40 lines
1.2 KiB
Swift
40 lines
1.2 KiB
Swift
import UIKit
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/// 图片缓存管理单例，负责图片的缓存、读取和清除
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class ImageCacheManager {
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static let shared = ImageCacheManager()
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private let cache = NSCache<NSString, UIImage>()
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// 私有初始化，确保单例
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private init() {
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// 可设置缓存上限（可选）
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cache.totalCostLimit = 1024 * 1024 * 100 // 100MB
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}
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/// 从缓存获取图片
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/// - Parameter url: 图片URL字符串
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/// - Returns: 缓存的图片（如果存在）
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func getImage(for url: String) -> UIImage? {
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return cache.object(forKey: url as NSString)
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}
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/// 保存图片到缓存
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/// - Parameters:
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/// - image: 要缓存的图片
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/// - url: 图片URL字符串（作为缓存键）
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func saveImage(_ image: UIImage, for url: String) {
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cache.setObject(image, forKey: url as NSString)
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}
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/// 清除指定URL的图片缓存
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/// - Parameter url: 图片URL字符串
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func removeImage(for url: String) {
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cache.removeObject(forKey: url as NSString)
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}
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/// 清除所有图片缓存
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func clearAllCache() {
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cache.removeAllObjects()
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}
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}
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