Introspector in iOS 14 not working for ScrollView...

[luap2703]

First of all the specs: iOS 14, Xcode 12.2 beta and Catalina running on my Mac.

I tried to add a pulltorefresh function to a ScrollView in Swiftui but it doesnt show up. Actually the whohle introspect is never called. I tried a few times and it actually only works if I change it to List, but not with ScrollView like it is shown in the Github example. As I defo need it for ScrollView I need your help. Cheers...

So this one actually works:

List {
ForEach(0..<100)
{ _ in
Text("hello")
}
}
.introspectScrollView { scrollView in
print("Test")
scrollView.refreshControl = UIRefreshControl()
}

while this does not:

ScrollView {
ForEach(0..<100)
{ _ in
Text("hello")
}
}
.introspectScrollView { scrollView in
print("Test")
scrollView.refreshControl = UIRefreshControl()
}

[OmegaWulf]

I'm seeing the same problem. The introspectScrollView is not being called at all.

[rivera-ernesto]

The problems seems to be that the function:

public static func findAncestor<AnyViewType: PlatformView>(ofType type: AnyViewType.Type, from entry: PlatformView) -> AnyViewType? {
    var superview = entry.superview
    while let s = superview {
        if let typed = s as? AnyViewType { // This won't match a UIScrollView in iOS 14
            return typed
        }
        superview = s.superview
    }
    return nil
}

returns nil as the view that should be recognized is not a UIScrollView but a _TtGC7SwiftUI16PlatformViewHostGVS_P13$7fff56302ab832PlatformViewRepresentableAdaptorGV9FileCloud22UIKitIntrospectionViewCSo12UIScrollView___.

Where I have manually added the project sources to workaround my app having a deployment target < iOS 13.

Some debugger testing:

$ po entry
<FileCloud.IntrospectionUIView: 0x7f8181156680; frame = (0 0; 10 10); hidden = YES; userInteractionEnabled = NO; layer = <CALayer: 0x600001004ca0>>

$ po entry.superview
▿ Optional<UIView>
  ▿ some : <_TtGC7SwiftUI16PlatformViewHostGVS_P13$7fff56302ab832PlatformViewRepresentableAdaptorGV9FileCloud22UIKitIntrospectionViewCSo12UIScrollView___: 0x7f8181161500; frame = (202 547.333; 10 10); anchorPoint = (0, 0); tintColor = UIExtendedSRGBColorSpace 0.517647 0 0.329412 1; layer = <CALayer: 0x600001005180>>

$ po entry.superview is UIScrollView
false

$ po entry.superview is UIView
true

My SwiftUI code:

ScrollView {
    VStack {
        // ...
    }
}
.introspectScrollView {
    self.scrollViewHelper.scrollView = $0
}

[lucastimeless]

Created a PR with a potential fix: #56

[luap2703]

The #56 fix works fine for as far as I can see!

But I'm facing some other issue by adding a UIRefreshControl to the ScrollView. it has some uncommon behavior by not really showing the refresh animation but disappearing when it is pulled. I also tried it with a List but that seems to only appear on the introspected ScrollView. Am I missing something here or is it a bug? I think the "normal" behavior would be to show the refresh animation forever as I'm not giving it a target. A basic example where it happens for me is:

struct TEST: View {
    var body: some View {
           ScrollView {
           Text("Message 1")
           Text("Message 2")
           Text("Message 3")
            }
           .introspectScrollView() { scrollView in
               print("is now working with fix #56 (so definitly fires at all)")
               scrollView.refreshControl = UIRefreshControl()
           }
    }
}

[Mactacs]

Hi guys! How did you fix this issue? I also experienced this bug and can't figure out how to solve it. Hoping for a quick response. Thank you

[ImTheSquid]

@Mactacs Due to the lack of quick updates to this repo, I have just downloaded the codebase mentioned in #56 and put it in a folder in my project. After that I continued importing the library as normal (while making sure to remove any previous SPM references).

[maschoffjake]

Also seeing the same behavior as Paulo has pointed out. The animation disappears once the UIRefreshControl has been enabled.

[ldiqual]

Fixed in master, see 6ddd059. Props to @lucastimeless for their work on #56 !

[Luur]

Hi @Paulo2703 @maschoffjake @ldiqual Did you find a way how to figure out the issue you described? I'm facing this issue too. The animation disappears once the UIRefreshControl has been enabled.

[maschoffjake]

Sadly not :/

…

On Thu, Nov 19, 2020 at 7:16 AM Svyat Zubyak ***@***.***> wrote: Hi @Paulo2703 <https://github.com/paulo2703> @maschoffjake <https://github.com/maschoffjake> Did you find a way how to figure out the issue you described? I'm facing this issue too. The animation disappears once the UIRefreshControl has been enabled. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#55 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ACDUC3LAPPECA6M64S6FY3LSQUSCNANCNFSM4RT5MKDA> .

[luap2703]

Hey, so i have found kind of a sneakaround by putting the scrollview into a List, where the introspect uirefreshcontrol actually works.