Is it Possible to Change Action For UIButton? - objective-c

Question

I am trying to change Action For the UIButton in ios applicatio. I did Following Code
button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button addTarget:self action:#selector(aMethodShow:) forControlEvents:UIControlEventTouchDown];
[button setTitle:#"Show View" forState:UIControlStateNormal];
button.frame = CGRectMake(80.0, 210.0, 160.0, 40.0);
[view addSubview:button];
In particular Section I want to change Action for this Button .So i did this
[button addTarget:self action:#selector(aMethodHide:) forControlEvents:UIControlEventTouchDown];
[button setTitle:#"Hide View" forState:UIControlStateNormal];
Unfortunately This code note Working?

Answer 1

I suggest before adding new target, first invoke removeTarget on UIbutton object then add new target with other action.

Answer 2

I think it will help you
[yourButton removeTarget:nil
action:NULL
forControlEvents:UIControlEventAllEvents];
[yourButton addTarget:self
action:#selector(yourAction:)
forControlEvents:UIControlEventTouchUpInside];

Answer 3

You can use same action target instead of using two target. In one target you have to differentiate like below
-(void)btnAction
{
if(target1)
{
// code for target 1
}
else
{
// code for target 2
}
}
Here target1 is BOOL value which value first set to be YES. And change its value NO whenever you want to perform target 2 code.
I hope this will helps You.

Answer 4

I made an app recently and i had the same situation, but i found another way to solve it so i decided to share my solution with people who may be in the same situation.
I'll try to explain what i did with the context of this question:
I added a tag to the button and i associated it with one of the functions that button needs to call (aMethodShow: for example).
button always call the same function (callSpecificFunc: for example). What callSpecificFunc: does is call either function aMethodShow: or aMethodHide according with the current button tag.
In the particular section in which the button needs to call a different function, i only change the tag of button.
Something like this:
NSInteger tagOne = 1000; //tag associated with 'aMethodShow' func
NSInteger tagTwo = 1001; //tag associated with 'aMethodHide' func
button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button addTarget:self action:#selector(callSpecificFunc:) forControlEvents:UIControlEventTouchDown];
[button setTitle:#"Show View" forState:UIControlStateNormal];
button.frame = CGRectMake(80.0, 210.0, 160.0, 40.0);
[view addSubview:button];
...
// in some part of code, if we want to call 'aMethodShow' function,
// we set the button's tag like this
button.tag = tagOne
...
//Now, if we want to call 'aMethodHide', just change the button's tag
button.tag = tagTwo
...
-(void) callSpecificFunc:(UIButton*)sender
{
NSInteger tagOne = 1000;
NSInteger tagTwo = 1001;
if([sender tag] == tagOne){
//do whatever 'aMethodShow' does
}else {
//do whatever 'aMethodHide' does
}
}
Of course it could be applied for more than 2 functions :)