如何将选择器（SEL）与objc_setAssociatedObject一起使用？

Question

Can I use somehow parameter of type SEL with objc_setAssociatedObject without converting it to NSString type?

Currently I'm using this code: objc_setAssociatedObject(thirdPartyObject, &kSelectorKey, NSStringFromSelector(selector), OBJC_ASSOCIATION_RETAIN);

Conversion to NSString works, but in feels wrong. There must be more appropriate solution.

Answer 1

OBJC_EXPORT void objc_setAssociatedObject(id object, const void *key, id value, objc_AssociationPolicy policy)

The 3rd parameter needs to be an object type. So, yes, you need that conversion.

Answer 2

Try This.
In my example i have passed indexpath you have to replace with your para meter

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    yourCustomeCell *aCell;
    NSString *aStrIdentifier = @"yourIdentiFier";
    aCell = (yourCustomeCell *)[tableView dequeueReusableCellWithIdentifier:aStrIdentifier];

    //you have to set your indexpath
    objc_setAssociatedObject(aCell.btnUpload_or_Add, @"objBtn", indexPath, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
    [aCell.YourButton addTarget:self action:@selector(yourButtonActiontapped:) forControlEvents:UIControlEventTouchUpInside];

    return aCell;
}

-(IBAction)yourButtonActiontapped:(UIButton *)sender{

    NSIndexPath *aIndPath =  objc_getAssociatedObject(sender, @"objBtn");
    NSLog(@"row:%@",aIndPath.row);
}

also you have to import #import <objc/runtime.h>