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scrolling automatically to a particular item with scrollview reader

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talksik
2021-12-16 16:44:53 -08:00
parent 595e49983a
commit 23e1368af4
1 changed files with 57 additions and 50 deletions
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nirvana-ios/v2/InnerCircle/InnerCircleView.swift
+57 -50
View File
@@ -66,6 +66,7 @@ struct InnerCircleView: View {
private static let spacingBetweenColumns: CGFloat = 16
private static let spacingBetweenRows: CGFloat = 16
private static let totalColumns: Int = 10
private var numberOfItems: Int = 59
let frameSize: CGPoint = CGPoint(x: UIScreen.main.bounds.size.width*0.5,y: UIScreen.main.bounds.size.height*0.5)
@@ -87,59 +88,65 @@ struct InnerCircleView: View {
// .frame(maxWidth: .infinity)
// .blur(radius: 8)
ScrollView([.horizontal, .vertical], showsIndicators: false) {
LazyVGrid(
columns: gridItems,
alignment: .center,
spacing: Self.spacingBetweenRows
) {
ForEach(1..<60) { value in
GeometryReader {gridProxy in
let posRelToGrid = gridProxy.frame(in: .global) // relative to the entire lazygrid
Image("Artboards_Diversity_Avatars_by_Netguru-\(value)")
.resizable()
.scaledToFit()
.background(Color.white.opacity(0.5))
.cornerRadius(100)
.shadow(color: Color.black.opacity(0.2), radius: 10, x: 0, y: 20)
.scaleEffect(
scale(
x: isEvenRow(value) ? gridProxy.frame(in: .global).midX + gridProxy.size.width/2 :
gridProxy.frame(in: .global).midX,
y: gridProxy.frame(in: .global).midY,
value: value%43
ScrollViewReader {scrollReaderValue in
ScrollView([.horizontal, .vertical], showsIndicators: false) {
LazyVGrid(
columns: gridItems,
alignment: .center,
spacing: Self.spacingBetweenRows
) {
ForEach(1..<60) { value in
GeometryReader {gridProxy in
let posRelToGrid = gridProxy.frame(in: .global) // relative to the entire lazygrid
Image("Artboards_Diversity_Avatars_by_Netguru-\(value)")
.resizable()
.scaledToFit()
.background(Color.white.opacity(0.5))
.cornerRadius(100)
.shadow(color: Color.black.opacity(0.2), radius: 10, x: 0, y: 20)
// .scaleEffect(
// scale(
// x: isEvenRow(value) ? gridProxy.frame(in: .global).midX + gridProxy.size.width/2 :
// gridProxy.frame(in: .global).midX,
// y: gridProxy.frame(in: .global).midY,
// value: value%43
// )
// )
.offset(
x: honeycombOffSetX(value),
y: 0
)
)
.offset(
x: honeycombOffSetX(value),
y: 0
)
.onTapGesture {
self.selectedUserIndex = value
print("the selected item is: \(value)")
let rowNumber = value / Self.totalColumns // 10 / 10
print("the rownumber is: \(rowNumber)")
// make every even row have the honeycomb offset
if rowNumber % 2 == 0 {
print("the offset is \(Self.size / 2 + Self.spacingBetweenColumns / 2 )") // account for the column spacing from before
} else {
print("there is no offset")
.onTapGesture {
self.selectedUserIndex = value
print("the selected item is: \(value)")
let rowNumber = value / Self.totalColumns // 10 / 10
print("the rownumber is: \(rowNumber)")
// make every even row have the honeycomb offset
if rowNumber % 2 == 0 {
print("the offset is \(Self.size / 2 + Self.spacingBetweenColumns / 2 )") // account for the column spacing from before
} else {
print("there is no offset")
}
}
}
.animation(Animation.spring(), value: selectedUserIndex)
.animation(Animation.spring(), value: selectedUserIndex)
} // geometry reader
.id(value) // id for scrollviewreader
.frame(height: Self.size)
}
.frame(height: Self.size)
}
} // lazyvgrid
.padding(.trailing, Self.size / 2 + Self.spacingBetweenColumns / 2)
} // scrollview
} // lazyvgrid
.padding(.trailing, Self.size / 2 + Self.spacingBetweenColumns / 2)
}// scrollview
.onAppear {
scrollReaderValue.scrollTo(self.numberOfItems / 2)
}
} // scrollview reader
// navigation/footer