Using iOS5. I dragged a UIButton object to inside a custom static cell. Since I am not using dynamic properties I am not using the data source template. The thing is that I am unable to trigger any event when pressing that UIButton inside the cell. I am running the folioing code in my table view controller:
- (void)viewDidLoad
{
[super viewDidLoad];
NSIndexPath *myIP = [NSIndexPath indexPathForRow:1 inSection:1];
UITableViewCell *cell = [medicareTableView cellForRowAtIndexPath:myIP];
UIButton *stepNumberOfChildren = (UIButton *)[cell viewWithTag:222];
[stepNumberOfChildren addTarget:self action:#selector(dontTouchMe:) forControlEvents:UIControlEventTouchUpInside];
}
- (void)dontTouchMe:(id)sender {
NSLog(#"Touched Button %i",((UIButton *)sender).tag);
}
Run the app, press the UIButton and it does not log anything... What am I doing wrong?
Connect your outlet to dontTouchMe function (TouchUpInside)
I hope you want to add the target only to the cell at row=1 and section=1
So code as follows,
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
if(indexpath.row==1&&indexpath.section==1)
{
//add the button target
}
}
Related
This question already has answers here:
How to know the UITableview row number
(10 answers)
Closed 9 years ago.
I have a UITableView for which I have created a custom UITableViewCell. Each row in tableview has a button. I want to know the section number on click of a button, so that I would know that from which section button has been clicked. I have already tried few things found on stack but nothing is working.
UIButton *b = sender;
NSIndexPath *path = [NSIndexPath indexPathForRow:b.tag inSection:0];
NSLog(#"Row %d - Section : %d", path.row, path.section);
Don't know what you've tried, but i might do something like this. Doing some pseudocode from memory, here.
- (void)buttonClicked:(id)sender {
CGPoint buttonOrigin = [sender frame].origin;
// this converts the coordinate system of the origin from the button's superview to the table view's coordinate system.
CGPoint originInTableView = [self.tableView convertPoint:buttonOrigin fromView:[sender superview];
// gets the row corresponding to the converted point
NSIndexPath rowIndexPath = [self.tableView indexPathForRowAtPoint:originInTableView];
NSInteger section = [rowIndexPath section];
}
If I'm thinking clearly, this gives you flexibility in case the button's not directly inside the UITableView cell. Say, if you've nested inside some intermediary view.
Sadly, there doesn't seem to be an iOS equivalent of NSTableView's rowForView:
Create a handler for button click and add it in tableView:cellForRowAtIndexPath: method
- (void)buttonPressed:(UIButton *)button{
UITableViewCell *cell = button.superView.superView;
NSIndexPath *indexPath = [self.tableView indexPathForCell:cell];
//Now you have indexPath of the cell
//do your stuff here
}
When you create your custom UITableViewCell in cellForRowAtIndexPath you should pass it its section as a parameter. It could look like:
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
MyCustomCell *cell = [tableView dequeueReusableCellWithIdentifier:#"MyIdentifier"];
if (!cell)
{
cell = [[[MyCustomCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:#"MyIdentifier" section:indexPath.section] autorelease];
}
return cell;
}
Now your cell knows its section and you can use it when performing click method in MyCustomCell class
Try this,
First assign section as a tag to button also add target on button in cellForRowAtIndexPath method.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
...
[cell.btnSample setTag:indexPath.section];
[cell.btnSample addTarget:self action:#selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];
...
}
Get Section as tag from sender of IBAction you defined (buttonClicked here).
-(IBAction)buttonClicked:(id)sender
{
NSLog(#"Section: %d",[sender tag]);
}
I use UITableview, using IB I defined a UIButton in a custom cell and some labels, The custom cell subclass already have definitions of IBAction of the button and necessary IBOutlets on it, but I want to handle the button click events in the tableview controller it self but not in the custom cell subclass.
How can I do this? also I need to get which row's button is exactly clicked so I will show the content relavant to it.
