Here i need to hide the phone number, email , birthDate, anniversary date and other labels in case there is no values for those fields. How can i do this?
Many ways, starting with the simplest:
self.emailLabel.hidden = YES;
But you probably want to reformat the other parts of the view to fit the empty space. Keeping it simple, you would then do something like this:
self.phoneLabel.frame = CGRectOffset(self.phoneLabel.frame, 0, -self.emailLabel.bounds.size.height);
... and so on for anything below. But you can see how this would become tedious. The next and probably best alternative is a UITableView that adjusts it's section count based on whether some of that data is present. That would go like this. Prepare a mutable array of arrays with the parts of your model and their values.
- (void)prepareModel {
self.model = [NSMutableArray array];
[self.model addObject:#[#"Name", #"Judy"]; // get "Judy" from your data
if (/* model has email */) {
[self.model addObject:#[#"Email", #"judy#gmail.com"]; // get email from your model
}
// and so on for conditional parts of your model
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return self.model.count;
}
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
return self.model[section][0];
}
And the cellForRow would init the cell using self.model[section][1].
What you can do is simply hide the UILabel's if the value for the NSStrings that you are putting them in is NULL/nil .
NSString *labelString;
if([labelString length]>0)
{
}
else
Label.hidden = YES;
It is probably a better idea to use a UITableView to do this, by putting the labels in rows of the tables. If the labels are empty, you can delete the table rows and iOS will dynamically resize the table height for you.
Related
I am using grouped tableview for developing a contact list using database. I have to show the message "No Contacts" on tableview when there is no contact in list. how can I do it?
Share your ideas..
Thanks in Advance
supposing that you are using an array to store all the contacts then use the following delegate
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// You can also modify this condition according to a specific section
if([YOUR_ARRAY count] == 0)
{
return 1;
}
else
return [YOUR_ARRAY count];
}
Now adding data to table in following delegate
-(UITableViewCell*)tableView:(UITableView*)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
// Initialise your cell
if([YOUR_ARRAY count] > 0){
// add your array data to cells
}
if([YOUR_ARRAY count] == 0){
// this means no contacts in array and therfore you have only one cell to display NO CONTACTS
}
return cell;
}
For cases like this one we used table headers.
If the table had elements in his data source, the table header was clear and had a 1px height.
If the data source had no elements, then the table header view was set as big as the table's frame and contained a message, an image or whatever you might need.
The functions (table view delegate methods, actually) we used were height for header in section and view for header in section. We verified the data source inside the viewForHeader function
You can achieve the same effect using the table footers as well
you can add UILabel
ande set the text of the label
label.text = #"No results ";
and you make a test
if ([contacts count] == 0)
{
yourTableview.hidden = YES;
yourLabel.hidden = NO;
}
else
{
yourTableview.hidden = NO;
yourLabel.hidden = YES;
}`
I want to wrap the word in section index displaying on the right side of the UItableView.
The problem is that, if the word length increases the section index width also increases and table view cell content view size reduces.And I do not want to display substring of section index array object.Since I want to display whole word in the section i have to wrap it.
-(NSArray*) sectionIndexTitlesForTableView:(UITableView *)tableView
{
NSMutableArray *array = [[NSMutableArray alloc] init];
for (int i = 0; i <[keys count]; i++) {
NSString *str = [self.keys objectAtIndex:i];
[array addObject:str];
}
NSArray *a =[NSArray arrayWithArray:array];
[array release];
return a;
}
object in the array return by sectionIndextitle method is lengthy and I want to wrap the word.
Any one knows how it can be done?
you can only create your own "section index view" as a custom UIView
and it's eazy to do that
just calc the height of your tableview , calc the count of your sections
then draw your section title on it in
- (void)drawRect:(CGRect)rect
then detect the touch event
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
calc which section you touched , then call the tableview method
- (void)scrollToRowAtIndexPath:(NSIndexPath *)indexPath atScrollPosition:(UITableViewScrollPosition)scrollPosition animated:(BOOL)animated;
then put it on your tableview, eazy done!
It seems that your answer is no but the following should solve the problem behind your question.
I would use this function instead tableView:viewForHeaderInSection: on the UITableViewDelegate protocol. More information can be found in the documentation here UITableViewDelegate Docs. Note – tableView:heightForHeaderInSection: must also be implemented. This combination of functions will allow you to return a view with a UILabel subview that has numberOfLines set to 0, i.e. as many as necessary, and the text set to whatever value you need.
It is not possible to wrap section indexes to multiple lines. This wouldn't make sense in the default UI. A custom header is your best bet to accomplish this.
Create a custom title header for section. There you can use the label and assign the number of lines into it on the basis of length of the title. You will also need to set height of section header accordingly.
Just check the 'str' before adding it in NSMutableArray, is it having one or more word?
and select the range how much you want and add it in your array..
USe NSmakeRange to make the range of characters, that you want to show in index of the each section..
I've been looking around on-line for a solution to this, but I can't seem to find anything, and I'm stuck.
I have a NSMutableArray:
productsToDisplay
Which consists of a heap of Product objects that each have a 'name' attribute e.g.
Product *product = ....
NSLog(#"%#", product.name);
Each cell displays a products name and when clicked, displays more information about the product.
However I have a lot of products and would like to split them up into alphabetical sections in the UITableView (like the Contacts on your iPhone are).
Can someone point me in the right direction?
