Have Outlet of many Button iOS

Question

I have a Calculator app. if a user press equal I want to change the background color of all my button(digit 1 to 9) should i have an outlet for each button(each button represent a digit) or there is a way to have one outlet that covers all buttons ?

possible duplicate of [How can I use IBOutletCollection to connect multiple UIImageViews to the same outlet?](http://stackoverflow.com/questions/15836930/how-can-i-use-iboutletcollection-to-connect-multiple-uiimageviews-to-the-same-ou) — Kevin, May 22 '15 at 03:03

score 7 · Answer 1 · answered May 22 '15 at 03:04

You want an IBOutletCollection.

In Objective-C, it would look like this:

@property (nonatomic, strong) IBOutletCollection(UIButton) NSArray* buttons;

In Swift:

@IBOutlet var buttons: [UIButton] = []

Then connect each of your buttons to the buttons outlet in Interface Builder, and you can iterate through each easily.

score 2 · Answer 2 · answered May 22 '15 at 03:07

You can loop all the elements in the UIView and change it programmatically using the code below

for view in self.view.subviews as [UIView] {
    if let btn = view as? UIButton {
         //do your changes here
         btn.backgroundColor = UIColor.redColor()
    }
}

score 0 · Answer 3 · answered May 22 '15 at 03:03

There is a way

control drag each button to the same outlet from the storyBoard. This should hook up each button to one outlet if I am remembering correctly, give it a try and then update your background colors to see if this works.

Of course yes, you can have an outlet for each button if you wish

Have Outlet of many Button iOS

3 Answers3