For UIButton how to pass multiple arguments through #selector [duplicate] - ios

Question

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how to pass argument for gesture selector
(1 answer)
Closed 9 years ago.
I need to pass two actions for single UIButton.
First argument passed successfully asa follows:
[imageButton addTarget:self action:#selector(imageClicked:) forControlEvents:UIControlEventTouchUpInside];
imageButton.tag = 1;
But I need to pass another argument also for the same button:
int secondAction =10;
[imageButton addTarget:self action:#selector(imageClicked:*secondAction) forControlEvents:UIControlEventTouchUpInside];
Can anybody help how to pass two values for a single button/selector?

Answer 1

You can use Objective C Runtime feature for associating data with objects as :
Step 1 : Import this in your class : #import <objc/runtime.h>
step 2 : Crete a key name as : static char * kDataAssociationKey = "associated_data_key";
Step 3 : Associate data with your object (Ex: button) as :
NSString *your_data =#"Data which is being associated";
objc_setAssociatedObject(imageButton,
kDataAssociationKey,
your_data,
OBJC_ASSOCIATION_RETAIN);
Step 4 : Get associated data in your method as :
NSString *value = (NSString *)objc_getAssociatedObject(imageButton, kDataAssociationKey);
Hope it helps you.

Answer 2

One argument that the button can receive is (id)sender. This means you can create a new button, inheriting from UIButton, that allows you to store the other intended arguments. Hopefully these two snippets illustrate what to do.
imageButton.tag = 1;
[imageButton addTarget:self action:#selector(buttonTouchUpInside:) forControlEvents:UIControlEventTouchUpInside];
and
- (IBAction) buttonTouchUpInside:(id)sender {
MyOwnButton *button = (MyOwnButton *)sender; //MyOwnButton inherited from UIButton
or
UIButton *button = (UIButton *) sender;
//do as you please with imageButton.tag
NSLog(#"%d",button.tag);
}
please refer this link for further explanation passing-parameters-on-button-actionselector

Answer 3

Every event has a sender that can be get at selector method by
(void)notify:(NSNotification *)notification {
id notificationSender = [notification object];
//do stuff
}
now this sender is actually an instance whose attributes could be used to get the information about it
now what you can do is you can create a class and add some attribute to it that you want to pass through selector and then use NSNotificationCenter for broad casting your event
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(notify:) name:#"Event" object:yourobjectwithattributes];
put this in the class where you want to recieve the event and have the selector
and
[[NSNotificationCenter defaultCenter] postNotificationName:#"Event" object:notificationSender];
this where you want to throw an event

Answer 4

Short answer: You don't. The #selector there tells the button what method to call when it gets tapped, not the arguments that it should pass to the method.
Longer answer: If you know when you're creating the button what the argument is going to be, then you can wrap it up like this:
// In loadView or viewDidLoad or wherever:
[imageButton addTarget:self action:#selector(imageButtonTapped:) forControlEvents:UIControlEventTouchUpInside];
... later ...
- (void)imageButtonTapped:(id)sender
{
[self doStuffToMyImageWithArgument:10];
}
- (void)doStuffToMyImageWithArgument:(NSInteger)argument
{
... do what you gotta do ...
If you don't know, then you probably want to save the argument to a variable somewhere.
// In your #interface
#property (nonatomic, assign) NSInteger imageStuffArgument;
... later ...
// In loadView or viewDidLoad or wherever:
[imageButton addTarget:self action:#selector(imageButtonTapped:) forControlEvents:UIControlEventTouchUpInside];
... later ...
- (void)respondToWhateverChangesTheArgument
{
self.imageStuffArgument = 10;
}
... later ...
- (void)imageButtonTapped:(id)sender
{
[self doStuffToMyImageWithArgument:self.imageStuffArgument];
}
- (void) doStuffToMyImageWithArgument:(NSInteger)argument
{
... do what you gotta do ...