How to pass on string parameter to another method through button selector?

Question

I have this below delegate method that receives stickerURLString as input:

- (void)selectedSticker:(NSString *)stickerURLString {
    //...
        [self.stickerPreviewButton addTarget:self action:@selector(sendStickerPreviewButtonPressed:) forControlEvents:UIControlEventTouchUpInside];
    //...
}

And the selector calls this method sendStickerPreviewButtonPressed :

- (void)sendStickerPreviewButtonPressed: (NSString *)stickerURLString {
    [self.delegate InputFunctionView:self sendSticker:stickerURLString];
}

As you can see in order to make this work as expected I have to pass on stickerURLString from selectedSticker method to sendStickerPreviewButtonPressed .

I have tried this:

[self.stickerPreviewButton performSelector:@selector(sendStickerPreviewButtonPressed:) withObject:stickerURLString];

instead of this:

[self.stickerPreviewButton addTarget:self action:@selector(sendStickerPreviewButtonPressed:) forControlEvents:UIControlEventTouchUpInside];

But I got "terminating with uncaught exception of type NSException" error.

So anyone knows how to pass on string parameter to another method through button selector?

Answer 1

If you are using performSelector to call the function then you can use this variation

• (id)performSelector:(SEL)aSelector withObject:(id)object;

Documentation

https://developer.apple.com/reference/objectivec/1418956-nsobject/1418764-performselector

---

You can also check on this answer where another solution is explained, in my opinion probably more complex but useful

https://stackoverflow.com/a/14161831/1502070

Answer 2

For UIControl object function 1st parameter is id type, passes by control itself , you get uibutton object as a parameter in sendStickerPreviewButtonPressed: function which is not convertible to string , So you got an error, You may pass string By extending UIbutton class by your custom class . then Create button of your own class, anr get you custom property form sender button .

     -(void)sendStickerPreviewButtonPressed:(mycustomButton*)sender{
      //sender.myCustomString
}