How do i add a space between 2 sections in a tableView.
Once i added the following code in the
titleForHeaderInSection
if (section==0)
return #"sec 1";
else return #"sec 2";
then, the following
viewForFooterInsection
vi = [[UIView alloc]initWithFrame:CGRectMake(0,0,300,100) ];
la = [[UILabel alloc] initWithFrame:CGRectMake(0,0,300,50)];
la.text=#"............long text..";
[vi addSubView:la];
return vi;
When i make the label Height to 30, it displays 1/2 of the text. Therefore i will need to increase the Height of the label. Then when i increase the Height the 2nd sections Header overlaps. How can i solve this ?
You have to specify the footer height in your tableview delegate, like:
- (CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section
{
// Switch here if you like different heights for footers
return 50.0f;
}
The answer lies in the tableView's style. The style that you see is UITableViewStylePlain, where the sections are not separated. What you are looking for is UITableViewStyleGrouped. This can be given in two places.
If you are creating a tableView, use its initializer
UITableView *tableView=[[UITableView alloc] initWithFrame:someRect style:UITableViewStyleGrouped];
Or, if you are creating a UITableViewController
UITableViewController *tbvc=[[UITableViewController alloc] initWithStyle:UITableViewStyleGrouped];
Related
Ok, This is an old issue almost every iOS developer has struggled with. Many answers on the subject are a available.
However I still haven't found a really practical, generic solution for calculating a UITableViewCell's height in tableView:heightForRowAtIndexPath:.
I understand how the layout mechanism of UITableView works (it calculates the height of the whole table before actually laying out any cells).
I also understand that one basically has to anticipate everything that will happen in UITableViewCells layout method using for example sizeWithFont:... methods on NSString.
I assume that the style of the cell is UITableViewCellStyleSubtitle to begin with (we can get more generic later!).
These would be my requirements:
the cell might be in a grouped or plain tableView
the system version might be iOS 6 or iOS 7+
an image might or might not be set in cell.imageView
an accessory view might or might not be set
cell.textLabel might or might not contain text.
cell.detailTextLabel might or might not contain text.
fonts might be customized
the labels might be multi-line
the table width is arbitrary (portrait, landscape, iPad...)
the number of cells is limited (probably some dozen)
In most cases this kind of dynamic cell would be used in short lists (maybe some kind of detail view) so I think it would be viable to pre-calculate the cells like described here: https://stackoverflow.com/a/8832778/921573
I am looking for an implementation for calculating the cell height that satisfies the given requirements.
I'd be very happy if anyone could share some insights & experience - thanks in advance!
You could keep a single dummy cell in your table view's delegate and let it calculate its own required size.
The best way to make custom cells with different heights is:
make a NSMutableArray for cells:
#property (nonatomic,retain)NSMutableArray* cellsArray;
then in m.:
the first method which call is
-(float)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
make your cell here:
-(float)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
if (!self.cellsArray) {
self.cellsArray = [[NSMutableArray alloc]init];
}
ListCell* cell = [[ListCell alloc] initWithFrame:CGRectMake(x, y, width, height)];
// IMPLEMENT your custom cell here, with custom data, with custom,different height:
// after add this cell to your array:
[self.cellsArray addObject:cell];
// IMPORTANT STEP: set your cell height for the new height:
cell.frame = CGRectMake(cell.frame.origin.x, cell.frame.origin.y, 303, yourLastItemInCell.frame.origin.y + yourLastItemInCell.frame.size.height);
return cell.frame.size.height;
}
after you got the custom cells with different heights :
#pragma mark - conform to delegates
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return 10;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
return self.cellsArray[indexPath.row];
}
I hope it helps !
EDIT:
tableView = [[UITableView alloc] initWithFrame:frame style: UITableViewStylePlain];
tableView.delegate = self;
tableView.dataSource = self;
tableView.backgroundColor = [UIColor clearColor];
tableView.separatorStyle = UITableViewCellSeparatorStyleNone;
Im using a tableview to display some information in a quiz app that Im working on. My question is how do i make the tableview only show the number of cells that I need. Ive set the number of rows delegate method like this:
-(NSInteger) tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return 5;
}
but at the bottom of the table view are empty cells that are not needed. If I set the tableview style to grouped I get 5 cells and no empty ones below them. Ive seen that other people have done this but cant seem to work it out. I was wondering if they have somehow added a custom view to the table footer to cancel the empty cells out?
