58 lines
1.6 KiB
Swift
58 lines
1.6 KiB
Swift
//
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// Copyright (c) 2017 Open Whisper Systems. All rights reserved.
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//
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import Foundation
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import UIKit
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class ImageCacheRecord: NSObject {
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var variations: [CGFloat: UIImage]
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init(variations: [CGFloat: UIImage]) {
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self.variations = variations
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}
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}
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/**
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* A two dimensional hash, allowing you to store variations under a single key.
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* This is useful because we generate multiple diameters of an image, but when we
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* want to clear out the images for a key we want to clear out *all* variations.
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*/
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@objc
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public class ImageCache: NSObject {
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let backingCache: NSCache<AnyObject, ImageCacheRecord>
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public override init() {
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self.backingCache = NSCache()
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}
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@objc
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public func image(forKey key: AnyObject, diameter: CGFloat) -> UIImage? {
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guard let record = backingCache.object(forKey: key) else {
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return nil
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}
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return record.variations[diameter]
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}
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@objc
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public func setImage(_ image: UIImage, forKey key: AnyObject, diameter: CGFloat) {
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if let existingRecord = backingCache.object(forKey: key) {
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existingRecord.variations[diameter] = image
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backingCache.setObject(existingRecord, forKey: key)
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} else {
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let newRecord = ImageCacheRecord(variations: [diameter: image])
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backingCache.setObject(newRecord, forKey: key)
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}
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}
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@objc
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public func removeAllImages() {
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backingCache.removeAllObjects()
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}
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@objc
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public func removeAllImages(forKey key: AnyObject) {
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backingCache.removeObject(forKey: key)
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}
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}
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