I have a huge crazy scene in my story board that has 36 different buttons, and each one means something different when clicked on. I really don't want to go about creating 36 different methods, so how could I reference a button title or button name in a method that is called when one of the 36 buttons is pushed.
This is probably a simple question, but I'm new to iOS and Objective C...
Thanks!
You can create a single method, like so:
- (IBAction)buttonTapped:(id)sender{
// The button that was tapped is called "sender"
// This will log out the title of the button
//NSLog(#"Button: %#", sender.titleLabel.text);
//Edit: You need a cast in the above line of code:
NSLog(#"Button: %#", ((UIButton *)sender).titleLabel.text);
}
Then, you can use Interface Builder to connect to all of the buttons. You can have some sort of if/else logic to test which button was tapped.
You can check the titleLabel property, or you can assign an IBOutlet to each button and check for that.
For example:
if([sender isEqual:buttonOutlet1]){
//If this button is attached to buttonOutlet1
//do something
}
Alternatively, you can simply use the label of each button, not worrying about outlets.
A third option would be to generate and lay out the buttons in code, and then access them as elements of an array of buttons.
A fourth option would be to add tags to the buttons and check for the button's tag in your function.
Give each button a unique tag value. in the IBAction, sender.tag tells you which button was tapped.
The IBAction routine you set up to handle the button presses has a sender parameter. Examine that to decide.
-(IBAction) buttonPress: (id) sender {
UIButton *pressedButton = (UIButton *)sender;
NSString *buttonTitle = [pressedButton currentTitle];
if ([buttonTitle isEqualToString: #"SomeTitle"]) {
//do work for that button.
}
}
You can use a variety of NSString methods to compare or filter which button was pressed and handle it through if's or switches.
That's quite simple, but since you're new, here's an answer.
(According to Stanford cs193p course, 2010-2011 fall (that's what they did with the calculator app)) make a method that receives an argument, which is the UIButton.
for example:
- (IBAction) someMethodThatDoesSomething:(UIButton *)sender;
Then make if statements according to the sender.titleLabel.text
I don't know if there are any other solutions. Hope this helps!
-(IBAction)myButtonAction:(id)sender {
if ([sender tag] == 0) {
// do something here
}
if ([sender tag] == 1) {
// Do some think here
}
}
// in Other words
-(IBAction)myButtonAction:(id)sender {
NSLog(#"Button Tag is : %i",[sender tag]);
switch ([sender tag]) {
case 0:
// Do some think here
break;
case 1:
// Do some think here
break;
default:
NSLog(#"Default Message here");
break;
}
Related
I've got a UIButton that acts as a switch.
When user taps on it, its state changes to "selected" and action "one" is called. When user taps again UIButton state changes to "not selected" and the action is no longer available.
Is there a way to set the UIButton to "selected" by taping on a completely different UIButton and have it change to "selected" and call the same action as well?
Cheers
From what I have understood from the question, I would like to give you my suggestion
if (!<your_button>.selected)
{
<your_button>.selected = YES;
// do your stuff here
}
else
{
<your_button>.selected = NO;
// do your stuff here, in your case action should be no longer available so that,
<your_button>.userInteractionEnabled = NO;
}
Enjoy Programming !
try like this,'
-(IBAction)nextbutton:(id)sender{
UIButton *btn=(UIButton *)[self.view viewWithTag:tagValue];//pass tag value of that particuler button
btn.selected=YES;
//do whatevr you want.
}
simple thing when you tap on the uibutton make an action for that and in the action for that button , you can set the button state to selected and then in the next line of code you can call that method (action)
- (IBAction)btn1Touched:(id)sender {
[_btn2 setSelected:YES];
[self btn2Touched:self];
}
- (IBAction)btn2Touched:(id)sender {
NSLog(#"btn Action called");
}
UIbutton has state called selected and it is managed via property selected
so to make a button to selected state
[buttonInstance setSelected:YES];
To make it unselected use
[buttonInstance setSelected:NO];
Kindly write a function for that button action like,
-(void)Buttonaction
{
do your action here
also set your button has selected state.
buttonname.setselected=yes;
}
call this function while you are tabbing your button.
