I have a form with five different UIbutton instances. When I push one, I have to show different options, so my problem is, How can I know which button I have pushed using the same UIView? I don't want to create five UIViews. Is it possible give an ID to the buttons?
You can assign a tag to each UIButton in this manner :
[button setTag:4]
or you can set it in Interface Builder in the View attributes of the UIButton.
Then in your IBAction :
- (IBAction)message:(id)sender
{
int currentSender = [sender tag];
switch(currentSender) {
// Different actions
}
}
As #Florent pointed out, you can use a tag. But even this complication is not needed - you can directly compare the button objects themselves.
- (void)buttonClicked:(UIButton *)sender
{
if (sender == button1) {
// button 1 clicked
} else if (sender == button2) {
// etc.
}
}
Try this...
(IBAction)nextHipoacusia:(id)sender
{
int currentSender = ((UIButton *)sender).tag;
}
Related
I have a window with a Source List (NSOutlineView). My source list has just two levels. Level one is header and level two is data. I want to have a contextual menu on some of the data cells. Not all.
First, I try to attach a menu on the table cell view who represents the data cell -> nothing happens.
Second, I attach a menu on the Outline View in IB -> the contextual menu opens on each cells (header and data). I search for stopping the opening of the menu, but I don't find anything.
Do you have some ideas ?
Thank you
OS X 10.8.2 Lion, Xcode 4.5.2, SDK 10.8
If you subclass NSOutlineView, you can override menuForEvent: to return a menu only if the user clicked on the correct row. Here's an example:
- (NSMenu *)menuForEvent:(NSEvent *)event;
{
//The event has the mouse location in window space; convert it to our (the outline view's) space so we can find which row the user clicked on.
NSPoint point = [self convertPoint:[event locationInWindow] fromView:nil];
NSInteger row = [self rowAtPoint:point];
//If the user did not click on a row, or is not exactly one level down from the top level of hierarchy, return nil—that is, no menu.
if ( row == -1 || [self levelForRow:row] != 1 )
return nil;
//Create and populate a menu.
NSMenu *menu = [[NSMenu alloc] init];
NSMenuItem *delete = [menu addItemWithTitle:NSLocalizedString( #"Delete", #"" ) action:#selector(delete:) keyEquivalent:#""];
[self selectRowIndexes:[NSIndexSet indexSetWithIndex:row] byExtendingSelection:NO];
//Set the Delete menu item's represented object to the clicked-on item. If the user chooses this item, we'll retrieve its represented object so we know what to delete.
[delete setRepresentedObject:[self itemAtRow:row]];
return menu;
}
This assumes we're compiling with ARC, so you don't need to autorelease the menu object being created.
This extension + subclass (both NSOutlineView and NSTableView) does the sensible thing of seeing whether a menu is attached to a cell view or row view. Just a general, reusable subclass!
Set the menu on the cell view in outlineView:viewForTableColumn:item: – menu is a NSResponder property.
(Below is in Swift)
// An extension lets us both subclass NSTableView and NSOutlineView with the same functionality
extension NSTableView {
// Find a cell view, or a row view, that has a menu. (e.g. NSResponder’s menu: NSMenu?)
func burnt_menuForEventFromCellOrRowViews(event: NSEvent) -> NSMenu? {
let point = convertPoint(event.locationInWindow, fromView: nil)
let row = rowAtPoint(point)
if row != -1 {
if let rowView = rowViewAtRow(row, makeIfNecessary: true) as? NSTableRowView {
let column = columnAtPoint(point)
if column != -1 {
if let cellView = rowView.viewAtColumn(column) as? NSTableCellView {
if let cellMenu = cellView.menuForEvent(event) {
return cellMenu
}
}
}
if let rowMenu = rowView.menuForEvent(event) {
return rowMenu
}
}
}
return nil
}
}
class OutlineView: NSOutlineView {
override func menuForEvent(event: NSEvent) -> NSMenu? {
// Because of weird NSTableView/NSOutlineView behaviour, must set receiver’s menu otherwise the target cannot be found
self.menu = burnt_menuForEventFromCellOrRowViews(event)
return super.menuForEvent(event)
}
}
class TableView: NSTableView {
override func menuForEvent(event: NSEvent) -> NSMenu? {
// Because of weird NSTableView/NSOutlineView behaviour, must set receiver’s menu otherwise the target cannot be found
self.menu = burnt_menuForEventFromCellOrRowViews(event)
return super.menuForEvent(event)
}
}
It's not clear from your question whether your outline is view based or cell based. That's important.
