.expandedIndexPath isEqual:indexPath]) {
[(YourCustomCell *)[self tableView:tableView cellForRowAtIndexPath:indexPath] contractRow];
self.expandedIndexPath = nil;
}
else {
if (self.expandedIndexPath) {
[(YourCustomCell *)[self tableView:tableView cellForRowAtIndexPath:self.expandedIndexPath] contractRow];
}
[(YourCustomCell *)[self tableView:tableView cellForRowAtIndexPath:indexPath] expandRow];
self.expandedIndexPath = indexPath;
}
[tableView deselectRowAtIndexPath:indexPath animated:NO];
}
I would suggest that you don't add your functionality on top of the selected property of the cell, which has slightly different behaviour than you expect.
Just add your own BOOL expanded property, and see how that works. You should probably call it from the UITableView delegate methods, too.