Do This:
-(IBAction)switchButtonClicked:(UIButton*)sender
{
if(sender.isSelected)
{
.....
}
else
{
...
}
[sender setSelected:!sender.isSelected];//This will work as Switch.
}
set Selected(Switch ON) and default(Switch OFF) property (image and title) of UIButton from XIB, OR from Code as you want.
With a single button you can do you functionality with this code
I am developing for iPhone the app I am developing has many buttons and I want all buttons to call the same class but with different parameter
for example I want button1 to call the displayimageclass
and button2 should call the same class displayimageclass so, how to different method call same class and in that same class how to fetch different button from where it is call to particular class.
That is pretty much standard. Just define as many IBAction methods as you need.
In the viewController's .h file:
- (IBAction)actionButton1:(UIButton *)sender;
- (IBAction)actionButton2:(UIButton *)sender;
- (IBAction)actionButton3:(UIButton *)sender;
And in its .m file:
{
//react here to button1 pressed
}
- (IBAction)actionButton1:(UIButton *)sender
{
//react here to button1 pressed
}
- (IBAction)actionButton2:(UIButton *)sender
{
//react here to button2 pressed
}
- (IBAction)actionButton3:(UIButton *)sender
{
//react here to button3 pressed
}
Then associate the action with the Button's events (TouchUpInside would be most appropriate, I guess).
You should add tag property to your buttons.
Suppose your buttons are
button1.tag =1;
button2.tag =2;
button3.tag =3;
When you click any button, NSLog shows related button tag number. i.e You will get your result what you want.
- (IBAction)buttonClicked:(id)sender {
UIButton* button = (UIButton *)sender;
NSLog(#"The number of tag:%d",button.tag);
}
I think it will be helpful to you.
you can implement your action method like this:
- (IBAction)action:(UIButton *)sender
{
//sender will be different for different button
}
Set tag value for buttons and get those buttons like
- (IBAction)action:(UIButton *)sender
{
UIButton *btn = (UIButton*)sender;
}
Are you looking for
1) several buttons performing the same method with the same behavior
2) several buttons performing the same method but having different behavior based on the button characteristics
3) each button performing its own method.
1) You can register several buttons on the same IBAction, they all will call it and perform the same code
2) In the method were all the buttons are registered (cf: 1) it is possible to sort the buttons by subclassing the UIButton class, giving an enum value that represents what the button should perform and then in the called method check the enum value with a switch in order to trigger the wanted behavior
The UIBarButtonItem already has this tag property so you could use them by giving a value to each of your UIBarButtonItem in the Interface Builder and set them to call the following method
- (IBAction) myButtonsMethod:(id)object
if ([object isKindOfClass:[UIBarButtonItem class]])
{
switch ([(UIBarButtonItem *)object tag])
{
case myFirstTagValue
...
}
3) #Hermann Klecker solution is the right one.
I have a custom UITableViewCell subclass that gets presented in a UITableView in a UIPopoverController. The UIPopoverController is presented from a UIBarButtonItem.
When selections in the UITableViewCell are made, I send a NSNotification to the UIViewController class that is presenting the UIPopoverController. The selections in the table update my view in my viewController.
Now, there is a requirement to have another UIBarButtonItem that does EXACTLY the same thing as one of the buttons in the UITableViewCell in the popover. Basically the use case is that this feature seems to be the most commonly used feature in our popover and they want an easy way to just turn it on and off from another button.
