How to find the kind of subview object the view is containing in it?

Question

I am trying to find a specific class object added as Subview to a UIView, but I could not find anything.

Terrorize

Answer 1

for(UIView *aView in yourView.subviews){
    if([aView isKindOfClass:[YourClass class]]){
       //YourClass found!!
    }
}

Marabou

This doesn't solve when there are several same type Views, like UILabel in the subviews. try to add tag on the view, and use viewWithTag to access the subview later. – Quarterage

Answer 2

for example if you are finding an object of type UILabel class than it is shown as below.

for (UIView *subView in [weeklyViewA subviews]) {
            if ([subView isKindOfClass:[UILabel class]]) {
                NSLog(@"label class :: %@", [subView description]);
            }
        }

Zoniazoning

Answer 3

Swift answer

For this case, I think we can use Swift's first.where syntax, which is more efficient than filter.count, filter.isEmpty.

Because when we use filter, it will create a underlying array, thus not effective, imagine we have a large collection.

So just check if a view's subViews collection contains a specific kind of class, we can use this

let containsBannerViewKind = view.subviews.first(where: { $0 is BannerView }) != nil

which equivalent to: find me the first match to BannerView class in this view's subViews collection. So if this is true, we can carry out our further logic.

Reference: https://github.com/realm/SwiftLint/blob/master/Rules.md#first-where

Sinistrodextral

Answer 4

This is the swift version for checked solution :

Example for UITextField :

    for (_, view) in self.myView.subviews.enumerate(){
        if view.isKindOfClass(UITextField){
            //Here we go
        }
    }

Blanchette

Answer 5

in my opinion.isMemberOfClass:is better than isKindOfClass:,for example:

for (BadgeButton *button in self.subviews) {
    if ([button isMemberOfClass:[BadgeButton class]]) {
        button.selected = NO;
    }
}

Orlop

This does not provide an answer to the question. To critique or request clarification from an author, leave a comment below their post. - From Review – Pier

@JonRose Yeah,I had improved my answer. – Orlop

Answer 6

Swift 4.2: You can try below code:

let allsubviews = self.view.subviews
allsubviews.forEach { (view) in
   if view.isKind(of: UIScrollView.self){
       //current view is UIScrollview
   }
}

Alcahest