Arnaud Dorgans
34 lines
1.3 KiB
Swift
34 lines
1.3 KiB
Swift
//
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// CustomLayout.swift
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// InfiniteLayout_Example
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//
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// Created by Arnaud Dorgans on 28/12/2017.
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// Copyright © 2017 CocoaPods. All rights reserved.
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//
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import UIKit
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import InfiniteLayout
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class CustomLayout: InfiniteLayout {
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let minimumScale: CGFloat = 0.75
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let rangeRatio: CGFloat = 1
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override func layoutAttributesForElements(in rect: CGRect) -> [UICollectionViewLayoutAttributes]? {
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let attributes = super.layoutAttributesForElements(in: rect).flatMap {
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self.copyLayoutAttributes(from: $0)
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}
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guard let visibleRect = self.visibleCollectionViewRect() else {
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return attributes
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}
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let centeredOffset = CGPoint(x: visibleRect.midX, y: visibleRect.midY)
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for attributes in attributes ?? [] {
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let diff = self.scrollDirection == .horizontal ? centeredOffset.x - attributes.center.x : centeredOffset.y - attributes.center.y
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let scale = max(min(diff / (min(visibleRect.width, visibleRect.height) * rangeRatio), 1), -1)
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attributes.transform = attributes.transform.translatedBy(x: abs(scale * (visibleRect.width / 2)), y: 0)
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attributes.transform = attributes.transform.rotated(by: scale * (CGFloat.pi / 2))
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}
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return attributes
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}
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}
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