Thanks a lot,
Jack
[EDIT]
I realise I could just sort the array on the name attribute, but I would also like the quick search bar that runs down the right hand side of the UITableView so a user can easily find the section they are looking for.
use this delegate to display the right hand sections list:-
- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView {
return searchArray;
}
use this delegate to associate table content (section) according to right hand list:-
- (NSInteger)tableView:(UITableView *)tableView sectionForSectionIndexTitle:(NSString *)title atIndex:(NSInteger)index {
if (index == 0) {
[tableView scrollRectToVisible:[[tableView tableHeaderView] bounds] animated:NO];
return -1;
}
return index;
}
Add alphabetic sections to ur tableview, then You have to create array of alphabets corresponding to the section in tableview. Like section[0] - 'A', section[1] - 'B', etc.
Add
- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView {
return keys;
}
//the delegate is asking for an array of the values to display in the index.
So the first item in this array will take the user to the first section, which is section 0.
I want to add more columns in my iPhone/iPad application. Is it possible to add more columns in one UITableView? Can you please suggest any sample code/block/project that using multiple columns in one UITableView? Please help me. Thanks in advance.
No it is not possible, in fact UITableView is badly named a represents a List more than a Table.
If you want to have multiple column, one method is to create specific cells, with multiple label, and pack your data by row then column.
short answer is no, but you always can create custom cell what will look like multiple columns
You can use my library, UIGridView.
It is created with UITableView, in which UITableViewCell contains many cells inside.
Here is how it looks like:
No Yuvaraj.M we can't create. but you do something like multicolumn by adding component like label or image or button what u want or else using custom cell.
I've done a grid by using a table view where I have basically faked it by adding subviews to a cell. So if you for example create a cell, add three subviews to it, you can then get the items you need by doing something like this when it asks you for a cell for a specific row:
// get the items for the row (a row is one cell)
NSArray *rowItems = nil;
int startIndex = indexPath.row * NumOfItemViewsPerRow;
if (startIndex + NumOfItemViewsPerRow < [items count]) {
rowItems = [items subarrayWithRange:NSMakeRange(startIndex, NumOfItemViewsPerRow)];
} else {
rowItems = [items subarrayWithRange:NSMakeRange(startIndex, [items count] - startIndex)];
}
Then just after that you can loop the subviews of your row something like this:
[cell.itemViews enumerateObjectsUsingBlock:^(MyItemView *itemView, NSUInteger idx, BOOL *stop) {
NSDictionary *item = [rowItems objectAtIndex:idx];
itemView.titleLabel.text = [item valueForKey:#"title"];
};
It is a bit fiddly, but the upside is that you get row unloading for free from the table view, so you don't have to mess with your own custom grid views or anything like that.
Hope that helps.
I have a tableView that needs to be updated after information has been inserted from another view. If I perform a
[self.tableView reloadData];
The very next time I insert more information in another view and try to reload the table, all the currently visible rows are duplicated.
In other words, when I start up the app I have:
tableView:
Row 1
Row 2
Then I submit some information that will also show up in the table and suddenly I have:
tableView
Row 1
Row 2
Row 3 <- info I just added
Row 1
Row 2
My numberOfRowsInSection implementation looks like this:
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [ItemsController sharedItemsController].count;
}
My cellForRowAtIndexPath implementation looks like this:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
ItemsController* controller = [ItemsController sharedItemsController];
NSMutableArray* recentItems = controller.listOfRecentItems;
CustomCell *cell = nil;
NSUInteger row = [indexPath row];
if( row < recentItems.count )
{
Items* item = [recentItems objectAtIndex:row];
if( recentCellData == nil )
recentCellData = [[NSMutableDictionary alloc] initWithCapacity:[indexPath length]];
if( [recentCellData count] > 0 )
cell = [recentCellData objectForKey:[NSString stringWithFormat:#"%d", row]];
if (cell == nil) {
UIViewController * view1 = [[UIViewController alloc] initWithNibName:#"CustomCell" bundle:nil];
cell = (CustomCell*)[view1 view];
[recentCellData setObject:cell forKey:[NSString stringWithFormat:#"%d",row]];
}
// do some other stuff here
}
// Set up the cell
return cell;
}
What's the best way to update the table and avoid duplicating the currently visible rows.
Thank in advance for all the help!
The error isn't in how you're reloading the table, it's in how you're providing data to it. Set a breakpoint in the data source methods and the method that adds new rows to see where you're going wrong.
You'll only end up with five items if tableView:numberOfRowsinSection: returns 5. Thats the simple answer to your question, but I see other problems here. I'm wondering why you have this test: row < recentItems.count. Is that array the same thing as [ItemsController sharedItemsController].count? You really need to be using the same array for both methods.
(Also, it's not a syntax error, but you shouldn't use the property syntax for things that aren't declared as properties. You should write [recentItems count] instead.)
I'm also confused by the code you use to set up the cell. Cells are meant to be reusable. That is, you create one cell, then reconfigure it every time in your implementation of tableView:cellForRowAtIndexPath:. Your code creates a cell for each item in your list. This is very memory-inefficient, and will likely crash your program due to insufficient memory on the iPhone if you keep lots of cells in memory like this.
The recommended approach is to call dequeueReusableCellWithIdentifier:. If that returns nil, then you set up a cell using the initWithFrame:reuseIdentifier: initializer. The table view is very smart, and will only ask you to redraw the cell when it needs you to.
Your recentCellData dictionary looks really shaky to me, too. What if you insert an item after the item with key #"2"? All the items with key #"3" onward will need to be shifted one element to the right to work the way you expect. That's a ton of bookkeeping that seems rather unnecessary to me. If you really needed something like this -- and to be clear, I don't think you do -- why wouldn't you use an NSMutableArray, which is much easier to use?
I added a bit more info above.