Any ideas or help appreciated.
If you do want to keep the separator, you could insert a dummy footer view. This will limit the tableview to only show the amount of cells you returned in tableView:numberOfRowsInSection:
self.tableView.tableFooterView = [[UIView alloc] initWithFrame:CGRectZero];
In swift:
self.tableView.tableFooterView = UIView(frame: CGRectZero)
A much nicer method which doesn't require cell resizing is to turn off the default separator (set the style to none) and then have a separator line in the cell itself.
I was having a similar problem, how to show only separators for the cells that contain data.
What I did was the following:
Disable separators for the whole tableView. You can do that in the
inspector for the tableview in Interface builder or by calling
[yourTableView setSeparatorStyle:UITableViewCellSeparatorStyleNone];.
Inside your cellForRowAtIndexPath where you populate your tableview with cells create a new UIView and set it as a subview to the cell. Have the background of this view lightgray and slightly transparent. You can do that with the following:
UIView *separatorView = [[UIView alloc] initWithFrame:CGRectMake:
(0, cell.frame.size.height-1,
cell.frame.size.width, 1)];
[separatorView setBackgroundColor:[UIColor lightGrayColor]];
[separatorView setAlpha:0.8f];
[cell addSubView:separatorView];
The width of this view is 1 pixel which is the same as the default separator, it runs the length of the cell, at the bottom.
Since cellForRowAtIndexPath is only called as often as you have specified in numberOfRowsInSection these subviews will only be created for the cells that possess data and should have a separator.
Hope this helps.
This worked for me - I had extra empty rows at the bottom of the screen on an iphone 5 -
In my case I needed 9 rows
- (CGFloat)tableView:(UITableView *)tabelView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return self.tableView.frame.size.height / 9;
}
You can implement heightForRowAtIndexPath: and compute the correct height to only show 5 cells on the screen.
Are you always going to have 5 rows? If it's a dynamic situation you should set the number of rows according to the datasource of the tableview. For example:
return [postListData count];
This returns the count of the records in the array holding the content.
The tableview is only going to display the number of rows and sections that you tell it to. If you're always going to have just a single section, DON'T implement the method below.
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 2;
}
Without this the tableview will only have 1 section. With it, as you would imagine, you can specify the number of sections.
It is quite Simple. Just set the size of the popover like this:
self.optionPickerPopOver.popoverContentSize = CGSizeMake(200, 200);
Certainly you can adjust the size (200,200) depending upon the size of contents and number if rows.
Easy way would be to shrink tableView size. I.e. 5 cells 20 points each gives 100.0f, setting height to 100.0f will cause only 5 rows will be visible. Another way would be to return more rows, but rows 6,7 and so would be some views with alpha 0, but that seems cumbersome. Have you tried to return some clerColor view as footerView?
I think u can try changing the frame of the table view, if you want to adjust with the number of cells.
Try something like this:
[table setFrame:CGRectMake(x, y, width, height*[list count])];
height refers to height of the cell
As Nyx0uf said, limiting the size of the cell can accomplish this. For example:
- (CGFloat)tableView:(UITableView *)tabelView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
CGFloat result;
result = 100;
return result;
}
implement these two methods in your UITableViewController:
- (UIView *)tableView:(UITableView *)tableView viewForFooterInSection:(NSInteger)section
{
if (section == tableView.numberOfSections - 1) {
return [[UIView alloc] initWithFrame:CGRectMake(0, 0, 1, 1)];
}
return nil;
}
- (CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section
{
if (section == tableView.numberOfSections - 1) {
return 1;
}
return 0;
}
In fact, these codes are telling tableview that you don't need to render the seperator line for me anymore, so that it looks the empty cells won't be displayed(in fact , the empty cell can not be selected too)
i am using a UITextView inside a tableView cell in order edit text.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
UITextField *textName = [[UITextField alloc] initWithFrame:CGRectMake(0, 0, 270, 24)];
[cell addSubview:textName];
[textName release];
}
This works, but when running it on the iPad it isn't correct.
