Associate UIVIew with UIButton in IBAction - ios

Question

I have a view controller (in a storyboard) with 6 buttons and 6 subviews. Those subviews are connected to IBOutlets and named like "mySubView1", "mySubView2" etc:
#property (weak, nonatomic) IBOutlet UIView *mySubView1;
#property (weak, nonatomic) IBOutlet UIView *mySubView2;
I want to animate the alpha value of the subview depending on which button was pressed. All 6 buttons are connected to the same IBAction (below) and each button has a tag (1 to 6).
How do I get the subview property name dynamically? eg, mySubView1 if sender.tag = 1 for example, in the animations block below:
- (IBAction)animateSubviews:(id)sender {
[UIView animateWithDuration:0.4
delay: 0.0
options: UIViewAnimationOptionCurveEaseOut
animations:^{
self.mySubView1.alpha = 1;
}
completion:^(BOOL finished){
}];
}
so what I need is something like : self.mySubView[sender tag].alpha = 1 sort of thing, but I'm stumped, so any advice much appreciated.
Many thanks

Answer 1

1) Assigning tags to subviews
Assign tags to your UIViews, for example the view that corresponds to button with tag 1 could have tag 101.
- (IBAction)animateSubviews:(id)sender {
[UIView animateWithDuration:0.4
delay: 0.0
options: UIViewAnimationOptionCurveEaseOut
animations:^{
UIView *subview = [self.view viewWithTag:((UIButton*)sender).tag + 100];
subview.alpha = 1;
}
completion:^(BOOL finished){
}];
}
2) Using dynamic selectors (which answers your original question)
You can use the method NSSelectorFromString which returns a SEL.
UIView *subview = [self performSelector:NSSelectorFromString([NSString stringWithFormat:#"mySubView%d", ((UIButton*)sender).tag])];

Answer 2

#property (strong, noatomatic) NSArray* arrayForSubViews;
if (!self.arrayForSubViews) {
self.arrayForSubViews = #[ self.mySubView1, self.mySubView2, ... ];
}
//get the second view
self.arrayForSubViews[1];