If you're view based, then your view instances can implement
- (NSMenu *)menuForEvent:(NSEvent *)theEvent
and return the menu appropriate to that item -- or nil f you don't want a menu at all.
If you're cell based, or if you don't want to handle this in the view class for some reason, you'll need to subclass NSOutlineView and implement - (NSMenu *)menuForEvent:(NSEvent *)theEvent there. Again, you'll figure out which cell is hit or active, and decide from that what menu you want.
- (void)rightMouseDown:(NSEvent *)event
An NSView will not pass this to the next view, This method looks to see that the current class has a menuForEvent:, if it does then it is called. If it does not then it is finished and nothing else will happen. This is why you will not see an NSTableCellView respond to a menuForEvent: because the table view swallows the rightMouseDown:.
You may subclass the tableview and handle the rightMouseDown: event and call the NSTableCellView's rightMouseDown: and handle displaying your menu that you have constructed in your storyboard and hooked up to your NSTableViewCell.
Here is my solution in a subclassed NSTableView:
- (void)rightMouseDown:(NSEvent *)event
{
for (NSTableRowView *rowView in self.subviews) {
for (NSView *tableCellView in [rowView subviews]) {
if (tableCellView) {
NSPoint eventPoint = [event locationInWindow];
// NSLog(#"Window Point: %#", NSStringFromPoint(eventPoint));
eventPoint = [self convertPoint:eventPoint toView:nil];
eventPoint = [self convertPoint:eventPoint toView:self];
// NSLog(#"Table View Point: %#", NSStringFromPoint(eventPoint));
NSRect newRect = [tableCellView convertRect:[tableCellView bounds] toView:self];
// NSLog(#"Rect: %#", NSStringFromRect(newRect));
BOOL rightMouseDownInTableCellView = [tableCellView mouse:eventPoint inRect:newRect];
// NSLog(#"Mouse in view: %hhd", mouseInView);
if (rightMouseDownInTableCellView) {
if (tableCellView) {
// Lets be safe and make sure that the object is going to respond.
if ([tableCellView respondsToSelector:#selector(rightMouseDown:)]) {
[tableCellView rightMouseDown:event];
}
}
}
}
}
}
}
This will find where the right mouse event occurred, check to see if we have the correct view and pass the rightMouseDown: to that view.
Please let me know if this solution works for you.
Say I have a switch and a small table view(no scroll) below it. I know if the switch is turned on/off using a bool switchState whose value get changed in the action method of the switch:
-(IBAction)switchSlide:(id)sender{
if (toggleSwitch.on == YES) {
switchState = YES;
}
else{
switchState = NO;
}
}
Now what I want is that the table view below it should hide when the switchState == NO. How do I do that?
Every UIView has a property hidden:
#property(nonatomic, getter=isHidden) BOOL hidden
since a UITableView is a sublass of UIView you can use the methods from a UIView too.
So your code just need a little adjustment (assuming you are calling this IBAction in a UITableViewController):
-(IBAction)switchSlide:(id)sender{
if (toggleSwitch.on == YES) {
switchState = YES;
self.tableView.hidden = NO;
}
else{
switchState = NO;
self.tableView.hidden = YES;
}
}
Edit:
Solved this via chat and the solution is:
Since you used a UIViewController you have to make a propert for the UITableView. synthesize it and connect the outlet by dragging from the files owner to the UITableView in the interface builder. Now you can use the code above.
I have an NSDictionary that holds all the data:
One title (not important for this question)
One link (not important for this question)
One array of NSDictionary containing again 1 title and 1 link
I'm displaying this data in a view based table view like this:
- (NSInteger)numberOfRowsInTableView:(NSTableView *)tv
{
if (tv == _downloadTable)
//I use this "if" because I have another tableView that has nothing to do
//with this one
{
return [[myDictionary objectForKey:#"myArray"] count];
}
}
I want 2 columns in this tableView, one to display the title and one with a checkbox, that would do something letting me know which row is checked.
