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+//
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+// ImageDataProviderCollectionViewController.swift
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+// Kingfisher
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+//
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+// Created by onevcat on 2018/12/08.
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+//
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+// Copyright (c) 2018 Wei Wang <onevcat@gmail.com>
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+//
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+// Permission is hereby granted, free of charge, to any person obtaining a copy
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+// of this software and associated documentation files (the "Software"), to deal
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+// in the Software without restriction, including without limitation the rights
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+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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+// copies of the Software, and to permit persons to whom the Software is
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+// furnished to do so, subject to the following conditions:
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+//
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+// The above copyright notice and this permission notice shall be included in
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+// all copies or substantial portions of the Software.
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+//
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+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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+// THE SOFTWARE.
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+
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+import UIKit
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+import Kingfisher
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+
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+private let reuseIdentifier = "ImageDataProviderCell"
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+
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+class ImageDataProviderCollectionViewController: UICollectionViewController {
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+
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+ let model: [(String, UIColor)] = [
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+ ("A", .red), ("B", .green), ("C", .blue), ("D", .yellow), ("赵", .purple), ("钱", .orange),
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+ ("孙", .black), ("李", .brown), ("ア", .darkGray), ("イ", .cyan), ("ウ", .magenta)]
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+
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+ override func viewDidLoad() {
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+ super.viewDidLoad()
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+ title = "Provider"
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+ setupOperationNavigationBar()
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+ }
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+
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+ override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
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+ return model.count
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+ }
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+
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+ override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
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+ let cell = collectionView.dequeueReusableCell(withReuseIdentifier: reuseIdentifier, for: indexPath) as! ImageCollectionViewCell
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+
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+ let pair = model[indexPath.row]
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+ let provider = UserNameLetterIconImageProvider(userNameFirstLetter: pair.0, backgroundColor: pair.1)
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+ cell.cellImageView.kf.setImage(with: provider, options:[.processor(RoundCornerImageProcessor(cornerRadius: 75))])
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+
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+ return cell
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+ }
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+}
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+
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+struct UserNameLetterIconImageProvider: ImageDataProvider {
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+ var cacheKey: String { return letter }
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+ let letter: String
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+ let color: UIColor
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+
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+ init(userNameFirstLetter: String, backgroundColor: UIColor) {
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+ letter = userNameFirstLetter
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+ color = backgroundColor
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+ }
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+
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+ func data(handler: @escaping (Result<Data, Error>) -> Void) {
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+ let letter = self.letter as NSString
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+ let rect = CGRect(x: 0, y: 0, width: 250, height: 250)
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+
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+ let format = UIGraphicsImageRendererFormat.default()
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+ format.scale = 1
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+
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+ let renderer = UIGraphicsImageRenderer(size: rect.size, format: format)
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+ let data = renderer.pngData { context in
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+ color.setFill()
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+ context.fill(rect)
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+
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+ let attributes = [
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+ NSAttributedString.Key.foregroundColor: UIColor.white,
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+ .font: UIFont.systemFont(ofSize: 200)
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+ ]
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+
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+ let textSize = letter.size(withAttributes: attributes)
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+ let textRect = CGRect(
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+ x: (rect.width - textSize.width) / 2,
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+ y: (rect.height - textSize.height) / 2,
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+ width: textSize.width,
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+ height: textSize.height)
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+ letter.draw(in: textRect, withAttributes: attributes)
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+ }
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+ handler(.success(data))
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+ }
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+}
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onevcat