Hello. I am developing an application using Swift 6 and SwiftUI.
I have custom implemented a BottomSheet that animates from bottom to top, and I attempted to achieve this animation by changing the alignmentGuide like this.
ZStack(alignment: .bottom) {
dimView
.opacity(isVisible ? 1 : 0)
.transaction { transaction in
transaction.animation = .easeInOut(duration: 0.35)
}
bottomSheetView
.alignmentGuide(VerticalAlignment.bottom) { dimension in
// compile error occur because isVisible property is state of MainActor isolated View!
isVisible ? dimension[.bottom] : dimension[.top]
}
}
There were no issues in Swift 5, but now I am encountering compile errors because the computeValue closure of the alignmentGuide is not isolated to the MainActor, preventing me from calling view state values or functions.
So I am curious if there are any plans to isolate this closure to the MainActor. From my observation, this closure is always called on the main thread.
Thank you.
HoJongE
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution
From
South Korea
Post
Replies
Boosts
Views
Activity
Hello. Recently, while studying alignmentGuide, I had questions about it behaving differently from the documentation when setting multiple alignment guides.
For example, the document states that only the alignmentGuide modifier with a first parameter matching the container's alignment will function.
Therefore, I thought that writing the Swift code below would result in the yellow color's center alignment being aligned with the HStack's bottom alignment.
struct TestView: View {
var body: some View {
HStack(alignment: .bottom) {
Color.yellow
.frame(height: 50)
.alignmentGuide(VerticalAlignment.center) { dim in
dim[.top]
}
.alignmentGuide(VerticalAlignment.top) { dim in
dim[.bottom]
}
.alignmentGuide(VerticalAlignment.bottom) { dim in
dim[VerticalAlignment.center]
}
Text("Hello, world")
}
.border(.green)
}
}
Expect
However, in reality, I observed that the top of the yellow color aligns with the HStack's bottom alignment. From this, I inferred that the 3rd alignmentGuide is applied first, and this also causes the first alignmentGuide to work, which makes me curious about how this is possible. If I leave only the 3rd alignmentGuide, it behaves as I expected.
Real Behavior
Could anybody help me to figure it out this behavior? Thank you