So what I did was create a new UIBarButtonItem, and have a target attached to it:
- (void)FilterOn:(id)sender {
isFilterOn = !isFilterOn;
if ([sender isKindOfClass:[UIBarButtonItem class]]) {
UIBarButtonItem *filter = (UIBarButtonItem *)sender;
if (isFilterOn) {
[filter setTitle:#"Filter On"];
[self DoFilter];
}
else {
[aboutMeBBI setTitle:#"Filter Off"];
[self ClearFilter];
}
}
}
So this part works. It updates the model, the title of the button changes. The problem is, let's say I turn filter on, then in the popover, I turn the filter off. I pass the notification to my viewController class to its normal update method that handles filtering and a bunch of other stuff. I added this simple snippet to when the filter button is pressed from the popover:
- (void)FilterSortOptionDidSelect:(NSNotification *)notification {
NSDictionary *userDict = [notification userInfo];
NSInteger theTag = [[userDict objectForKey:#"CellTag"] integerValue];
switch (theTag) {
case FILTER: {
// update Model
[self.FilterBarButtonItem setTitle:#"Filter off"];
}
break;
default:
break;
}
}
This isn't quite what I want though since if I click back on the filter button since for starters, if I click back on the Filter button, it'll still say Filter Off, and do the action for Filter Off, and then if I click it again, it'll do Filter on actions. I try to fake it in the switch statement by changing the title, but that isn't really what I want to do. I read a little about key value observing and I wasn't sure if I could use something like that here, to register my buttons state with that of a button in a UITableViewCell subclass in a UIPopoverController. If anyone has any ideas that would be great. Thanks.
I'm trying to use a switch statement to read out what button has been clicked in a UIActionSheet (programming for iPhone).
The following is in my FirstViewController.m:
- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
int countarray=[areaselectArray count];
switch (buttonIndex) {
case countarray: //cancel button has been pressed
//do stuff
break;
default:
area = [areaselectArray objectAtIndex:(buttonIndex)];
[[NSUserDefaults standardUserDefaults] setObject:area forKey:#"mulValue"];
[areaselectArray release];
NSLog(#"Released areaselectArray");
break;
}
}
The buttons for the UIActionSheet are built from an array that I built earlier (and have not yet released). I'm placing my Cancel button at the end of the list by using
int countarray=[areaselectArray count];
[areaselect.cancelButtonIndex = countarray;]
earlier on when allocating my UIActionSheet. Since the amount of buttons changes depending on the amount of entries in the array, I'd like the "Cancel" button to simply dismiss the UIActionSheet, but in all other instances have the Switch statement write the value of the clicked button to "mulValue" in standardUserDefaults.
Is there any way to do this? My main issue right now of course is that a switch function won't take a variable (like countarray in my example). Is there any way to write the value to a constant (?) before entering the switch statement?
Thanks in advance!
Why don't you use if-statement instead of switch-statement? You can use cancelButtonIndex property for detecting pressing cancel button.
if (buttonIndex == actionSheet.cancelButtonIndex) {
// cancel button has been pressed
// do stuff
}
Also, you are able to use title string for comparison of buttons. However, button titles might be localized. Be careful.
NSString *buttonTitle = [actionSheet buttonTitleAtIndex:buttonIndex];
if ([buttonTitle isEqualToString:#"Cancel"]) {
// cancel button has been pressed
// do stuff
} else {
//
}
As you've discovered, only a constant can follow 'case'. The values with which a variable will be compared in a switch statement must be known at compile time.
To gain the functionality you desire, use an if/else construct. Simple as that. ;)
edit:
And, no, this will not compile (due to what I mentioned previously):
int n = 4;
const int a = someVariable;
switch (n) {
case a:
printf("hi");
break;
}
can I assign same action to multiple buttons in the Interface Builder once they are all selected by one connection?
This problem is discussed in numerous threads but it isn't always just laid out simply. The easiest route is to create a function such as the one below. It takes the sender, in this case a UIButton, and gets the tag. You can then run whatever code you want based on that.
- (IBAction) buttonClick: (id) sender {
UIButton *button = (UIButton *)sender;
int row = button.tag;
NSLog(#"Button clicked: %i", row);
if (row == 1 ) {
// do something
}
}
In Interface Builder, attach the button to the function, and then use the Attributes Inspector to set the Tag value for each button, giving each one a different integer value.