I solved problem by addding this into my controller;
[cell.expButton setTag:indexPath.row];
UIButton *button = (UIButton *)[cell expButton];
[button addTarget:self action:#selector(buttonTapped:event:) forControlEvents:UIControlEventTouchUpInside];
For the need of clickable event(touch effect on the subView), I usually do this :
-(void)viewDidLoad{
self.tableView.delaysContentTouches = NO;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
// This will do the touch down effect on the subView of your UIButton
for (id obj in cell.subviews)
{
if ([NSStringFromClass([obj class]) isEqualToString:#"UITableViewCellScrollView"])
{
UIScrollView *scroll = (UIScrollView *) obj;
scroll.delaysContentTouches = NO;
break;
}
}
// I need to get which row's button is exactly clicked so I will show the content relavant to it.- here it is
UIButton *btn = (UIButton*)[cell viewWithTag:200];
// btn = cell.myButton; If you are connected with the IBOutlet
[btn setTag:200 + indexPath.row];
[self.btnPlay addTarget:self action:#selector(btnAction:) forControlEvents:UIControlEventTouchUpInside];
}
-(void)btnAction: (id)sender{
UIButton *btn = (UIButton *)sender;
NSLog(#"Selected subView of the Row is %d th tag", btn.tag-200);
// You can get the UITableViewCell using the tag property
selectedIP = [NSIndexPath indexPathForRow:btn.tag - 200 inSection:1;
UITableViewCell *cell = [self.tableView cellForRowAtIndexPath:selectedIP];
// Do the relevant code
}
the way how you want to do this is right (how MVC have to coded clean) - thats beautiful!
To make it more efficent you have to use delegation - thats the best way how to do this!
Here a way how you can do this (e.g. in swift).
https://stackoverflow.com/a/29920564/1415713
I create tow or more custom cell
each cell has a switch inside
How can I know which switch in the row I click
ex.I click the switch in row 3,than It will return indexPath.row = 3
and also the switch status is on or off ?
which void I should put in ?
I know there is a way can get indexpath return by:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
But I don't want to touch the row,just the switch ...
Oh I do some research but it just be a little different
How can keep track of the index path of a button in a tableview cell?
any ideas ?
I wish I can post my screen shot,but not I am a new user
the system doesn't allow me to do this
When you create the switch, set up a target and action for it:
[mySwitch addTarget:self action:#selector(switchToggled:) forControlEvents:UIControlEventValueChanged];
Here, the target self is your UITableViewController, in which you'll need to implement the method (void) switchToggled:(id)sender to handle the control event. The switch will automatically send itself to the switchToggled method as the sender when it is toggled. Like this (modified from the UIButton example you linked):
- (void)switchToggled:(id)sender {
UISwitch *theSwitch = (UISwitch *)sender;
UITableViewCell *cell = (UITableViewCell *)theSwitch.superview;
UITableView *tableView = (UITableView *)cell.superview;
NSIndexPath *indexPath = [tableView indexPathForCell:cell];
if(theSwitch.on) {
// switch turned on
}
else {
// switch turned off
}
}
When button is created
button.tag = [indexPath row]
When button is selected, pull the row out of the tag
int myRow = [(UIButton *)sender tag];
I have a table view where each cell has a button accessory view. The table is managed by a fetched results controller and is frequently reordered. I want to be able to press one of the buttons and obtain the index path of that button's table view cell. I've been trying to get this working for days by storing the row of the button in its tag, but when the table gets reordered, the row becomes incorrect and I keep failing at reordering the tags correctly. Any new ideas on how to keep track of the button's cell's index path?
If you feel uncomfortable relying on button.superview, this method should be a little more robust than some of the other answers here:
UIButton *button = (UIButton *)sender;
CGRect buttonFrame = [button convertRect:button.bounds toView:self.tableView];
NSIndexPath *indexPath = [self.tableView indexPathForRowAtPoint:buttonFrame.origin];
This stopped working with iOS 7; check out Mike Weller's answer instead
- (IBAction)clickedButton:(id)sender {
UIButton *button = (UIButton *)sender;
UITableViewCell *cell = (UITableViewCell *)button.superview;
UITableView *tableView = (UITableView *)cell.superview;
NSIndexPath *indexPath = [tableView indexPathForCell:cell];
}
Or shorter:
- (IBAction)clickedButton:(id)sender {
NSIndexPath *indexPath = [(UITableView *)sender.superview.superview indexPathForCell:(UITableViewCell *)sender.superview];
}
Both are untested!
