How do I call a method from a UIbutton selector? - iphone

Question

How do I call this method from the button selector code I have below:
- (void)displayEditorForImage:(UIImage *)imageToEdit
{
AFPhotoEditorController *editorController = [[AFPhotoEditorController alloc] initWithImage:imageToEdit];
[editorController setDelegate:self];
[self presentViewController:editorController animated:YES completion:nil];
}
here's the UIButton I'm trying to call the method with:
//edit button
UIButton *editButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[editButton addTarget:self
action:#selector(editBtnTouch)
forControlEvents:UIControlEventTouchDown];
[editButton setTitle:#"Effects" forState:UIControlStateNormal];
**// the following line shows the selector where I'm unsure how to call the method from the code above**
if ([[UIScreen mainScreen] respondsToSelector:#selector(displayEditorForImage:)] &&
([UIScreen mainScreen].scale == 2.0)) {
// Retina display
editButton.frame = CGRectMake(220.0, 320.0, 60.0, 40.0);
} else {
editButton.frame = CGRectMake(220.0, 315.0, 60.0, 40.0);
}
[self.view addSubview:editButton];
thanks for the help

Answer 1

When the selector you add to the button is called, the button itself will be passed as the first argument if the selector allows for one. In order to get a reference to your image, you would either need to do this (assuming the image you want is the background image for the button):
- (void)displayEditorForImage:(UIButton*)sender {
UIImage* imageToEdit = [sender backgroundImageForState:UIControlStateNormal];
AFPhotoEditorController *editorController = [[AFPhotoEditorController alloc] initWithImage:imageToEdit];
[editorController setDelegate:self];
[self presentViewController:editorController animated:YES completion:nil];
}
Or you would need to make a custom UIButton that has an extra property for the associated image, and then just access the image through the button in the selector:
- (void)displayEditorForImage:(UIButton*)sender {
if([sender isKindOfClass:[YourCustomButtonClass class]]) {
UIImage* imageToEdit = ((YourCustomButtonClass*)sender).customImageProperty;
AFPhotoEditorController *editorController = [[AFPhotoEditorController alloc] initWithImage:imageToEdit];
[editorController setDelegate:self];
[self presentViewController:editorController animated:YES completion:nil];
}
}
Edit:
You seem to be confused as to how to make a UIButton call a method on when it is tapped. You need to add the object which defines the method as the button's target (in this case self), add the method as the selector, and to called the method when the button is tapped use the UIControlEventTouchUpInside. So your code would be:
[editButton addTarget:self action:#selector(displayEditorForImage:) forControlEvents:UIControlEventTouchUpInside];