LayoutSnapshotProtocol
public protocol LayoutSnapshotProtocolDefines frame of layout block, and child blocks
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                  Frame of layout block represented as snapshot DeclarationSwift var snapshotFrame: CGRect { get }
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                  Snapshots of child layout blocks DeclarationSwift var childSnapshots: [LayoutSnapshotProtocol] { get }
 LayoutSnapshotProtocol Protocol Reference
        LayoutSnapshotProtocol Protocol Reference