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206017c01f
URLPreviewCacheData becomes URLPreviewData in the model with a class name of URLPreviewDataMO ClosedURLData becomes URLPreviewUserData in the model with a class name of URLPreviewUserDataMO
45 lines
1.5 KiB
Swift
45 lines
1.5 KiB
Swift
//
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// Copyright 2021 New Vector Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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import CoreData
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/// A `ValueTransformer` for ``URLPreviewCacheData``'s `image` field.
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/// This class transforms between `UIImage` and it's `pngData()` representation.
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class URLPreviewImageTransformer: ValueTransformer {
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override class func transformedValueClass() -> AnyClass {
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UIImage.self
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}
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override class func allowsReverseTransformation() -> Bool {
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true
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}
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/// Transforms a `UIImage` into it's `pngData()` representation.
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override func transformedValue(_ value: Any?) -> Any? {
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guard let image = value as? UIImage else { return nil }
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return image.pngData()
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}
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/// Transforms `Data` into a `UIImage`
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override func reverseTransformedValue(_ value: Any?) -> Any? {
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guard let data = value as? Data else { return nil }
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return UIImage(data: data)
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}
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}
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extension NSValueTransformerName {
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static let urlPreviewImageTransformer = NSValueTransformerName("URLPreviewImageTransformer")
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}
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