I need a small help. In my project there is a tab bar. On one of the tab bar items there is a navigation controller, on the view there is a table view.
For TableViewController there are the usual codes:
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [myData count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
...
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
// here the DetailViewController is activated
}
The construction of DetailViewController is similar to the TableViewController. The data related to the selected row of TableView will be the key data for the SQL query, the result of which is then stored in an array. The only difference is that I use this:
viewWillAppear: includes and SQL query, then loads the result into the array sqlQueryResult.
- (void)viewWillDisappear:(BOOL)animated {
while( [sqlQueryResult count] >0 )
[sqlQueryResult removeObjectAtIndex:0];
}
This works the very first time when the table DetailView is shown. However, if we go back to TableView and select a different row, DetailView appears but the followings will not run again (as they did already): numberOfSectionsInTableView: or, tableView:(UITableView *)tableView numberOfRowsInSection: . I read in the docs that there are methods that are called only once - however I haven't seen such remark for these ones.
How can I "reset" the TableView? Or what methods should I call to set the number of its rows/sections?
What you're looking for I believe is:
[self.tableView reloadData];
You basically need to send a 'reloadData' message to your tableView. It will then call your methods again to refresh its contents.
Related
I have a UITableView which has master records in it's cell. When the user selects a cell, some detail record is displayed on the same table and this record would be set below that particular cell.
One more thing is the cells that are below the selected cell of the master table will be displayed below the detail view.
In short I want to design a popup that will display the details of selected cell below that particular cell and rest of the cells(cells below the selected cell) of master will be moved down, so that the detail popup can be accomodated between the selected cell and the cells below it.
//Take int selectedCellIndex in your .h file, initialize selectedIndex with -1
//Take BOOL isSelected in your .h file
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
selectedCellIndex = indexPath.row;
isSelected = YES;
[yourTable reloadData];
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
if(indexPath.row==selectedCellIndex)
{
return 100;
}
return 50; //Your default cell size
}
- (UITableViewCell *)tableView:(UITableView *)tV cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
//after creating your cell
if(isSelected && selectedIndex>-1)
{
//Show your custom View , something like [cell.contentView addSubView:customView];
isSelected = NO; //Reset
selectedIndex = -1; //Reset
}
}
You can simply use this
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath method . In here, You can allocate a new UIView every time the user clicks on the cell and display your information in it.
If you have any queries please feel free to reply . :)
Check these projects out, maybe they will of some help ...
Combo Box
Hi I have about 2500 records to be displayed. All these data are coming from a MySQL database. The data will be shown 25 at a time in UITableview similar to itunes store. On click of Load More, I need to fetch the next 25 records.
Note:There is no image only texts.
Have any one done anything similar?Give me the sample code.
first in .h define int row;
and now in viewDidLoad: row=25;
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
if([your array count]>row)
return row+1;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
if (indexPath.row<row)
{
cell.textLabel.text=#"Your Text";
}
else{
cell.textLabel.text=#"Load More";
}
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
if (indexPath.row==row)
{
row=row+25;
[tableView reloadData];
}
`
hope this will help you..
In my app I need to delete multiple rows in a table, edit the table and get a check box beside the table. When checked then the table cells are deleted. It is like the iPhone message app. How can I do this, please help me.
If I understand your question correctly, you essentially want to mark UITableViewCells in some way (a checkmark); then, when the user taps a master "Delete" button, all marked UITableViewCells are deleted from the UITableView along with their corresponding data source objects.
To implement the checkmark portion, you might consider toggling between UITableViewCellAccessoryCheckmark and UITableViewCellAccessoryNone for the UITableViewCell's accessory property. Handle touches in the following UITableViewController delegate method:
- (void)tableView:(UITableView *)tableView
didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *c = [tableView cellForRowAtIndexPath:indexPath];
if (c.accessoryType == UITableViewCellAccessoryCheckmark) {
[c setAccessoryType:UITableViewCellAccessoryNone];
}
//else do the opposite
}
You might also look at this post regarding custom UITableViewCells if you're wanting a more complex checkmark.