- (NSView *)tableView:(NSTableView *)tv viewForTableColumn :(NSTableColumn *)tableColumn row :(NSInteger)row
{
if (tv == _downloadTable)
{
if (tableColumn == _downloadTableTitleColumn)
{
if ([[[myDictionary objectForKey:#"myArray"]objectAtIndex:row]objectForKey:#"title"])
{
NSString *title = [[[myDictionary objectForKey:#"myArray"]objectAtIndex:row]objectForKey:#"title"];
NSTableCellView *result = [tv makeViewWithIdentifier:tableColumn.identifier owner:self];
result.textField.stringValue = title;
return result;
}
}
if (tableColumn == _downloadTableCheckColumn)
{
NSLog(#"CheckBox"); //I wanted to see exactly when that was called
//But it didn't help me :(
NSButton *button = [[NSButton alloc]init];
[button setButtonType:NSSwitchButton];
[button setTitle:#""];
return button;
}
}
}
Right now when I run it and click on the checkbox it does nothing
(of course because I don't know how to make it do something.
Where should I put the code that should do something?
The main goal is an editable list of downloads, right now the list is displayed, with the checkbox right next to the title at each lines.
I would like to know which checkBox are checked and which are not.
I tried this:
[button setAction:#selector(checkBoxAction:)];
- (void)checkBoxAction: (id)sender
{
NSLog(#"I am button : %# and my state is %ld", sender, (long)[sender state]);
}
But I can't figure out how to get the row of that button, to know which title is associated with this checkBox.
I also tried the setObjectValue method of the tableView without success.
The way I would like it to work is:
I have a "start downloading" button that check if each checkbox is checked or not and launch the next action (downloading) only with the checked row.
I would like to avoid bindings because I plan to make it work on iOS too and I don't want to have different code for iOS.
You can use the NSTableView method -rowForView: to get the row a particular view is in.
In your case you'd have something like this:
- (void)checkBoxAction:(id)sender
{
NSInteger row = [_downloadTable rowForView:sender];
NSLog(#"The button at row %ld was clicked.", row);
}
Here are the docs for NSTableView: https://developer.apple.com/library/mac/#documentation/Cocoa/Reference/ApplicationKit/Classes/NSTableView_Class/Reference/Reference.html
You could try using the button' tag property setting it for each button you place as the number (location) in the tableview. Look here!!!
Detecting which UIButton was pressed in a UITableView
[EDIT1]
If people actually decided to read the linked post you would realize that the answer is actually there.
Try adding:
[button setTag:row];
[button addTarget:self action:#selector(checkBoxAction:) forControlEvents:UIControlEventTouchUpInside];
inside the else of your viewForTableColumn routine:
In your checkBoxAction routine:
- (void)checkBoxAction: (id)sender{
NSLog(#"I am button : %# and my state is %#", sender.tag, [sender state]);
}
I also think that once you begin digging further into your code, you are going to want to start using the auto-dequeuing capability of the TableViewCell objects. I believe that you are going to find yourself in a memory alloc/dealloc problem.
I'm having an issue with multiple UIButtons in a view. I'd like the buttons to be selected individually, with multiple selected at a time (example: 10 buttons, with buttons 1, 4, 5, 9 selected).
In my header I have a property for the IBOutletCollection:
#property (retain, nonatomic) IBOutletCollection(UIButton) NSMutableArray *buttonToStaySelected;
In my implementation, I have an IBAction:
-(IBAction)selectedButton:(id)sender{
for (UIButton *b in self.buttonToStaySelected) {
if (b.isSelected == 0){
[b setSelected:YES];
} else
[b setSelected:NO];
}
}
The issue I'm having is when I select any of the buttons tied to the collection, they all change to selected. I know the problem most likely (almost certain) lies in the loop, but every condition I've tried to stipulate breaks the code and leaves none of the buttons able to "change" state.
UPDATED
To have them selectable, change state and check off multiple, I used this as my final code:
-(IBAction)selectedButton:(id)sender {
for (UIButton *b in self.buttonToStaySelected) {
if (sender == b) {
[b setSelected:!b.isSelected];
}
}
}
Thanks for all the help!
The selectButton: message is sent with an argument which specifies the button that was tapped, but you apply the action to all buttons in the collection, not just the button that was tapped.
-(IBAction)selectedButton:(id)sender
{
for (UIButton *b in self.buttonToStaySelected)
{
if (sender == b)
{
b.isSelected == !b.isSelected
}
}
}
I have an iPad application which has a sign up form within it. The form is very basic and contains only two UITextFields which are for Name & Email address.