I've tried to determine the width of cell using
cell.contentView.frame.size.width
but this always returns 320.0 for both iPhone and iPad
Also on the iPad when in landscape mode shouldn't the width of cell be bigger?
Teo
Ideally you'd create a custom UITableViewCell and adjust your control sizes/positions in layoutSubviews.
If you're going to add the control in tableView:cellForRowAtIndexPath:, then you can get the width from the tableView itself:
UITextField *textName = [[UITextField alloc] initWithFrame:CGRectMake(0, 0, tableView.frame.size.width-50, 24)];
The iPad cell is resized when it's added to the table, after your function returns. If you want the text field to resize with the cell, you can do something like textName.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight.
You should add custom views to contentView (i.e. [cell.contentView addSubview:textName]). The content view automatically shrinks to handle editing mode, among other things.
Subclassing UITableViewCell is a bit overkill if you just want to tweak layout — it's my impression that auto-resizing is faster than manual sizing using layoutSubviews.
I have a UITableView with two sections. It is a simple table view. I am using viewForHeaderInSection to create custom views for these headers. So far, so good.
The default scrolling behavior is that when a section is encountered, the section header stays anchored below the Nav bar, until the next section scrolls into view.
My question is this: can I change the default behavior so that the section headers do NOT stay anchored at the top, but rather, scroll under the nav bar with the rest of the section rows?
Am I missing something obvious?
Thanks.
The way I solved this problem is to adjust the contentOffset according to the contentInset in the UITableViewControllerDelegate (extends UIScrollViewDelegate) like this:
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
CGFloat sectionHeaderHeight = 40;
if (scrollView.contentOffset.y<=sectionHeaderHeight&&scrollView.contentOffset.y>=0) {
scrollView.contentInset = UIEdgeInsetsMake(-scrollView.contentOffset.y, 0, 0, 0);
} else if (scrollView.contentOffset.y>=sectionHeaderHeight) {
scrollView.contentInset = UIEdgeInsetsMake(-sectionHeaderHeight, 0, 0, 0);
}
}
Only problem here is that it looses a little bit of bounce when scrolling back to the top.
{NOTE: The "40" should be the exact height of YOUR section 0 header. If you use a number that is bigger than your section 0 header height, you'll see that finger-feel is affected (try like "1000" and you'll see the bounce behaviour is sort of weird at the top). if the number matches your section 0 header height, finger feel seems to be either perfect or near-perfect.}
You can also add a section with zero rows at the top and simply use the footer of the previous section as a header for the next.
Were it me doing this, I'd take advantage of the fact that UITableViews in the Plain style have the sticky headers and ones in the Grouped style do not. I'd probably at least try using a custom table cell to mimic the appearance of Plain cells in a Grouped table.
I haven't actually tried this so it may not work, but that's what I'd suggest doing.
I know it comes late, but I have found the definitive solution!
What you want to do is if you have 10 sections, let the dataSource return 20. Use even numbers for section headers, and odd numbers for section content. something like this
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
if (section%2 == 0) {
return 0;
}else {
return 5;
}
}
-(NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {
if (section%2 == 0) {
return [NSString stringWithFormat:#"%i", section+1];
}else {
return nil;
}
}
Voilá! :D
Originally posted Here, a quick solution using the IB. The same can be done programmatically though quite simply.
A probably easier way to achieve this (using IB):
Drag a UIView onto your TableView to make it its header view.
Set that header view height to 100px
Set the tableview contentInset (top) to -100
Section headers will now scroll just like any regular cell.
Some people commented saying that this solution hides the first header, however I have not noticed any such issue. It worked perfectly for me and was by far the simplest solution that I've seen so far.