Crawling up view hierarchies with .superview (like all of the existing answers demonstrate) is a really bad way to do things. If UITableViewCell's structure changes (which has happened before) your app will break. Seeing .superview.superview in your code should set off alarm bells.
The button and its handler should be added to a custom UITableViewCell subclass and layed out there. That's where it belongs.
The cell subclass can then delegate out the button event through a standard delegate interface, or a block. You should aim for something like this:
- (UITableViewCell *)cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
MyCustomCell *cell = ...;
// ...
cell.onButtonTapped = ^{
[self buttonSelectedAtIndexPath:indexPath];
}
// OR
cell.delegate = self;
// ...
}
(Note: if you go the block route, you will need to use a __weak self reference to prevent retain cycles, but I thought that would clutter up the example).
If you take the delegate route you would then have this delegate method to implement:
- (void)cellButtonPressed:(UITableViewCell *)cell
{
NSIndexPath *indexPath = [self.tableView indexPathForCell:cell];
// ...
}
Your code now has full access to the appropriate context when it handles the event.
Implementing this interface on your cell class should be straightforward.
I don't know why I need to call the method superview twice to get the UITableViewCell.
Update:
Thank for Qiulang, now I got it.
"That's because SDK now has added a private class called UITableViewCellContentView for UITableViewCell, which is button's superview now." – Qiulang
UIButton *button = (UIButton *)sender;
UITableViewCell *cell = (UITableViewCell *)button.superview.superview;
UITableView *curTableView = (UITableView *)cell.superview;
NSIndexPath *indexPath = [curTableView indexPathForCell:cell];
I had this same issue also and built a simple recursive method that works no matter how many views deep you triggering control is.
-(NSIndexPath*)GetIndexPathFromSender:(id)sender{
if(!sender) { return nil; }
if([sender isKindOfClass:[UITableViewCell class]])
{
UITableViewCell *cell = sender;
return [self.tableView indexPathForCell:cell];
}
return [self GetIndexPathFromSender:((UIView*)[sender superview])];
}
-(void)ButtonClicked:(id)sender{
NSIndexPath *indexPath = [self GetIndexPathFromSender:sender];
}
I have created one Method for getting indexPath, Hope this will help you.
Create Button Action (aMethod:) in cellForRowAtIndexPath
-(void) aMethod:(UIButton *)sender
{
// Calling Magic Method which will return us indexPath.
NSIndexPath *indexPath = [self getButtonIndexPath:sender];
NSLog(#"IndexPath: %li", indexPath.row);
NSLog(#"IndexRow: %li", indexPath.section);
}
// Here is the Magic Method for getting button's indexPath
-(NSIndexPath *) getButtonIndexPath:(UIButton *) button
{
CGRect buttonFrame = [button convertRect:button.bounds toView:groupTable];
return [groupTable indexPathForRowAtPoint:buttonFrame.origin];
}
Use this Perfect working for me.
CGPoint center= [sender center];
CGPoint rootViewPoint = [[sender superview] convertPoint:center toView:_tableView1];
NSIndexPath *indexPath = [_tableView1 indexPathForRowAtPoint:rootViewPoint];
NSLog(#"%#",indexPath);
SWIFT 2 UPDATE
Here's how to find out which button was tapped
#IBAction func yourButton(sender: AnyObject) {
var position: CGPoint = sender.convertPoint(CGPointZero, toView: self.tableView)
let indexPath = self.tableView.indexPathForRowAtPoint(position)
let cell: UITableViewCell = tableView.cellForRowAtIndexPath(indexPath!)! as
UITableViewCell
print(indexPath?.row)
print("Tap tap tap tap")
}
I created a tableViewCell the include an image, two text labels and a uibutton.
The button is allocated to an action method (e.g. viewButtonPused:sender).