The first TextField is for the candidates Name, When they enter their name in and press 'Next' on the keyboard I want this to automatically move to the next Email Address TextField to editing.
Any idea how I can set the next button the keyboard to jump to the next keyboard?
Thanks
You need to make your view controller the UITextField delegate, and implement the UITextField delegate method:
- (BOOL)textFieldShouldReturn:(UITextField *)textField {
if (textField == nameField) {
[textField resignFirstResponder];
[emailField becomeFirstResponder];
} else if (textField == emailField) {
// here you can define what happens
// when user presses return on the email field
}
return YES;
}
Swift version:
func textFieldShouldReturn(textField: UITextField) -> Bool {
if textField == nameField {
textField.resignFirstResponder()
emailField.becomeFirstResponder()
} else if textField == emailField {
// here you can define what happens
// when user presses return on the email field
}
return true
}
You may also want to scroll your view for the emailField to become visible. If your view controller is an instance of UITableViewController, this should happen automatically. If not, you should read this Apple document, especially Moving Content That Is Located Under the Keyboard part.
Additionally to #lawicko 's answer I often change the button text to give that final finishing touch (e.g. says next when there are more fields and then done when on the last):
- (void)textFieldDidBeginEditing:(UITextField *)textField
{
BOOL isLastTextField = //.. your logic to figure out if the current text field is the last
if (isLastTextField) {
textField.returnKeyType = UIReturnKeyDone;
} else {
textField.returnKeyType = UIReturnKeyNext;
}
}
Swift version of correct answer.
In my experience, you do not need to resignFirstResponder when switching textFields.
In this example, it's just your basic username and password textFields.
The keyboard "return key" in storyboard for username is set to "Next" and the one for password is set to "Done".
Then just connect the delegates for these two text fields and add this extension and you're pretty much done.
extension LoginViewController: UITextFieldDelegate {
func textFieldShouldReturn(textField: UITextField) -> Bool {
if textField == textFieldPassword {
self.view.endEditing(true)
} else {
textFieldPassword.becomeFirstResponder()
}
return true
}
}
A more consistent and robust way is to use NextResponderTextField
You can configure it totally from interface builder.
All you need to do is
Set the class type of your UITextField to be NextResponderTextField
Then set the outlet of the nextResponderField to point to the next responder it can be anything UITextField or any UIResponder subclass. It can be also a UIButton and the library is smart enough to trigger the TouchUpInside event of the button only if it's enabled.
Here is the library in action:
A Swift 4 extension. Just pass the array of UITextFields and it will connect each one to the next until the last one which resigns the first responder (hides the keyboard):
extension UITextField {
class func connectFields(fields: [UITextField]) {
guard let last = fields.last else { return }
// To reset the targets in case you call this method again to change the connected fields
fields.forEach { $0.removeTarget(nil, action: nil, for: .editingDidEndOnExit) }
for i in 0 ..< fields.count - 1 {
fields[i].returnKeyType = .next
fields[i].addTarget(fields[i + 1], action: #selector(UIResponder.becomeFirstResponder), for: .editingDidEndOnExit)
}
last.returnKeyType = .continue
last.addTarget(last, action: #selector(UIResponder.resignFirstResponder), for: .editingDidEndOnExit)
}
}
- (BOOL) textFieldShouldReturn:(UITextField *)textField
{
if (textField == self.textFieldName)
{
[self.textFieldName resignFirstResponder];
[self.textFieldPassword becomeFirstResponder];
}
else if (textField == self.textFieldPassword)
{
[self.textFieldPassword resignFirstResponder];
[self login:self];
}
return true;
}
#interface MLLoginViewController ()<UITextFieldDelegate>
#end
#implementation MLLoginViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.textFieldName.delegate = self;
self.textFieldPassword.delegate = self;
Make an outlet for the textfield, then
viewController.h
(IBAction)textFieldDoneEditing:(id)sender;
viewController.m
(IBAction)textFieldDoneEditing:(id)sender {
[textField resignFirstResponder];
if (textField == nameField) {
[emailField becomeFirstResponder];
}
}
Make the relation between (show the connections inspector > Sent Events)didEndOnExit and textFieldDoneEditing