There are several things that need done to solve this problem in a non-hacky manner:
Set the table view style to UITableViewStyleGrouped
Set the table view backgroundColor to [UIColor clearColor]
Set the backgroundView on each table view cell to an empty view with backgroundColor [UIColor clearColor]
If necessary, set the table view rowHeight appropriately, or override tableView:heightForRowAtIndexPath: if individual rows have different heights.
I was not happy with the solutions described here so far, so I tried to combine them. The result is the following code, inspired by #awulf and #cescofry. It works for me because I have no real table view header. If you already have a table view header, you may have to adjust the height.
// Set the edge inset
self.tableView.contentInset = UIEdgeInsetsMake(-23.0f, 0, 0, 0);
// Add a transparent UIView with the height of the section header (ARC enabled)
[self.tableView setTableHeaderView:[[UIView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 100.0f, 23.0f)]];
Just change TableView Style:
self.tableview = [[UITableView alloc] initwithFrame:frame style:UITableViewStyleGrouped];
UITableViewStyle Documentation:
UITableViewStylePlain-
A plain table view. Any section headers or footers are displayed as inline separators and float when the table view is scrolled.
UITableViewStyleGrouped-
A table view whose sections present distinct groups of rows. The section headers and footers do not float.
Select Grouped Table View style from your tableView's Attribute Inspector in storyboard.
Set the headerView of the table with a transparent view with the same height of the header in section view. Also initi the tableview with a y frame at -height.
self.tableview = [[UITableView alloc] initWithFrame:CGRectMake(0, - height, 300, 400)];
UIView *headerView = [[[UIView alloc] initWithFrame:CGRectMake(0, 0, width, height)] autorelease];
[self.tableView setTableHeaderView:headerView];
Change your TableView Style:
self.tableview = [[UITableView alloc] initwithFrame:frame style:UITableViewStyleGrouped];
As per apple documentation for UITableView:
UITableViewStylePlain- A plain table view. Any section headers or
footers are displayed as inline separators and float when the table
view is scrolled.
UITableViewStyleGrouped- A table view whose sections present distinct
groups of rows. The section headers and footers do not float. Hope
this small change will help you ..
I found an alternative solution, use the first cell of each section instead a real header section, this solution don't appears so clean, but works so fine, you can use a defined prototype cell for your headers section, and in the method cellForRowAtIndexPath ask for the indexPath.row==0, if true, use the header section prototype cell, else use your default prototype cell.
Now that the grouped style looks basically the same as the plain style in iOS 7 (in terms of flatness and background), for us the best and easiest (i.e. least hacky) fix was to simply change the table view's style to grouped. Jacking with contentInsets was always a problem when we integrated a scroll-away nav bar at the top. With a grouped table view style, it looks exactly the same (with our cells) and the section headers stay fixed. No scrolling weirdness.
Assign a negative inset to your tableView. If you have 22px high section headers, and you don't want them to be sticky, right after you reloadData add:
self.tableView.contentInset = UIEdgeInsetsMake(-22, 0, 0, 0);
self.tableView.contentSize = CGSizeMake(self.tableView.contentSize.width, self.tableView.contentSize.height+22);
Works like a charm for me. Works for section footers as well, just assign the negative inset on the bottom instead.
I add the table to a Scroll View and that seems to work well.
Check my answer here. This is the easiest way to implement the non-floating section headers
without any hacks.
#LocoMike's answer best fitted my tableView, however it broke when using footers as well.
So, this is the corrected solution when using headers and footers:
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return (self.sections.count + 1) * 3;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
if (section % 3 != 1) {
return 0;
}
section = section / 3;
...
}
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
if (section % 3 != 0) {
return nil;
}
section = section / 3;
...
}
- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
if (section % 3 != 0) {
return 0;
}
section = section / 3;
...
}
- (CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section
{
if (section % 3 != 2) {
return 0;
}
section = section / 3;
...
}
- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
if (section % 3 != 0) {
return nil;
}
section = section / 3;
...
}
- (UIView *)tableView:(UITableView *)tableView viewForFooterInSection:(NSInteger)section
{
if (section % 3 != 2) {
return nil;
}
section = section / 3;
...
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
int section = indexPath.section;
section = section / 3;
...