I'm used to handle row selection with tableView:didSelectRowAtIndexPath: so I could tell which row was selected. But with the uibutton and its action method .... How can I tell?
Thanks in advance.
If the button's target is the UIViewController/UITableViewController or any other object that maintains a reference to the UITableView instance, this will do nicely:
- (void)viewButtonPushed:(id)sender {
UIButton *button = (UIButton *)sender;
UITableViewCell *cell = button.superview; // adjust according to your UITableViewCell-subclass' view hierarchy
NSIndexPath *indexPath = [self.tableView indexPathForCell:cell];
// use your NSIndexPath here
}
Using this approach will let you avoid extra instance variables and will work fine in case you have multiple sections. You need to have a way to access the UITableView instance though.
Edit: as someone pointed out in the comments below, this approach broke in iOS 7. If you're still interested in using this approach over tags, be sure to find the UITableViewCell instance correctly, i.e. by looping through the superviews until you find one.
Define a delegate on the class associated with the Cell's prototype.
// MyCell.h
#protocol MyCellDelegate
- (void)buttonTappedOnCell:(MyCell *)cell;
#end
#interface MyCell : UITableViewCell
#property (nonatomic, weak) id <MyCellDelegate> delegate;
#end
// MyCell.m
#implementation MyCell
- (void)buttonTapped:(id)sender {
[self.delegate buttonTappedOnCell:self];
}
}
#end
Now go to the class you want to make the Cell's delegate. This is probably going to be a UITableView subclass. In the cellForRowAtIndexPath method make sure you assign the delegate of the Cell to self. Then implement the method specified in the protocol.
- (void)buttonTappedOnCell:(MyCell *)cell {
NSIndexPath *indexPath = [self.tableView indexPathForCell:cell];
int row = indexPath.row;
}
Or if you would prefer a blocks based approach:
// MyCell.h
typdef void(^CellButtonTappedBlock)(MyCell *cell);
#interface MyCell : UITableViewCell
#property (nonatomic, copy) CellButtonTappedBlock buttonTappedBlock;
#end
Then in your tableView's dataSource:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
MyCell *cell = ....
__weak typeof(self) weakSelf = self;
[cell setButtonTappedBlock:^(MyCell *cell) {
NSIndexPath *indexPath = [weakSelf.tableView indexPathForCell:cell];
// Do stuff with the indexPath
}];
}
I know this is an old thread but I find this method best as it is free from superView calls (and thus when Apple change the view hierarchy with new os versions it is left unaffected) and doesn't require subclassing or use of cumbersome tags that can get messed up when the cell is reused.
- (void)buttonPressed:(UIButton *)sender {
CGPoint location = [sender convertPoint:sender.center toView:self.tableView];
NSIndexPath *indexPath = [self.tableView indexPathForRowAtPoint:location];
NSLog(#"%#", indexPath);
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
...
[cell.customCellButton addTarget:self action:#selector(customCellButtonTapped:) forControlEvents:UIControlEventTouchUpInside];
[cell.customCellButton setTag:indexPath.row];
}
- (void)customCellButtonTapped:(id)sender {
UIButton *button = (UIButton *)sender;
NSLog(#"indexPath.row: %d", button.tag);
}
If you have directly added elements on the cell itself (which you shouldnt) -
NSIndexPath *indexPath = [self.tableView indexPathForCell:(UITableViewCell *)[sender superview] ];
If you have added elements on the contentView of the cell (which is the proposed way)
NSIndexPath *indexPath = [self.tableView indexPathForCell:(UITableViewCell *)[[sender superview] superview] ];
define one class variable int SelectedRow; inside didSelectRowAtIndexPath assign value to it like
SelectedRow = indexPath.row;
use this SelectedRow variable in side your action method viewButtonPused:sender
Instead of adding the button as a subview of the cell set it to be cell.accessoryView.
Then use tableView:accessoryButtonTappedForRowWithIndexPath: to do your stuff that should be done when a user taps this button.
Another way that I use now is to subclass UIButton and add a property of type NSIndexPath.
On cellForRowAtIndexPath I assign the value of indexPath and its available at the action method.