You can set up a master "Delete" button two ways:
The IB approach
The programmatic approach
In either case, eventually a method must be called when the master "Delete" button is pressed. That method just needs to loop through the UITableViewCells in the UITableView and determined which ones are marked. If marked, delete them. Assuming just one section:
NSMutableArray *cellIndicesToBeDeleted = [[NSMutableArray alloc] init];
for (int i = 0; i < [tableView numberOfRowsInSection:0]; i++) {
NSIndexPath *p = [NSIndexPath indexPathWithIndex:i];
if ([[tableView cellForRowAtIndexPath:p] accessoryType] ==
UITableViewCellAccessoryCheckmark) {
[cellIndicesToBeDeleted addObject:p];
/*
perform deletion on data source
object here with i as the index
for whatever array-like structure
you're using to house the data
objects behind your UITableViewCells
*/
}
}
[tableView deleteRowsAtIndexPaths:cellIndicesToBeDeleted
withRowAnimation:UITableViewRowAnimationLeft];
[cellIndicesToBeDeleted release];
Assuming by "edit" you mean "delete a single UITableViewCell" or "move a single UITableViewCell," you can implement the following methods in the UITableViewController:
- (void)viewDidLoad {
[super viewDidLoad];
// This line gives you the Edit button that automatically comes with a UITableView
// You'll need to make sure you are showing the UINavigationBar for this button to appear
// Of course, you could use other buttons/#selectors to handle this too
self.navigationItem.rightBarButtonItem = self.editButtonItem;
}
// Override to support conditional editing of the table view.
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath {
// Return NO if you do not want the specified item to be editable.
return YES;
}
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath {
return YES;
}
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
if (editingStyle == UITableViewCellEditingStyleDelete) {
//perform similar delete action as above but for one cell
}
}
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath {
//handle movement of UITableViewCells here
//UITableView cells don't just swap places; one moves directly to an index, others shift by 1 position.
}
You can put 1 UIButton lets call it "EDIT" and wire up it to IBAction. In IBAction write so you will be able to do as per your requirement.
-(IBAction)editTableForDeletingRow
{
[yourUITableViewNmae setEditing:editing animated:YES];
}
This will add round red buttons on the left hand corner and you can click on that Delete button will appear click on that and row will be deleted.
You can implement delegate method of UITableView as following.
-(UITableViewCellEditingStyle)tableView: (UITableView *)tableView editingStyleForRowAtIndexPath: (NSIndexPath *)indexPath
{
//Do needed stuff here. Like removing values from stored NSMutableArray or UITableView datasource
}
Hope it helps.
you want to be looking for deleteRowsAtIndexPath, with all your code squeezed between [yourTable beginUpdates] & [yourTable endUpdates];
the numberOfRowsInSection returns 0 when i press navigationcontroller's back button,
but - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath is called when i put break point...application crashes ..any help please?
you should set the delegate of tableview to nil, dealloc before releasing your table view like this:
- (void)dealloc{
[myTableView setDelegate:nil];
[myTableView release];
myTableView = nil;
}
besides are you trying to reload the table in viewWillDisappear, if yes you should avoid it and find a workaround for this.
Hope this helps.
Try to make the numberOfRowsInSection method return 1
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return 1;
}
I am new to iphone development.I am displaying a xml parsed contents in a grouped tableView.I want disable the click event on it(i should not be able to click it at all) .Since it is grouped table , it contains two tables and i want to disable the first table only and not the second table.How can i achieve it?Please help me out.Thanks.
If you don't want the user to be able to click on a table view, just use this code:
- (NSIndexPath *)tableView:(UITableView *)tableView
willSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
return nil;
}
Use Uitable View delegates and data Sources
//#endif
#pragma mark - UITableViewDataSource
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
NSLog(#"Returning num sections");
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
NSLog(#"Returning num rows");
return [copyListOfItems count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
}
- (NSIndexPath *)tableView:(UITableView *)tableView
willSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
return nil;
}