}
Swift version of #awulf answer, which works great!
func scrollViewDidScroll(scrollView: UIScrollView) {
let sectionHeight: CGFloat = 80
if scrollView.contentOffset.y <= sectionHeight {
scrollView.contentInset = UIEdgeInsetsMake( -scrollView.contentOffset.y, 0, 0, 0)
}else if scrollView.contentOffset.y >= sectionHeight {
scrollView.contentInset = UIEdgeInsetsMake(-sectionHeight, 0, 0, 0)
}
}
I've learned that just setting the tableHeaderView property does it, i.e. :
tableView.tableHeaderView = customView;
and that's it.
I'm try to emulated something just like the "new message" page in Apple's mail app on the iphone. I've implemented it with a tableview and I've successfully gotten the "To", "CC", and "Subject" rows to behave correctly, but I'm not sure how to implement the actual message portion of the page.
There are several issues that I'm having. I'm currently trying to implement it by placing a UITextView in the cell (I turn off the scroll bars on the text view). I have the text view resize itself when it is changed, by modifying its frame to the new height of the content. The first problem is that I also need to do this for the cell height itself. Since heightForRowAtIndexPath seems to only get called when the row is first loaded, I can't modify the height there. I suppose I could call reload data on the table but this seems like it would be really inefficient to do on the whole table every time text is entered. What is the best way to get the table cell to autoresize as the user types? I've found lots of examples on how to do it on lone table views and how to resize table cells at initialization but I can't find any that let you do both at the same time.
Finally, I would like the bottom border of the table cell to be invisible. If you look at the mail app, you'll notice there is no line at the bottom of the message space, implying that you can just keep typing. I always have one in my table view (even when I add a footer) and I can't figure out how to get rid of it. (Perhaps should I make my message body be the footer itself?)
I would recommend using a UIScrollView yourself instead of a UITableView. UITableView isn't really built to support such a thing.
Mail.app doesn't seem to use UITableView.
It looks like there custom items (labels and text fields) with UITextView on bottom.
You could try my answer to a question similar to this...the key is to use
[self.tableView beginUpdates];
[self.tableView endUpdates];
To do this without reloading the data.
First off, of course, you're going to want to create your UITextView and add it to your cell's contentView. I created an instance variable of UITextView called "cellTextView" Here is the code that I used:
- (UITableViewCell *)tableView:(UITableView *)tableView fileNameCellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:#"Cell"];
if (!cellTextView) {
cellTextView = [[UITextView alloc] initWithFrame:CGRectMake(5.0, 5.0, cell.bounds.size.width - 30.0, cell.bounds.size.height - 10.0)]; // I use these x and y values plus the height value for padding purposes.
}
[cellTextView setBackgroundColor:[UIColor clearColor]];
[cellTextView setScrollEnabled:FALSE];
[cellTextView setFont:[UIFont boldSystemFontOfSize:13.0]];
[cellTextView setDelegate:self];
[cellTextView setTextColor:[UIColor blackColor]];
[cellTextView setContentInset:UIEdgeInsetsZero];
[cell.contentView addSubview:cellTextView];
return cell;
}
Then, create an int variable called numberOfLines and set the variable to 1 in your init method. Afterwards, in your textViewDelegate's textViewDidChange method, use this code:
- (void)textViewDidChange:(UITextView *)textView
{
numberOfLines = (textView.contentSize.height / textView.font.lineHeight) - 1;
float height = 44.0;
height += (textView.font.lineHeight * (numberOfLines - 1));
CGRect textViewFrame = [textView frame];
textViewFrame.size.height = height - 10.0; //The 10 value is to retrieve the same height padding I inputed earlier when I initialized the UITextView
[textView setFrame:textViewFrame];
[self.tableView beginUpdates];
[self.tableView endUpdates];
[cellTextView setContentInset:UIEdgeInsetsZero];
}
Finally, paste this code into your heightForRowAtIndexPath method:
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
float height = 44.0;
if (cellTextView) {
height += (cellTextView.font.lineHeight * (numberOfLines - 1));
}
return height;
}